NO.5 ENGINE STALLS-AFTER START/AT IDLE [SKYACTIV-G 1.3, SKYACTIV-G 1.5]

id0103q1801100


Engine Type

Item

Reference
PCM (200 pin type)
(See PCM (200 Pin Type).)
PCM (186 pin type)
(See PCM (186 Pin Type).)


PCM (200 Pin Type)

5

ENGINE STALLS-AFTER START/AT IDLE
DESCRIPTION
•  Engine stops unexpectedly at idle, after start, or both.
POSSIBLE CAUSE
•  Engine overheating
•  PCM DTC is stored
•  Erratic signal to PCM
―  APP sensor or related circuit malfunction
―  ECT sensor or related circuit malfunction
―  MAF sensor or related circuit malfunction
―  MAP sensor or related circuit malfunction
―  A/F sensor or related circuit malfunction
―  HO2S or related circuit malfunction
―  Improper air/fuel mixture ratio control
•  Improper operation of A/C system
•  Improper operation of drive-by-wire control system
•  Purge solenoid valve malfunction
•  Open circuit in MAF sensor ground circuit
•  Intermittent open circuit in PCM ground circuit
•  Poor fuel quality
•  Air leakage from intake-air system
•  Vacuum leakage
•  Intake-air system restriction
•  Electrical connector disconnected
•  No battery power supply to PCM or poor ground
•  Fuel leakage
•  No signal from CKP sensor
―  Loose installation
―  Damaged trigger wheel (crankshaft pulley)
―  Open or short circuit in related wiring harness
•  Erratic signal from CMP sensor
―  Loose installation
―  Damaged trigger wheel (intake camshaft)
―  Damaged trigger wheel (exhaust camshaft) (4-2-1 exhaust system)
―  Open or short circuit in related wiring harness
•  Inadequate fuel pressure (high or low pressure side)
―  Open or short circuit in the fuel pump (low-side) body or related wiring harness
―  Fuel pressure sensor or related circuit malfunction
―  Fuel pump (low-side) body mechanical malfunction
―  High pressure fuel pump malfunction
―  Spill valve control solenoid valve control circuit malfunction (damage to driver in PCM caused by short circuit to ground system)
―  Spill valve control solenoid valve malfunction (built-into high pressure fuel pump)
―  Relief valve (built-into high pressure fuel pump) malfunction
―  Fuel line restriction
―  Fuel filter clogged (built-into fuel pump unit)
―  Fuel pump unit malfunction
•  Fuel injector malfunction
•  Incorrect fuel injection timing
•  Improper operation of electric variable valve timing control system (4-2-1 exhaust system)
―  Electric variable valve timing driver malfunction
―  Electric variable valve timing motor malfunction
―  Electric variable valve timing actuator malfunction
•  Improper operation of hydraulic variable valve timing control system
•  Ignition system malfunction
•  Ignition coil malfunction
•  Low engine compression
•  Improper intake valve timing
•  Improper exhaust valve timing (4-2-1 exhaust system)
•  Exhaust system and/or TWC restricted or clogged
•  PCV valve malfunction
•  Injector driver (built-into PCM) malfunction
POSSIBLE CAUSE
Warning
The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services:
•  Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel.
•  Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injury or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete “BEFORE SERVICE PRECAUTION” and “AFTER SERVICE PRECAUTION” described in this manual. (See BEFORE SERVICE PRECAUTION [SKYACTIV-G 1.3, SKYACTIV-G 1.5].) (See AFTER SERVICE PRECAUTION [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
Caution
•  Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

Diagnostic Procedure

STEP

INSPECTION

RESULTS

ACTION
1
VERIFY TIMING OCCURRING MALFUNCTION
•  Verify the symptom.
•  Does the malfunction symptom occur just after the engine is started?
Yes
Perform the symptom troubleshooting “NO.4 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK”.
(See NO.4 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
No
Go to the next step.
2
VERIFY IF MALFUNCTION INCLUDES ROUGH IDLING
•  Verify the symptom.
•  Does the engine idle rough?
Yes
Perform the symptom troubleshooting “NO.8 ENGINE RUNS ROUGH/ROLLING IDLE”.
(See NO.8 ENGINE RUNS ROUGH/ROLLING IDLE [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
No
Go to the next step.
3
VERIFY IF MALFUNCTION CAUSE IS OVERHEATING
Caution
•  While performing this step, always operate the vehicle in a safe and lawful manner.
•  When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later.
•  Access the ECT PID using the M-MDS.
•  Is the ECT PID value less than 116 °C {241 °F} during driving?
Yes
Go to the next step.
No
The cause of this concern could be from the cooling system overheating.
•  Perform the symptom troubleshooting “NO.17 COOLING SYSTEM CONCERNS-OVERHEATING”.
4
VERIFY PCM DTC
•  Retrieve any DTCs using the M-MDS.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [PCM (SKYACTIV-G 1.3, SKYACTIV-G 1.5)].)
No
Go to the next step.
5
VERIFY CURRENT INPUT SIGNAL STATUS
Caution
•  While performing this step, always operate the vehicle in a safe and lawful manner.
•  When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later.
•  Access the following PIDs using the M-MDS:
―  APP1
―  APP2
―  ECT
―  MAF
―  MAP
―  MAP_V
―  O2S11
―  O2S12
―  SHRTFT1
―  LONGFT1
•  Do the PIDs indicate the correct values under the trouble condition?
Yes
Go to the next step.
No
APP1, APP2 PIDs are not as specified:
•  Inspect the APP sensor.
ECT PID is not as specified:
•  Inspect the ECT sensor No.1.
MAF PID is not as specified:
•  Inspect the MAF sensor.
MAP, MAP_V PIDs are not as specified:
•  Inspect the MAP sensor.
O2S11, SHRTFT1, LONGFT1 PIDs are not as specified:
•  Inspect the A/F sensor.
O2S12 PID is not as specified:
•  Inspect the HO2S.
Repair or replace the malfunctioning part according to the inspection results.
•  If the malfunction remains:
―  Perform the “INTERMITTENT CONCERN TROUBLESHOOTING” procedure.
6
INSPECT MAIN RELAY CIRCUIT FOR SHORT TO GROUND
•  Main relay is removed.
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
―  Main relay terminal C
―  Main relay terminal E
•  Is there continuity?
Yes
Disconnect the PCM connector and inspect the wiring harness for short to ground.
•  If the short to ground circuit could be detected in the wiring harness:
―  Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  Main relay terminal C—PCM terminal 1CK
•  Main relay terminal C—PCM terminal 2S
•  Main relay terminal C—PCM terminal 2T
•  Main relay terminal E—PCM terminal 2K
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
•  If the short to ground circuit could not be detected in the wiring harness:
―  Replace the PCM (short to ground in the PCM internal circuit).
Go to Step 31.
No
Go to the next step.
7
INSPECT PCM CONNECTOR CONDITION
•  Disconnect the PCM connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 31.
No
Go to the next step.
8
INSPECT MAIN RELAY CIRCUIT FOR OPEN CIRCUIT
•  Main relay is removed.
•  Verify that the PCM connector is disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side):
―  Main relay terminal C—PCM terminal 1CK
―  Main relay terminal C—PCM terminal 2S
―  Main relay terminal C—PCM terminal 2T
―  Main relay terminal E—PCM terminal 2K
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  Main relay terminal C—PCM terminal 1CK
•  Main relay terminal C—PCM terminal 2S
•  Main relay terminal C—PCM terminal 2T
•  Main relay terminal E—PCM terminal 2K
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 31.
9
INSPECT A/C CUT-OFF CONTROL SYSTEM OPERATION
•  Perform the A/C Cut-off Control System Inspection.
•  Does the A/C cut-off operation work properly?
Yes
Go to the next step.
No
Perform the symptom troubleshooting "NO.23 A/C DOES NOT WORK SUFFICIENTLY" and "NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY".
(See NO.23 A/C DOES NOT WORK SUFFICIENTLY [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
(See NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
10
DETERMINE IF MALFUNCTION CAUSE IS DRIVE-BY-WIRE CONTROL SYSTEM OR OTHER
•  Will the engine run smoothly at part throttle?
Yes
Go to Step 12.
No
Go to the next step.
11
INSPECT DRIVE-BY-WIRE CONTROL SYSTEM OPERATION
•  Perform the Electronic Control Throttle Operation Inspection.
•  Does the drive-by-wire control system work properly?
Yes
Visually inspect the throttle body (damage/scratching).
•  If there is any malfunction:
―  Repair or replace the malfunctioning part according to the inspection results.
•  If there is no malfunction:
―  Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results.
12
INSPECT PURGE CONTROL SYSTEM OPERATION
•  Perform the Purge Control System Inspection.
•  Does the purge solenoid valve work properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results.
13
INSPECT MAF SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT
•  Inspect the MAF sensor for the following:
―  MAF sensor terminal B voltage (ground circuit)
•  Is there any malfunction?
Yes
Repair or replace the suspected wiring harness.
No
Go to the next step.
14
INSPECT PCM FOR POOR GROUND
•  Verify the PCM ground point condition.
•  Is there any ground point loose or lifting in the PCM?
Yes
Repair the ground point.
No
Go to the next step.
15
INSPECT RELATED PART CONDITION
•  Inspect the following:
―  Fuel quality (proper octane, contamination, winter/summer blend)
―  Intake-air system leakage or restriction
―  Electrical connectors
―  Poor connection for PCM ground and body ground
―  Fuel leakage
―  Vacuum leakage
―  CKP sensor and intake CMP sensor
•  Installation condition
•  Damaged trigger wheel (intake camshaft)
―  Exhaust CMP sensor (4-2-1 exhaust system)
•  Installation condition
•  Damaged trigger wheel (exhaust camshaft)
•  Is there any malfunction?
Yes
Service if necessary.
•  Repeat this step.
No
Go to the next step.
16
INSPECT FUEL PRESSURE (HIGH-SIDE)
•  Start the engine and warm it up completely.
•  Access the FUEL_PRES PID using the M-MDS at idle.
•  Is the FUEL_PRES PID value approx. 3 MPa {31 kgf/cm2, 435 psi}?
Yes
Go to Step 20.
No
Lower than 3 MPa {31 kgf/cm2, 435 psi}:
•  Inspect the following:
―  Fuel leakage at the fuel line and fuel injector
―  Fuel pump
•  Perform the Fuel Pump (Low-pressure Side) Operation Inspection.
―  Fuel pressure sensor
―  High pressure fuel pump
•  If there is any malfunction:
―  Repair or replace the malfunctioning part according to the inspection results.
•  If there is no malfunction:
―  Go to Step 19.
Higher than 3 MPa {31 kgf/cm2, 435 psi}:
•  Go to the next step.
17
DETERMINE IF MALFUNCTION CAUSE IS FUEL PRESSURE SENSOR OR HIGH PRESSURE FUEL PUMP
•  Is the vehicle acceleration performance normal?
Yes
Go to the next step.
No
Go to Step 19.
18
INSPECT FUEL PRESSURE SENSOR
•  Inspect the fuel pressure sensor.
•  Is there any malfunction?
Yes
Replace the fuel distributor.
(See FUEL INJECTOR REMOVAL/INSTALLATION [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
No
Go to Step 20.
19
INSPECT SPILL VALVE CONTROL SOLENOID VALVE CONTROL CIRCUIT FOR SHORT TO GROUND
•  Switch the ignition off.
•  Disconnect the high pressure fuel pump and PCM connectors.
•  Inspect for continuity between high pressure fuel pump terminal A (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Refer to the wiring diagram and verify whether or not there is a common connector between high pressure fuel pump terminal A and PCM terminal 1EE.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
If the malfunction remains:
•  Replace the PCM. (damage to driver in PCM)
No
Replace the high pressure fuel pump.
(See HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
20
INSPECT FUEL PRESSURE (LOW-SIDE)
•  Connect the fuel pressure gauge between fuel pump and high pressure fuel pump.
•  Measure the low side fuel pressure.
•  Is the low side fuel pressure within specification?
Specification:
•  425—505 kPa {4.34—5.14 kgf/cm2, 61.7—73.2 psi}
Yes
Go to the next step.
No
Inspect the following:
•  Fuel line restriction
•  Fuel filter clogged
―  If there is any malfunction:
•  Repair or replace the malfunctioning part according to the inspection results.
―  If there is no malfunction:
•  Replace the fuel pump unit.
21
INSPECT FUEL INJECTOR OPERATION
•  Perform the Fuel Injector Operation Inspection.
•  Do the fuel injectors operate properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results.
22
INSPECT ENGINE COMPRESSION
•  Measure the compression pressure for each cylinder.
•  Are compression pressures within specification?
Yes
Go to Step 28.
No
4-2-1 exhaust system:
•  Go to the next step.
4-1 exhaust system:
•  Go to Step 26.
23
INSPECT ELECTRIC VARIABLE VALVE TIMING DRIVER
•  Inspect the electric variable valve timing driver.
•  Is there any malfunction?
Yes
Replace the electric variable valve timing motor/driver.
(See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
No
Go to the next step.
24
INSPECT ELECTRIC VARIABLE VALVE TIMING MOTOR
•  Inspect the electric variable valve timing motor.
•  Is there any malfunction?
Yes
Replace the electric variable valve timing motor/driver.
(See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
No
Go to the next step.
25
INSPECT ELECTRIC VARIABLE VALVE TIMING ACTUATOR
•  Inspect the electric variable valve timing actuator.
•  Is there any malfunction?
Yes
Replace the electric variable valve timing actuator.
(See ELECTRIC VARIABLE VALVE TIMING ACTUATOR, HYDRAULIC VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
No
Go to the next step.
26
INSPECT HYDRAULIC VARIABLE VALVE TIMING CONTROL SYSTEM OPERATION
•  Perform the Hydraulic Variable Valve Timing Control System Operation Inspection.
•  Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
27
INSPECT FOR MALFUNCTION DUE TO DEVIATED VALVE TIMING
•  Inspect the valve timing (timing chain installation condition).
•  Is the valve timing normal?
Yes
Inspect for the following engine internal parts:
•  Cylinder
•  Piston ring
•  Intake valve
•  Exhaust valve
•  Such as cylinder head gasket
―  If there is any malfunction:
•  Repair or replace the malfunctioning part according to the inspection results.
No
Adjust the valve timing to the correct timing.
28
INSPECT IGNITION SYSTEM OPERATION
•  Perform the Spark Test.
•  Is a strong blue spark visible at each cylinder?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results.
29
INSPECT EXHAUST SYSTEM FOR RESTRICTION
•  Inspect for restriction in the exhaust system and the TWC.
•  Is there any restriction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
30
INSPECT IF MALFUNCTION CAUSE IS PCV VALVE OR INJECTOR DRIVER (PCM INTEGRATED)
•  Inspect the PCV valve.
•  Is there any malfunction?
Yes
Replace the PCV valve.
(See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
No
Injector driver malfunction.
•  Replace the PCM.
If the problem remains, overhaul the engine.
31
Verify the test results.
•  If normal, return to the diagnostic index to service any additional symptoms.
•  If a malfunction remains, inspect the related Service Information and perform the repair or diagnosis.
―  If the vehicle is repaired, troubleshooting is completed.
―  If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM.


PCM (186 Pin Type)

5

ENGINE STALLS-AFTER START/AT IDLE
DESCRIPTION
•  Engine stops unexpectedly at idle, after start, or both.
POSSIBLE CAUSE
•  Engine overheating
•  PCM DTC is stored
•  Erratic signal to PCM
―  APP sensor or related circuit malfunction
―  ECT sensor or related circuit malfunction
―  MAF sensor or related circuit malfunction
―  MAP sensor or related circuit malfunction
―  A/F sensor or related circuit malfunction
―  HO2S or related circuit malfunction
―  Improper air/fuel mixture ratio control
•  Improper operation of A/C system
•  Improper operation of drive-by-wire control system
•  Purge solenoid valve malfunction
•  Open circuit in MAF sensor ground circuit
•  Intermittent open circuit in PCM ground circuit
•  Poor fuel quality
•  Air leakage from intake-air system
•  Vacuum leakage
•  Intake-air system restriction
•  Electrical connector disconnected
•  No battery power supply to PCM or poor ground
•  Fuel leakage
•  No signal from CKP sensor
―  Loose installation
―  Damaged trigger wheel (crankshaft pulley)
―  Open or short circuit in related wiring harness
•  Erratic signal from CMP sensor
―  Loose installation
―  Damaged trigger wheel (intake camshaft)
―  Damaged trigger wheel (exhaust camshaft) (with coolant control valve)
―  Open or short circuit in related wiring harness
•  Inadequate fuel pressure (high or low pressure side)
―  Open or short circuit in the fuel pump (low-side) body or related wiring harness
―  Fuel pressure sensor or related circuit malfunction
―  Fuel pump (low-side) body mechanical malfunction
―  High pressure fuel pump malfunction
―  Spill valve control solenoid valve control circuit malfunction (damage to driver in PCM caused by short circuit to ground system)
―  Spill valve control solenoid valve malfunction (built-into high pressure fuel pump)
―  Relief valve (built-into high pressure fuel pump) malfunction
―  Fuel line restriction
―  Fuel filter clogged (built-into fuel pump unit)
―  Fuel pump unit malfunction
•  Fuel injector malfunction
•  Incorrect fuel injection timing
•  Improper operation of electric variable valve timing control system (with coolant control valve)
―  Electric variable valve timing driver malfunction
―  Electric variable valve timing motor malfunction
―  Electric variable valve timing actuator malfunction
•  Improper operation of hydraulic variable valve timing control system
•  Ignition system malfunction
•  Ignition coil malfunction
•  Low engine compression
•  Improper intake valve timing
•  Improper exhaust valve timing (with coolant control valve)
•  Exhaust system and/or TWC restricted or clogged
•  PCV valve malfunction
•  Injector driver (built-into PCM) malfunction
POSSIBLE CAUSE
Warning
The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services:
•  Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel.
•  Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injury or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete “BEFORE SERVICE PRECAUTION” and “AFTER SERVICE PRECAUTION” described in this manual. (See BEFORE SERVICE PRECAUTION [SKYACTIV-G 1.3, SKYACTIV-G 1.5].) (See AFTER SERVICE PRECAUTION [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
Caution
•  Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

Diagnostic Procedure

STEP

INSPECTION

RESULTS

ACTION
1
VERIFY TIMING OCCURRING MALFUNCTION
•  Verify the symptom.
•  Does the malfunction symptom occur just after the engine is started?
Yes
Perform the symptom troubleshooting “NO.4 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK”.
(See NO.4 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
No
Go to the next step.
2
VERIFY IF MALFUNCTION INCLUDES ROUGH IDLING
•  Verify the symptom.
•  Does the engine idle rough?
Yes
Perform the symptom troubleshooting “NO.8 ENGINE RUNS ROUGH/ROLLING IDLE”.
(See NO.8 ENGINE RUNS ROUGH/ROLLING IDLE [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
No
Go to the next step.
3
VERIFY IF MALFUNCTION CAUSE IS OVERHEATING
Caution
•  While performing this step, always operate the vehicle in a safe and lawful manner.
•  When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later.
•  Access the ECT PID using the M-MDS.
•  Is the ECT PID value less than 116 °C {241 °F} during driving?
Yes
Go to the next step.
No
The cause of this concern could be from the cooling system overheating.
•  Perform the symptom troubleshooting “NO.17 COOLING SYSTEM CONCERNS-OVERHEATING”.
4
VERIFY PCM DTC
•  Retrieve any DTCs using the M-MDS.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [PCM (SKYACTIV-G 1.3, SKYACTIV-G 1.5)].)
No
Go to the next step.
5
VERIFY CURRENT INPUT SIGNAL STATUS
Caution
•  While performing this step, always operate the vehicle in a safe and lawful manner.
•  When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later.
•  Access the following PIDs using the M-MDS:
―  APP1
―  APP2
―  ECT
―  ECT2
―  ECT2_V
―  MAF
―  MAP
―  MAP_V
―  O2S11
―  O2S12
―  SHRTFT1
―  LONGFT1
•  Do the PIDs indicate the correct values under the trouble condition?
Yes
Go to the next step.
No
APP1, APP2 PIDs are not as specified:
•  Inspect the APP sensor.
ECT PID is not as specified:
•  Inspect the ECT sensor No.1.
ECT2, ECT2_V PIDs are not as specified:
•  Inspect the ECT sensor No.2.
MAF PID is not as specified:
•  Inspect the MAF sensor.
MAP, MAP_V PIDs are not as specified:
•  Inspect the MAP sensor.
O2S11, SHRTFT1, LONGFT1 PIDs are not as specified:
•  Inspect the A/F sensor.
O2S12 PID is not as specified:
•  Inspect the HO2S.
Repair or replace the malfunctioning part according to the inspection results.
•  If the malfunction remains:
―  Perform the “INTERMITTENT CONCERN TROUBLESHOOTING” procedure.
6
INSPECT MAIN RELAY CIRCUIT FOR SHORT TO GROUND
•  Main relay is removed.
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
―  Main relay terminal C
―  Main relay terminal E
•  Is there continuity?
Yes
Disconnect the PCM connector and inspect the wiring harness for short to ground.
•  If the short to ground circuit could be detected in the wiring harness:
―  Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  Main relay terminal C—PCM terminal 2BO
•  Main relay terminal C—PCM terminal 2BR
•  Main relay terminal E—PCM terminal 2B
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
•  If the short to ground circuit could not be detected in the wiring harness:
―  Replace the PCM (short to ground in the PCM internal circuit).
Go to Step 31.
No
Go to the next step.
7
INSPECT PCM CONNECTOR CONDITION
•  Disconnect the PCM connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 31.
No
Go to the next step.
8
INSPECT MAIN RELAY CIRCUIT FOR OPEN CIRCUIT
•  Main relay is removed.
•  Verify that the PCM connector is disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side):
―  Main relay terminal C—PCM terminal 2BO
―  Main relay terminal C—PCM terminal 2BR
―  Main relay terminal E—PCM terminal 2B
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  Main relay terminal C—PCM terminal 2BO
•  Main relay terminal C—PCM terminal 2BR
•  Main relay terminal E—PCM terminal 2B
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 31.
9
INSPECT A/C CUT-OFF CONTROL SYSTEM OPERATION
•  Perform the A/C Cut-off Control System Inspection.
•  Does the A/C cut-off operation work properly?
Yes
Go to the next step.
No
Perform the symptom troubleshooting "NO.23 A/C DOES NOT WORK SUFFICIENTLY" and "NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY".
(See NO.23 A/C DOES NOT WORK SUFFICIENTLY [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
(See NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
10
DETERMINE IF MALFUNCTION CAUSE IS DRIVE-BY-WIRE CONTROL SYSTEM OR OTHER
•  Will the engine run smoothly at part throttle?
Yes
Go to Step 12.
No
Go to the next step.
11
INSPECT DRIVE-BY-WIRE CONTROL SYSTEM OPERATION
•  Perform the Electronic Control Throttle Operation Inspection.
•  Does the drive-by-wire control system work properly?
Yes
Visually inspect the throttle body (damage/scratching).
•  If there is any malfunction:
―  Repair or replace the malfunctioning part according to the inspection results.
•  If there is no malfunction:
―  Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results.
12
INSPECT PURGE CONTROL SYSTEM OPERATION
•  Perform the Purge Control System Inspection.
•  Does the purge solenoid valve work properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results.
13
INSPECT MAF SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT
•  Inspect the MAF sensor for the following:
―  MAF sensor terminal B voltage (ground circuit)
•  Is there any malfunction?
Yes
Repair or replace the suspected wiring harness.
No
Go to the next step.
14
INSPECT PCM FOR POOR GROUND
•  Verify the PCM ground point condition.
•  Is there any ground point loose or lifting in the PCM?
Yes
Repair the ground point.
No
Go to the next step.
15
INSPECT RELATED PART CONDITION
•  Inspect the following:
―  Fuel quality (proper octane, contamination, winter/summer blend)
―  Intake-air system leakage or restriction
―  Electrical connectors
―  Poor connection for PCM ground and body ground
―  Fuel leakage
―  Vacuum leakage
―  CKP sensor and intake CMP sensor
•  Installation condition
•  Damaged trigger wheel (intake camshaft)
―  Exhaust CMP sensor (with coolant control valve)
•  Installation condition
•  Damaged trigger wheel (exhaust camshaft)
•  Is there any malfunction?
Yes
Service if necessary.
•  Repeat this step.
No
Go to the next step.
16
INSPECT FUEL PRESSURE (HIGH-SIDE)
•  Start the engine and warm it up completely.
•  Access the FUEL_PRES PID using the M-MDS at idle.
•  Is the FUEL_PRES PID value approx. 10 MPa {101 kgf/cm2, 1450 psi}?
Yes
Go to Step 20.
No
Lower than 10 MPa {101 kgf/cm2, 1450 psi}:
•  Inspect the following:
―  Fuel leakage at the fuel line and fuel injector
―  Fuel pump
•  Perform the Fuel Pump (Low-pressure Side) Operation Inspection.
―  Fuel pressure sensor
―  High pressure fuel pump
•  If there is any malfunction:
―  Repair or replace the malfunctioning part according to the inspection results.
•  If there is no malfunction:
―  Go to Step 19.
Higher than 10 MPa {101 kgf/cm2, 1450 psi}:
•  Go to the next step.
17
DETERMINE IF MALFUNCTION CAUSE IS FUEL PRESSURE SENSOR OR HIGH PRESSURE FUEL PUMP
•  Is the vehicle acceleration performance normal?
Yes
Go to the next step.
No
Go to Step 19.
18
INSPECT FUEL PRESSURE SENSOR
•  Inspect the fuel pressure sensor.
•  Is there any malfunction?
Yes
Replace the fuel distributor.
(See FUEL INJECTOR REMOVAL/INSTALLATION [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
No
Go to Step 20.
19
INSPECT SPILL VALVE CONTROL SOLENOID VALVE CONTROL CIRCUIT FOR SHORT TO GROUND
•  Switch the ignition off.
•  Disconnect the high pressure fuel pump and PCM connectors.
•  Inspect for continuity between high pressure fuel pump terminal A (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Refer to the wiring diagram and verify whether or not there is a common connector between high pressure fuel pump terminal A and PCM terminal 1DI.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
If the malfunction remains:
•  Replace the PCM. (damage to driver in PCM)
No
Replace the high pressure fuel pump.
(See HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
20
INSPECT FUEL PRESSURE (LOW-SIDE)
•  Connect the fuel pressure gauge between fuel pump and high pressure fuel pump.
•  Measure the low side fuel pressure.
•  Is the low side fuel pressure within specification?
Specification:
•  425—505 kPa {4.34—5.14 kgf/cm2, 61.7—73.2 psi}
Yes
Go to the next step.
No
Inspect the following:
•  Fuel line restriction
•  Fuel filter clogged
―  If there is any malfunction:
•  Repair or replace the malfunctioning part according to the inspection results.
―  If there is no malfunction:
•  Replace the fuel pump unit.
21
INSPECT FUEL INJECTOR OPERATION
•  Perform the Fuel Injector Operation Inspection.
•  Do the fuel injectors operate properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results.
22
INSPECT ENGINE COMPRESSION
•  Measure the compression pressure for each cylinder.
•  Are compression pressures within specification?
Yes
Go to Step 28.
No
With coolant control valve:
•  Go to the next step.
Without coolant control valve:
•  Go to Step 26.
23
INSPECT ELECTRIC VARIABLE VALVE TIMING DRIVER
•  Inspect the electric variable valve timing driver.
•  Is there any malfunction?
Yes
Replace the electric variable valve timing motor/driver.
(See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
No
Go to the next step.
24
INSPECT ELECTRIC VARIABLE VALVE TIMING MOTOR
•  Inspect the electric variable valve timing motor.
•  Is there any malfunction?
Yes
Replace the electric variable valve timing motor/driver.
(See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
No
Go to the next step.
25
INSPECT ELECTRIC VARIABLE VALVE TIMING ACTUATOR
•  Inspect the electric variable valve timing actuator.
•  Is there any malfunction?
Yes
Replace the electric variable valve timing actuator.
(See ELECTRIC VARIABLE VALVE TIMING ACTUATOR, HYDRAULIC VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
No
Go to the next step.
26
INSPECT HYDRAULIC VARIABLE VALVE TIMING CONTROL SYSTEM OPERATION
•  Perform the Hydraulic Variable Valve Timing Control System Operation Inspection.
•  Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
27
INSPECT FOR MALFUNCTION DUE TO DEVIATED VALVE TIMING
•  Inspect the valve timing (timing chain installation condition).
•  Is the valve timing normal?
Yes
Inspect for the following engine internal parts:
•  Cylinder
•  Piston ring
•  Intake valve
•  Exhaust valve
•  Such as cylinder head gasket
―  If there is any malfunction:
•  Repair or replace the malfunctioning part according to the inspection results.
No
Adjust the valve timing to the correct timing.
28
INSPECT IGNITION SYSTEM OPERATION
•  Perform the Spark Test.
•  Is a strong blue spark visible at each cylinder?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results.
29
INSPECT EXHAUST SYSTEM FOR RESTRICTION
•  Inspect for restriction in the exhaust system and the TWC.
•  Is there any restriction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
30
INSPECT IF MALFUNCTION CAUSE IS PCV VALVE OR INJECTOR DRIVER (PCM INTEGRATED)
•  Inspect the PCV valve.
•  Is there any malfunction?
Yes
Replace the PCV valve.
(See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [SKYACTIV-G 1.3, SKYACTIV-G 1.5].)
No
Injector driver malfunction.
•  Replace the PCM.
If the problem remains, overhaul the engine.
31
Verify the test results.
•  If normal, return to the diagnostic index to service any additional symptoms.
•  If a malfunction remains, inspect the related Service Information and perform the repair or diagnosis.
―  If the vehicle is repaired, troubleshooting is completed.
―  If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM.