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1
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VERIFY IF MALFUNCTION CAUSED BY ENGINE MALFUNCTION
• Verify the vehicle engine condition.
• Can malfunction symptoms other than “NO.14 POOR FUEL ECONOMY” be verified?
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Yes
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Go to the applicable symptom troubleshooting.
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No
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Go to the next step.
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2
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INSPECT COOLING SYSTEM FOR MALFUNCTION
• Is any cooling system concern (overheating, runs cold) present?
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Yes
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Perform the applicable symptom troubleshooting.
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No
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Go to the next step.
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3
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VERIFY PCM DTC
• Retrieve any DTCs using the M-MDS.
• Are any DTCs present?
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Yes
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Go to the applicable DTC inspection.
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No
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Go to the next step.
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4
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VERIFY CURRENT INPUT SIGNAL STATUS
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Caution
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• 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:
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― APP1
― APP2
― ECT
― IAT
― MAF
― MAP
― MAP_V
― TP_REL
• Do the PIDs indicate the correct values under the malfunction condition?
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Yes
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Go to the next step.
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No
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APP1, APP2 PIDs are not as specified:
• Inspect the APP sensor.
ECT PID is not as specified:
• Inspect the ECT sensor.
IAT PID is not as specified:
• Inspect the IAT 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.
TP_REL PID is not as specified:
Repair or replace the malfunctioning part according to the inspection results.
• If the malfunction remains:
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― Perform the “INTERMITTENT CONCERN TROUBLESHOOTING” procedure.
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5
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DETERMINE IF MALFUNCTION CAUSE IS A/C REQUEST SIGNAL OR OTHER
• Access the AC_REQ PID using the M-MDS.
• Monitor the AC_REQ PID while turning on and off the air conditioner using the switch on the control panel.
• Does the AC_REQ PID value change from on to off according to switch control panel?
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Yes
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Go to the next step.
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No
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If the AC_REQ PID is always ON:
• Perform the symptom troubleshooting “NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY”.
If the AC_REQ PID is always OFF:
• Perform the symptom troubleshooting “NO.23 A/C DOES NOT WORK SUFFICIENTLY”.
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6
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INSPECT FUEL INJECTOR OPERATION
• Perform the Fuel Injector Operation Inspection.
• Do the fuel injectors operate properly?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning part according to the inspection results.
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7
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INSPECT ENGINE.IG1 7.5 A FUSE
• Switch the ignition off.
• Remove the ENGINE.IG1 7.5 A fuse.
• Inspect the ENGINE.IG1 7.5 A fuse.
• Is there any malfunction?
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Yes
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If the fuse is blown:
• Refer to the wiring diagram and verify whether or not there is a common connector between ENGINE.IG1 7.5 A fuse and PCM terminal 2F.
If there is a common connector:
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― 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:
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― Repair or replace the wiring harness which has a short to ground.
― Replace the fuse.
If the fuse is damaged:
• Replace the fuse.
Go to the next step.
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No
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Reinstall the ENGINE.IG1 7.5 A fuse, then go to the next step.
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8
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INSPECT IG1 RELAY No.1 CIRCUIT FOR SHORT TO POWER SUPPLY
• Remove the IG1 relay No.1.
• Disconnect the PCM connector.
• Measure the voltage at the IG1 relay No.1 terminal C (wiring harness-side).
• Is the voltage 0 V?
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Yes
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Inspect the IG1 relay No.1.
• If there is any malfunction:
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― Replace the IG1 relay No.1.
• If there is no malfunction:
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― Reconnect all disconnected connectors.
― Go to the next step.
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No
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Refer to the wiring diagram and verify whether or not there is a common connector between IG1 relay No.1 terminal C and PCM terminal 2F.
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 power supply.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness which has a short to power supply.
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9
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INSPECT RELATED PART CONDITION
• Inspect the following:
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― Air cleaner element for contamination
― Intake-air system restriction
― Fuel quality (proper octane, contamination, winter/summer blend)
― Coolant level
― Clutch slippage (MTX)
― ATF level (ATX)
― Brake dragging
― Tire air pressure
― Vacuum leakage
― Fuel leakage
― MAF sensor contaminated
― Tires, wheels (large size)
― Change of intake air system components and exhaust system components
― Engine operation time is longer than traveled distance
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• Vehicle is driven in congested traffic frequently
• Left idling for long periods
― Amount of fuel injection increases
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• Overloaded
• Frequent acceleration/deceleration
• Frequently driving on ascending roads
• Travel distance per one drive is short
― Driver forgets to switch electronic device off
― Electronic device is frequently used with engine stopped (no power generation)
― Vehicle left undriven for long periods
― Large amount of parasitic draw
― CKP sensor, intake CMP sensor and exhaust CMP sensor
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• Damaged trigger wheel, intake camshaft and exhaust camshaft
• Is there any malfunction?
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Yes
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Service if necessary.
• Repeat this step.
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No
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Go to the next step.
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10
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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, 1432 psi}?
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Yes
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Go to Step 14.
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No
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Lower than approx. 10 MPa {101 kgf/cm2, 1432 psi}:
• Inspect the following:
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― Fuel leakage at the fuel line and fuel injector
― Fuel pump
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• Perform the Fuel Pump (Low-pressure Side) Operation Inspection.
― High pressure fuel pump
• If there is any malfunction:
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― Repair or replace the malfunctioning part according to the inspection results.
• If there is no malfunction:
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― Go to Step 15.
Higher than approx. 10 MPa {101 kgf/cm2, 1432 psi}:
• Go to the next step.
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11
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DETERMINE IF MALFUNCTION CAUSE IS FUEL PRESSURE SENSOR OR HIGH PRESSURE FUEL PUMP
• Is the vehicle acceleration performance normal?
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Yes
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Go to the next step.
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No
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Go to Step 13.
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12
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INSPECT FUEL PRESSURE SENSOR
• Inspect the fuel pressure sensor.
• Is there any malfunction?
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Yes
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Replace the fuel distributor.
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No
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Go to Step 14.
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13
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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?
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Yes
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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)
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No
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Replace the high pressure fuel pump.
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14
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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:
• 405—485 kPa {4.13—4.94 kgf/cm2, 58.8—70.3 psi}
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Yes
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Go to the next step.
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No
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Inspect the following:
• Fuel line restriction
• Fuel filter clogged
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― If there is any malfunction:
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• Repair or replace the malfunctioning part according to the inspection results.
― If there is no malfunction:
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• Replace the fuel pump unit.
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15
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INSPECT ENGINE COMPRESSION
• Measure the compression pressure for each cylinder.
• Are compression pressures within specification?
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Yes
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Go to Step 21.
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No
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Go to the next step.
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16
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INSPECT ELECTRIC VARIABLE VALVE TIMING DRIVER
• Inspect the electric variable valve timing driver.
• Is there any malfunction?
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Yes
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Replace the electric variable valve timing motor/driver.
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No
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Go to the next step.
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17
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INSPECT ELECTRIC VARIABLE VALVE TIMING MOTOR
• Inspect the electric variable valve timing motor.
• Is there any malfunction?
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Yes
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Replace the electric variable valve timing motor/driver.
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No
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Go to the next step.
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18
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INSPECT ELECTRIC VARIABLE VALVE TIMING ACTUATOR
• Inspect the electric variable valve timing actuator.
• Is there any malfunction?
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Yes
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Replace the electric variable valve timing actuator.
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No
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Go to the next step.
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19
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INSPECT HYDRAULIC VARIABLE VALVE TIMING CONTROL SYSTEM OPERATION
• Perform the Hydraulic Variable Valve Timing Control System Operation Inspection.
• Is there any malfunction?
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Yes
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Repair or replace the malfunctioning part according to the inspection results.
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No
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Go to the next step.
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20
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INSPECT FOR MALFUNCTION DUE TO DEVIATED VALVE TIMING
• Inspect the valve timing (timing chain installation condition).
• Is the valve timing normal?
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Yes
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Inspect for the following engine internal parts:
• Cylinder
• Piston ring
• Intake valve
• Exhaust valve
• Such as cylinder head gasket
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― If there is any malfunction:
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• Repair or replace the malfunctioning part according to the inspection results.
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No
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Adjust the valve timing to the correct timing.
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21
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INSPECT IGNITION SYSTEM OPERATION
• Perform the Spark Test.
• Is the strong blue spark visible at each cylinder?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning part according to the inspection results.
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22
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INSPECT EXHAUST SYSTEM FOR RESTRICTION
• Inspect for restriction in the exhaust system and the TWC.
• Is there any restriction?
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Yes
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Repair or replace the malfunctioning part according to the inspection results.
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No
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Go to the next step.
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23
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INSPECT IF MALFUNCTION CAUSE IS PCV VALVE OR INJECTOR DRIVER (PCM INTEGRATED)
• Is there any malfunction?
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Yes
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Replace the PCV valve.
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No
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Injector driver malfunction.
If the problem remains, overhaul the engine.
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24
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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.
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― If the vehicle is repaired, troubleshooting is completed.
― If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM.
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