NO.5 ENGINE STALLS-AFTER START/AT IDLE [MZR 2.3 DISI Turbo]

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5

ENGINE STALLS—AFTER START/AT IDLE
DESCRIPTION
•  Engine stops unexpectedly at idle or after start or both.
POSSIBLE CAUSE
•  A/C system improper operation
•  Air leakage from intake-air system
•  Purge solenoid valve malfunction
•  Improper operation of electronic throttle control system
•  EGR valve malfunction
•  Vacuum leakage
•  Engine overheating
•  Low engine compression
•  Ignition system malfunction
•  Poor fuel quality
•  PCV valve malfunction
•  Intake-air system restriction
•  Exhaust system and/or TWC restriction or clogging
•  Electrical connector disconnection
•  Open or short circuit in the fuel pump (low-side) body or related wiring harness
•  Fuel pump resister or related circuit malfunction
•  No battery power supply to PCM or poor ground
•  Inadequate fuel pressure (high or low pressure side)
•  Fuel pressure sensor (built-in fuel delivery pipe) or related circuit malfunction
•  Spill valve control solenoid valve malfunction (built-in high pressure fuel pump)
•  Relief valve malfunction (built-in fuel delivery pipe)
•  Fuel pump (low-side) body mechanical malfunction
•  Fuel leakage
•  Fuel line restriction
•  Fuel filter clogging
•  Incorrect fuel injection timing
•  High pressure fuel pump malfunction
•  Fuel injector malfunction
•  Ignition coil malfunction
•  Improper air/fuel mixture ratio control
•  No signal from CKP sensor due to sensor, related wiring harness or wrong installation
•  Erratic signal from CMP sensor
•  A/F sensor, HO2S or related circuit malfunction
•  ECT sensor or related circuit malfunction
•  APP sensor or related circuit malfunction
•  MAF sensor (integrated in MAF/IAT sensor) or related circuit malfunction
•  Improper valve timing
•  Improper operation of variable valve timing control system
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 [MZR 2.3 DISI Turbo].) (See AFTER SERVICE PRECAUTION [MZR 2.3 DISI Turbo].)
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
Inspect for the following:
•  Fuel quality (proper octane, contamination, winter/summer blend)
•  Intake-air system leakage and restriction
•  Electrical connectors
•  Poor connection for PCM ground and body ground
•  Fuel leakage
•  Vacuum leakage
Is there any malfunction?
Yes
Service if necessary.
•  Repeat this step.
No
Go to the next step.
2
Switch the ignition to ON.
Retrieve any DTCs using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo].)
Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZR 2.3 DISI Turbo].)
No
Go to the next step.
3
Access the ECT PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo].)
Verify that the ECT PID value is less than 116 °C {241 °F} during driving.
Is the ECT PID value less than specified?
(See PCM INSPECTION [MZR 2.3 DISI Turbo].)
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
Switch the ignition to ON (engine off).
Access the VPWR PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo].)
Is the VPWR PID value B+?
Yes
Go to the next step.
No
Repair or replace the wiring harness between main relay terminal C and PCM terminal 1BE.
5
Note
•  Following test is for stall concerns with the A/C on. If other symptoms exist, go to the next step.
Connect the pressure gauges to A/C low side and high side pressure lines.
Turn the A/C on and measure low side and high side pressures.
Are the pressures within the specifications?
(See REFRIGERANT PRESSURE CHECK.)
Yes
Go to the next step.
No
If the A/C is always on:
•  Go to the symptom troubleshooting “NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY”.
For other symptoms:
•  Inspect the following:
―  Refrigerant charging amount
―  Condenser fan operation
•  Repair or replace the malfunctioning part according to the inspection results.
6
Will the engine run smoothly at part throttle?
Yes
Go to the next step.
No
Go to Step 8.
7
Perform the TP sweep inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].)
Does the electronic throttle control system work properly?
Yes
Visually inspect the throttle body (damage/scratching).
•  If normal:
―  Go to the next step.
•  If not:
―  Repair or replace the malfunctioning parts according to the inspection results.
No
Repair or replace the malfunctioning parts according to the inspection results.
8
Disconnect the vacuum hose between purge solenoid valve and intake manifold from the purge solenoid valve side.
Plug the open end of the vacuum hose.
Start the engine.
Is the engine stall now eliminated?
Yes
Inspect the following:
•  Purge solenoid valve
•  EVAP system
Repair or replace the malfunctioning parts according to the inspection results.
No
Go to the next step.
9
Inspect the engine condition while tapping the EGR valve housing.
Does the engine condition improve?
Yes
Replace the EGR valve.
(See EGR VALVE REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)
No
Go to the next step.
10
Perform the Variable Valve Timing Control System Operation Inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].)
Does the variable valve timing control system work properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning parts according to the inspection results.
11
Inspect the CMP sensor and CKP sensor for the following:
•  Installation condition
•  Damaged trigger wheel and camshaft
•  Open or short circuit in the wiring harnesses
Is there any malfunction?
Yes
Repair or replace the malfunctioning parts according to the inspection results.
No
Go to the next step.
12
Access the following PIDs using the M-MDS:
(See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo].)
•  ECT
•  APP1
•  APP2
•  MAF
•  O2S11
•  O2S12
•  LONGFT1
•  SHTFT1
Do the PID values indicate the correct values under the trouble condition?
(See PCM INSPECTION [MZR 2.3 DISI Turbo].)
Yes
Go to the next step.
No
Inspect the suspected parts and related wiring harness.
•  If normal:
―  Perform the “INTERMITTENT CONCERN TROUBLESHOOTING.
•  If not:
―  Repair or replace the malfunctioning parts according to the inspection results.
13
Inspect for restriction in the exhaust system and TWC.
Is there any restriction?
Yes
Repair or replace the malfunctioning parts according to the inspection results.
No
Go to the next step.
14
Perform the Spark Test.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.3 DISI Turbo].)
Is a strong blue spark visible at each cylinder?
Yes
Go to the next step.
No
Repair or replace the malfunctioning parts according to the inspection results.
15
Access the FUEL_PRES PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo].)
Is the FUEL_PRES PID value within the specification?
(See PCM INSPECTION [MZR 2.3 DISI Turbo].)
Yes
Go to Step 17.
No
Go to the next step.
16
Replace the high pressure fuel pump.
(See HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)
Access the FUEL_PRES PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo].)
Is the FUEL_PRES PID value within the specified?
(See PCM INSPECTION [MZR 2.3 DISI Turbo].)
Yes
High-pressure fuel pump or spill valve control solenoid valve (built-in high pressure fuel pump or fuel pressure sensor) malfunction.
No
Relief valve or fuel pressure sensor malfunction.
•  Replace the fuel delivery pipe.
17
Connect the fuel pressure gauge between the fuel pump and the high pressure fuel pump.
Measure the fuel pressure line of the low pressure side.
(See FUEL LINE PRESSURE INSPECTION [MZR 2.3 DISI Turbo].)
Is the fuel pressure within the specification?
Yes
Go to the next step.
No
Inspect for the following:
•  Fuel line restriction
•  Fuel filter clogging
―  If normal:
•  Replace the fuel pump unit.
―  If not:
•  Repair or replace the malfunctioning parts according to the inspection results.
18
Measure the compression pressure for each cylinder.
(See COMPRESSION INSPECTION [MZR 2.3 DISI Turbo].)
Does the starting system work properly?
Yes
Go to the next step.
No
Inspect for the following:
•  Damaged valve seat
•  Worn valve stem and valve guide
•  Worn or stuck piston ring
•  Worn piston, piston ring or cylinder
•  Improper valve timing
Repair or replace the malfunctioning parts according to the inspection results.
19
Disconnect the fuel injector connectors.
Connect the NOID light to the fuel injector harness-side terminals.
Inspect the NOID light dim during cranking.
Does the NOID light illuminate?
Yes
Go to the next step.
No
Inspect the fuel injector wiring harnesses.
•  If normal:
―  Replace the PCM (injector driver circuit malfunction).
•  If not:
―  Repair or replace the suspected wiring harness.
20
Inspect the PCV valve.
(See POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION [MZR 2.3 DISI Turbo].)
Is the PCV valve normal?
Yes
Replace the fuel injector.
(See FUEL INJECTOR REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)
If a malfunction remains:
•  Repair or replace the malfunctioning part according to the inspection results.
No
Replace the PCV valve.
(See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [MZR 2.3 DISI Turbo].)
21
Verify 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, reprogram the PCM if a later calibration is available. Retest.