NO.5 ENGINE STALLS-AFTER START/AT IDLE [LF, L5]
id010397801100
5 |
ENGINE STALLS—AFTER START/AT IDLE |
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DESCRIPTION
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• The engine stops unexpectedly at idle and/or after start.
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POSSIBLE CAUSE
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• Improper operation of A/C system
• Air leakage from intake air system parts
• Purge solenoid valve malfunction
• Improper operation of electronic throttle control system
• EGR valve malfunction
• No signal from CKP sensor due to sensor, related wiring or wrong installation
• Vacuum leakage
• Engine overheating
• Low engine compression
• Erratic signal to ignition coil
• Poor fuel quality
• Air cleaner restriction
• Restriction in exhaust system
• Electrical connector disconnection
• Open or short circuit in fuel pump body and related wiring harness
• No battery power supply to PCM or poor ground
• Inadequate fuel pressure
• Fuel pump body mechanical malfunction
• Fuel leakage from fuel injector
• Fuel injector clogging
• Ignition coil malfunction
• Improper air/fuel mixture ratio control
• Improper valve timing
• Improper operation of variable valve timing control system
• Immobilizer system and/or circuit malfunction
• Immobilizer system operating property (Ignition is not registered)
• Pressure regulator malfunction
• PCV valve malfunction
• PCM malfunction
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Diagnostic procedure
STEP |
INSPECTION |
RESULTS |
ACTION |
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1
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Connect the M-MDS to the DLC-2.
Do the following conditions appear?
• The engine is not completely started.
• PCM DTC P1260:00 is displayed.
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Yes
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Both conditions appear:
• Go to Step 3.
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No
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Either condition or other one appears:
• Go to the next step.
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2
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Does the engine stall after approx. 2 s from when the engine is started?
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Yes
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Go to the next step.
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No
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Immobilizer system is normal.
Go to Step 10.
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3
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Is the coil antenna connector securely connected to the coil?
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Yes
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Go to the next step.
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No
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Connect the coil antenna connector securely.
Return to Step 2.
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4
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Does the security light flash?
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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 instrument cluster and wiring harness.
Repair or replace the malfunctioning part according to the inspection results.
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5
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Connect the M-MDS to DLC-2.
Perform the immobilizer system DTC inspection.
Are any DTCs present?
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Yes
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Go to the appropriate DTC inspection.
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No
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Go to the next step.
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6
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Inspect the following wiring harnesses and connectors:
• With advanced keyless entry and push button start system:
• Without advanced keyless entry and push button start system:
Is there any malfunction?
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Yes
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Repair or replace the suspected wiring harness and connector.
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No
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Go to the next step.
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7
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Inspect the following:
• Vacuum connection
• Air cleaner element
• No air leakage from intake air system
• No restriction of intake air system
• Proper sealing of intake manifold and components attached to intake manifold:
• EGR valve
• Ignition wiring
• Fuel quality: proper octane, contamination, winter/summer blend
• Electrical connections
• Smooth operation of throttle valve
Are all items normal?
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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.
Repeat Step 7.
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8
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Connect the M-MDS to the DLC-2.
Access the APP1 and APP2 PIDs using the M-MDS.
Crank the engine with the accelerator pedal released.
Are the APP1 and APP2 PIDs indicating that the accelerator pedal is in the released position?
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Yes
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Go to the next step.
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No
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Inspect for the following:
• APP sensor
• Wiring harness and connector for the following:
Repair or replace the malfunctioning part according to the inspection results.
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9
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Connect the M-MDS to the DLC-2.
Access the TP REL PID using M-MDS.
Crank the engine with the accelerator pedal released.
Is the TP REL PID indicating that the accelerator pedal is in the released position?
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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:
• TP sensor
• Wiring harness and connector for the following:
Repair or replace the malfunctioning part according to the inspection results.
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10
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Connect the M-MDS to the DLC-2.
Retrieve any continuous memory, KOEO and KOER DTCs using the M-MDS.
(See KOEO/KOER SELF TEST [LF, L5].)
• If the engine stalls:
Are any DTCs present?
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Yes
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DTC is displayed:
• Go to the appropriate DTC inspection.
(See DTC TABLE [LF, L5].)
Communication error message is displayed:
• Inspect for the following:
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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11
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Attempt to start the engine at part throttle.
Does the engine run smoothly at part throttle.
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Yes
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Perform the Electronic Throttle Control System Inspection.
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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12
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Connect the M-MDS to the DLC-2.
Access the RPM PID using the M-MDS.
Is the RPM PID indicating the engine speed during engine cranking?
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Yes
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Go to the next step.
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No
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Inspect for the following:
• Open or short circuit in CKP sensor
• Open or short circuit between CKP sensor terminal A and ground
• Open or short circuit between CKP sensor terminal B and PCM terminal 2W
• Open or short circuit between CKP sensor terminal C and PCM terminal 2AQ
Repair or replace the malfunctioning part according to the inspection results.
• If the CKP sensor and wiring harness are normal:
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13
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Visually inspect the CKP sensor and teeth of the crankshaft pulley.
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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14
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Inspect the ignition coil related wiring harness condition (intermittent open or short circuit) for all cylinders.
Is there any malfunction?
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Yes
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Repair or replace the suspected wiring harness.
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No
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Go to the next step.
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15
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Inspect the spark plug condition.
Is the spark plug wet, covered with carbon or grayish white?
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Yes
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Spark plug is wet or covered with carbon:
• Inspect for fuel leakage from the injector.
Spark plug is grayish white:
• Inspect for a clogged fuel injector.
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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16
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Perform the Spark Test.
Is a strong blue spark visible at each cylinder?
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Yes
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If a symptom occurs with the A/C on:
• Go to Step 20.
If not:
• 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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17
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Visually inspect the exhaust system part.
Is there any deformed exhaust system part?
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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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18
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Inspect the fuel line pressure.
Is the fuel line pressure correct?
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Yes
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Go to the next step.
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No
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Zero or low:
• Inspect for the following:
High:
• Replace the fuel pump unit.
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19
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Visually inspect for fuel leakage at the fuel injector O-ring and fuel line.
Repair or replace the malfunctioning part according to the inspection results.
Is the fuel line pressure held after the ignition is off?
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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 fuel injector.
• If the fuel injector has a malfunction:
• If the fuel injector is normal:
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20
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Connect pressure gauges to the A/C low side and high side pressure lines.
Turn the A/C on and measure the low side and high side pressures.
Are the pressures within the specifications?
(See REFRIGERANT PRESSURE CHECK.)
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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 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:
• Repair or replace the malfunctioning part according to the inspection results.
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21
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Disconnect the vacuum hose between the purge solenoid valve and the 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?
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Yes
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Inspect the following:
• Purge solenoid valve
• Evaporative emission control system
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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22
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Is the air leakage felt or heard at the intake air system components while racing the engine to higher speed?
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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 the engine condition while tapping the EGR valve housing.
Does the engine condition improve?
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Yes
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Replace the EGR valve.
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No
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Go to the next step.
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24
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Perform the Variable Valve Timing Control System Operation Inspection.
Does the variable valve timing control system 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 malfunctioning part according to inspection results.
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25
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Is the engine compression correct?
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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 cause.
Repair or replace malfunctioning part according to inspection results.
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26
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Inspect the PCV valve.
Is there any malfunction?
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Yes
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Replace the PCV valve and oil separator as a single unit.
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No
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Inspect the valve timing.
Repair or replace malfunctioning part according to inspection results.
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27
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• Verify the test results.
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