Engine General Information and Diagnosis: 1A-37
Troubleshooting Without Self-Diagnostic Code
Z9J0111104018
Before troubleshooting, make sure that there is not a self-diagnostic code indication.
Condition Possible cause Correction / Reference Item
Unstable idling / trolling
(or engine tends to stall)
Clogged MAP sensor vacuum passage. Check the vacuum passage.
Malfunctioning TPS. Check the TPS sensor.
Faulty IAC system. Check the IAC system.
Fuel pressure out of specification. Check the fuel pressure.
Faulty injector or its circuit. Check the injector and its circuit.
Poor performance of the IAT sensor,
TPS or MAP sensor.
Check each sensor.
Faulty ECM. Replace.
Faulty spark plug. Replace.
Faulty ignition coil or its circuit. Check the ignition coil and its circuit.
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