DATA LIST REFERENCE DATA
For data list reference data (Scheme 219)- (Scheme 228).
Scheme 219
Scheme 220
Scheme 221
Scheme 222
Scheme 223
Scheme 224
Scheme 225
Scheme 226
Scheme 227
Scheme 228
Comment
The cause is probably a defect in power supply system (including ground) for the on-board diagnostic test mode line.
- No power supply to ECM.
- Defective ground circuit of ECM.
- Defective ECM.
- Improper communication line between ECM and scan tool.
The ECM causes the malfunction indicator light (SERVICE ENGINE SOON) to illuminate for 5 seconds immediately after the ignition switch is turned to ON position has occurred.
In such cases, the cause is probably that the ECM is detecting a problem in a sensor or actuator, or that one the most likely malfunctions listed has probably occurred. See TROUBLE SHOOTING HINTS .
In cases listed, the cause is probably no spark, fuel delivery, or fuel quality problems. In addition, foreign materials (water, kerosene, etc.) may be mixed with the fuel. See TROUBLE SHOOTING HINTS .
In such cases, the cause is usually improper air/fuel mixture. It is possible, though less likely, the spark plugs are generating spark, but the spark is weak.
The cause is usually either weak spark, improper air-fuel mixture or low compression.
The cause is probably the air/fuel mixture or idle air control motor. Other systems affecting idle quality include the ignition system and compression.
The cause is probably that the intake air volume during idle is too great.
The cause is probably that the intake air volume during idle is too small.
The air/fuel mixture may be inappropriate when the engine is cold.
The ignition system air/fuel mixture, Idle Air Control (IAC) motor or compression pressure may be faulty. In addition, if the engine suddenly stalls, the cause may also be loose connector.
The cause is probably misfiring due to a weak spark, or an inappropriate air/fuel mixture. When the accelerator pedal is depressed.
The intake air volume may be insufficient due to a defective Idle Air Control (IAC) motor system.
The ignition system, air/fuel mixture or compression pressure may be defective.
There may be an ignition leak accompanying the increase in the spark plug demand voltage during acceleration.
There may be a sudden change in airflow through the Idle Air Control (IAC), causing the vehicle to decelerate rapidly for an instant.
Defective ignition system, abnormal air/fuel ratio, poor compression pressure, etc. are suspected.
Defective ignition system, abnormal air/fuel ratio, etc. are suspected.
The cause is probably that the detonation control is defective or the heat value of the spark plug is inappropriate.
Fuel leakage from injectors is suspected, or carbon build up.
Abnormal air/fuel ratio is suspected.
The test failed when the air/fuel ratio is not controlled to the ideal air/fuel ratio. This occurs due to the feedback control by heated oxygen sensor signal, insufficient EGR flow rate, or deteriorated catalyst.
The test fails if there is a leak from the fuel tank or vapor line.
Intermittent Simulation
To reproduce the conditions creating an intermittent fault, use the following methods
- Lightly vibrate or tap component.
- Heat component.
- Wiggle or bend wiring harness, shake, wiggle harness connector.
- Spray component with water.
- Remove/apply vacuum source.
Monitor circuit/component voltage or resistance while simulating intermittent. If engine is running, monitor for DTCs. Use test results to identify a faulty component or circuit.