Harness Inspection

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Step 4

TROUBLESHOOTING HINTS

Hint 1: If unexpected shocks are felt during driving or the engine stalls suddenly during idling, shake the crankshaft position sensor harness. If this causes the engine to stall, poor contact of the sensor connector is suspected.

Hint 2: If the crankshaft position sensor outputs a pulse signal when the ignition switch is turned to ON, (without starting the engine), the crankshaft position sensor or engine control module is probably defective.

Hint 3: If the tachometer reads 0 RPM when the engine that has failed to start is cranked, faulty crankshaft position sensor or broken timing belt is suspected.

Hint 4: If the tachometer reads 0 RPM when the engine that has failed to start is cranked, the primary current of the ignition coil is not turned on and off. Therefore, troubles in the ignition circuit and ignition coil or faulty power transistor is suspected.

Hint 5: If the engine can be run at idle even though the crankshaft position sensor reading is out of specification, troubles are often in areas other than the crankshaft p05ition sensor.

Examples

1. Faulty engine coolant temperature sensor
2. Faulty idle air control motor
3. Poorly adjusted basic idle speed