Engine Control System

DIAGNOSIS:
- The idle air control solenoid valve is not in function.
- The harness connector between ECM and idle air control solenoid valve is in short or open.

TROUBLE SYMPTOM:
- Erroneous idling
- Engine stalls.
- Engine breathing




1. CHECK INPUT SIGNAL FOR ECM.
1. Turn ignition switch to ON.
2. Measure voltage between ECM and body.

Connector & terminal / Specified voltage:
(E29) No.2 - Body / 0 V -> 13 V
(E29) No.1 - Body / 13 V -> 0 V




2. CHECK IDLE AIR CONTROL SOLENOID VALVE.
1. Turn ignition switch to OFF.
2. Disconnect connector from idle air control solenoid valve.
3. Measure resistance between solenoid valve terminals.

Terminals / Specified resistance:
No.1 - No.2 / 32 Ohm
No.2 - No.3 / 32 Ohm




3. CHECK POWER SUPPLY TO IDLE AIR CONTROL SOLENOID VALVE.
1. Turn ignition switch to ON.
2. Measure voltage between idle air control solenoid valve and body.

Connector & terminal / Specified voltage:
(E11) No.2 - Body / 10 V, min.