SYSTEM TEST
- Start engine, and warm to operating temperature. Check Idle speed. If idle speed is excessive, disconnect IACV-AAC valve harness connector, idle speed should drop. If idle speed does not drop, check for battery voltage at IACV-AAC connector terminal "A" (Gray wire on G20, Green/Yellow wire on J30, Red wire on Q45). If battery voltage is present, go to next step. If battery voltage is not present, check fuses and harness for open circuit.
- Turn ignition off. Disconnect ECM harness Connector. Check harness continuity between IACV-AAC connector terminal "B" (Light Blue wire on G20, Blue wire on J30, Brown/White wire on Q45) and ECM. (Terminal 113 on G20, terminal 4 on J30 or terminal 111 on Q45). Continuity should exist. If continuity does not exist, repair wire as necessary.
- If harness tests okay, test IACV-AAC valve and inspect ECM connector terminal pins.
Note. On Q45, see ADJUSTMENTS article in the ENGINE PERFORMANCE Section for testing and adjustment of fast idle cam.
| Application | Model Usage |
|---|
| A/C Clutch Signal | G20, (1) J30 & (1) Q45 |
| Mass Airflow Sensor | Q45 |
| Battery Voltage | G20, J30 & Q45 |
| Crankshaft Position Sensor | G20, J30 & Q45 |
| Engine (Coolant) Temperature | G20, J30 & Q45 |
| Ignition (START) Signal | G20, J30 & Q45 |
| Neutral Switch | (2) G20 |
| Park/Neutral (Inhibitor) Switch | G20, (3) J30 & (4) Q45 |
| Power Steering Pressure Switch | G20, J30 & Q45 |
| Throttle Position Sensor | G20, J30 & Q45 |
| Closed Throttle Position Switch | J30 & Q45 |
| Vehicle Speed Sensor | G20, J30 & (3) Q45 |
| (1) Signal received from automatic A/C amplifier. (2) M/T models only. (3) Signal received from transmission control unit. (4) Signal received from P/N relay. |
| (1) | Signal received from automatic A/C amplifier. |
| (3) | Signal received from transmission control unit. |
| (4) | Signal received from P/N relay. |
IDLE SPEED SYSTEM INPUT SIGNALS
