DTC Troubleshooting
| DTC | Description |
|---|---|
| DTC P0505 | Idle Control System Malfunction |
| DTC P0506 | Idle Control System RPM Lower Than Expected |
| DTC P0507 | Idle Control System RPM Higher Than Expected |
| DTC P0511 | IAC Valve Circuit Malfunction |
| DTC P1519 | IAC Valve Circuit Malfunction |
DTC INDEX
Idle Speed Inspection
Note. Leave the idle air control (IAC) valve connected. Before checking the idle speed, check these items: The malfunction indicator lamp (MIL) has not been reported on. Ignition timing Spark plugs Air cleaner PCV system Pull the parking brake lever up. Start the engine, and make sure the headlights are off.
Scheme 189
- Disconnect the evaporative emission (EVAP) canister purge valve 2P connector.
- Connect a tachometer (A) to the test tachometer connector (B), or connect the HDS or a scan tool to the data link connector (DLC) (C) located under the driver's side of the dashboard.
- Start the engine. Hold the engine at 3,000 RPM with no load (in neutral) until the radiator fan comes on, then let it idle.
- Check the idle speed with no-load conditions: headlights, blower fan, and radiator fan, and air conditioner off. Idle Speed Should Be: 750 plus or minus 50 RPM
- Let the engine idle for 1 minute with the heater fan switch on HI and air conditioner on, then check the idle speed. Idle Speed Should Be: 750 plus or minus 50 RPM NOTE: If the idle speed is not within specification, go to the Symptom Troubleshooting.
- Reconnect the EVAP canister purge valve 2P connector.