P0511

DTC P0511: IAC Valve Circuit Malfunction (2004 - 2005 models)

NOTE:
- Information marked with an asterisk (*) applies to 2004-2005 models.
- Information marked with double asterisk (**) applies to 2000-2003 models.
- Before you troubleshoot, record all freeze data and review the general troubleshooting information.

1. Reset the ECM.
2. Turn the ignition switch ON (II).

Is DTC P05117* (P1519)** indicated?

YES - Go to step 3.

NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the IAC valve and at the ECM.

3. Turn the ignition switch OFF.
4. Disconnect the IAC valve 3P connector.
5. Turn the ignition switch ON (II).




6. Measure voltage between IAC valve 3P connector terminal No. 2 and body ground.

Is there battery voltage?

YES - Go to step 7.

NO - Repair open in the wire between the IAC valve and the PGM-FI main relay.

7. Turn the ignition switch OFF.




8. Check for continuity between body ground and IAC valve 3P connector terminal No. 1.

Is there continuity?

YES - Go to step 9.

NO - Repair open in the wire between the IAC valve and G101.

9. Disconnect ECM connector B (25P).




10. Check for continuity between body ground and ECM connector terminal B23.

Is there continuity?

YES - Repair short in the wire between the IAC valve and the ECM (B23).

NO - Go to step 11.




11. Connect IAC valve 3P connector terminal No. 3 and body ground with a jumper wire.




12. Check for continuity between ECM connector terminal B23 and body ground.

Is there continuity?

YES - Go to step 13.

NO - Repair open in the wire between the IAC valve and the ECM (B23).

13. Remove the jumper wire from the IAC valve 3P connector, then reconnect the IAC valve 3P connector.
14. Turn the ignition switch ON (II).




15. Measure voltage between body ground and ECM connector terminal B23.

Is there battery voltage?

YES - Substitute a known-good ECM and recheck. If the symptom/indication goes away, replace the original ECM.

NO - Replace the IAC valve.