P0511

DTC P0511: IAC Valve Circuit Malfunction*

NOTE: Information marked with an asterisk (*) applies to '04 models.

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

Is DTC P1519 (P0511)* 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/PCM.

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/PCM connector A (31P).




10. Check for continuity between body ground and ECM/PCM connector terminal A12.

Is there continuity?

YES - Repair short in the wire between the IAC valve and the ECM/PCM (A12).

NO - Go to step 11.




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




12. Check for continuity between ECM/PCM connector terminal A12 and body ground.

Is there continuity?

YES - Go to step 13.

NO - Repair open in the wire between the IAC valve and the ECM/PCM (A12).

13. Reconnect the IAC valve 3P connector.
14. Turn the ignition switch ON (II).




15. Measure voltage between body ground and ECM/PCM connector terminal A12.

Is there battery voltage?

YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.

NO - Replace the IAC valve.