P0511

DTC P0511: IAC Valve Circuit Malfunction*

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

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 (31 P).




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 and 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 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.