## DTC Troubleshooting: P1519 (14-3)

DTC P1519 (14-3): | IAC Valve Circuit Malfunction

1. | Reset the ECM/PCM.

2. | Turn the ignition switch ON (II). Is DTC P1519 indicated? YES - Go to 3. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the IAC valve and at the ECM/ PCM.n

3. | Turn the ignition switch OFF.

4. | Disconnect the IAC valve 3P connector.

5. | Turn the ignition switch ON (II).

6. | Measure voltage between the IAC valve 3P connector terminal No. 2 and body ground. Is there battery voltage? YES - Go to 7. NO - Repair open in the wire between the IAC valve and the PGM-FI main relay.n

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

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).n NO - Go to 11.

11. | Connect the 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 13. NO - Repair open in the wire between the IAC valve and the ECM/PCM (A12).n

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.n NO - Replace the IAC valve.n