| 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.
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| 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 |