P1519

DTC P1519: Malfunction in IAC Valve Circuit
1. Do the ECM/PCM Reset Procedure.
2. Turn the ignition switch ON (II).
Is DTC P1519 indicated?
YES - Go to step 3.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the IAC valve and the ECM/PCM.

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




6. At the wire harness, 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 the ECM/PCM connector B (25P).




10. Check for continuity between body ground and ECM/PCM connector terminal B23.
Is there continuity?
YES - Repair short in the wire between the IAC valve and the ECM/PCM (B23).
NO - Go to step 11.




11. Check for continuity between IAC valve 3P connector terminal No.3 and ECM/PCM connector terminal B23.
IS there continuity?
YES - Go to step 12.
NO - Repair open in the wire between the IAC valve and the ECM/PCM (B23).

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




14. Measure voltage between body ground and ECM/PCM connector terminal B23.
Is there battery voltage?
YES - Substitute a known-good ECM/PCM and recheck. If the symptom/indication goes away, replace the original ECM/PCM.
Diagnostic Strategies

NO - Replace the IAC valve.