DTC Troubleshooting

DTC Troubleshooting: P2552

DTC P2552: Throttle Actuator Control Module Relay Malfunction

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information. Initial Inspection and Diagnostic Overview

1. Turn the ignition switch to ON (II).

2. Clear the DTC with the HDS.

3. Do the ETCS TEST in the INSPECTION MENU with the HDS.

Is the RELAY circuit OK?
YES - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle actuator control module relay, the throttle actuator control module, and the ECM.

NO - Go to step 4.


4. Turn the ignition switch to LOCK (0).

5. Remove the throttle actuator control module relay (A).






6. Test the throttle actuator control module relay. Testing and Inspection

Is the relay OK?
YES - Go to step 7.

NO - Replace the throttle actuator control module relay, then go to step 10.


7. Jump the SCS line with the HDS.

8. Disconnect ECM connector D (17P).

9. Check for continuity between ECM connector terminal D15 and body ground.

Is there continuity?
YES - Repair short in the wire between the throttle actuator control module relay and the ECM (D15), then go to step 10.

NO - Go to step 17.






10. Reconnect ECM connector D (17P).

11. Turn the ignition switch to ON (II).

12. Reset the ECM with the HDS.

13. Do the ECM idle learn procedure. ECM Idle Learn Procedure

14. Turn the ignition switch to LOCK (0).

15. Turn the ignition switch to ON (II), and wait 10 seconds.

16. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2552 indicated?
YES - Check for poor connections or loose terminals at the throttle actuator control module relay, the throttle actuator control module, and the ECM, then go to step 1.

NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


17. Reconnect all connectors.

18. Update the ECM if it does not have the latest software, ECM Update or substitute a known-good ECM. Initial Inspection and Diagnostic Overview

19. Turn the ignition switch to LOCK (0).

20. Turn the ignition switch to ON (II), and wait 10 seconds.

21. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2552 indicated?
YES - Check for poor connections or loose terminals at the throttle actuator control module relay, the throttle actuator control module, and the ECM. If the ECM was updated, substitute a known-good ECM, Initial Inspection and Diagnostic Overview then go to step 19. If the ECM was substituted, go to step 1.

NO - If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM. Service and Repair If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.