DTC Troubleshooting

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.

1. Turn the ignition switch 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 OFF.




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

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 ON (II).
12. Reset the ECM with the HDS.
13. Do the ECM idle learn procedure.
14. Turn the ignition switch OFF.
15. Turn the ignition switch 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 DTCs troubleshooting.

17. Reconnect all connectors.
18. Update the ECM if it does not have the latest software, or substitute a known-good ECM.
19. 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, then recheck. 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. If any other Temporary DTCs or DTCs are indicated, Go to the indicated DTCs troubleshooting.