DTC Troubleshooting: P2552 (40)

DTC P2552:  Throttle Actuator Control Module Relay Malfunction

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, 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 at the ECM/PCM.n


NO - Go to 4.


4.Turn the ignition switch OFF.

5.Jump the SCS line with the HDS.

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

 

7.Disconnect ECM/PCM connectors D (17P).

8.Check for continuity between ECM/PCM connector terminal D15 and body ground.

 

Is there continuity?


YES - Repair short in the wire between the throttle actuator control module relay and ECM/PCM (D15), then go to 10.


NO - Go to 9.


9.Test the throttle actuator control module relay.

Is the relay OK?


YES - Go to 17.


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

10.Reconnect ECM/PCM connectors D (17P).

11.Turn the ignition switch ON (II).

12.Reset the ECM/PCM with the HDS.

13.Do the ECM/PCM 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.

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P2552 is indicated, check for poor connections or loose terminals at the throttle actuator control module relay, the throttle actuator control module and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


NO - Troubleshooting is complete.n


17.Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.

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

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P2552 is indicated, check for poor connections or loose terminals at the throttle actuator control module relay, the throttle actuator control module and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM.n