DTC P2552: Throttle Actuator Control Module Relay Malfunction

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Do the ETCS TEST in the INSPECTION MENU with the HDS.
Is the RELAY circuit OK?
1. 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 the ECM/PCM.
2. NO - Go to step 4.
Turn the ignition switch OFF.
Jump the SCS line with the HDS.
Remove the throttle actuator control module relay (A).

Fig 1: Removing Throttle Actuator Control Module Relay
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Disconnect ECM/PCM connector D (17P).
Check for continuity between ECM/PCM connector terminal D15 and body ground.

Fig 2: Checking Continuity Between ECM/PCM Connector Terminal D15 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Repair short in the wire between the throttle actuator control module relay and the ECM/PCM (D15), then go to step 10.
2. NO - Go to step 9.
Test the throttle actuator control module relay (see POWER RELAY TEST ).
Is the relay OK?
1. YES - Go to step 17.
2. NO - Replace the throttle actuator control module relay, then go to step 10.
Reconnect ECM/PCM connector D (17P).
Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
Turn the ignition switch OFF.
Turn the ignition switch ON (II), and wait 10 seconds.
Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
1. 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 step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
2. NO - Troubleshooting is complete.
Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see ECM/PCM UPDATING AND SUBSTITUTION FOR TESTING ).
Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
1. 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 step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
2. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ).