DTC P2101: Electronic Throttle Control System (ETCS) Malfunction

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Do the ETCS TEST in the INSPECTION MENU with the HDS.
Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2101 indicated?
1. YES - Go to step 7.
2. NO - Go to step 5.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
- ENGINE SPEED
- VSS
- APP SENSOR A
Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2101 indicated?
1. YES - Go to step 7.
2. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the throttle body and the PCM, then clean the throttle body (see THROTTLE BODY TEST ).
Turn the ignition switch OFF.
Disconnect the intake air duct from the throttle body.
Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Do the ETCS TEST in the INSPECTION MENU with the HDS.
Visually check the throttle valve operation.
NOTE: Be careful not to pinch your fingers during the check.

Does the throttle valve operate smoothly?
1. YES - Clean the throttle body (see THROTTLE BODY TEST ), then go to step 21 and recheck. If DTC P2101 is indicated, go to step 19.
2. NO - Go to step 13.
Turn the ignition switch OFF.
Disconnect the throttle body 6P connector.
Jump the SCS line with the HDS.
Disconnect PCM connector C(44P).
Connect throttle body 6P connector terminals No. 5 and No. 6 with a jumper wire.

Fig 1: Connecting Throttle Body 6P Connector Terminals No. 5 And No. 6 With A Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check for continuity between PCM connector terminals C2 and C3.

Fig 2: Checking Continuity Between PCM Connector Terminals C2 And C3
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Go to step 27.
2. NO - Repair open in the wires between the throttle body and the PCM (C2, C3), then go to step 20.
Turn the ignition switch OFF.
Replace the throttle body (see THROTTLE BODY REMOVAL/INSTALLATION ).
Turn the ignition switch ON (II).
Reset the PCM with the HDS.
Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
- ENGINE SPEED
- VSS
- APP SENSOR A
Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2101 indicated?
1. YES - Check for poor connections or loose terminals at the throttle body and the PCM, then clean the throttle body (see THROTTLE BODY TEST ), and go to step 1.
2. NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.
Reconnect all connectors.
Update the PCM if it does not have the latest software, or substitute a known-good PCM (see PCM UPDATING AND SUBSTITUTION FOR TESTING ).
Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2101 indicated?
1. YES - Check for poor connections or loose terminals at the throttle body and the PCM. If the PCM was updated, substitute a known-good PCM (see PCM UPDATING AND SUBSTITUTION FOR TESTING ), then recheck. If the PCM was substituted, go to step 1.
2. NO - If the PCM was updated; troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.