Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P2118: Throttle Actuator Current Range/ Performance Problem
- Jump the SCS line with the HDS.
- Disconnect PCM connector C (49P).
- Measure resistance between PCM connector terminals C2 and C3.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there about 1.0 Ω or less?
YES - Go to step 4.
NO - Go to step 15.
- Disconnect the throttle body 6P connector.
- At the throttle body side, measure resistance between throttle body 6P connector terminals No. 5 and No. 6 with the throttle fully closed.Fig 2: Identifying Resistance Between Throttle Body 6P Connector Terminals No. 5 And No. 6 With Throttle
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there about 1.0 Ω or less?
YES - Go to step 6.
NO - Repair short in the wires between the PCM C3 (ETCSM-line) and C4 (ETCSM+line), then go to step 7.
- Replace the throttle body (see THROTTLE BODY REMOVAL/INSTALLATION ).
- Reconnect all connectors.
- Turn the ignition switch ON (II).
- Reset the PCM with the HDS.
- Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
- Turn the ignition switch OFF.
- Turn the ignition switch ON (II).
- Slowly press the accelerator pedal to the floor.
- Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2118 indicated?
YES - Check for poor connections or loose terminals at the throttle body and the PCM, then go to step 1.
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 (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
- Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2118 indicated?
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 SUBSTITUTING THE PCM ), then recheck. If the PCM was substituted, go to step 1.
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.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.