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.
2003 Acura MDX BaseFACTORY OEM SERVICE PROCEDURE
DTC P2118: Throttle Actuator Control Module Range/Performance Problem
CAUTION:
When substituting or replacement of PCM is recommended, see PCM REMOVAL & REPLACEMENT
for important precautions.
- Turn ignition on. Using Honda PGM Tester or the HDS, do the DTC CLEAR in the CLEAR menu.
- Press accelerator several times. Check for Temporary DTCs or DTCs in the DTC menu. If DTC P2118 is set, go to next step. If DTC P2118 is not set, problem is intermittent. System is OK at this time. Check for poor connections or loose terminals at throttle actuator control module and PCM.
- Turn ignition off. Replace throttle body assembly. Turn ignition on. Using Honda PGM Tester or the HDS, do the PCM RESET in the CLEAR menu. Do the PCM idle learn procedure. See PCM IDLE LEARN PROCEDURE . Go to next step.
- Check for Temporary DTCs or DTCs in the DTC menu. If DTC P2118 is set, update the PCM if it does not have the latest software, or substitute a known-good PCM. Do the PCM idle learn procedure. See PCM IDLE LEARN PROCEDURE . If DTC P2118 is not set, troubleshooting is done.
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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