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.
Diagnosis & Repair
Retrieve trouble codes. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If other codes are displayed, diagnose and repair those codes first and retest. If only DTC P1129 is displayed, go to next step. Clear and retrieve trouble codes. If DTC P1129 is displayed again, replace throttle body and retest.
Check throttle control motor for operating sound. Turn ignition on. When turning accelerator pedal position sensor lever, check running sound of motor. Ensure there is no friction sound. Check accelerator pedal position sensor with scan tool. Standard throttle valve opening percentage is 60 percent or more. If not to specification, check sensor, wiring and ECM. If all components are okay, replace ECM.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.