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.
Test QC - Output State Check Not Functioning
- ECA
- Harness circuits (SIG RTN, STO, STI, GND, VPWR, & VREF)
1) Check For Codes 23,53,63 or 68 If vehicle is equipped with a speed control, speed control servo must be electrically disconnected. This prevents the speed control system from affecting throttle plate movement during Output State Check. Rerun QUICK TEST or Output State Check.
Turn key off and wait 10 seconds. Perform KOEO Self-Test. If Codes 23, 53, 63 or 68 are displayed, go to KOEO Self-Test table and service code(s) as necessary. If no codes are displayed, go to TEST QA, step 1. If Code 11 (Pass) is displayed, go to next step.
2) Check Throttle Linkage Check throttle and linkage for sticking or binding. If throttle and linkage are okay, replace TPS and repeat QUICK TEST. If throttle and linkage are binding, repair as necessary and repeat QUICK TEST.
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.