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.
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HOMESERVICE MANUALSPLYMOUTH1994GRAND VOYAGER BASE, 31THREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - 2.5L TBISELF-DIAGNOSTIC TESTSTEST TC-12C - IDLE AIR CONTROL MOTOR CIRCUITS
1994 Plymouth Grand Voyager Base, 31TH
Test TC-12C - Idle Air Control Motor Circuits
1994 Plymouth Grand Voyager Base, 31THSECTION Test TC-12C - Idle Air Control Motor Circuits
NOTE:
For circuit and connector terminal identification, see CONNECTOR IDENTIFICATIONΒ
in this article. For wiring diagrams, see WIRING DIAGRAMSΒ
section.
- Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Inspect PCM connector for damaged or pushed out terminals. Repair as necessary. Perform TEST VER-2Β . If PCM connector terminals are okay, go to next step.
- Using an external ohmmeter, check resistance of Yellow/Black wire between IAC motor connector and PCM connector terminal No. 60. If resistance is more than 5 ohms, repair open in Yellow/Black wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.