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 MANUALSPLYMOUTH1984HORIZON BASE, 1.6 AREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 7 (ENGINE CONTROLS - TESTS W/CODES - 2.2L)SELF-DIAGNOSTIC TESTSTEST TC-12D - IDLE AIR CONTROL MOTOR CIRCUITS
1984 Plymouth Horizon Base, 1.6 A
Test TC-12D - Idle Air Control Motor Circuits
1984 Plymouth Horizon Base, 1.6 ASECTION Test TC-12D - Idle Air Control Motor Circuits
WARNING: This page is about a different car, the 1994 Plymouth Sundance and 1994 Dodge Shadow. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION TABLE. For wiring diagrams, see WIRING DIAGRAMS
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- Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Inspect PCM connector for damaged or pushed out terminals. Repair as necessary. Perform TEST VER-2 . If PCM connector terminals are okay, go to next step.
- Using an external ohmmeter, check resistance of Gray/Red wire between IAC motor connector and PCM connector terminal No. 39. If resistance is more than 5 ohms, repair open in Gray/Red wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.
RENDER: 1.0x
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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.