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 MANUALSPLYMOUTH1985HORIZON L4-135 2.2L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESWITH SINGLE POINT FUEL INJECTION (SPI)15-STEP D, LOGIC MODULE GROUND CIRCUIT
1985 Plymouth Horizon L4-135 2.2L SOHC
15-Step D, Logic Module Ground Circuit
1985 Plymouth Horizon L4-135 2.2L SOHCSECTION 15-Step D, Logic Module Ground Circuit
1. With ignition switch in the RUN position, connect a suitable digital voltmeter between terminal No. 23 of the logic module white electrical connector and ground.
2. If voltmeter indicates 7 1/2 to 9 volts, proceed to Test 15 step E.
3. If voltmeter indicates 0 volts, proceed to Test 15 step F.
RENDER: 1.0x
NO RELATED
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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.