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 MANUALSPLYMOUTH1984COLT E, 4D HATCHBACK, 1.4 AREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMECI SYSTEMTESTING & DIAGNOSISCOMPONENT TESTINGCONTROL RELAY
1984 Plymouth Colt E, 4D Hatchback, 1.4 A
Control Relay
1984 Plymouth Colt E, 4D Hatchback, 1.4 ASECTION Control Relay
- Control relay is mounted on top of ECU. Disconnect electrical harness and test continuity between terminals 1 and 7 and 3 and 7. If there is no continuity, relay is good. If continuity is measured, replace control relay.
- Apply battery voltage to terminals 8 (positive) and 4 (negative). Measure continuity between terminals 3 and 7. If continuity is measured, relay is good. If not, replace relay.
- Apply battery voltage across terminals 6 (positive) and 4 (negative) while testing continuity between terminals 1 and 7. If there is continuity, relay is good. If not, replace relay.
- Apply battery voltage across terminals 5 (positive) and 2 (negative) while testing continuity between terminals 1 and 7. If there is continuity, relay is good. If not, replace relay.
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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.