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.
1990 Plymouth Laser Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Control Relay (2.0L)
- Control relay is located on right side of center console. Disconnect control relay connector.
- Apply battery voltage to control relay terminal No. 10. While applying battery voltage to control relay terminal No. 10, ensure battery voltage is not present at terminals No. 4 and 5. See Fig 1 . While applying battery voltage to terminal No. 10 and grounding terminal No. 8, ensure battery voltage is present at terminals No. 4 and 5.
- While grounding terminal No. 6, ensure continuity is not present at terminals No. 2 and 3. While applying battery voltage to terminal No. 9 and grounding terminal No. 6, ensure continuity is present at terminals No. 2 and 3.
- To check for short to ground, apply battery voltage to terminal No. 3, and ensure there is no voltage at terminal No. 2. While applying battery voltage to terminal No. 3 and grounding terminal No. 7, battery voltage should be present at terminal No. 2. Replace control relay if it does not test as described.
Factory Service Tools
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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.
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