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 MANUALSPLYMOUTH1993LASER FWD L4-1753CC 1.8L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSA/C SIGNALDESCRIPTION AND OPERATION
1993 Plymouth Laser FWD L4-1753cc 1.8L SOHC
A/C Signal: Description and Operation
1993 Plymouth Laser FWD L4-1753cc 1.8L SOHCSECTION Description and Operation
A/C Circuit:
Operation
When the driver turns on the A/C system, a positive voltage signal is supplied to the ECM (as an indication that the A/C system is needed) and to one side of the A/C relay coil, located on the left fender apron near the firewall.
The ECM determines if engine conditions are suitable for A/C operation (idle speed, ignition timing and air/fuel mixture). If the ECM senses that conditions are suitable for A/C operation, it supplies the ground circuit for the A/C relay coil, energizing it. This allows the relay to supply voltage to the compressor clutch.
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.