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 MANUALSPLYMOUTH1989COLT L4-1468CC 1.5L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMIGNITION CONTROL MODULEDESCRIPTION AND OPERATION
1989 Plymouth Colt L4-1468cc 1.5L SOHC
Ignition Control Module: Description and Operation
1989 Plymouth Colt L4-1468cc 1.5L SOHCSECTION Description and Operation
Ignition Timing Control System:
The Ignition Timing Control System is operated by the Multi-Point Injection (MPI) controller. The MPI controller uses all of the engine condition and vehicle operating condition sensors (during normal driving conditions) to compute the correct spark advance or retard. The MPI controller uses the power transistor to control the ignition spark.
The power transistor functions to control the ignition timing by interrupting the ignition coil primary current ground causing secondary circuit discharge. The power transistor assembly is a solid state component.
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.