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 DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - IGNITION SYSTEMELECTRONIC SPARK CONTROL MODULEDESCRIPTION AND OPERATIONELECTRONIC SPARK ADVANCE COMPUTER
1985 Plymouth Horizon L4-135 2.2L SOHC
Electronic Spark Advance Computer
1985 Plymouth Horizon L4-135 2.2L SOHCSECTION Electronic Spark Advance Computer
The Electronic Spark Advance (ESA) computer, used on some 1985 - 87 models, is programmed to monitor several different component systems. If a malfunction in a monitored circuit is detected often enough to indicate an actual problem, a corresponding ``fault code'' is stored in the computer for display on diagnostic readout tool C-4805. If the malfunction is repaired or ceases to exist, the code will be erased from the computers memory after 30 ignition key on/off cycles.
The diagnostic readout tool can be used to check different modes: the Diagnostic Test Mode, Circuit Actuation Test Mode and Switch Test Mode.
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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.