1986 Jeep Comanche Custom, 2.5 H, 4WD, AutomaticFACTORY OEM SERVICE PROCEDURE

Electronic Control Module

The electronic control module has 6 wires that lead to 2-wire and 4-wire connectors. The Red and White wires leading to the 2-wire connector are ignition feed circuits. The White wire is for cranking ignition. The Red wire supplies ignition current with engine running.

The electronic control module uses the Green wire to turn power to the ignition coil off and on. The Orange and Purple wires transmit signals from the pick-up coil to the control unit. The Black wire supplies the distributor ground circuit.

NOTE: The ECU is sealed to resist moisture, dirt and atmospheric conditions. It is non-serviceable and is replaced as a complete unit.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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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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