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 MANUALSJEEP1986COMANCHE CUSTOM, 2.5 H, RWD, STANDARD, AX4REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEM2.5L TBI SYSTEMCOMPONENT TESTINGELECTRONIC CONTROL UNIT TEST
1986 Jeep Comanche Custom, 2.5 H, RWD, Standard, AX4
Electronic Control Unit Test
1986 Jeep Comanche Custom, 2.5 H, RWD, Standard, AX4SECTION Electronic Control Unit Test
- If all components have been checked and/or repaired, but a system failure or problem still exists, the ECU may be at fault. However, the ECU is a very reliable unit and must always be the final component replaced if a doubt exists concerning the cause of a system failure.
- The only way to confirm an ECU malfunction is to take the unit to an AMC dealer to have it tested. This is the only sure way to avoid replacing a good ECU.
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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.