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.
2000 Jeep Cherokee Classic, 2D PickupFACTORY OEM SERVICE PROCEDURE
No Response From Powertrain Control Module
- If engine runs, go to next step. If engine does not run, see NO START DIAGNOSIS in BASIC DIAGNOSTIC PROCEDURES article in ENGINE PERFORMANCE.
- Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. See COMPONENT LOCATIONS . Turn ignition on. Connect a jumper wire between ground and PCM connector C3 terminal No. 30 (Violet/Brown wire). See Figure . Using scan tool, perform CCD BUS test. If scan tool displays BUS SHORT TO GROUND, go to next step. If scan tool does not display BUS SHORT TO GROUND, repair open Violet/Brown wire. Perform BODY VERIFICATION TEST under VERIFICATION TESTS.
- Move jumper wire to PCM connector C3 terminal No. C28 (White/Black wire). Perform CCD BUS test. If scan tool does not display BUS SHORT TO GROUND, repair open in White/Black wire. Perform BODY VERIFICATION TEST under VERIFICATION TESTS. If scan tool displays BUS SHORT TO GROUND, replace PCM. See POWERTRAIN CONTROL MODULE under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST under VERIFICATION TESTS.
Factory Service Tools
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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.
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