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 Wrangler SE, AutomaticFACTORY OEM SERVICE PROCEDURE
No Response From Powertrain Control Module
- If engine does not run, see NO-START DIAGNOSIS in BASIC DIAGNOSTIC PROCEDURES article. If engine runs, turn ignition off. Disconnect Powertrain Control Module (PCM). Turn ignition on. Connect jumper wire between ground and terminal C30 (Violet/Brown wire) on PCM Gray connector. Using scan tool, perform CCD BUS test. If scan tool does not display BUS SHORT TO GROUND, repair open Violet/Brown wire. If scan tool displays BUS SHORT TO GROUND, go to next step.
- Move jumper wire to terminal C28 (White/Black wire) on PCM Gray connector. Perform CCD BUS test. If scan tool does not display BUS SHORT TO GROUND, repair open White/Black wire. If scan tool displays BUS SHORT TO GROUND, replace PCM.
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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