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.
2002 Jeep TJ (CANADA) L4-2.5LFACTORY OEM SERVICE PROCEDURE
Engine Control Module: Service and Repair
USE THE DRB SCAN TOOL TO REPROGRAM THE NEW POWERTRAIN CONTROL MODULE (PCM) WITH THE VEHICLES ORIGINAL IDENTIFICATION NUMBER (VIN) AND THE VEHICLES ORIGINAL MILEAGE. IF THIS STEP IS NOT DONE, A DIAGNOSTIC TROUBLE CODE (DTC) MAY BE SET.
REMOVAL
The PCM is located in the engine compartment.
To avoid possible voltage spike damage to the PCM, ignition key must be off, and negative battery cable must be disconnected before unplugging PCM connectors.
1. Disconnect negative battery cable at battery.
2. Remove plastic shield from over 32-way connectors. Shield snaps to connectors.
3. Carefully unplug three 32-way connectors from PCM.
4. Remove three PCM mounting bolts and remove PCM from vehicle.
INSTALLATION
1. Install PCM and mounting bolts to vehicle.
2. Tighten bolts to 4 N.m (35 in. lbs.).
3. Check pin connectors in PCM and three 32-way connectors for corrosion or damage. Also check pin heights in connectors. Pin heights should all be the same. Repair as necessary before installing 32-way connectors.
4. Install three 32-way connectors.
5. Install plastic shield to 32-way connectors. Shield snaps to connectors.
6. Install battery cable.
7. Use the DRB scan tool to reprogram new PCM with vehicles original Identification Number (VIN) and original vehicle mileage.
REMOVAL
Fig. 4 PCM Location:
The PCM is located in the engine compartment.
To avoid possible voltage spike damage to the PCM, ignition key must be off, and negative battery cable must be disconnected before unplugging PCM connectors.
1. Disconnect negative battery cable at battery.
2. Remove plastic shield from over 32-way connectors. Shield snaps to connectors.
3. Carefully unplug three 32-way connectors from PCM.
4. Remove three PCM mounting bolts and remove PCM from vehicle.
INSTALLATION
1. Install PCM and mounting bolts to vehicle.
2. Tighten bolts to 4 N.m (35 in. lbs.).
3. Check pin connectors in PCM and three 32-way connectors for corrosion or damage. Also check pin heights in connectors. Pin heights should all be the same. Repair as necessary before installing 32-way connectors.
4. Install three 32-way connectors.
5. Install plastic shield to 32-way connectors. Shield snaps to connectors.
6. Install battery cable.
7. Use the DRB scan tool to reprogram new PCM with vehicles original Identification Number (VIN) and original vehicle mileage.
Factory Service Tools
Use the Manual With the Right Hardware
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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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