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.
2005 Jeep TJ (CANADA) L4-2.4LFACTORY 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
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 shields from over four electrical connectors. Shields snap to connectors.
3. Carefully unplug four electrical connectors (3) from PCM.
4. Remove three PCM mounting bolts (1) or (2) and remove PCM from vehicle.
INSTALLATION
1. Install PCM and three mounting screws to vehicle.
2. Tighten screws to 4 N.m (35 in. lbs.).
3. Check pin connectors in PCM and four electrical connectors for corrosion or damage. Also check pin heights in connectors. Pin heights should all be the same. Repair as necessary before installing electrical connectors.
4. Install four electrical connectors (3) to PCM.
5. Install plastic shield to electrical connectors. Shields snap to connectors.
6. Install battery cable.
7. Use a scan tool to reprogram new PCM with vehicles original Vehicle Identification Number (VIN) and original vehicle mileage.
REMOVAL
PCM Mounting - Left Hand Drive:
PCM Mounting - Right Hand Drive:
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 shields from over four electrical connectors. Shields snap to connectors.
3. Carefully unplug four electrical connectors (3) from PCM.
4. Remove three PCM mounting bolts (1) or (2) and remove PCM from vehicle.
INSTALLATION
1. Install PCM and three mounting screws to vehicle.
2. Tighten screws to 4 N.m (35 in. lbs.).
3. Check pin connectors in PCM and four electrical connectors for corrosion or damage. Also check pin heights in connectors. Pin heights should all be the same. Repair as necessary before installing electrical connectors.
PCM Mounting - Left Hand Drive:
PCM Mounting - Right Hand Drive:
4. Install four electrical connectors (3) to PCM.
5. Install plastic shield to electrical connectors. Shields snap to connectors.
6. Install battery cable.
7. Use a scan tool to reprogram new PCM with vehicles original Vehicle Identification Number (VIN) and original vehicle mileage.
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:
- • 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.