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 MANUALSJEEP1991CHEROKEE 2WD L4-150 2.5L VIN P MFIREPAIR AND DIAGNOSISBRAKES AND TRACTION CONTROLANTILOCK BRAKES / TRACTION CONTROL SYSTEMSELECTRONIC BRAKE CONTROL MODULESERVICE AND REPAIRREMOVAL AND INSTALLATION
1991 Jeep Cherokee 2WD L4-150 2.5L VIN P MFI
Removal and Installation
1991 Jeep Cherokee 2WD L4-150 2.5L VIN P MFISECTION Removal and Installation
ECU REPLACEMENT
1. Verify that ignition switch is Off. Then fold rear seat cushion forward for access to Electronic Control Unit (ECU).
2. Remove screws attaching ECU mounting bracket to floorpan riser.
3. Remove screw attaching mounting bracket tab to floorpan.
4. Remove screws attaching ECU to mounting bracket.
5. Unplug ECU harness and remove ECU.
6. Connect harness to replacement ECU.
7. Install replacement ECU on mounting bracket and install ECU attaching screws.
8. Position mounting bracket on floorpan and install attaching screws.
9. Fold rear seat down.
1. Verify that ignition switch is Off. Then fold rear seat cushion forward for access to Electronic Control Unit (ECU).
Fig.37 ECU Mounting Bracket:
2. Remove screws attaching ECU mounting bracket to floorpan riser.
3. Remove screw attaching mounting bracket tab to floorpan.
Fig.38 ECU Connections:
4. Remove screws attaching ECU to mounting bracket.
5. Unplug ECU harness and remove ECU.
6. Connect harness to replacement ECU.
7. Install replacement ECU on mounting bracket and install ECU attaching screws.
8. Position mounting bracket on floorpan and install attaching screws.
9. Fold rear seat down.
RENDER: 1.0x
NO RELATED
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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.