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 DIAGNOSISWIPER AND WASHER SYSTEMSTESTING AND INSPECTIONWASHER SYSTEMFRONT
1991 Jeep Cherokee 2WD L4-150 2.5L VIN P MFI
Front
1991 Jeep Cherokee 2WD L4-150 2.5L VIN P MFISECTION Front
NONINTERMITTENT
1. Unplug Washer Pump Connector.
- Measure resistance between terminal A at pump and a clean chassis ground. Meter should read zero ohms. If not, repair open to ground.
2. Turn ignition switch to ACCY and washer switch to ON.
- Measure voltage at washer pump connector terminal B. Meter should read battery voltage. If OK, replace washer pump. If not, go to next step.
- Measure voltage at wiper washer switch connector terminal B. Meter should read battery voltage. If OK, repair open to washer pump. If not, replace switch.
INTERMITTENT
1. Unplug Washer Pump Connector.
- Measure resistance between terminal A at pump and a clean chassis ground. Meter should read zero ohms. If not, repair open to ground.
2. Turn ignition switch to ACCY and washer switch to ON.
- Measure voltage at wipe module terminal B (pink wire). Meter should read battery voltage. If not, replace wiper switch.
- Measure voltage at wipe module terminal B (violet wire). Meter should read battery voltage. If not, replace module.
- Measure voltage at washer pump connector terminal B at pump. Meter should read battery voltage. If OK, replace pump. If not, repair open from Wiper Module.
1. Unplug Washer Pump Connector.
- Measure resistance between terminal A at pump and a clean chassis ground. Meter should read zero ohms. If not, repair open to ground.
2. Turn ignition switch to ACCY and washer switch to ON.
- Measure voltage at washer pump connector terminal B. Meter should read battery voltage. If OK, replace washer pump. If not, go to next step.
- Measure voltage at wiper washer switch connector terminal B. Meter should read battery voltage. If OK, repair open to washer pump. If not, replace switch.
INTERMITTENT
1. Unplug Washer Pump Connector.
- Measure resistance between terminal A at pump and a clean chassis ground. Meter should read zero ohms. If not, repair open to ground.
2. Turn ignition switch to ACCY and washer switch to ON.
- Measure voltage at wipe module terminal B (pink wire). Meter should read battery voltage. If not, replace wiper switch.
- Measure voltage at wipe module terminal B (violet wire). Meter should read battery voltage. If not, replace module.
- Measure voltage at washer pump connector terminal B at pump. Meter should read battery voltage. If OK, replace pump. If not, repair open from Wiper Module.
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.