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 MANUALSJEEP1986CHEROKEE LAREDO, 2D UTILITY, 2.1 B, 4WDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEM2.5L TBI SYSTEMCOMPONENT TESTINGWIDE OPEN THROTTLE (WOT) SWITCH
1986 Jeep Cherokee Laredo, 2D Utility, 2.1 B, 4WD
Wide Open Throttle (Wot) Switch
1986 Jeep Cherokee Laredo, 2D Utility, 2.1 B, 4WDSECTION Wide Open Throttle (Wot) Switch
- Disconnect wiring harness from WOT switch. Connect ohmmeter leads to switch terminals, and manually open and close the switch. When switch is closed, resistance should be infinite. A low resistance should be indicated at wide open position. Test switch operation several times. Replace WOT switch if defective. Reconnect wiring harness.
- With ignition switch "ON", connect voltmeter between pin 6 and pin 7 (ground) of diagnostic connector D2. Voltage should be zero with switch in wide open position and greater than 2 volts in any other position.
- If voltage is always zero, test for short circuit to ground in wiring harness or switch. Check for open circuit between pin 8 of ECU connector and the switch connector. Repair or replace wiring harness as necessary.
- If voltage is always greater than 2 volts, test for an open wire or connector between the switch and ground. Repair as required.
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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.