Eng. Code P0118... - JeepForum.com
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post #1 of 2 Old 11-30-2006, 01:24 PM Thread Starter
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1999 XJ Cherokee 
Join Date: Aug 2005
Location: Valdosta, Ga
Posts: 155
Eng. Code P0118...

My XJ (99 4.0L 95,000mi) started running really crappy the past 3 three days (Dieing and taking 5 or 6 long cranks to start after dieing, studdering on accel, and high idle) and my check engine light came on, When i ran the codes i get 'P0118 Engine coolant temp circuit high input'... Besides what it says what is it talking about? How would i check it? and Would that make the jeep stall, studder and then sometimes die? I just receltly found a wired harness that was burned thru about 6 wires but i repaired them, the right way, Also i just recently replaced my Cap, Rotor, Plugs and Wires... Anyone have this problem and know a good solution?

1999 XJ 3.5 RE Super Ride, 31x10.5 Re-treads RE heavy duty track bar, RE Shackles, TBM...

Tire size, its not how big they are, its where you can make them take you...
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post #2 of 2 Old 11-30-2006, 01:26 PM
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There's a probem with the coolant temp sensor or associated circuit. Yes, it would cause the symptoms you're describing. The sensor is located in the thermostat housing. Visually inspect the wires, follow them back, be sure that they don't run through the bundle you repaired. If the wiring looks OK, replace the sensor.

I believe you can turn the key on (engine off), disconnect the sensor, and use a DVOM to probe the terminals on the sensor connector. You should have 5 volts there. If you have more tha 6 volts, there's a short somewhere.

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