2002 Jeep Cherokee Oil pressure transducer

TOMLAUR

MEMBER
2002 JEEP CHEROKEE
6 CYL
2WD
AUTOMATIC
125,000 MILES

I have replaced the oil pressure transducer 4 times so far. Failure mode is as engine warms oil pressure gauge goes to zero at idle turning on CHECK GAUGES light. After a few days of this the gauge stays at zero all the time. When I change out the transducer everything works fine for a few weeks, then fails again. After the gauge indicated zero I substituted a mechanical pressure indicator for the transducer and it read 15-20 psi at idle which is normal. Voltage on the 3 leads are 5V, 5V, ground (plug disconnected, engine on). This is driving me nuts. What is going on? I'm about to install a 5th transducer.

Thursday, January 17th, 2008 AT 9:43 AM

1 Reply

TOMLAUR

MEMBER
2 POSTS

Well, I figured it out. There are 3 wires to the transducer- 5 volts, sensor ground, and sensor pressure signal. The sensor signal goes from 0 at 0 pressure to about 2.5 volts at 60 psi. I spliced into these 3 wires and ran them to a voltmeter which I kept in the car while driving. After about 15 minutes the sensor failed (as usual) and I was able to check the voltage levels. Sure enough, the sensor output was bad- another bad sensor. Now, I'm going to the Jeep dealer to do battle again and try to get another replacement. I can't believe I'm the only one with this problem.

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Monday, January 28th, 2008 AT 7:58 AM