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| Rear Differential Sensor-Again http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=53941 |
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| Author: | bu2p [ Wed Jun 30, 2010 9:20 pm ] |
| Post subject: | Rear Differential Sensor-Again |
Well, I cleaned the sensor, reinstalled and still have the ABS/Brake lights. I disassembled the connector at the sensor and checked it out. All wire-to-contact connections are great. Reassembled the connector, cable tied it to the sensor, and still have the ABS/Brake lights. I'm now fairly certain that the sensor is bad, again. I guess the next step is to open-up the differential, clean it, refill it, and install a new sensor. This is driving me crazy. |
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| Author: | bugnout [ Wed Jun 30, 2010 9:59 pm ] |
| Post subject: | Re: Rear Differential Sensor-Again |
You don't need to open up the diff to change the sensor, It bolts on from the outside. |
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| Author: | bu2p [ Thu Jul 01, 2010 4:21 pm ] |
| Post subject: | Re: Rear Differential Sensor-Again |
What I was saying, there must be a problem with the differential - causing the sensor to go bad. I figure, checking it internally, I might be able to figure out why they are failing. I believe someone gave a tip on checking the sensor for continuity to determine if it is or isn't bad. I can't find the tip. Can anyone help? |
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| Author: | onthehunt [ Wed Jul 07, 2010 12:52 pm ] |
| Post subject: | Re: Rear Differential Sensor-Again |
Ohm the sensor out. Don't know what the specs are(maybe in the FSM) but if it was open you would know. |
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| Author: | bu2p [ Wed Jul 07, 2010 2:35 pm ] |
| Post subject: | Re: Rear Differential Sensor-Again |
With an ohm-meter, I get a reading of 'infinity'. Sounds like an open to me, unless the reading should be 'high Mega-ohms'. |
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| Author: | bu2p [ Fri Jul 09, 2010 9:27 pm ] |
| Post subject: | Re: Rear Differential Sensor-Again |
Well, I replaced the speed sensor, again (rear differential). The ABS/Brake lights immediately went away. This time, I made some resistance checks on the old and new sensor units. With the ohm-meter connected to the sensor, polarity correct, the OLD sensor reads open. With the ohm-meter connected to the sensor, polarity incorrect, the OLD sensor reads 13 M-ohms to start and gradually builds up to 30.68 M-ohms (after about 10-minutes). This indicates to me, a capacitor charging-up. With the ohm-meter connected to the sensor, polarity correct, the NEW sensor reads open (infinity). With the ohm-meter connected, polarity incorrect, the NEW sensor reads 2.2 M-ohms. The connector on the wiring harness is now secured with a cable tie. I'm wondering if, through vibration, the past sensors went bad because of a poor connection, possibly causing a surge or arc and blowing the sensor. (I'm struggling to find a reason for 4-failures in 2-1/2 years. |
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