cruise control and abs sensor question - Jeep Commander Forums: Jeep Commander Forum
Electronics / NAV Discussion This section contains discussion about the electronics system and NAV system in the Jeep Commander.

 
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post #1 of 8 (permalink) Old 09-12-2018, 01:36 PM Thread Starter
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cruise control and abs sensor question

Some posts have mentioned that ABS sensor problems can stop the cruise from working. If a sensor or wiring to the sensor was the problem, shouldn't there be an error light and trouble code for the ABS system?

I can turn on the cruise, but trying to set it shuts off the light.
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post #2 of 8 (permalink) Old 09-12-2018, 01:41 PM
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Originally Posted by johnc View Post
Some posts have mentioned that ABS sensor problems can stop the cruise from working. If a sensor or wiring to the sensor was the problem, shouldn't there be an error light and trouble code for the ABS system?

I can turn on the cruise, but trying to set it shuts off the light.
That sounds to me, like you could have a short or ground somewhere and that will not necessarily generate a DTC.

My next question would be do you have a Scanner or Tuner to try & pull DTC's?


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post #3 of 8 (permalink) Old 09-13-2018, 09:29 AM Thread Starter
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No codes on my scanner.
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post #4 of 8 (permalink) Old 09-13-2018, 10:38 AM
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Did you check stored codes? I had two codes pop up and then go away, but since that happened my cruise did not function. Turns out it was a bad TPS, and replacing it restored the cruise. Details here, hope it helps: https://www.jeepcommander.com/forums...401-p0068.html
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post #5 of 8 (permalink) Old 09-13-2018, 07:35 PM Thread Starter
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The cruise light went out, and stayed out. Would not come on again. Restarting had no effect. It would usually come on with just the key on, not running, not this time. My scanner just has a "clear all codes" selection. I used that, and the cruise would turn on again with just the key turned. Cruise light stayed briefly while running. So I suspected the reader was doing something. Then I tried the "key on 3 times" method. The readout showed "p0582". This is "Cruise control vacuum circuit open"
Pulled off the vacuum line to the actuator with the engine off, and there was a whoosh from a vac. reservoir downstream. Started it up, and it seems the suction is not that much. The line feeds off the throttle body, which has 2 electrical devices on it. One is the TPS.
Do they have anything to do with the amount of vacuum to the hose?

The cruise dropping problem started as a sometime thing, and got worse over the last year.
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post #6 of 8 (permalink) Old 09-14-2018, 10:49 AM Thread Starter
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Never mind about the vacuum. I put on a vacuum gauge, and there is plenty, like 23 inches at idle.
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post #7 of 8 (permalink) Old 09-14-2018, 10:58 AM Thread Starter
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Looked up how to troubleshoot the TPS online. The readings I got indicates the TPS is working, but I will have to research the readings for proper parameters. Just for grins, I fired it up with the TPS disconnected. Ran ok, but got a CEL with a generic code (p0123). Got other warning lights for the ESP as well.
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post #8 of 8 (permalink) Old 09-14-2018, 12:26 PM
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Quote:
Originally Posted by johnc View Post
Looked up how to troubleshoot the TPS online. The readings I got indicates the TPS is working, but I will have to research the readings for proper parameters. Just for grins, I fired it up with the TPS disconnected. Ran ok, but got a CEL with a generic code (p0123). Got other warning lights for the ESP as well.
https://www.jeepcommander.com/forums...ble-codes-dtc/


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