So this past weekend I decided to tackle an annoying slow coolant leak. Indications were it was coming from somewhere under or around the throttle body.
I pulled the TB only to find the coolant was coming from under the SC. Deeper inspection showed it was coming from the bypass hose up by the water pump.

So now you know the back story.

I put everything bak together and for two days all was good. Today the cruise control will not turn on. No power light and will not set.

So I pulled the intake hoses and inspected the connectors on the TB. found the upper one on the right side was not fully engaged. I cleaned it and made up the connection.

Still no cruise. The light on the power switch will flash one time when the key is turned on, but after that nothing.

Any ideas?

The car is an '02 XJR.

 

It would help if you put the MY in the body or signature. Since you have an AJ27, the cruise is all electronic, not vacuum motor like the AJ26, so I would make sure all the plugs are tight, then do a hard boot.

 

Sorry about that I was typing on the iPad early this morning and was tired after chasing problems yesterday on the car.

It is a '02 XJR.

 

There are a number of OBD II codes that will disable the cruise control. Check the codes set even if you do not have a CEL.

 

I figured we were not talking about the softail!

 

LOL No that is easy to work on. No computer, only 1 sensor. So easy to fix even I can do it.

 

Hey guys. I borrowed a code scanner from a co-worker that had the 02 XJR listed in its database. There were 3 codes, P0171, P0174 and C1165.
The P codes are bank 1 and 2 too lean. The C1165 if my research is correct indicates the Right Rear Wheel sensor is the problem. Can anybody confirm?

Also the code scanner I have, ACTRON 9580 will not clear the ABS code. So that leads me to believe the C1165 may not be correct.

I was going to jack up the car, and swap the RR and LR wheel sensors and see if I can get the code to change.

Any other thoughts?

 

Found the problem. There was a wheel sensor disconnected.

That fixed the cruise. Now onto the TRAC and ACS not avail readings.

I read all the resistance readings on the wheel sensors and their reading good.

On to the controller.

 

The common fault is the ABS module motor power pins on the circuit board.
I just replace BOTH of my XJ8s ABS modules.

One is the JLM21323 2000MY> and the other is the JLM20555 1999MY.

I have boxes full of modules with DTC C1095 so I just cut the cases open and re-solder the pins.

If I ever find a module with a network fault I SCRAP the module!!!!
I don't know what section of the module to mess with if it fails with anything other than a C1095.

There is info everywhere on the internet about re-soldering the pins so you might try that as a cure or at least preventative maintenance.

I think the 'wave soldering' process in manufacture might not heat the pins enough for a solid, long lasting circuit. They are ALWAYS cracked on the board. Maybe it is not enough solder for the mechanical vibrations of the motor pins?????????

Without a reading of the ABS module you will not be sure of the fault but the re-solder won't hurt.

bob gauff

 

Planning on pulling module either tomorrow after work or Wednesday since it is me short day.

I'll let you know what I find

 

I think I have found the problem with my ABS.

Take a look: Here are the before and after pics.

I put the module back in long enough to test and the ABS light went out right away.