I have had a niggling fault in my JK for about the last 20,000km. Jeep has been unable to identify the problem because every time my Jeep is in for service the fault goes away! D'oh and this has really hacked me offffffff! - because the fault is;
3 yellow lights of death - fishtail, ABS and ESP and when these lights come on the cruise control won't work.
NO Cruise control for me is extremely frustrating let me explain..... when driving home from the Cape i was trying to avoid getting a speeding fine (QLD mobile speed cameras have only 1 or 2km tolerance and no warning signs) so I was driving @ 100kph 2 seconds looking at the road and 1 sec looking @ the speedo so you can imagine my fatigue with only a 3 sec loop. I got tired so I slowed down to 95kph to avoid the 3 second fatigue cycle and soon realised that this speed is more dangerous than 130kph.... let me explain..... big trucks drive right on your @ss and try to pass you in dangerous places. so now i am getting very pissy about the lack of cruise control.... I was actually happy to get into school holiday traffic just so I could just sit and steer again.
I was driving around Sydney on monday when the 3 lights of death came on so I rushed over to my favourite Jeep Dealer service (Artarmon) and asked Riz (worlds best service manager) if he could quickly plug in to my Jeep his scan gauge and and whilst the fault was there diagnose it. SADLY his scan tool was getting new software loaded into it and this would take a day or so D'OH. I then went to Mosman Jeep Service and thankfully the fault lights were still on when I got there and they were able to tell me that the fault was coming from the front drivers side speed sensor - of course they didnt have 1 in stock so I ordered one from melbourne! ($55 bux)
Replacing the drivers side front speed sensor is a fairly easy and straight forward job took me 30 min - you will need a 21mm spanner to release the disc brake assembly and a 13 (I think) to remove the 3 unusual shaped bolts that hold the hub / unit bearing - you will need to pull out the front drivers side drive shaft just an inch or 2 to allow you to get the speed sensor out around the disc brake protector plate / dust deflector and an allen key to release the sensor itself.
1. Jack up Jeep (Safely)
2. Remove wheel
3. Remove disc brake assembly
4. Remove 3 bolts that hold the unit bearing / front hub
5. Pull driveshaft out a couple of inches (30 - 40mm)
5. Using an allen key remove bolt from speed sensor and gently prise up and out the speed sensor
6. Carefully remove the speed sensor wiring clips etc so the wiring is all free
7. TIP I couldn't reach the plug to unplug the old speed sensor so heres what I did - I carefully pulled the old speed sensor of the rear of the shock tower - all you have to do is pull gently its only held with soft christmas trees - and feed it forward towards the radiator until you can easily see and unplug the old sensor -its one of those stupid jeep locking plugs * be careful the plastic will probably be brittle from the engine bay heat - you don't want to brake the special locking system. unplug old sensor
8. Connect new sensor
9. feed the sensor and wiring back the same way you pulled the old on out
10. push the new sensors plug christmas trees into the rear of the shock tower.
11 Reverse steps 1-5.
I jumped into the drivers seat and started my jeep up all excited to see the 3 yellow lights now off and damnit they were still on D'oh - thankfully after driving for about 50meters the 3 lights went out and I havent seen them since and the cruise control now works faultlessly! YAAAAA
I fully expected to find some evidence to suggest the old speed sensor was dead - previously (Sunday night when I got home from the Cape) I pulled out the speed sensor to see if it was dirty etc and it was immaculately clean, so when I pulled the sensor out this arvo I expected to find some physical damage to the cable / sensor...... I closely examined the sensor and every mm / inch of the wiring and no visible damage at all - my suspension doesnt put any strain on the wiring even at full droop so I dont expect to find internal cable damage - there will be a post mortem LoL - I havent had chance to put a meter over it yet (I will soon) but to my eye the old sensor looks just fine
If I can do it you can too - cheers Hunty