Topic: TPS - should I go Mopar? (Read 11280 times)

JamesH · « **Reply #25 on:** December 06, 2013, 07:47:53 AM »

Mike - I got over excited and ordered a new MAP sensor. If you want some beer money for them I'll still take them for spares and to test on my Dad's XJ that is running a bit crap.

Jonny Jeep · « **Reply #26 on:** December 06, 2013, 06:03:54 PM »

98 TJ/XJ 4.0 O2 sensors are the same. What brand sensors are currently fitted? Jeeps don't seem to like Bosch in general, though I've used them in the past without problems.

JamesH · « **Reply #27 on:** December 08, 2013, 09:44:17 PM »

New MAP sensor fitted, Jeep started and died a couple of times and now won't start. Re-fitted old sensor, still won't start. Fuel gauge and voltmeter don't register when ign turned on. Codes P1698, P1694 and P1685 stored. The first 2 are communication probs in the sensor circuit / BUS, the last is SKIS related

I've read a lot of ideas for next checks but thought I'd post this update just in case anyone had experienced this and can describe the fix.

Chances are it's a wiring or ground fault somewhere but where to start

JamesH · « **Reply #28 on:** December 09, 2013, 10:38:02 PM »

After 2 hours of pissing about with a multimeter I've concluded it's fooked

I've got odd readings, fuses with no power to them and error codes but don't know what it all adds up to.

Ezz · « **Reply #29 on:** December 10, 2013, 05:51:32 AM »

Nightmare James, I feel your pain but I know you'll sort it..

JamesH · « **Reply #30 on:** December 10, 2013, 11:47:37 AM »

If the SKIM detects an invalid key and you start the engine a couple of times and it kills it after 3 secs does it then lock the PCM in some way to the point where it will crank but not fire?

The keys are fine but I have a fault codes for SKIM reading invalid key so thinking maybe the module is shagged and thinks I'm stealing the Jeep.

bigjeepzj · « **Reply #31 on:** December 10, 2013, 12:18:45 PM »

Had a similar problem with the zj
The imobiliser had a fault and need to be replaced
Some times leaving the bat disconnected for a day ment it worked for a bit

JamesH · « **Reply #32 on:** December 10, 2013, 12:31:41 PM »

Was it the immobiliser module in the steering column?

When it went did the Jeep just crank but not start? Any other symptoms?

bigjeepzj · « **Reply #33 on:** December 10, 2013, 05:07:52 PM »

it was the black box behind the light switch on the zj
the ZJ started but would only run when you rev ed it then stopped turning over

JamesH · « **Reply #34 on:** December 10, 2013, 06:21:33 PM »

Useful to know. Did you replace the box and have to get the PCM re-programmed by dealer (or someone else?). Do you have the grey transponder key and SKIS or the other immobiliser type?

Questions, questions, sorry

bigjeepzj · « **Reply #35 on:** December 10, 2013, 07:22:13 PM »

It was 9 years ago and the box was replaced by a auto electrician person but kept the keys
sorry its a bit vage

bigjeepzj · « **Reply #36 on:** December 10, 2013, 07:25:34 PM »

here's a thought have you checked your neutral safety switch
as my bro as a similar prob with the jeep would not crank

donk498 · « **Reply #37 on:** December 10, 2013, 08:06:14 PM »

Bla Bla Bla all I'm hearing is "fook it I'll fit a lexus v8" It will solve the starting problems

JamesH · « **Reply #38 on:** December 10, 2013, 08:41:25 PM »

Quote from: bigjeepzj on December 10, 2013, 07:25:34 PM

here's a thought have you checked your neutral safety switch
as my bro as a similar prob with the jeep would not crank

Jeep cranks fine in P and N just no start and diagnostic codes for SKIM invalid key and 2 CCD-bus non communication codes.

big g · « **Reply #39 on:** December 10, 2013, 08:42:36 PM »

Owt to do with the skis system is a head fuck.

I wish you luck,sir.

JamesH · « **Reply #40 on:** December 10, 2013, 08:43:36 PM »

Quote from: donk498 on December 10, 2013, 08:06:14 PM

Bla Bla Bla all I'm hearing is "fook it I'll fit a lexus v8" It will solve the starting problems

If I can't even fix this electrical problem just imagine all the tech threads I'll be starting if I try and wire one of those up

bigjeepzj · « **Reply #41 on:** December 10, 2013, 09:17:52 PM »

go on fit a Lexus V8 you know you want to

watch the Old iron crews implode heads in

scrw · « **Reply #42 on:** December 10, 2013, 10:24:35 PM »

I had a very similar issue on my old XJ, SKIM code, no starting, power not where is was expected in the relay box, despite not throwing any CPS codes it was the CPS. Trying to remember why I changed it, was result of no power to one of the relays which could only be because of a bad CPS. Can you scope it when its cranking to confirm its good?

bigjeepzj · « **Reply #43 on:** December 10, 2013, 10:44:29 PM »

thats a good point as the CPS could be confusing the ECU

JamesH · « **Reply #44 on:** December 11, 2013, 05:04:09 PM »

I have an old CPS that I changed because I melted the wiring, I'll try fitting that while I'm pissing about with it next.

I don't have a scope to test it but have a few things to investigate now.

JamesH · « **Reply #45 on:** December 11, 2013, 09:30:28 PM »

Just had a couple of hours spare so what did I do...

...read up on swapping a Lexus vvti V8 in

bigjeepzj · « **Reply #46 on:** December 11, 2013, 09:57:07 PM »

Go on lead the way

bigjeepzj · « **Reply #47 on:** December 11, 2013, 10:26:25 PM »

http://www.ebay.co.uk/itm/LS400-Engine-/200998382273?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item2ecc6feac1

scrw · « **Reply #48 on:** December 11, 2013, 10:56:34 PM »

stop it!
These are an easy-ish swap into an MX5 too, did look at doing it to mine, any excuse to keep it....

JamesH · « **Reply #49 on:** January 02, 2014, 04:17:18 PM »

After having left it over Christmas with the battery disconnected it now starts and doesn't have any SKIM codes stored

Still barely running, chugging, bucking and almost stalling so I changed rotor, dist cap, leads and plugs for new and known good spares. No change, plugs all look ok, no obvious odd one out and all the grey ish colour they should be. Changed TPS back to old one, no change. Unplugged O2 while running, slight stumble then carried on as before. Smells like it's running very rich or not burning all fuel.

Getting some codes but very inconsistent, once cleared most don't come back. Last one was P1694, loss of communication with Transmission control unit.

Any ideas where to check next?

Author Topic: TPS - should I go Mopar? (Read 11280 times)

donk498

big g