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I recently replaced the CTS (G62, square plug type) on my 99 2.4 V6 30V (Its pretty much the same as the 2.8), as I was having warm start issues, cluster guage never moved from bottom and I had a sticky 16502 / P0118 code.
Code stays gone, cluster guage gets fairly quickly to around 90'C and stays around there unless I push it. The starting issues (cranking fine, takes forever to fire up) seems to come further apart now, but they're not gone. Fuel trim is always adjusting up by 15-25% (worst on idle) - migh be related..?
I decided to let the car sit for 24 hours (ambient temp fairly stable). A control test of ambient temp showed 7.0'C, and the coolant in the expansion tank showed 8.0'C. However, ignintion on, engine off - after 24hrs - ECU part of the CTS is reading -7.5'C and the cluster is reading (+)30.0'C. Intake and ambient temp seems to be fairly good, compared to control.
Any ideas? I'm not in a posistion to be throwing any more parts at it than neccessary right now, so It would be great if someone had a suggestion on how to test if the new CTS is defective (pinout, correct resistance at specified temps etc).
all looks normal on the engine end to me. how cold did it get overnight ? coolant temp wont move nearly as fast as air temp. bet it got in the sub zeros overnight.
not sure about the guage i never look at that one.
I recently replaced the CTS (G62, square plug type) on my 99 2.4 V6 30V (Its pretty much the same as the 2.8), as I was having warm start issues, cluster guage never moved from bottom and I had a sticky 16502 / P0118 code.
Code stays gone, cluster guage gets fairly quickly to around 90'C and stays around there unless I push it. The starting issues (cranking fine, takes forever to fire up) seems to come further apart now, but they're not gone. Fuel trim is always adjusting up by 15-25% (worst on idle) - migh be related..?
I decided to let the car sit for 24 hours (ambient temp fairly stable). A control test of ambient temp showed 7.0'C, and the coolant in the expansion tank showed 8.0'C. However, ignintion on, engine off - after 24hrs - ECU part of the CTS is reading -7.5'C and the cluster is reading (+)30.0'C. Intake and ambient temp seems to be fairly good, compared to control.
Any ideas? I'm not in a posistion to be throwing any more parts at it than neccessary right now, so It would be great if someone had a suggestion on how to test if the new CTS is defective (pinout, correct resistance at specified temps etc).
Temp readings
Fortunately there are several places you can mail your cluster to and they will fix it, including your LCD which is probably pixilated by now anyway.
Since you have a 2.4 V6 you're likely not in the USA so you'll have to find your own cluster repair facility.
OP, if you have vagcom then why don't you do a cluster test in that module?
All the bells and whistles are called up, give it a shot before you throw darts at nothing.
@Airbag: Temps at nighttime got down to about 4'C (plus), 12 in day. Car was sitting in the shade, and test was performed around 10pm (4hrs after sundown) - so not a big gap, and nowhere near sub-zero. As mentioned, the actual ambient (7.09'C) and coolant temp was control tested with a known calibrated temp probe, and coolant read (plus) 8.02'C at the time of the test.
@SloopJohnB@mac.com: What makes you suggest the cluster to be eff'ed? I'd love to send it in to get the display fixed (it fades with certain temp fluctations, but only 1/3 of a single horizontal line is actually buggered), but that gets pretty expensive. Haven't been able to source a specific service, but an electronics workshop guestimated ~1.5hrs work (as its not a procedure they've done before), plus parts. Thats about $200 in work alone here. And I hear those Chinese cheap displays are really s***, which means another 100-200$ in parts.
Shipping it off to the US means a good $100 in shipping (there and back again), so even though cheaper - still looking at $250-$300 job.
@jcman : Thanks a nice, warm bunch of puppys and kittens for the PDF - I've been looking for something like this for days now! That it was an isolated, 2-thermistor package, I already was aware of. Important to understand though. I'm not able to pull the sensor right now, but I'll try to make that happen - maybe later today. I did run an output test on the cluster last night when I got home. Everything seemed fine, but VCDS was reading 91'C on the coolant (cluster) at the time so not the best timing. I'll try another one fairly soon (sitting overnight), and post back.
Ps. I have the analog clock cluster (with integrated immo). Is the oil temp guage supposed to do something during the output test? Because it was sitting steady @ ~85'ish all through the test. Oh, and when it came to the overheat test - nothing happened, and got red letters (VCDS) saying something in the lines of procedure not available.
Pardon the quality - solar eclipse going on in the background so lighting got a bit intense and weird, had to do a quick-n-dirty filter. But it should be good enough to see whats going on. The speedometer stops at ~102km/h, I can live with that. The fuel guage can be adjusted a little bit - but I'll tackle that after dealing with fuel sender issues.
03-18-2015, 08:10 PM
New CTS, temp readings way off
That it was an isolated, 2-thermistor package, I already was aware of. Important to understand though. I'm not able to pull the sensor right now, but I'll try to make that happen - maybe later today. I did run an output test on the cluster last night when I got home. Everything seemed fine, but VCDS was reading 91'C on the coolant (cluster) at the time so not the best timing. I'll try another one fairly soon (sitting overnight), and post back.