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C256 Pin-16. Needs an oscilloscope to check it properly, although there are some multimeters on amazon wit ha scope feature for a reasonable price. Never tried one though.
95/96 p38 speedo not working
- Thread starter Eugene p123
- Start date
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Datatek
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I can see all my wheels speeds on my launch diagnostics, would it be possible to have a bad abs ecu an still see the wheels speeds on the diagnostic computer. Wiring and plugs are all checking out OK. I currently have clocks away for testing to make sure they are not faulty to eliminate a few things
Datatek
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It would certainly be possible for the wheel speeds to be seen but for the ECU to not produce the required output for the speedo.
Some diagnostics can actually test the instruments, no idea about what you are using.
This is possibly my issue as I have checked the wiring from end to end. Also new becm refurbished to fix previous faults. So down to abs ecu and clocks. I have no abs faults though so I was steered towards clocks but I'm not sure as I would of thought if it was the clocks she would still count the miles but it isn't counting the miles. So I'm back thinking clocks aren't seeing the pulse to make speedo and miles work.
Datatek
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If there are no pulses, it will not count the miles or operate the speedo.
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Plenty of Multimeters on Amazon these day with a simple scope display. Even though I have two proper scopes, was thinking about getting one of these from my Wife as an Easter present !!
Should be good enough to show ABS to BECM & Instruments signals.
Should be good enough to show ABS to BECM & Instruments signals.
brianp38dse
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On your year there are only two different abs ecu`s, no traction control and 2wheel traction control anr4898
Datatek
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I'm waiting for a good one to turn up on AliExpress.
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The number need to match. There are 3 types and they are matched to the brake modulator.
You need to be moving for the ABS sensors to generate a signal. Not sure if early cars can read the speed in diagnostic mode but later ones do as long as you stay slow enough that the light doesn't go out on the dash.
Datatek
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I don't know about Nanocom, but road speed can be seen with Faultmate on more than one screen and the ABS sensors can also be monitored at normal speeds after the ABS light goes out
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Don't think that works on Nanocom with WABCO C module. With WABCO D (4W TC) it is supposed to be possible to get a trace with the Nanocom but only as long as it is in diagnostic mode which is something like below 10 kph.
When I get a chance I will fire up my old PC. I took traces of everything I could with the Nanocom at one stage. I've never played with a WABCO D module though. I know some of the Nanocom outputs were switched around (wrong sides) because Marty mentioned it but that may have been fixed in later software updates.
Datatek
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Road speed can be seen in the auto box module and I think the EDC. It's a long time since I looked so I need to check. I have only ever played with WABCO D and I have Faultmate not Nanocom.
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It can certainly be seen on the EAS module.
