Original symptoms, Check Engine light came on (car ran fine) I got a OBD1 code reader (led flashing light) and Read the codes.
All were minor codes on pins #20-21-23 All cleared fine.
Problem, after cleared codes, started car and ABS-ASR-BRAKE PAD-BRAKE Lights came on and still had CEL on. Drove car (1/4 mile) and found out it was in LIMP MODE also. I checked all fuses and did reset procedure for ABS by lock to lock on steering wheel. No change. Rechecked codes and found that my LED light would come on faintly on Pin#6 (ABS-ASR CONTROL MODULE N30/1) at (.881v) and would light the LED light at Pin#10 (TCM N15/1) at (4.6mv) What should I do next 1. Disconnect battery? HELP
OBDI was accessed from the 38 pin connector in the engine compartment - but only through the 1995 model year. OBDII started in model year 1996 (on V8s) with a 16 pin connector under the steering wheel. The 38 pin connector in the engine compartment remained for other code reading. What is the 10th digit of your VIN? S specifies a 1995 model, T a 1996 model.
I'd check the insulation between the speed sensor cables and the brake pad sensor cables. Those two cables are packed together and there is a possibility to have some poor insulation when stressed/aged and the leaked current causes your type of problem. Use a multimeter/ohm meter to check the resistance between them.
Pretending it's a 95, but knowing that it's a 96, I would then look for the OBDII port under the steering wheel and read those codes. A 96 has to have an OBDII port - it was government mandated.
Cleared the CHECK ENGINE LIGHT, But still have on ABS, ASR, PADS, AND BRAKE.. lights. My scanner could not read brake system. Should I disconnect battery and try a re-boot or is there a fuse I could pull?
Pulled codes on OBD2 where (MAP sensor) cleared code and started vehicle, did not come back. When I disconnect battery whats the best procedure to re-sync systems?
You need to make sure you have the radio code before the disconnect. When your back up and running, the auto down/up feature on the windows will need to be reset.
Battery disconnected for two days, NO change. and still in limp mode. What scanner besides a star would help clear these codes? And should it be able to scan from the 38pin and the 16pin?
For 1996- it has to be a Star system or clone which means either dealer, MB shop, borrow or buy a clone. There's a nice long thread on Star clones in the 129 forum. I think it's hard to justify a purchase if you have just one car and occasion problem. They are not just costly but also very time consuming.
But keep checking your OBDII codes - see what comes back after you delete. Write down the code number and google it. There could be a clue in the OBDII codes.
FIXED.. I was going over the diagnostic chart and found out I never checked the fuses under the Coffin cover (module coffin) on the passenger side. There was a 15amp fuse blown. Replaced and all fixed.. No lights and no limp mode on. Now I have to get the unlock code for the radio..
Yeah, those coffin box fuses can be a real trip up since they control so many of the modules in there and their sensors! Really should be the first thing you check if you have problems.
I was also baffled why my engine lost power randomly. Turned out to be the wires running to the EGR vacuum valve on the left side of the intake manifold. The plastic connector had disintegrated from the heat, and the wires were shorting. Removed power from one of the LH modules. But DID NOT throw any lights. That turned out to be another problem (plugs inserted upside down in the pod).
Living here in Africa, and having too many fuse failures over the years, I equip all my cars with thermal 15A auto-reset breakers (available from Amazon). Just make pigtails with 1/4" male spade terminals to plug into the fuse sockets. And they are polarized, so that has to be taken into account. These go into critical circuits that will otherwise stop the car from running.
After having this problem with my S600, I made a small board with 4 of these breakers, and a small harness. Then if I have a short again, I just pull over, wait a minute, then I'm on the road again.
May not be the most elegant solution, but I don't have the luxury of waiting for a tow truck on a safe road.
Cheers
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