need help with trouble codes
Thread Starter
Intermediate
Joined: Jan 2003
Posts: 41
Likes: 0
From: racine wi
need help with trouble codes
my 94 has the following codes, h21, h23, h37. these codes are are in the abs computer system. i have a service abs and a service asr on the dash. any help would be appriciated. thanks
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
Re: need help with trouble codes (JACKSBLK94)
21 & 23 are for the right front wheel sensor - 37 is the left rear sensor. Diagnosis ususally involves a special tool. Other than checking for obvious damage, I wouldn't know what else to recommend.
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
Re: need help with trouble codes (JACKSBLK94)
I don't think so. From what little I know, sensors are an indication of vehicle speed based on voltage signals determined by the air gap between the toothed gears. Traction Control/ABS ECM uses this information to determine if the vehicle is skidding or if a wheel has locked up and pulses the brakes to control wheel spin. It could be the wiring - no or partial signal due to an open or poor mating at a connector or a damaged sensor. I think the 21 will only be generated if the vehicle is moving. The other two can be indicated with the key on or vice versa.
Le Mans Master
Joined: Jul 2002
Posts: 5,818
Likes: 2
From: Alive and well in Burlington NC
Re: need help with trouble codes (SunCr)
21 & 23 are for the right front wheel sensor - 37 is the left rear sensor. Diagnosis ususally involves a special tool. Other than checking for obvious damage, I wouldn't know what else to recommend.
Drifting
Joined: Jul 2002
Posts: 1,273
Likes: 0
From: Olathe, KS USA
Re: need help with trouble codes (Steel Blue 91)
These codes should turn on the Service LTPWS light in the DIC (driver information center). Does the Service LTPWS light come on when you turn the key on? If it does not then the bulb is burnt out or as it was in my case, someone pulled it out :smash: .
Good luck :seeya
Good luck :seeya
Thread Starter
Intermediate
Joined: Jan 2003
Posts: 41
Likes: 0
From: racine wi
Re: need help with trouble codes (C4Crazy787)
the low tire pressure sensor is very interesting? i don't belive i have these....i thought this was an option? do you think someone pulled the bulb on me? this still does not explain the recent service abs and service asr lights?
Drifting
Joined: Jul 2002
Posts: 1,273
Likes: 0
From: Olathe, KS USA
Re: need help with trouble codes (C4Crazy787)
These codes should turn on the Service LTPWS light in the DIC (driver information center). Does the Service LTPWS light come on when you turn the key on? If it does not then the bulb is burnt out or as it was in my case, someone pulled it out
If you don't have the GM service manual get one, http://www.helminc.com best 90$ I've spent!! :seeya
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