ABS Warning Lamp ON, DTC's 46 and 86 Set
File In Section: 5 - BrakesBulletin No.: 41-50-12
Date: October, 1994
Subject:
Antilock Brake System (ABS)/Brake Warning Indicator Lamp On (Reprogram EBCM)
Models:
1993 Buick Skylark
1993 Chevrolet Beretta, Corsica
1993-1994 Chevrolet Cavalier
1993 Oldsmobile Achieva
1993 Pontiac Grand Am
1993-1994 Pontiac Sunbird
Condition
Some owners may experience an Antilock Brake System (ABS) indicator lamp or brake warning lamp coming on prematurely. This may result in the combination of ABS diagnostic trouble codes 46 and 86 being set.
Correction
Reprogram EBCM using TECH 1 and cartridge.
The Service Technology Group has released a reprogramming procedure for servicing the above-mentioned vehicles with the combination of ABS brake diagnostic trouble codes 46 and 86. This procedure is available in the mass storage cartridge through a CD ROM software release. The following criteria must be met before reprogramming the EBCM:
The combination of DTC 46 and 86 must be present in EBCM memory.
Only vehicles with verified DTC 46 and 86 can be reprogrammed.
Prior to reprogramming, if any diagnostic trouble codes other than 46 and 86 are present, proceed to the vehicle's service manual, SECTION 5E1, for diagnosis of these codes first.
The information required to reprogram the EBCM properly will first be available in the September 1994 CD ROM release. After updating the TECH 1 cartridge and connecting the TECH 1 to the vehicle, select "ABS VI REPRGM" from the Applications menu. The TECH 1 should display the following...
The reprogramming process is started by pressing the "ENTER" key. The ignition key must be in the "run" position (engine off) and the vehicle stopped for the reprogramming to take place. The user is informed by the following screen that the test is in progress.
If the vehicle has previously been reprogrammed, it cannot be reprogrammed again, and the following screens will be displayed on the TECH 1.
Press the "EXIT" key to continue if the above screen is displayed.
If the reprogramming is successful, the operator may hear the motors rehome and will see the following screens displayed on the TECH 1:
Press the "EXIT" key to complete the reprogramming process. If any other problems are encountered during reprogramming, the TECH 1 cartridge will notify the user appropriately.
After reprogramming, clear codes using the 1988-1995 Chassis selection of the Tech 1 Mass Storage Cartridge.
WITH FOOT OFF BRAKE PEDAL, start the engine twice and allow it to run for at least 10 seconds each time. If any codes return (including 46 and 86), proceed to the vehicle's service manual, SECTION 5E1, for further diagnosis.
If there are any questions regarding the usage of this reprogramming procedure or diagnosis of the ABS Vi brake system, please contact Delco Chassis Technical Assistance at 1-800-523-0203.
Warranty Information For vehicles repaired under warranty, use:
Labor Operation Labor Time
H 2504 0.2 Hours