Beretta L4-138 2.3L DOHC QUAD 4 HO MFI VIN A (1994)
Hydraulic Control Assembly - Antilock Brakes: Customer Interest
ABS - Lamp ON/DTC's 42 and 86 Set
FILE IN SECTION: 5 - Brakes
BULLETIN NO.: 53-50-10
DATE: May, 1995
SUBJECT:
Anti-Lock Brake System (ABS) Light On - Diagnostic Trouble Codes (DTC's) 42 and 86 Set (Replace Hydraulic Modulator)
MODELS:
1993-95
Buick Skylark
1993-95
Chevrolet Beretta, Corsica, Cavalier
1993-95
Oldsmobile Achieva
1993-95
Pontiac Grand Am
1993-94
Pontiac Sunbird
1995
Pontiac Sunfire
CONDITION
Some owners may comment that the Anti-Lock Brake System (ABS) light remains on. Diagnostic Trouble Codes (DTC's) 42 and 86 will be set. DTC's
will usually set 5 to 8 drive cycles in a row and then become history codes.
CAUSE
DTC's will be set due to a momentary delay within the ABS hydraulic modulator.
CORRECTION
Important:
If DTC 42 is current DTC, the Diagnostic Trouble Tree in Section 5E1 of the Service Manual will lead to replacement of the motor pack. If the
following diagnosis does not lead to replacement of the hydraulic modulator, then the motor pack should be replaced.
Diagnosis
^
If DTC 42 has set 10 or less drive cycles and is no longer a current code (ABS not operating, ABS indicator off), replace the hydraulic modulator.
^
If DTC is current, cycle the system by starting the engine with your foot off the brake pedal. If the ABS indicator remains on, turn the ignition off and
repeat the procedure. If within 10 cycles the ABS indicator is off and the code is no longer current, replace the hydraulic modulator.
^
If the above diagnosis does not lead to replacement of the modulator, follow DTC 42 Trouble Tree in Section 5E1 of the Service Manual.
Repair Procedure
If the condition is confirmed through the above diagnosis, the hydraulic modulator must be replaced, P/N 18023364. This is a new part number that has
been released. Do not use previously released hydraulic modulator part numbers. Refer to Section 5E1 of the Service Manual for hydraulic modulator
replacement procedure.
Parts are currently available from GMSPO.
WARRANTY INFORMATION
For vehicles repaired under warranty, use:
Labor
Operation
Labor Time
H2518
Use published labor operation time.
