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File In Section: 5 - Brakes
Bulletin No.: 63-50-09
Date: March, 1996
INFORMATION
Subject:
"ETS OFF" Indicator Lamp On with No DTC's Set
Models:
1996 Buick Skylark
1996 Chevrolet Cavalier
1996 Oldsmobile Achieva
1996 Pontiac Grand Am, Sunfire
On vehicles equipped with Enhanced Traction System (ETS), the "ETS
OFF" indicator lamp may come on and ETS and Cruise Control might become
disabled. There may be no ABS or PCM Diagnostic Trouble Codes (DTC's)
stored and there may be no "Check Engine" lamp on. This condition has
caused a high rate of unnecessary IPC replacements.
The PCM sets a Type "C" or "D" FAILURE RECORD which sends a message to the
Electronic Brake Control Module (
EBCM)
to turn the "ETS OFF" indicator on and to disable ETS. The PCM can then
disable Cruise Control, but may not turn on a corresponding "Check
Engine" lamp. These Type "C" or "D" Failure Records are not stored in
the normal Current or History menus.
The technician is instructed to check normal operation of the "ETS
OFF" switch and the ETS system. The technician is then instructed to
check for Failure Records and directed to Section 6E3-A of the Service
Manual, see chart. When the PCM Failure Record is corrected, normal
operation of the ETS system and Cruise Control should return.
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