ETS OFF Lamp On, No DTCs Set, Cruise Control Disabled
File In Section: 5 - BrakesBulletin 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.