A082

Fig. 509 Code 82: Calibration Fault:

Circuit Description:
This DTC allows the EBCM to check for a calibration malfunction by comparing the calibration value to a known value stored in the EEPROM. This DTC is also used as a security measure to prevent improper use of calibrations or changes to these calibrations that may alter the designed function of ABS.

Failure Condition:
DTC AO82 can be set at key-up. If the program identifier is incorrect or the memory checksum is incorrect, a malfunction exists.

Action Taken:
A DTC AO82 is stored ABS is disabled. And the "ABS" indicator is turned on.

Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This step checks to see if the malfunction is present during diagnosis. If present the EBCM is not functioning correctly and must be replaced.

Important
^ At the time of printing 1993 vehicles with ABS-VI were not being field reprogrammed to correct this failure. A service bulletin will be issued when EEPROM reprogramming is authorized.

Diagnostic Aids:
An intermittent DTC, AO82 may be caused by a bad cell in the EEPROM that is sensitive to temperature changes. If DTC AO82 failed more than once but is intermittent replace the EBCM.

The frequency of the malfunction can be checked by using the enhanced diagnostic function of the TECH 1.