Circuit Description
DTC C1282 allows the EBCM/EBTCM to inspect for a calibration malfunction by comparing the calibration value to a known value (checksum). The EEPROM stores the checksum.
DTC C1282 also acts as a security measure to prevent improper use of calibrations or changes to these calibrations. Improper calibrations may alter the designed function of ABS/ETS/TCS
Conditions for Setting the DTC
DTC C1282 can set any time after the ignition is turned to the Run position.
A malfunction exists if the program identifier is incorrect or the memory checksum is incorrect.
Action Taken When the DTC Sets
| • | A malfunction DTC stores. |
| • | The ABS/ETS/TCS disables. |
| • | The amber ABS/ETS/TCS warning indicator(s) turn on. |
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists and the Scan Tool Clear DTCs function is used. |
| • | 100 drive cycles pass with no DTC(s) detected. |
Diagnostic Aids
A bad cell in the EEPROM that is sensitive to temperature changes may cause an intermittent DTC C1282. If DTC C1282 sets more than once, but is intermittent, replace EBCM/EBTCM.
Use the enhanced diagnostic function of the Scan Tool in order to measure the frequency of the malfunction. Refer to the Scan Tool manual for the procedure.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Diagnostic System Check performed? | -- | Go to Diagnostic System Check | |
2 |
Do not start the engine. Is DTC C1282 set as a current DTC? | -- | ||
3 | Replace the EBCM/EBTCM. Is the repair complete? | -- | Go to Diagnostic System Check | -- |
4 | The malfunction is intermittent or is not present at this time. Is the repair complete? | -- | Go to Diagnostic Aids | -- |
