B1009

DTC B1009

CIRCUIT DESCRIPTION
Each control module runs a program to detect internal memory faults. No external circuits are involved. If an electrically erasable programmable read-only memory (EEPROM) checksum error is detected, that control module may set DTC B1009.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B1009 EEPROM Checksum Mismatch

CONDITIONS FOR RUNNING THE DTC
- The control module has power and ground.
- The ignition is ON.

CONDITIONS FOR SETTING THE DTC
The control module detects an EEPROM checksum malfunction.

ACTION TAKEN WHEN THE DTC SETS
The module reverts to the base operation values programed for those blocks of data that have failed the checksum test. The blocks of data that have not failed the checksum test are not affected.

CONDITIONS FOR CLEARING THE DTC
- A current DTC clears when the ignition is cycled, and the malfunction is no longer present.
- A history DTC clears when the ignition has been cycled 100 times without a repeat of the malfunction.

DIAGNOSTIC AIDS
- This DTC may be stored as a history DTC without affecting the operation of the module. If stored only as a history DTC and not retrieved as a current DTC, do not replace the module.
- If this DTC is retrieved as both a current and history DTC, replace the module.

TEST

Steps 1 - 6: