B1009
CIRCUIT DESCRIPTIONThe EEPROM check sum error detection is handled inside the control module. No external circuits are involved.
CONDITIONS FOR RUNNING THE DTC
The module runs the program in order to detect a check sum error after each power up. The only requirements are voltage and ground. This program runs even if the voltage is out of the valid operating range.
ACTION TAKEN WHEN THE DTC SETS
The module reverts to base operation values programed for those blocks of data that have failed the check sum test. The blocks of data that have not failed the check sum test are not affected.
CONDITIONS FOR CLEARING THE DTC
^ A current DTC clears when the malfunction is no longer present.
^ A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.
DIAGNOSTIC AIDS
^ This DTC may be stored as a history DTC with out 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
