B1009

CIRCUIT DESCRIPTION
The internal fault detection is handled inside the control module. No external circuits are involved.

CONDITIONS FOR RUNNING THE DTC
The control module runs a program to detect a checksum error in memory when a power mode change is commanded. The only requirements are voltage and ground.

CONDITIONS FOR SETTING THE DTC
The control module detects a checksum error in the internal memory.

ACTION TAKEN WHEN THE DTC SETS
The microprocessor refuses all additional inputs.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The current DTC B1009 will clear when the microprocessor makes a successful checksum maneuver with the EEPROM.
^ A history DTC B1009 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.

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

Steps 1-4: