B1000

Diagnostic Chart:

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

CONDITIONS FOR RUNNING THE DTC
The microprocessor runs the program to detect an internal fault when power up is commanded. The only requirements are voltage and ground. This program runs even if the voltage is out of the valid operating range.

CONDITIONS FOR SETTING THE DTC
The microprocessor first writes information to a cell, or address, adds 0.25 to the value, then calculates a check sum. If this check sum minus 0.25 is not equal to the cell value, the module sets the DTC.

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

CONDITIONS FOR CLEARING THE DTC
The DTC clears when the microprocessor makes a successful write to the EEPROM and check sum maneuver.

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.