B1000 - ECU Malfunction

Diagnostic Chart:

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 an internal fault when power up is commanded. The only requirements are voltage and ground.

CONDITIONS FOR SETTING THE DTC
^ The control module detects an internal memory (write error) malfunction.
^ The control module detects an internal memory (checksum error) malfunction.

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

CONDITIONS FOR CLEARING THE MIL/DTC
^ The current DTC B1000 will clear when the microprocessor makes a successful write to the EEPROM and check sum maneuver.
^ A history DTC B1000 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
^ Use a scan tool in order to clear the DTC.

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.