DTC B1000

Circuit Description
Each control module runs a program to detect internal memory faults. No external circuits are involved. If a control module detects any type of internal memory fault, that control module may set DTC B1000.

DTC Descriptor
This diagnostic procedure supports the following DTC:

DTC B1000 Electronic Control Unit (ECU) Performance

Conditions for Running the DTC
*The control module has power and ground.
*The ignition is ON.

Conditions for Setting the DTC

DTC B1000 will set if either of the following conditions occur:

*The control module detects an internal write malfunction.
*The control module detects an internal checksum malfunction.

Action Taken When the DTC Sets
Any of the following actions may occur:

The control module refuses all additional inputs.
*The control module requests the malfunction indicator lamp (MIL).
*The check gages chime sounds.

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 is cycled 100 times without a repeat of the malfunction.

Diagnostic Aids
*DTC B1000 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 DTC B1000 is retrieved as both a current and history DTC, replace the module that set the DTC.