B1000

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.

TEST

Steps 1-4: