B1004

DTC B1004

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

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B1004 Electronic Control Unit Identification Circuit

CONDITIONS FOR RUNNING THE DTC
The module microprocessor must be active/awake.

CONDITIONS FOR SETTING THE DTC
This DTC indicates the keep alive memory (KAM) in the module has been reset. It is a normal occurrence when battery positive voltage or ground is removed from the module, such as a battery disconnect.

ACTION TAKEN WHEN THE DTC SETS
The microprocessor reverts back to the base programmed critical operating data until new data is learned and stored in KAM.

CONDITIONS FOR CLEARING THE DTC
- A current DTC clears when the malfunction is no longer present.
- A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.

DIAGNOSTIC AIDS
- This DTC 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 this DTC is retrieved as both a current and history DTC, replace the module.

TEST

Steps 1 - 4: