For 1990-2009 cars only
Circuit Description
The internal fault detection 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.
Action Taken When the DTC Sets
The microprocessor refuses all additional inputs.
Conditions for Clearing the MIL/DTC
The DTC clears when the microprocessor makes a successful write to the EEPROM and check sum maneuver.
Diagnostic Aids
Important: For instrument panel module go to DTC B1000 ECU Malfunction in HVAC.
| • | 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. |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check? | -- | Go to Step 2 | |
2 | Replace the module. Refer to Control Module References . Did you complete the replacement? | -- | System OK | -- |
