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 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 write error. |
| • | The control module detects an internal checksum error. |
Action Taken When the DTC Sets
The microprocessor refuses all additional inputs.
Conditions for Clearing the DTC
| • | The current DTC B1000 will clear when the microprocessor makes a successful write to the EEPROM and checksum maneuver. |
| • | A history DTC B1000 will clear after 100 consecutive ignition switch ON/OFF cycles if the condition for the malfunction is no longer present. |
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. |
Step | Action | Yes | No |
|---|---|---|---|
1 | Preform the Diagnostic System Check for the system exhibiting symptoms. Refer to Control Module References . Did you perform the Diagnostic System Check? | Go to Step 2 | |
2 | Is the DTC received as a current DTC? | Go to Step 3 | Go to Diagnostic Aids |
3 |
Important: Perform the control module programming/configuration procedure if required. Replace the control module. Refer to Control Module References . Did you complete the replacement? | System OK | -- |
