Circuit Description
The internal fault detection is handled inside the VTD module. No external circuits are involved.
Conditions for Running the DTC
The VTD module runs a checksum program to detect an error in the data stored in the EEPROM periodically. The only requirements are voltage and ground.
Conditions for Setting the DTC
The VTD module detects a checksum error. The module runs the checksum program three times with the data stored in the EEPROM.
Action Taken When the DTC Sets
The microprocessor sets the DTC as current. The microprocessor uses default information for the operations that depend on data stored in EEPROM.
Conditions for Clearing the DTC
| • | The current DTC B1009 will clear when the microprocessor makes a successful checksum calculation with the data stored in the EEPROM. |
| • | A history DTC B1009 will clear after 100 consecutive ignition 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 | Did you perform the Diagnostic System Check for the system exhibiting the symptom? | Go to Step 2 | |
2 |
Is DTC retrieved as a current DTC? | Go to Step 3 | Go to Diagnostic Aids |
3 |
Important: Perform the set up procedure for the VTD module if required. Replace the control module. Refer to Control Module References . Did you complete the replacement? | Go to Step 4 | -- |
4 |
Does the DTC reset? | Go to Step 2 | System OK |
