Circuit Description
Each control module runs a program that tests its ability to write to the electrically erasable programmable read-only memory (EEPROM). No external circuits are involved. The module writes information to a data block in the EEPROM. The module then reads the data and compares it to what was sent to the data block. If the data does not match after 3 consecutive attempts, that control module may set DTC B1007.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B1007 EEPROM Write Error
Conditions for Running the DTC
| • | The control module has power and ground. |
| • | The ignition is ON. |
Conditions for Setting the DTC
The control module detects an EEPROM write error.
Action Taken When the DTC Sets
The module writes to another area of the EEPROM. This becomes the new permanent area to store the data. The data location is allowed to change until all of the available EEPROM is used. If a B1004 DTC is also set, the module reverts to base operation values programmed for those blocks of data that have failed. The blocks of data that have not failed the checksum test are not affected.
Conditions for Clearing the DTC
| • | A current DTC clears when the malfunction is no longer present. |
| • | A history DTC clears when the ignition has been cycled 100 times 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. |
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Diagnostic System Check for the system exhibiting the symptom? | Go to Step 2 | Go to Control Module References for the applicable Diagnostic System Check |
2 |
Is DTC B1007 retrieved as a current DTC? | Go to Step 3 | Go to Diagnostic Aids |
3 |
Important: Perform the programming or setup procedure for the module, if required. Replace the control module setting DTC B1007 as current. Refer to Control Module References . Did you complete the replacement? | Go to Step 4 | -- |
4 |
Does DTC B1007 reset? | Go to Step 2 | System OK |
