Symptom List:
FCM - EEPROM CHECKSUM FAILURE
FCM - INTERNAL BOOTLOADER CHECKSUM FAILURE
FCM - INTERNAL FLASH MEMORY CHECKSUM FAILURE
FCM - PCI BUS INTERNAL - LOOPBACK FAILURE
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be FCM - EEPROM CHECKSUM
FAILURE.
When Monitored and Set Condition:
FCM - EEPROM CHECKSUM FAILURE
When Monitored:
Set Condition: When the EEPROM memory checksum is determined to be incorrect.
FCM - INTERNAL BOOTLOADER CHECKSUM FAILURE
When Monitored:
Set Condition: When the bootloader checksum is determined to be incorrect.
FCM - INTERNAL FLASH MEMORY CHECKSUM FAILURE
When Monitored:
Set Condition: When the flash memory checksum is determined to be incorrect.
FCM - PCI BUS INTERNAL - LOOPBACK FAILURE
When Monitored:
Set Condition: When a loopback test has failed.
POSSIBLE CAUSES
INTERNAL FAILURE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, erase FCM DTC’s.
Turn the ignition off then turn the ignition on and wait approximately 1 minute.
With the DRB, read FCM DTC’s.
Did this DTC reset?
All
Yes → Replace the Front Control Module in accordance with the service
information.
Perform BODY VERIFICATION TEST - VER 1.
No → Test Complete.
257
COMMUNICATION
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