Dodge Ram Truck 1500-2500-3500. Manual — part 285
BUS SHORTED TO GROUND (FCM)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Continuously
•
Set Condition:
Anytime the FCM detects a short to ground on the PCI Bus circuit.
Possible Causes
INTERMITTENT SHORT TO GROUND ON THE (D25) PCI BUS CIRCUIT
Diagnostic Test
1.
INTERMITTENT CONDITION
NOTE: For this code to be active, the DRB will not be able to communicate with any modules on the vehicle
(except the PCM/ECM).
NOTE: Clear the code. If this code continues to set and the DRB can still communicate with the FCM, it will
be necessary to replace the FCM.
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT
PUT YOUR HANDS NEAR THE PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The following list may help in identi-
fying the intermittent condition.
With the engine running at normal operating temperature, wiggle the wiring harnesses. This is to try and duplicate
the complete bus failure condition.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
Were any of the above conditions present?
Yes
>> Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)
No
>> Test Complete.
8E - 12
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
DR/DH
EEPROM CHECKSUM FAILURE (FCM)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Continuously
•
Set Condition:
When the EEPROM memory checksum is determined to be incorrect.
Possible Causes
FRONT CONTROL MODULE
Diagnostic Test
1.
ACTIVE DTC
Turn the ignition on.
With the DRB, erase the FCM DTC’s.
Turn the ignition off then turn the ignition on and wait approximately 1 minute.
With the DRB, read the FCM DTC’s.
Did this DTC reset?
Yes
>> Replace the Front Control Module in accordance with the service information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)
No
>> Test Complete.
DR/DH
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
8E - 13
INTERNAL BOOTLOADER CHECKSUM FAILURE (FCM)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Continuously
•
Set Condition:
When the bootloader checksum is determined to be incorrect.
Possible Causes
FRONT CONTROL MODULE
Diagnostic Test
1.
ACTIVE DTC
Turn the ignition on.
With the DRB, erase the FCM DTC’s.
Turn the ignition off then turn the ignition on and wait approximately 1 minute.
With the DRB, read the FCM DTC’s.
Did this DTC reset?
Yes
>> Replace the Front Control Module in accordance with the service information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)
No
>> Test Complete.
8E - 14
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
DR/DH
INTERNAL FLASH MEMORY CHECKSUM FAILURE (FCM)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Continuously
•
Set Condition:
When the flash memory checksum is determined to be incorrect.
Possible Causes
FRONT CONTROL MODULE
Diagnostic Test
1.
ACTIVE DTC
Turn the ignition on.
With the DRB, erase the FCM DTC’s.
Turn the ignition off then turn the ignition on and wait approximately 1 minute.
With the DRB, read the FCM DTC’s.
Did this DTC reset?
Yes
>> Replace the Front Control Module in accordance with the service information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)
No
>> Test Complete.
DR/DH
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
8E - 15
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