Dodge Ram Truck 1500-2500-3500. Manual — part 1848
C2123–T-CASE/DIFFERENTIAL SWITCH SUPPLY VOLTAGE CIRCUIT HIGH (CONTINUED)
2.
(K77) TRANSFER CASE POSITION SENSE CIRCUIT SHORT TO VOLTAGE
Turn the ignition off.
Disconnect the Transfer Case Position Sensor harness connector.
Disconnect the Final Drive Control Module harness connector.
Measure the voltage of the (K77) Transfer Case Position Sense circuit
at the Transfer Case Position Sensor harness connector.
Is there any voltage present?
Yes
>> Repair the (K77) Transfer Case Position Sense circuit for
a short to voltage.
Perform the FDCM VERIFICATION TEST. (Refer to 3 -
DIFFERENTIAL & DRIVELINE - DIAGNOSIS AND TEST-
ING)
No
>> Go to 3
3.
(K537) LOCKER SWITCH SUPPLY CIRCUIT SHORT TO VOLTAGE
Turn the ignition off.
Disconnect the Axle Lock Switch harness connector.
Turn the ignition on.
Measure the voltage of the (T537) Locker Switch Supply circuit at the
Axle Lock Switch harness connector.
Is there any voltage present?
Yes
>> Repair the (K537) Locker Switch Supply circuit for a short
to voltage.
Perform the FDCM VERIFICATION TEST. (Refer to 3 -
DIFFERENTIAL & DRIVELINE - DIAGNOSIS AND TEST-
ING)
No
>> Go to 4
4.
FINAL DRIVE CONTROL MODULE
View repair.
Repair
Replace the Final Drive Control Module in accordance with the Service information.
Perform the FDCM VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE - DIAGNOSIS
AND TESTING)
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TRANSFER CASE - ELECTRICAL DIAGNOSTICS (POWER WAGON)
DR/DH
C2123–T-CASE/DIFFERENTIAL SWITCH SUPPLY VOLTAGE CIRCUIT HIGH (CONTINUED)
5.
INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.
Look for the data to change or for the DTC to reset during the wiggle test.
Were any problems found?
Yes
>> Repair as necessary.
Perform the FDCM VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE - DIAGNOSIS
AND TESTING)
No
>> Test complete.
DR/DH
TRANSFER CASE - ELECTRICAL DIAGNOSTICS (POWER WAGON)
21 - 1325
C2201-FDCM ECU INTERNAL (FDCM)
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
With the ignition on.
•
Set Condition:
The Final Drive Control Module has detected a failure internal to the controller.
Possible Causes
FINAL DRIVE CONTROL MODULE
1.
FINAL DRIVE CONTROL MODULE
The Final Drive Control Module has detected an internal failure.
View repair
Repair
Replace the Final Drive Control Module in accordance with the Service Information.
Perform the FDCM VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE - DIAGNOSIS
AND TESTING)
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TRANSFER CASE - ELECTRICAL DIAGNOSTICS (POWER WAGON)
DR/DH
U0100-LOST COMMUNICATION WITH ECM/PCM (FDCM)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
•
With the ignition on
•
Battery voltage between 10 and 16 volts
•
IOD fuse installed
•
FCM is configured correctly
•
Set Condition:
Bus messages not received from the ECM/PCM for approximately 2 to 5 seconds.
Possible Causes
CAN B OR CAN C BUS CIRCUITS OPEN OR SHORTED
DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES
FCM NOT CONFIGURED CORRECTLY
ECM/PCM POWER AND GROUND
ECM/PCM
MODULE THAT SET THIS DTC
Diagnostic Test
1.
VERIFY DTC IS ACTIVE
NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.
With the scan tool, read active DTCs.
Is this DTC active?
Yes
>> Go To 2
No
>> Refer to the Stored Lost Communication test procedure. Refer to the table of contents in this section.
2.
CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS
With the scan tool, read all active DTCs from all modules.
NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or igni-
tion related DTCs.
Does the scan tool display any active DTCs to the conditions listed above?
Yes
>> Diagnose and repair the DTC. Refer to the Index for a complete list of the symptoms.
No
>> Go To 3
3.
VERIFY THAT THE ECM/PCM IS ACTIVE ON THE BUS
Turn the ignition on.
With the scan tool, select Network Diagnostics.
Verify that the ECM/PCM is active on the bus.
Is the ECM/PCM active on the bus?
Yes
>> Go To 4
No
>> Refer to the No Response test procedure. Refer to the table of contents in this section.
DR/DH
TRANSFER CASE - ELECTRICAL DIAGNOSTICS (POWER WAGON)
21 - 1327
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