Dodge Ram Truck 1500-2500-3500. Manual — part 64
C2314-DIFFERENTIAL INDICATOR CONTROL CIRCUIT (CONTINUED)
5.
(T532, T533 or T534) LOCKER ILLUMINATION SENSE CIRCUIT OPEN/HIGH RESISTANCE
Measure the resistance of each of the following circuits between the
FDCM harness connector and the Axle Locker Switch harness connec-
tor.
•
(T532) Locker Open Illumination Sense circuit
•
(T533) Locker Rear Illumination Sense circuit
•
(T534) Locker FR/RR Illumination Sense circuit
Does the ohmmeter indicate each measurement below 5.0
ohms?
Yes
>> Replace the FDCM in accordance with the Service Infor-
mation.
Perform FDCM VERIFICATION TEST.
No
>> Repair the open or high resistance in the Illumination
Sense circuit that indicated the incorrect resistance read-
ing.
Perform FDCM VERIFICATION TEST.
6.
INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
Wiggle test the wiring harness and connectors while checking for shorted and open circuits.
Using the DRBIII
T
, monitor the data related to this circuit while performing the wiggle test. Look for the data to
change or for the DTC to reset.
Were there any problems found?
Yes
>> Repair as necessary.
Perform TRANSFER CASE VERIFICATION TEST.
No
>> Test Complete.
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DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS
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CHECKING FRONT LOCKER SOLENOID OPERATION
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DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS
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CHECKING FRONT LOCKER SOLENOID OPERATION (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
Possible Causes
FRONT LOCKER SOLENOID
(T520) FRONT LOCKER SOURCE CIRCUIT SHORTED TO GROUND
(T520) FRONT LOCKER SOURCE CIRCUIT SHORTED TO FRONT LOCKER RETURN CIRCUIT
FDCM
Diagnostic Test
1.
AXLE OPERATION
CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt
and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on
the harness connector or module. Do not force the assist arm when releasing or installing the harness con-
nector.
Turn the ignition off.
Secure the vehicle by blocking the rear wheels from the front and back.
Lift one front wheel off the ground.
Turn the ignition on.
Place the vehicle in the drive/first gear and transfer case in LOW LOCK.
With the scan tool, actuate the Front Locker Solenoid.
Manually rotate the wheel that is off the ground. The wheel should lock once the dog clutch is aligned.
Stop the actuation of the Front Locker Solenoid.
Manually rotate the wheel that is off the ground. The wheel should turn.
Does the Front Axle operate as described above?
Yes
>> Front Locker Solenoid is operating normally. Test complete.
No
>> Go To 2
2.
FRONT LOCKER SOLENOID OPERATION
NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is
installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to
do so can result in misdiagnoses of the system.
Turn the ignition off.
Disconnect the Front Locker Solenoid harness connector.
Ignition on, engine not running.
Using a 12-volt test light, jump across from the (T520) Front Locker Source circuit and the (T524) Front Locker
Return circuit in the Front Locker harness connector.
With the DRBIII
T
, actuate the Front Locker Solenoid.
Does the test light illuminate and flash on and off?
Yes
>> Inspect the Front Locker Solenoid terminals and connectors for corrosion and/or dirty that may compro-
mise the connection. If OK, replace the Front Locker Solenoid.
Perform FDCM VERIFICATION TEST.
No
>> Go To 3
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DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS
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CHECKING FRONT LOCKER SOLENOID OPERATION (CONTINUED)
3.
(T520) FRONT LOCKER SOURCE CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the FDCM harness connector.
Measure the resistance of the (T520) Front Locker Source circuit at
the FDCM harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the Front Locker Source cir-
cuit.
Perform FDCM VERIFICATION TEST.
No
>> Go To 4
4.
(T520) FRONT LOCKER SOURCE CIRCUIT SHORTED TO (T524) FRONT LOCKER RETURN CIRCUIT
Measure the resistance between the (T520) Front Locker Source cir-
cuit and the (T524) Front Locker Return circuit in the Front Locker
Solenoid harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short between (T520) Front Locker Source cir-
cuit and the (T524) Front Locker Return circuit.
Perform FDCM VERIFICATION TEST
No
>> Go To 5
DR/DH
DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS
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