Dodge Ram Truck 1500-2500-3500. Manual — part 56

C1452-REAR DIFFERENTIAL POSITION SENSOR PERFORMANCE (CONTINUED)

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 FDCM VERIFICATION TEST.

No

>> Test Complete.

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DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS

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C1453-REAR DIFFERENTIAL POSITION SENSOR LOW

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DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS

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C1453-REAR DIFFERENTIAL POSITION SENSOR LOW (CONTINUED)

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
The ignition on. Axle Locker Switch in the FR/RR position.

•

Set Condition:
The FDCM detects that the Rear Differential Position Sensor is short low.

Possible Causes

FRONT DIFFERENTIAL POSITION SENSOR

(522) FRONT LOCKER SENSOR SENSE SHORTED TO GROUND

FDCM

Diagnostic Test

1.

ACTIVE DTC

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.
Ignition on, engine not running.

With the DRBIII

T

, read DTCs.

Is the DTC active at this time?

Yes

>> Go To 2

No

>> Go To 5

2.

REAR DIFFERENTIAL POSITION SENSOR 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.
Using the DRBIII

T

, ignition on, monitor the Rear Locker Sensor state.

Disconnect the Rear Locker Solenoid harness connector.

Does the state change on the DRBIII

T

from Locked to Unlocked?

Yes

>> Replace the Rear Locker Solenoid.

Perform FDCM VERIFICATION TEST.

No

>> Go To 3

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DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS

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C1453-REAR DIFFERENTIAL POSITION SENSOR LOW (CONTINUED)

3.

(T527) REAR LOCKER SENSOR SENSE CIRCUIT SHORTED TO GROUND

Turn the ignition off.

Disconnect the FDCM harness connector.

Measure the resistance of the (T527) Rear Locker Sensor Sense cir-
cuit in the FDCM harness connector.

Is the resistance below 5.0 ohms?

Yes

>> Repair the short to ground in the Rear Locker Sensor

Sense circuit.

Perform FDCM VERIFICATION TEST.

No

>> Go To 4

4.

FDCM

NOTE: Before continuing, check the FDCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.

Were there any problems found?

Yes

>> Repair as necessary.

Perform FDCM VERIFICATION TEST

No

>> Replace and program the Final Drive Control Module in accordance with Service Information.

Perform FDCM VERIFICATION TEST.

5.

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 FDCM VERIFICATION TEST.

No

>> Test Complete.

DR/DH

DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS

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