C1438-TRANSFER CASE DIFFERENTIAL CLUTCH WORN

For a complete wiring diagram Refer to Section 8W.

When Monitored:
The ignition on, engine running. No Under/Overvoltage, and/or encoder error DTCs present. When shifted into 4-Low or in 4-high.
Set Condition:
The Final Drive Control Module is unable to fully lock the T-Case (in Either High or Low) because the T-Case clutch is worn.

Possible Causes

(K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE

(T313) MODE SENSOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

(K594) DRIVETRAIN SENSOR RETURN CIRCUIT OPEN OR HIGH RESISTANCE

TRANSFER CASE CLUTCH WORN

FINAL DRIVE CONTROL MODULE (FDCM)

1.DTC IS ACTIVE

NOTE: Diagnose and repair any system voltage or Transfer Case related DTCs in the FDCM before continuing with this test.

Does this DTC reset?

Yes

2.TRANSFER CASE POSITION SENSOR VOLTAGE

Does the voltage display as described?

Yes

Replace the Transfer Case in accordance with the Service Information.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1 (Refer to 21 - TRANSMISSION/TRANSAXLE/TRANSFER CASE - STANDARD PROCEDURE).

3.TRANSFER CASE POSITION SENSOR VOLTAGE

Is the voltage between 4.8 volts and 5.2 volts?

Yes

Replace the Transfer Case in accordance with the Service Information.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1 (Refer to 21 - TRANSMISSION/TRANSAXLE/TRANSFER CASE - STANDARD PROCEDURE).

4.(K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT HIGH RESISTANCE

Is the resistance above 5.0 ohms?

Yes

Repair the high resistance in the (K504) Drivetrain 5 Volt Supply circuit.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1 (Refer to 21 - TRANSMISSION/TRANSAXLE/TRANSFER CASE - STANDARD PROCEDURE).

5.(T313) MODE SENSOR SIGNAL CIRCUIT HIGH RESISTANCE

Is the resistance above 5.0 ohms?

Yes

Repair the high resistance in the (T313) Mode Sensor Signal circuit.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1 (Refer to 21 - TRANSMISSION/TRANSAXLE/TRANSFER CASE - STANDARD PROCEDURE).

6.(K594) DRIVETRAIN SENSOR RETURN CIRCUIT HIGH RESISTANCE

Is the resistance below 5.0 ohms?

Yes

Replace the Final Drive Control Module in accordance with the Service Information.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1 (Refer to 21 - TRANSMISSION/TRANSAXLE/TRANSFER CASE - STANDARD PROCEDURE).

Repair the high resistance in the (K594) Drivetrain Sensor Return circuit.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1 (Refer to 21 - TRANSMISSION/TRANSAXLE/TRANSFER CASE - STANDARD PROCEDURE).

7.INTERMITTENT WIRING AND CONNECTORS

Were any problems found?

Yes