2010 Cadillac CTS Sedan AWD V6-3.6L Page 714
5. Using J 35616-4A - probe , connect a DMM between the clutch coil return circuit, pin B X1 TCCC harness side, and a good ground. Put the
DMM on the audible selection for testing resistance. Using the scan tool special functions, command the clutch return circuit ON. The DMM
should indicate continuity.
瀚慖f the DMM did not indicate continuity, test the clutch coil return circuit for an open, high resistance or a short to voltage. If the circuit
tests normal, replace the TCCM.
6. Using the scan tool special functions, command the clutch return circuit OFF. The DMM should NOT indicate continuity.
瀚慖f the DMM indicates continuity, test the clutch coil return circuit for a short to ground. If the circuit tests normal, replace the TCCM.
7. Using J 35616-5 - probe , test for 2-5 ohms of resistance between TCCC, pins A and B X1 TCCC.
瀚慖f the resistance is not within the specified range, replace the transfer case. Refer to Transfer Case Assembly Replacement (See:
Transmission and Drivetrain/Transfer Case/Service and Repair/Removal and Replacement/Transfer Case Assembly Replacement).
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Control Module References (See: Testing and Inspection/Programming and Relearning)for TCCM replacement, setup, and programming.
* Transfer Case Assembly Replacement (See: Transmission and Drivetrain/Transfer Case/Service and Repair/Removal and
Replacement/Transfer Case Assembly Replacement)
C0400
DTC C0400
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions)provides an overview of each diagnostic category.
DTC Descriptor
DTC C0400
- Transfer Case Clutch Calibration Resistor Circuit
Diagnostic Fault Information
Circuit/System Description
A transfer case will be equipped with one of nine different value transfer case resistors. The resistor value the unit is equipped with is dependent
upon manufacturing tolerances and is a result of end of line testing at the manufacturer. A 5-volt reference is supplied to the resistor, and then it is
read back via the clutch resistor signal circuit giving the module the voltage indicating what resistor value is present. Having the wrong resistor may
cause the system to be less responsive to certain driving situations and also could damage the front axle. Depending on the resistor value used a
customer may never know the system is not performing at optimum efficiency.
Conditions for Running the DTC
* The ignition is ON.
* System voltage is 9-16 volts.
Conditions for Setting the DTC
DTC C0896 is not set.
Action Taken When the DTC Sets
* System performance may be affected.
* No DIC messages will be displayed.
