Enabling/Set Conditions And Possible Causes - RDM Faults

THE DTC DESCRIPTIONS WITH T-CASE MOTOR AND T-CASE CLUTCH PRESSOR SENSOR CALLED OUT ARE USED FOR THE REAR DRIVE MODULE HYDRAULIC PUMP AND PRESSURE SENSOR ON THIS SYSTEM.

RDM SYSTEM ENABLING CONDITIONS AND FAULT SETTING CRITERIA:

The RDM hydraulic pump and pressure sensor circuit faults have these shared Monitoring Conditions:

With the ignition on.
Battery voltage between 6.0 and 16.0 volts for more than 500 ms.
Engine is not cranking.
No battery or charging system faults present.

Additional Monitoring Conditions for Hydraulic Pump Circuit faults (C104B-11, C104B-12, C104B-13):

Rear Driveline Module (RDM) Hydraulic Pump Motor is commanded off.

FAULT SETTING CRITERIA
(C104B-11, C104B-12, C104B-13) - Hydraulic Pump Circuit Faults	Circuit Low - Voltage on one of the RDM Hydraulic Pump Motor Control circuits is below 0.032 volt for more than 1 second. Circuit High - Voltage on one of the RDM Hydraulic Pump Motor Control circuits is above 5.8 volts for more than 1 second. Circuit Open - Both of the following conditions are present of more than 1 second: Voltage on the RDM Hydraulic Pump Motor Control A circuit is between 2.81 and 3.71 volts. Voltage on the RDM Hydraulic Pump Motor Control B circuit is less than 0.032 volt.
(C1040-11, C1040-12) - Pressure Sensor Circuit Faults	Circuit Low - The DTCM detects that the pressure sensor signal circuit voltage is below 0.05 volts for one second. Circuit High - The DTCM detects that the pressure sensor signal circuit voltage is above 4.85 volts for one second.
(C1040-1C) - Pressure Sensor Circuit Fault	Either of the following conditions is true for more than one second: Voltage on the 5-Volt Supply circuit is below 4.92 volts. Voltage on the 5-Volt Supply circuit is above 5.08 volts.
(C1477-4B, C1472-92) - RDM Clutch Overtemp Faults	Any of the following conditions are true for more than 10 ms: Calculated RDM Clutch temperature is 140°C (284°F) for 60 minutes. Calculated RDM Clutch temperature is 175°C (347°F) for 40 minutes. Calculated RDM Clutch temperature is 200°C (392°F) for 20 minutes. Calculated RDM Clutch temperature is 225°C (437°F) for 0 minutes. C1472-92 - Sets when the Clutch Over-Temperature diagnostic test has failed 10 times during the same ignition cycle.

POSSIBLE CAUSES - MOTOR CONTROL
HYDRAULIC PUMP MOTOR CONTROL A CIRCUIT OPEN OR SHORTED TO BATTERY/GROUND
HYDRAULIC PUMP MOTOR CONTROL A CIRCUIT OPEN OR SHORTED TO BATTERY/GROUND
FAULTY HYDRAULIC PUMP
FAULTY DRIVETRAIN CONTROL MODULE (DTCM)

POSSIBLE CAUSES - PRESSURE SENSOR
PRESSURE SENSOR 5-VOLT SUPPLY CIRCUIT OPEN OR SHORTED TO GROUND
PRESSURE SENSOR SIGNAL CIRCUIT OPEN/HIGH RESISTANCE, OR SHORTED TO BATTERY/GROUND
PRESSURE SENSOR GROUND CIRCUIT OPEN/HIGH RESISTANCE
FAULTY PRESSURE SENSOR
FAULTY DRIVETRAIN CONTROL MODULE (DTCM)

POSSIBLE CAUSES - OVERTEMP
MECHANICAL BINDING INSIDE THE ASSEMBLY - PTU OR RDM
RDM NOT SPINNING UP PROPELLER SHAFT SPEED DURING ENGAGEMENT
RDM CLUTCHES SLIPPING

Default Actions:

ALL WHEEL DRIVE (AWD) WARNING INDICATOR: On, except for overtemp fault.
ELECTRONIC VEHICLE INFORMATION CENTER (EVIC) MESSAGE: AWD System Service Required.
PTU SHIFTING: PTU will continue attempting to perform shifts between FWD and AWD.
REAR DRIVELINE MODULE (RDM) CLUTCH: Normal operation unless fault occurred during shift-in-progress.