Enabling/Set Conditions And Possible Causes - RDM System Performance Faults

IMPORTANT DTC DESCRIPTION INFORMATION: 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 PERFORMANCE FAULTS - ENABLING CONDITIONS AND FAULT SETTING CRITERIA: The RDM system 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.
No Rear Driveline Module Hydraulic Pump Motor circuit DTCs.
No Pressure Sensor circuit DTC.
RDM Hydraulic Pressure Sensor signal is within normal operating range.

FAULT SETTING CRITERIA
(C1415-92 - Performance Fault - hydraulic pump performance)	Any of the following conditions are true: Condition 1: Voltage on RDM Hydraulic Pump Motor circuits is greater than 3.0 volts with the motor being commanded and the calculated torque applied is less than 100 Nm for 15 seconds. Condition 2: Current on RDM Hydraulic Pump Motor is more than 1.0 amps with the motor not commanded to operate. Condition 3: Current on RDM Hydraulic Pump Motor is less than a calibrated threshold with the motor being commanded to operate.
(C1440-64 - Performance Fault - pressure sensor performance)	One of the following conditions is true: With the hydraulic pump commanded off for more than 5.0 seconds, the pressure sensor signal is indicating a pressure of more than 100ka (14.5 psi). Too Large Torque Error Detection: The difference between the torque command and the estimated torque from pressure sensor reading is larger than 200Nm for more than 15.0 seconds.

FAULT SETTING CRITERIA

(C1415-92 - Performance Fault - hydraulic pump performance)

Any of the following conditions are true:

Condition 1: Voltage on RDM Hydraulic Pump Motor circuits is greater than 3.0 volts with the motor being commanded and the calculated torque applied is less than 100 Nm for 15 seconds.
Condition 2: Current on RDM Hydraulic Pump Motor is more than 1.0 amps with the motor not commanded to operate.
Condition 3: Current on RDM Hydraulic Pump Motor is less than a calibrated threshold with the motor being commanded to operate.

(C1440-64 - Performance Fault - pressure sensor performance)

One of the following conditions is true:

With the hydraulic pump commanded off for more than 5.0 seconds, the pressure sensor signal is indicating a pressure of more than 100ka (14.5 psi).
Too Large Torque Error Detection: The difference between the torque command and the estimated torque from pressure sensor reading is larger than 200Nm for more than 15.0 seconds.

POSSIBLE CAUSES - PERFORMANCE FAULTS
HYDRAULIC FLUID LEVEL LOW - LEAKING
HIGH RESISTANCE IN THE PRESSURE SENSOR SIGNAL CIRCUIT
HIGH RESISTANCE IN THE PRESSURE SENSOR GROUND CIRCUIT
MOTOR A CONTROL CIRCUIT OPEN/HIGH RESISTANCE
MOTOR B CONTROL CIRCUIT OPEN/HIGH RESISTANCE
FAULTY PRESSURE SENSOR
FAULTY HYDRAULIC PUMP
FAULTY DRIVETRAIN CONTROL MODULE (DTCM)

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.