Enabling/Set Conditions And Possible Causes - Smart Actuator Faults

PTU SYSTEM ENABLING CONDITIONS AND FAULT SETTING CRITERIA

The PTU 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 under voltage or over voltage faults present.
No loss of communication with the PTU/RDM smart actuator fault present.

Additional Monitoring Conditions for Circuit/Performance/Internal/Mismatch faults:

No loss of communication with PTU/RDM smart actuator fault present.

Additional Monitoring Conditions for Circuit/Performance/Internal/Loss of Communication faults:

PROXI Configuration is valid.

FAULT SETTING CRITERIA
(C1495-16/17, C149B-16/17) - Circuit Faults Low/High PTU actuator faults - (C1495-16/17) RDM actuator faults - (C149B-16/17)	The smart actuator detects that the shift fork actuator voltage is above or below a calibrated threshold.
(C1494-92, C1498-92) - Performance Fault (Desired Fork position not reached) PTU actuator faults - (C1494-92) RDM actuator faults - (C1498-92)	The smart actuator detects that the shift fork is not able to achieve the commanded position.
(C1496-92, C1499-92) - Performance Fault (motor position learn failed) PTU actuator faults - (C1496-92) RDM actuator faults - (C1499-92)	The smart actuator position learn routine has failed more than 5 times or an internal failure of the shift fork actuator has been detected.
(C14A7-97, C14A8-97) - Desired Motor Position not reached PTU actuator faults - (C14A7-97) RDM actuator faults - (C14A8-97)	The smart actuator detects that actuator motor is not able to achieve the commanded position.
(C1495-98, C140B-4B, C149B-98) - Smart Actuator Overtemp Faults (temp too high) PTU actuator faults - (C1495-98) RDM actuator faults - (C140B-4B, C149B-98)	PTU smart actuator is overheated due to operation in high ambient conditions or the unit has been operated excessively.
(C1492-00, C1493-00) - Internal actuator performance PTU actuator faults - (C1492-00) RDM actuator faults - (C1493-00)	The smart actuator detects an internal hardware or software issue.
(C2206-00, C2223-00) - Configuration Mismatch fault	The vehicle PROXI configuration is incorrect or an ECU was swapped in from another vehicle.
(U1203-00, U1204-00) - Loss of Communication Fault PTU actuator faults - (U1203-00) RDM actuator faults - (U1204-00)	Will set for one of the following: No messages received from smart actuator for more than 50 ms. No messages received from smart actuator after ignition was turned off for 60 minutes and after the smart actuator was shut down due to an over-temperature condition. (When smart actuator is shut-down due to an over-temp condition and then the customer turns the Ignition off. If ignition has been off for more than 60 minutes, giving the actuator enough time to cool off, then turned back on and the smart actuator still does not communicate, this DTC will set.)

POSSIBLE CAUSES
FUSED B+ SUPPLY TO THE SMART ACTUATOR OPEN/HIGH RESISTANCE OR SHORTED TO GROUND (MOTOR CIRCUIT OR PERFORMANCE FAULTS)
FUSED IGNITION SUPPLY TO THE SMART ACTUATOR OPEN/HIGH RESISTANCE OR SHORTED TO GROUND (LOSS OF COMMUNICATION FAULTS)
GROUND TO THE SMART ACTUATOR OPEN/HIGH RESISTANCE
FLUID LEVEL LOW OR INCORRECT (PERFORMANCE AND OVERTEMP)
MECHANICAL BINDING INSIDE THE ASSEMBLY - PTU OR RDM (PERFORMANCE AND OVERTEMP)
RDM NOT SPINNING UP PROPELLER SHAFT SPEED DURING ENGAGEMENT (PERFORMANCE AND OVERTEMP)
INCORRECT VEHICLE CONFIGURATION/INCORRECT DTCM OR SMART ACTUATOR INSTALLED (MISMATCH FAULTS)
FAULTY SMART ACTUATOR
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.