Pinpoint Test C: DTC U0415
Four Wheel Drive (4WD) Systems
Pinpoint Tests
Pinpoint Test C: DTC U0415
Refer to Wiring Diagram Set 34 (Fusion/Milan/MKZ, Fusion Hybrid/Milan Hybrid), All Wheel Drive (AWD) for schematic and connector information. Diagrams By Number
Normal Operation
The All-Wheel Drive (AWD) system uses data from other systems as inputs to the 4X4 control module. The 4X4 control module uses the inputs to determine the appropriate duty cycle to send to the Active Torque Coupling (ATC) solenoid (part of rear axle) that delivers the desired torque to the rear wheels. Specific inputs to the 4X4 control module are: accelerator pedal position output from the PCM, transmission range from the PCM or Transmission Control Module (TCM) (3.5L only), brake system status and all 4 wheel speeds from the ABS module. Communication between the 4X4 control module and other modules is obtained through the High Speed Controller Area Network (HS-CAN). If the 4X4 control module loses communication with, or receives invalid data from any of the necessary modules, DTCs are set and the 4X4 control module may not allow Four-Wheel Drive (4WD) operation.
- DTC U0415 Invalid Data Received from Anti-lock Brake System (ABS) Control Module - When the 4X4 control module receives invalid HS-CAN bus data or invalid wheel speed(s) from the ABS module for more than 5 seconds, this DTC is set.
This pinpoint test is intended to diagnose the following:
- ABS module
PINPOINT TEST C: DTC U0415
WARNING: When directed to drive the vehicle as part of this test, drive the vehicle on a hard surface in an area without traffic to prevent a crash. Failure to follow these instructions may result in personal injury.
NOTE: Carry out a thorough inspection and verification as outlined before carrying out this pinpoint test. Inspection and Verification
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C1 CHECK FOR ABS MODULE DTCs
- Ignition ON.
- Carry out the ABS module self-test.
- Review the results of the ABS module self-test.
- Are any DTCs present?
Yes
REFER to Antilock Brakes / Traction Control Systems for further diagnosis of the ABS.
No
GO to C2.
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C2 CHECK WHEEL SPEED SENSORS PIDs
- Enter the following diagnostic mode on the scan tool: DataLogger - 4X4 Control Module .
- While driving the vehicle at 48 km/h (30 mph), monitor the following wheel speed sensor PIDs:
- Left Front Wheel Speed Sensor (LF_WSPD)
- Left Rear Wheel Speed Sensor (LR_WSPD)
- Right Front Wheel Speed Sensor (RF_WSPD)
- Right Rear Wheel Speed Sensor (RR_WSPD)
- Do the 4 wheel speed sensors match the speedometer and are they within 2 km/h (1.2 mph) of each other?
Yes
The system is operating correctly at this time. CLEAR the DTCs. REPEAT the self-test.
No
INSPECT for proper tire size and tire inflation. If no concerns with the tires are found, REFER to Antilock Brakes / Traction Control Systems for further diagnosis of the ABS.
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