DTC P0606: Control Module Processor

Diagnosis start condition: 

At DCCD control module initialization (when power is turned to ON)

Malfunction judgment criteria: 

When CAN function of microcomputer is abnormal (when CAN register read/write is abnormal)

Trouble symptom: 

• Center differential does not operate.
• An oversteer tendency will become apparent.

Wiring diagram: 

Drivers control center differential control system Ref. to WIRING SYSTEM>Driver's Control Center Differential Control System .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK INPUT VOLTAGE OF DCCD CONTROL MODULE  .
   1. Turn the ignition switch to ON.
   2. Measure the voltage between DCCD control module and chassis ground.

      Connector & terminal 

      (B380) No. 11 (+) - Chassis ground (-):

   Is the voltage 10 - 13 V?

   Yes: Go to  2.

   No: Repair the open or short to ground in the power supply circuit.

2. CHECK INPUT VOLTAGE OF DCCD CONTROL MODULE  .
   1. Start the engine.
   2. Measure the voltage between DCCD control module and chassis ground.

      Connector & terminal 

      (B380) No. 11 (+) - Chassis ground (-):

   Is the voltage 13 - 15 V?

   Yes: Go to  3.

   No: Repair the open or short to ground in the power supply circuit.

3. CHECK DCCD CONTROL MODULE GROUND HARNESS  .
   1. Turn the ignition switch to ON.
   2. Measure the voltage between DCCD control module and chassis ground.

      Connector & terminal 

      (B380) No. 28 (+) - Chassis ground (-):

      (B380) No. 29 (+) - Chassis ground (-):

      (B380) No. 30 (+) - Chassis ground (-):

      (B380) No. 31 (+) - Chassis ground (-):

   Is the voltage less than 1 V?

   Yes: Check for poor contact of connector, if a fault is not found, replace the DCCD control module. Ref. to MANUAL TRANSMISSION AND DIFFERENTIAL(6MT) (TY85)>Driver's Control Center Differential Control Module .

   No: Repair the harness and connector.