DTC P0B0D: Auxiliary Transmission Fluid Pump Motor Control Module: Notes

DTC detecting condition: 

Detected when two consecutive driving cycles with fault occur.

Trouble symptom: 

Auto Start Stop does not operate.

Wiring diagram: 

CVT control system Ref. to WIRING SYSTEM>CVT CONTROL SYSTEM .

Fuse and relay Ref. to WIRING SYSTEM>FUSE AND RELAY>LOCATION .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK REPEATABILITY  .
   1. Using the Subaru Select Monitor, perform the clear memory of [Transmission]. Ref. to COMMON (DIAGNOSTICS)>CLEAR MEMORY .
   2. Start the engine.
   3. Operate Auto Start Stop after driving the vehicle, then restart the engine by operating the Auto Start Stop cancel switch.
      NOTE: Even if Auto Start Stop does not operate, go to step 4)  .
   4. Turn the ignition switch to OFF and wait for 10 seconds.
   5. Using the Subaru Select Monitor, read the DTC of [Transmission] after repeating the procedure from step  2 to  4 three times. Ref. to AUTO START STOP (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is the same DTC as current diagnosis output?

   Yes:  Go to  2.

   No:  The circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

   NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause  .
2. CHECK STATUS AT DTC MEMORY  .

   Is the DTC memory set after Auto Start Stop is activated?

   Yes:  Go to  5.

   No:  Go to  3.

3. CHECK HARNESS BETWEEN ELECTRIC OIL PUMP CONNECTOR AND CHASSIS GROUND  .
   1. Turn the ignition switch to OFF.
   2. Measure the resistance of harness between electric oil pump connector and chassis ground.

      Connector & terminal 

      (T27) No. 1 - Chassis ground:

   Is the resistance less than 5 Ω?

   Yes:  Go to  4.

   No:  Repair the open circuit in harness between electric oil pump connector and chassis ground.

4. CHECK ELECTRIC OIL PUMP OPERATION STATUS SIGNAL  .
   1. Start the engine.
   2. Read the waveform of electric oil pump operation status signal using an oscilloscope.

      Connector & terminal 

      (T10) No. 7 (+) - Chassis ground (-):

   Is the duty ratio of electric oil pump operation status signal 30%? Ref. to AUTO START STOP (DIAGNOSTICS)>CONTROL MODULE I/O SIGNAL>WAVEFORM .

   Yes:  Check for the poor contact in TCM connector and electric oil pump connector. Replace the TCM if no fault is found. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR580)>TRANSMISSION CONTROL MODULE (TCM) .

   No:  Check for the poor contact in TCM connector and electric oil pump connector. If no fault is found, replace the electric oil pump. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR580)>ELECTRIC FLUID PUMP .

5. CHECK ELECTRIC OIL PUMP OPERATION STATUS SIGNAL  .
   1. Using the Subaru Select Monitor, perform the clear memory of [Transmission]. Ref. to COMMON (DIAGNOSTICS)>CLEAR MEMORY .
   2. Start the engine.
   3. Perform the active test using Subaru Select Monitor to activate the Auto Start Stop. Ref. to AUTO START STOP (DIAGNOSTICS)>ACTIVE TEST .
   4. Read the waveform of electric oil pump operation status signal using an oscilloscope.

      Connector & terminal 

      (T10) No. 7 (+) - Chassis ground (-):

   Is the duty ratio of electric oil pump operation status signal 50%? Ref. to AUTO START STOP (DIAGNOSTICS)>CONTROL MODULE I/O SIGNAL>WAVEFORM .

   Yes:  Check for the poor contact in TCM connector and electric oil pump connector. Replace the TCM if no fault is found. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR580)>TRANSMISSION CONTROL MODULE (TCM) .

   No:  Check for the poor contact in TCM connector and electric oil pump connector. If no fault is found, replace the electric oil pump. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR580)>ELECTRIC FLUID PUMP .