DTC P0C2C: Electric/Auxiliary Transmission Fluid Pump Control Module Feedback Signal Range/Performance: Notes

DTC detecting condition:

Detected when two consecutive driving cycles with fault occur.

Trouble symptom:

Auto Start Stop does not operate.

CAUTION:

Use the check board when measuring the TCM terminal voltage and resistance .
After servicing or replacing faulty parts, perform the last step of the basic diagnostic procedure . Ref. to AUTO START STOP (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

Wiring diagram:

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

Courtesy of SUBARU OF AMERICA, INC.

CHECK REPEATABILITY .
1. Using the Subaru Select Monitor, perform the clear memory. Ref. to COMMON (DIAGNOSTICS)>CLEAR MEMORY .
2. Start the engine.
3. Operate Auto Start Stop after driving the vehicle, then restart the engine by pressing 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 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 .
CHECK ELECTRIC OIL PUMP OPERATION STATUS SIGNAL .
1. Turn the ignition switch to ON.
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: Go to 4.

No: Go to 3.
CHECK ELECTRIC OIL PUMP OPERATION COMMAND SIGNAL .
Read the waveform of electric oil pump operation command signal using an oscilloscope.

Connector & terminal

(T10) No. 21 (+) - Chassis ground (-):

Is the duty ratio of electric oil pump operation command signal 10%? 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. If no fault is found, replace the electric oil pump. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR580)>ELECTRIC FLUID PUMP .

No: 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) .
CHECK ELECTRIC OIL PUMP OPERATION STATUS SIGNAL .
1. Start the engine.
2. Perform the active test using Subaru Select Monitor to activate the Auto Start Stop. Ref. to AUTO START STOP (DIAGNOSTICS)>ACTIVE TEST .
3. 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 poor contact of TCM connector. Replace the TCM if no fault is found. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR580)>TRANSMISSION CONTROL MODULE (TCM) .

No: Go to 5.
CHECK ELECTRIC OIL PUMP OPERATION COMMAND SIGNAL .
1. Start the engine.
2. Perform the active test using Subaru Select Monitor to activate the Auto Start Stop. Ref. to AUTO START STOP (DIAGNOSTICS)>ACTIVE TEST .
3. Read the waveform of electric oil pump operation command signal using an oscilloscope.
  Connector & terminal
  
  (T10) No. 21 (+) - Chassis ground (-):
Is the duty ratio of electric oil pump operation command signal as shown below? Ref. to AUTO START STOP (DIAGNOSTICS)>CONTROL MODULE I/O SIGNAL>WAVEFORM .

Except for WILDERNESS MODEL: 70%

WILDERNESS MODEL: 55%

Yes: 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 .

No: 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) .