DTC P173C: Electric Fluid Pump (CVT) Status Circuit Low: Notes

1. -

DTC detecting condition:

Detected when three consecutive driving cycles with fault occur.

Trouble symptom:

Auto Start Stop does not operate.

Wiring diagram:

ENGINE TYPE FB

CVT control system Refer to WIRING SYSTEM>CVT CONTROL SYSTEM>WIRING DIAGRAM>ENGINE TYPE FB .

Fuse and relay Refer to WIRING SYSTEM>FUSE AND RELAY>LOCATION>ENGINE COMPARTMENT SIDE (ENGINE TYPE FB) .

G13630226

Courtesy of SUBARU OF AMERICA, INC.

ENGINE TYPE FA

CVT control system Refer to WIRING SYSTEM>CVT CONTROL SYSTEM>WIRING DIAGRAM>ENGINE TYPE FA .

Fuse and relay Refer to WIRING SYSTEM>FUSE AND RELAY>LOCATION>ENGINE COMPARTMENT SIDE (ENGINE TYPE FA) .

G13630227

Courtesy of SUBARU OF AMERICA, INC.

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. Refer to AUTO START STOP (DIAGNOSTICS)>Basic Diagnostic Procedure .

CHECK HARNESS BETWEEN TCM AND ELECTRIC OIL PUMP CONNECTOR .
1. Turn the ignition switch to OFF.
2. Disconnect the TCM connector.
3. Disconnect the connector of electric oil pump.
4. Measure the resistance between TCM connector and chassis ground.
  Connector & terminal
  
  ENGINE TYPE FB
  
  (T21) No. 7 - Chassis ground:
  
  ENGINE TYPE FA
  
  (B67) No. 7 - Chassis ground:
Is the resistance 1 MΩ or more?

Yes : Go to 2.

No : Repair the short circuit to ground in the harness between TCM and electric oil pump connector.
CHECK ELECTRIC OIL PUMP DIAGNOSIS SIGNAL .
1. Connect the TCM connector.
2. Turn the ignition switch to ON.
3. Read the data of [Electric oil pump diagnosis duty cycle] using Subaru Select Monitor. Refer to AUTO START STOP (DIAGNOSTICS)>Data Monitor .
Is the value of [Electric oil pump diagnosis duty cycle] 0[%]?

Yes : Replace the electric oil pump. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>ELECTRIC FLUID PUMP . Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>ELECTRIC FLUID PUMP .

No : Check for poor contact of TCM connector. Replace the TCM if no fault is found. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>TRANSMISSION CONTROL MODULE (TCM) . Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION CONTROL MODULE (TCM) .