DTC P1625: Auto Start Request Circuit Low: Notes

DTC detecting condition: 

Detected when two consecutive driving cycles with fault occur.

Trouble symptom: 

Auto Start Stop does not operate.

Wiring diagram: 

Auto Start Stop Ref. to WIRING SYSTEM>AUTO START STOP .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK HARNESS BETWEEN ECM CONNECTOR AND TCM CONNECTOR  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the ECM connector.
   3. Disconnect the TCM connector.
   4. Measure the resistance between ECM connector and chassis ground.

      Connector & terminal 

      (E158) No. 36 - Chassis ground:

   Is the resistance 1 MΩ or more?

   Yes:  Go to  2.

   No:  Repair the short circuit to ground in harness between ECM connector and TCM connector.

2. CHECK DATA MONITOR  .
   1. Connect the ECM connector.
   2. Turn the ignition switch to ON.
   3. Read the data of [Restart Commanded Signal] in [Engine] using Subaru Select Monitor. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>DATA MONITOR .

   Is "OFF" displayed in [Restart Commanded Signal]?

   Yes:  Go to  3.

   No:  Check for poor contact of ECM connector. Replace the ECM if no fault is found. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>ENGINE CONTROL MODULE (ECM) .

3. CHECK DATA MONITOR  .
   1. Connect the TCM connector.
   2. Turn the ignition switch to ON.
   3. Read the data of [Restart Commanded Signal] in [Engine] using Subaru Select Monitor. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>DATA MONITOR .

   Is "OFF" displayed in [Restart Commanded Signal]?

   Yes:  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  .

   No:  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) .