DTC P1626: Auto Start Request Circuit High: 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/ECM 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:

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

Courtesy of SUBARU OF AMERICA, INC.

CHECK DATA MONITOR .
1. Turn the ignition switch to ON.
2. Read the data of [Restart Commanded Signal] in [Engine] using Subaru Select Monitor. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>DATA MONITOR .
  
  NOTE: Start the engine and drive at 5 km/h (3 MPH) or more .
Does the display of [Restart Commanded Signal] change to ON while driving?

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: Go to 2.
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 TCM connector.
  Connector & terminal
  
  (E158) No. 36 - (T10) No. 23:
Is the resistance less than 1 Ω?

Yes: Go to 3.

No: Repair the open circuit of harness and poor contact of coupling connector between ECM connector and TCM connector.
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 .
4. Short the terminal No. 23 of TCM connector to ground.
Does the display of [Restart Commanded Signal] change to ON?

Yes: 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) .

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) .