DTC P1626: Auto Start Request Circuit High: 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
Auto Start Stop Ref. to WIRING SYSTEM>AUTO START STOP>WIRING DIAGRAM>ENGINE TYPE FB .

Courtesy of SUBARU OF AMERICA, INC.

ENGINE TYPE FA
Auto Start Stop Ref. to WIRING SYSTEM>AUTO START STOP>WIRING DIAGRAM>ENGINE TYPE FA .

Courtesy of SUBARU OF AMERICA, INC.

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 .

CHECK DATA MONITOR .
1. Turn the ignition switch to ON.
2. Read the data of [Restart Commanded Signal] in ECM using Subaru Select Monitor. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>DATA MONITOR . Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>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 and terminal
  
  ENGINE TYPE FB
  
  (E53) No. 36 - (T21) No. 23:
  
  ENGINE TYPE FA
  
  (E51) No. 19 - (B67) 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 ECM using Subaru Select Monitor. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>DATA MONITOR . Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>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) . Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>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) . Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION CONTROL MODULE (TCM) .