KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P1572 IMM CIRCUIT FAILURE (EXCEPT ANTENNA CIRCUIT)

DTC DETECTING CONDITION:

Communication error between ID code box and ECM

TROUBLE SYMPTOM:

Engine will not start.

WIRING DIAGRAM:

• Gasoline engine model

• Diesel engine model

STEPCHECKYESNO

1.CHECK CURRENT DATA.

1) Check the collation CM data using the Subaru Select Monitor.

2) Display the next data. “Immobilizer” “Engine start” “Unlock confirmation”

Data

Immobilizer = Unset:

Engine start = Engine start permission:

Unlock confirmation = Confirmed:

Is the data displayed as described above?

Perform diagnostics with phenomenon.

2.CHECK CURRENT DATA.

Use the Subaru Select Monitor to check the collation CM data when holding down the push button ignition switch while depressing on the brake pedal (AT model) or clutch pedal (MT model).

Data

EGI code reception status = Reception:

NOTE:

If the status changes to “Not yet received” in 10 seconds after displaying “Reception”, or when performing the check again, perform the check after turning the ignition to OFF.

Is the data displayed as described above?

Repair or replace the harness between ID code box and ECM.

3.CHECK WIRING HARNESS.

1) Turn the ignition switch to OFF.

2) Disconnect the ID code box connector and the ECM connector.

3) Using a tester, measure the resistance between ID code box connector and ECM.

Connector & terminal

Gasoline engine model (Euro 4)

(B422) No. 5 — (B135) No. 31:
(B422) No. 6 — (B135) No. 23:

Gasoline engine model (Euro 5)

(B422) No. 5 — (B135) No. 12:
(B422) No. 6 — (B135) No. 11:

Diesel engine model

(B422) No. 5 — (B134) No. 50:
(B422) No. 6 — (B134) No. 50:

Is the resistance less than 10 Ω?

Repair or replace the harness line between ID code box and ECM.

4.CHECK WIRING HARNESS.

Using a tester, measure the resistance between ID code box connector and chassis ground.

Connector & terminal

(B422) No. 8 — Chassis ground:

Is the resistance less than 10 Ω?

Repair or replace the open circuit of harness.

5.CHECK ECM.

Install the ECM from other normal operating vehicle (with push button start) which use same ECM to the vehicle to be diagnosed.

Is ECM registration finished? And does the engine start?

Replace the ECM. Install the ECM from other vehicle to the original vehicle.

Replace the ID code box.