DTC P162A: Starter Interlock Internal Circuit: Notes

1. - 

DTC detecting condition: 

Immediately at fault recognition

Trouble symptom: 

• Improper idling
• Poor driving performance

Wiring diagram: 

Engine Electrical System Ref. to WIRING SYSTEM (IMPREZA MODEL)>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM .

• IMPREZA MODEL

Courtesy of SUBARU OF AMERICA, INC.

• CROSSTREK MODEL

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK INPUT VOLTAGE OF ECM  .
   1. Disconnect the connector from ECM.
   2. Turn the ignition switch to ON.
   3. Measure the voltage between ECM connector and chassis ground.

   Connector and terminal 

   (B134) No. 67 (+) - Chassis ground (-):

   (B134) No. 68 (+) - Chassis ground (-):

   Is the voltage 10 - 13 V?

   Yes:  Go to  2.

   No:  Repair the power supply line.

   NOTE: In this case, repair the following item:
   • Open circuit in harness between ECM connector and battery terminal
   • Blown out of fuse
   • Replace main relay
   • Replace M/B
2. CHECK ECM GROUND HARNESS  .
   1. Connect all connectors.
   2. Turn the ignition to ON.
   3. Measure the voltage between ECM connector and chassis ground.

   Connector and terminal 

   (B134) No. 69 (+) - Chassis ground (-):

   (B134) No. 70 (+) - Chassis ground (-):

   (B134) No. 71 (+) - Chassis ground (-):

   (B134) No. 72 (+) - Chassis ground (-):

   Is the voltage less than 1 V?

   Yes:  Go to  3.

   No:  Repair the harness and connector.

   NOTE: In this case, repair the following item:
   • Open circuit in ground circuit
   • Loose engine ground terminal
   • Poor contact of coupling connector
3. CHECK DTC  .
   1. Using the Subaru Select Monitor or a general scan tool, perform the clear memory of [Engine]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
   2. Perform inspection mode using the Subaru Select Monitor. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>INSPECTION MODE .

   Is DTC P162A displayed as a readiness code?

   Yes:  Check the connector for poor contact and check the harness. Replace the ECM if no fault is found. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE CONTROL MODULE (ECM) .

   No:  Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.