DTC P162A: Starter Interlock Internal Circuit: Notes

-
DTC detecting condition:

Immediately at fault recognition

Trouble symptom:
- Improper idling
- Poor driving performance
Wiring diagram:

Engine Electrical System Ref. to WIRING SYSTEM>ENGINE ELECTRICAL SYSTEM .

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Use the check board when measuring the ECM terminal voltage and resistance. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>GENERAL DESCRIPTION>PREPARATION TOOL>HOW TO USE CHECK BOARD .

NOTE: After the faulty parts are repaired or replaced, perform the final check in Basic Diagnostic Procedure. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

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 engine ground.
  Connector & terminal
  
  (B134) No. 67 (+) - Engine ground (-):
  
  (B134) No. 68 (+) - Engine ground (-):
  
  Is the voltage 10 - 13 V?
  
  Yes
  
  Go to 2 .
  
  No
  
  Repair the following item.
  - Open circuit in harness between ECM connector and battery terminal
  - Blown out of fuse
  - Replace main relay
  - Replace M/B
CHECK ECM GROUND HARNESS .
1. Connect all connectors.
2. Turn the ignition to ON.
3. Measure the voltage between ECM connector and engine ground.
  Connector & terminal
  
  (B134) No. 69 (+) - Engine ground (-):
  
  (B134) No. 70 (+) - Engine ground (-):
  
  (B134) No. 71 (+) - Engine ground (-):
  
  (B134) No. 72 (+) - Engine ground (-):
  
  Is the voltage less than 1 V?
  
  Yes
  
  Go to 3 .
  
  No
  
  Repair the following item.
  - Open circuit in ground circuit
  - Loose engine ground terminal
  - Poor contact of coupling connector
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)>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)>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.