DTC P0032: A/F/O2 Heater Control Circuit High Bank 1 Sensor 1: Notes

DTC detecting condition:

Immediately at fault recognition

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>Clear Memory Mode>OPERATION , and inspection mode Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>Inspection Mode>PROCEDURE .

Use the check board when measuring the ECM terminal voltage and resistance.

Wiring diagram:

Engine Electrical System Ref. to WIRING SYSTEM>Engine Electrical System>WIRING DIAGRAM .

G11577046

Courtesy of SUBARU OF AMERICA, INC.

CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR .
1. Turn the ignition switch to OFF.
2. Measure the voltage between ECM connector and engine ground.
  Connector & terminal
  
  (E159) No. 9 (+) - Engine ground (-):
Is the voltage 10 V or more?

Yes: Repair the short circuit to power in the harness between ECM connector and front oxygen (A/F) sensor connector.

No: Go to 2
CHECK GROUND CIRCUIT FOR ECM .
1. Disconnect the connector from ECM.
2. Measure the resistance between the ECM connector and engine ground.
  Connector & terminal
  
  (B134) No. 35 - Engine ground:
  
  (B134) No. 47 - Engine ground:
  
  (E159) No. 10 - Engine ground:
  
  (E159) No. 17 - Engine ground:
  
  (E159) No. 18 - Engine ground:
  
  (E159) No. 25 - Engine ground:
  
  (E159) No. 26 - Engine ground:
Is the resistance less than 5 Ω?

Yes: Repair the poor contact of ECM connector.

No: Repair the harness and connector.
NOTE:
In this case, repair the following item:
- Open circuit of harness between ECM connector and engine ground
- Poor contact of coupling connector