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 Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Clear Memory Mode . and Inspection Mode Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Inspection Mode .
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 .

Fig 1: A/F/O2 Heater Control Circuit High Bank 1 Sensor 1 - Wiring Diagram

G11270520

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 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 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 ECM 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 and engine ground
  - Poor contact of coupling connector