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

WARNING: This page is about a different variant/trim than selected.

DTC detecting condition:

Immediately at fault recognition

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Clear Memory Mode . and Inspection Mode Ref. to ENGINE (DIAGNOSTICS) (H4DO)>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

G11272679

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 chassis ground.
Connector & terminal

(B135) No. 5 (+) - Chassis 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 ECM connector and chassis ground.
Connector & terminal

(B135) No. 61 - Chassis ground:

(B135) No. 62 - Chassis ground:

(B135) No. 63 - Chassis ground:

(B135) No. 64 - Chassis ground:

(B135) No. 65 - Chassis 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