ENGINE (DIAGNOSTICS)(H4DOTC) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P0032 HO2S HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 1)

DTC DETECTING CONDITION:

Immediately at fault recognition

CAUTION:

After repairing or replacing the defective part, perform the Clear Memory Mode and Inspection Mode .

WIRING DIAGRAM:

• LHD model

• RHD model

STEPCHECKYESNO

1.CHECK OUTPUT SIGNAL OF ECM.

1) Turn the ignition switch to ON.

2) Measure the voltage between ECM connector and chassis ground.

Connector & terminal

(B136) No. 2 (+) — Chassis ground (−):

(B136) No. 3 (+) — Chassis ground (−):

Is the voltage 8 V or more?

2.CHECK FRONT OXYGEN (A/F) SENSOR HEATER CURRENT.

1) Turn the ignition switch to OFF.

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

3) Turn the ignition switch to ON.

4) Read the data of front oxygen (A/F) sensor heater current using Subaru Select Monitor or general scan tool.

NOTE:

• Subaru Select Monitor

For detailed operation procedure, refer to “READ CURRENT DATA FOR ENGINE”.

• General scan tool

For detailed operation procedure, refer to the general scan tool operation manual.

Is the current 2.3 A or more?

Replace the ECM.

END.

3.CHECK OUTPUT SIGNAL OF ECM.

Measure the voltage between ECM connector and chassis ground.

Connector & terminal

(B136) No. 2 (+) — Chassis ground (−):

(B136) No. 3 (+) — Chassis ground (−):

Does the voltage change by shaking the harness and connector of ECM while monitoring the value on voltage meter?

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

END.