ENGINE (DIAGNOSTICS)(H4SO) > 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:

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 battery short circuit of 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.

NOTE:

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

Is the current 2.3 A or more?

Replace the ECM.

Finish the diagnosis.

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 ECM harness and connector?

Repair the battery short circuit of harness between ECM and front oxygen (A/F) sensor connector.

Finish the diagnosis.