DTC P0032 Ho2S Heater Control Circuit High (Bank 1 Sensor 1)

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

DTC DETECTING CONDITION:

Detect as soon as the malfunction occurs.
GENERAL DESCRIPTION < Ref. to DTC P0032 HO2S HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 1) , Diagnostic Trouble Code (DTC) Detecting Criteria. >

CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode < Ref. to , OPERATION , Clear Memory Mode.> and Inspection Mode < Ref. to , PROCEDURE , Inspection Mode.>.

WIRING DIAGRAM:

Fig 1: Wiring Diagram - DTC P0032 HO2S Heater Control Circuit High (Bank 1 Sensor 1)

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE (DTC P0032)

Step	Check	Yes	No
1 CHECK GROUND CIRCUIT FOR ECM. Turn the ignition switch to OFF. Disconnect the connector from ECM. Measure the resistance between ECM connector and chassis ground. Connector & terminal (B134) No. 6 - Chassis ground: B136 No. 7- Chassis ground:	Is the resistance less than 5 ?	Go to step 2.	Repair the open circuit in harness between ECM connector and chassis ground.
2 CHECK VOLTAGE BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR. Measure the voltage between ECM connector and chassis ground. Connector & terminal (B137) No. 2 (+) - Chassis ground (-): (B137) No. 3 (+) - Chassis ground (-):	Is the voltage more than 10 V?	Repair the battery short circuit in harness between ECM and front oxygen (A/F) sensor connector.	Repair the poor contact in ECM connector.

Step

Check

Yes

1
CHECK GROUND CIRCUIT FOR ECM.

Turn the ignition switch to OFF.
Disconnect the connector from ECM.
Measure the resistance between ECM connector and chassis ground.
Connector & terminal

(B134) No. 6 - Chassis ground:

B136 No. 7- Chassis ground:

Is the resistance less than 5 ?

Go to step 2.

Repair the open circuit in harness between ECM connector and chassis ground.

2
CHECK VOLTAGE BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR.
Measure the voltage between ECM connector and chassis ground.

Connector & terminal

(B137) No. 2 (+) - Chassis ground (-):

(B137) No. 3 (+) - Chassis ground (-):

Is the voltage more than 10 V?

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

Repair the poor contact in ECM connector.