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

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

Engine electrical system, 3.6 L model (without push button start). See appropriate SYSTEM WIRING DIAGRAM article.
Engine electrical system, 3.6 L model (with push button start). See appropriate SYSTEM WIRING DIAGRAM article.

Fig 1: Front Oxygen Sensor - Wiring Diagram
Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR. Turn the ignition switch to OFF. Measure the voltage between ECM and chassis ground. Connector & terminal (B136) No. 5 (+) - Chassis ground (-): (B136) No. 6 (+) - Chassis ground (-):	Is the voltage 10 V or more?	Repair the short circuit to power in the harness between ECM and front oxygen (A/F) sensor connector.	Go to step 2 .
2 CHECK GROUND CIRCUIT FOR ECM. Disconnect the connector from ECM. Measure the resistance between ECM and chassis ground. Connector & terminal (B134) No. 3 - Chassis ground: (B134) No. 4 - Chassis ground: (B134) No. 6 - Chassis ground: (B137) No. 1 - Chassis ground: (B137) No. 3 - Chassis ground: (B137) No. 5 - Chassis ground:	Is the resistance less than 5 Ω?	Repair the poor contact of ECM connector.	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