DTC P0038 - Ho2S Heater Control Circuit High (Bank 1 Sensor 2) -

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

DTC DETECTING CONDITION:
- Two consecutive driving cycles with malfunction
CAUTION: After repair or replacement of malfunctioning parts, conduct Clear Memory Mode < Ref. to OPERATION , CLEAR MEMORY MODE > and INSPECTION MODE < Ref. to OPERATION , INSPECTION MODE. >
WIRING DIAGRAM:

Fig 1: HO2S Heater Control Wiring Diagram
Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK INPUT SIGNAL FOR ECM. Measure voltage between ECM connector and chassis ground. Connector & terminal (B136) No. 4 (+) - Chassis ground (-):	Is the measured value more than 8 V?	Go to step 2.	Go to step 3.
2 CHECK CURRENT DATA. Turn ignition switch to OFF. Repair battery short circuit in harness between ECM and rear oxygen sensor connector. Turn ignition switch to ON. Read data of rear oxygen sensor heater current using Subaru Select Monitor or the general scan tool. NOTE: Subaru Select Monitor For detailed operation procedure, refer to the "READ CURRENT DATA FOR ENGINE". < Ref. to SUBARU SELECT MONITOR . > General scan tool For detailed operation procedure, refer to the General Scan Tool Instruction Manual.	Is the measured value more than 7 Ω?	Replace ECM. < Ref. to ENGINE CONTROL MODULE . >	END
3 CHECK POOR CONTACT. Check poor contact in ECM connector.	Is there poor contact in ECM connector?	Repair poor contact in ECM connector.	END