P1133

DTC P1133 - FRONT OXYGEN (A/F) SENSOR HEATER CIRCUIT HIGH INPUT

DTC DETECTING CONDITION:
- Two consecutive driving cycles with fault

CAUTION: After repair or replacement of faulty parts, conduct CLEAR MEMORY MODE, Refer to Normal Scan Data values and INSPECTION MODE, Refer to Normal Scan Data values. Clear Memory Mode

WIRING DIAGRAM

10BZ1: CHECK OUTPUT SIGNAL FROM ECM.
1. Turn ignition switch to ON.

Connector & Terminal (B134) No.23 (+) - Chassis Ground (-):

2. Measure voltage between ECM connector and chassis ground.

CHECK: Is the voltage more than 8 V?

YES: Go to step 10BZ3.

NO: Go to step 10BZ2.

10BZ2: CHECK OUTPUT SIGNAL FROM ECM.

Connector & Terminal (B134) No.22 (+) - Chassis Ground (-):

Measure voltage between ECM connector and chassis ground.

CHECK: Is the voltage more than 8 V?

YES: Go to step 10BZ3.

NO: Go to step 10BZ4.

10BZ3: CHECK FRONT OXYGEN (A/F) SENSOR HEATER CURRENT.
1. Turn ignition switch to OFF.
2. Repair battery short circuit in harness between ECM and front oxygen (A/F) sensor connector.
3. Turn ignition switch to ON.
4. Read data of front oxygen (A/F) sensor heater current using Subaru Select Monitor or the OBD-II general scan tool.

NOTE:
- Subaru Select Monitor
For detailed operation procedure, Refer to the "READ CURRENT DATA SHOWN ON DISPLAY FOR ENGINE". Refer to Normal Scan Data values.
- OBD-II general scan tool
For detailed operation procedure, Refer to the OBD-II General Scan Tool Instruction Manual.

CHECK: Is the value more than 2.3 A?

YES: Replace ECM.

NO: END

10BZ4: CHECK OUTPUT SIGNAL FROM ECM.

Connector & Terminal (B134) No.23 (+) - Chassis Ground (-):

Measure voltage between ECM connector and chassis ground.

CHECK: Does the voltage change more than 8V by shaking harness and connector of ECM while monitoring the value with voltage meter?

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

NO: Go to step 10BZ5.

10BZ5: CHECK OUTPUT SIGNAL FROM ECM.