P1132

DTC P1132 - FRONT OXYGEN (A/F) SENSOR HEATER CIRCUIT LOW INPUT

DTC DETECTING CONDITION:
- Two consecutive driving cycles with fault

CAUTION: After repair or replacement of faulty parts, conduct CLEAR MEMORY MODE and INSPECTION MODE. Refer to How to Clear Diagnostic Trouble Codes. Clear Memory Mode




WIRING DIAGRAM

10BY1: CHECK ANY OTHER DTC ON DISPLAY
CHECK: Does the Subaru Select Monitor or OBD-II general scan tool indicate DTC P1132 and P0141 at the same time?

YES: Go to step 10BY2.

NO: Go to step 10BY5.

10BY2: CHECK POWER SUPPLY TO FRONT OXYGEN (A/F) SENSOR.
1. Turn ignition switch to OFF.
2. Disconnect connector from front oxygen (A/F) sensor.
3. Turn ignition switch to ON.

Connector & Terminal (E24) No.2 (+) - Engine Ground (-):

4. Measure voltage between front oxygen (A/F) sensor connector and engine ground.

CHECK: Is the voltage more than 10 V?

YES: Go to step 10BY3.

NO: Repair power supply line.

NOTE:
In this case, repair the following:
- Open circuit in harness between main relay and front oxygen (A/F) sensor connector
- Poor contact in front oxygen (A/F) sensor connector
- Poor contact in main relay connector

10BY3: CHECK GROUND CIRCUIT OF ECM.

Connector & Terminal (B134) No.35 - Chassis Ground:

Measure resistance of harness between ECM connector and chassis ground.

CHECK: Is the resistance less than 5 ohm?

YES: Go to step 10BY4.

NO: Repair harness and connector.

NOTE:
In this case, repair the following:
- Open circuit in harness between ECM and engine ground terminal
- Poor contact in ECM connector Poor contact in coupling connector (B22)

10BY4: CHECK GROUND CIRCUIT OF ECM.

Connector & Terminal (B134) No.34 - Chassis Ground:

1. Measure resistance of harness between ECM connector and chassis ground.

CHECK: Is there resistance less than 5 ohm?

YES: Go to step 10BY5.

NO: Repair harness and connector.

NOTE:
In this case, repair the following:
- Open circuit in harness between ECM and engine ground terminal
- Poor contact in ECM connector Poor contact in coupling connector (B22)

10BY5: CHECK CURRENT DATA.
1. Start the engine.
2. Read data of front oxygen (A/F) sensor heater current using Subaru Select Monitor or 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 scan tool
For detailed operation procedures, Refer to the OBD-II General Scan Tool Instruction Manual.

CHECK: Is the value more than 0.2A?

YES: Repair poor contact in connector.

NOTE:
In this case, repair the following:
- Poor contact in front oxygen (A/F) sensor connector
- Poor contact in ECM connector

NO: Go to step 10BY6.

10BY6: CHECK OUTPUT SIGNAL FROM ECM.
1. Start and idle the engine.

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

2. Measure voltage between ECM connector and chassis ground.

CHECK: Is the voltage less than 1.0 V?

YES: Go to step 10BY8.

NO: Go to step 10BY7.

10BY7: CHECK OUTPUT SIGNAL FROM ECM.

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

Measure voltage between ECM connector and chassis ground.

CHECK: Does the voltage change less than 1.0 V by shaking harness and connector of ECM while monitoring the value with voltage meter?

YES: Repair poor contact in ECM connector.

NO: Go to step 10BY8.

10BY8: CHECK OUTPUT SIGNAL FROM ECM.

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

Measure voltage between ECM connector and chassis ground.

CHECK: Is the voltage less than 1.0 V?

YES: Go to step 10BY10.

NO: Go to step 10BY9.

10BY9: 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 less than 1.0 V by shaking harness and connector of ECM while monitoring the value with voltage meter?

YES: Repair poor contact in ECM connector.

NO: Go to step 10BY10.

10BY10 CHECK FRONT OXYGEN (A/F) SENSOR.
1. Turn ignition switch to OFF.

Terminals No.2 - No.5:

2. Measure resistance between front oxygen (A/F) sensor connector terminals.

CHECK: Is the resistance less than 10 ohm?

YES: Repair harness and connector.

NOTE:
In this case, repair the following:
- Open or ground short circuit in harness between front oxygen (A/F) sensor and ECM connector
- Poor contact in front oxygen (A/F) sensor connector
- Poor contact in ECM connector

NO: Replace front oxygen (A/F) sensor.