A/T
DTC P1132 - FRONT OXYGEN (A/F) SENSOR HEATER CIRCUIT LOW INPUTDTC 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.
Wiring Diagram:
WIRING DIAGRAM
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 11BY2.
NO: Go to step 11BY5.
11BY2: 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 - [(B18) 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 11BY3.
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
11BY3: 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 Ohms?
YES: Go to step 11BY4.
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).
11BY4: 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 Ohms?
YES: Go to step 11BY5.
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).
11BY5: CHECK CURRENT DATA.
1. Start 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 0.2 A?
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 11BY6.
11BY6: 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 11BY8.
NO: Go to step 11BY7.
11BY7: 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 11BY8.
11BY8: 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 11BY10.
NO: Go to step 11BY9.
11BY9: 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 11BY10.
11BY10: 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 Ohms?
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.