Subaru Crosstrek Service Manual: Dtc p0137 o2 sensor circuit low voltage bank 1 sensor 2

Subaru Crosstrek Service Manual / Engine (diagnostics)(h4do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p0137 o2 sensor circuit low voltage bank 1 sensor 2

ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P0137 O2 SENSOR CIRCUIT LOW VOLTAGE BANK 1 SENSOR 2

DTC detecting condition:

Detected when two consecutive driving cycles with fault occur.

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION">, and Inspection Mode Inspection Mode > PROCEDURE">.

Wiring diagram:

Engine electrical system Engine Electrical System">

STEP	CHECK	YES	NO

1.CHECK REAR OXYGEN SENSOR DATA.

1) Warm up the engine until engine coolant temperature is higher than 75°C (167°F), and keep the engine speed at 3,000 rpm. (2 minutes maximum)

2) Read the value of «Rear O2 Sensor Voltage» using the Subaru Select Monitor or a general scan tool.

NOTE:

• Subaru Select Monitor

For detailed operation procedures, refer to “Current Data Display For Engine”. Subaru Select Monitor">

• General scan tool

For detailed operation procedures, refer to the general scan tool operation manual.

Is the value of «Rear O2 Sensor Voltage» 0.490 V or more?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0137 O2 SENSOR CIRCUIT LOW VOLTAGE BANK 1 SENSOR 2">Go to Step 5.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0137 O2 SENSOR CIRCUIT LOW VOLTAGE BANK 1 SENSOR 2">Go to Step 2.

2.CHECK REAR OXYGEN SENSOR CONNECTOR AND COUPLING CONNECTOR.

Has water entered the connector?

Completely remove any water inside.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0137 O2 SENSOR CIRCUIT LOW VOLTAGE BANK 1 SENSOR 2">Go to Step 3.

3.CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR CONNECTOR.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from ECM.

3) Disconnect the connector from rear oxygen sensor.

4) Measure the resistance of harness between ECM connector and rear oxygen sensor connector.

Connector & terminal

(B136) No. 21 — (E25) No. 3:

(B135) No. 30 — (E25) No. 4:

Is the resistance less than 1 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0137 O2 SENSOR CIRCUIT LOW VOLTAGE BANK 1 SENSOR 2">Go to Step 4.

Repair the harness and connector.

NOTE:

In this case, repair the following item:

• Open circuit in harness between ECM connector and rear oxygen sensor connector

• Poor contact of coupling connector

4.CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR CONNECTOR.

1) Connect the connector to ECM.

2) Turn the ignition switch to ON.

3) Measure the voltage between rear oxygen sensor connector and chassis ground.

Connector & terminal

(E25) No. 3 (+) — Chassis ground (−):

Is the voltage 0.2 — 0.5 V?

Replace the rear oxygen sensor. Rear Oxygen Sensor">

Repair the harness and connector.

NOTE:

In this case, repair the following item:

• Open circuit in harness between ECM connector and rear oxygen sensor connector

• Poor contact of coupling connector

• Poor contact of ECM connector

5.CHECK EXHAUST SYSTEM.

Check exhaust system parts.

NOTE:

Check the following items.

• Looseness and improper fitting of exhaust system parts

• Damage (crack, hole etc.) of parts

• Loose part and improper installation between front oxygen (A/F) sensor and rear oxygen sensor

Is there any fault in exhaust system?

Repair or replace faulty parts.

Replace the rear oxygen sensor. Rear Oxygen Sensor">

1. OUTLINE OF DIAGNOSIS

Detect continuity NG of the oxygen sensor. If the oxygen sensor voltage reading is not within the probable range considering the operating conditions, judge as NG.

2. COMPONENT DESCRIPTION

(A)	Electromotive force	(B)	Air fuel ratio	(C)	Lean
(D)	Rich	(E)	Theoretical air fuel ratio	(F)	Comparative voltage

(1)	Atmosphere	(2)	Exhaust gas	(3)	Electromotive force

3. EXECUTION CONDITION

Secondary parameters	Execution condition	DTC
Low (1)		P0137
Battery voltage	≥ 10.9 V
Main feedback	In operation
Amount of intake air	≥ 10 g/s (0.35 oz/s)
Low (2)		P0137
Battery voltage	≥ 10.9 V
Main feedback	In operation
Amount of intake air	< 10 g/s (0.35 oz/s)
High		P0138
Battery voltage	≥ 10.9 V

4. GENERAL DRIVING CYCLE

After starting the engine, continuously perform the diagnosis with the same engine condition.

5. DIAGNOSTIC METHOD

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment value

Malfunction Criteria	Threshold Value	DTC
Low		P0137
O2 SENSOR CIRCUIT LOW VOLTAGE BANK 1 SENSOR 2	< 0.03 V
High		P0138
O2 SENSOR CIRCUIT HIGH VOLTAGE BANK 1 SENSOR 2	≥ 1.2 V

Time needed for diagnosis:

Low (1): 20000 ms

Low (2): 40000 ms

High: 2500 ms

Malfunction indicator light illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

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