Nissan March K13. Manual - part 258

HO2S1 HEATER

EC-493

< DTC/CIRCUIT DIAGNOSIS >

[HR12DE (TYPE 2)]

C

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E

F

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EC

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• Harness connectors E6, F1
• IPDM connectors E14
• 10 A fuse (No. 61)
• Harness for open or short between HO2S1 and fuse

>> Repair or replace harness or connectors.

4.

CHECK HO2S1 HEATER OUTPUT SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between HO2S1 harness connector and ECM harness connector.

4.

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair open circuit or short to ground or short to power in harness or connectors.

5.

CHECK HO2S1 HEATER

Refer to 

EC-493, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 6.

6.

REPLACE HEATED OXYGEN SENSOR 1

Replace heated oxygen sensor 1.

CAUTION:

• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7

in) onto a hard surface such as a concrete floor; use a new one.

• Before installing new heated oxygen sensor, clean exhaust system threads using Oxygen Sensor

Thread Cleaner (commercial service tool) and approved Anti-seize Lubricant (commercial service
tool).

>> INSPECTION END

7.

CHECK INTERMITTENT INCIDENT

Perform 

XX-XX, "*****"

.

>> INSPECTION END

Component Inspection

INFOID:0000000005886638

1.

CHECK HEATED OXYGEN SENSOR 1

1.

Turn ignition switch OFF.

2.

Disconnect heated oxygen sensor 1 harness connector.

3.

Check resistance between HO2S1 terminals as follows.

Is the inspection result normal?

HO2S1

ECM

Continuity

Connector

Terminal

Connector

Terminal

F46

3

F7

3

Existed

Terminals

Resistance [at 25

°

C (77

°

F)]

2 and 3

3.4 - 4.4 

Ω

 

1 and 2, 3, 4

∞

 

Ω

(Continuity should not exist)

4 and 1, 2, 3

EC-494

< DTC/CIRCUIT DIAGNOSIS >

[HR12DE (TYPE 2)]

HO2S1 HEATER

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

REPLACE HEATED OXYGEN SENSOR 1

Replace heated oxygen sensor 1.

CAUTION:

• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7

in) onto a hard surface such as a concrete floor; use a new one.

• Before installing new heated oxygen sensor, clean exhaust system threads using Oxygen Sensor

Thread Cleaner (commercial service tool) and approved Anti-seize Lubricant (commercial service
tool).

>> INSPECTION END

HO2S2

EC-495

< DTC/CIRCUIT DIAGNOSIS >

[HR12DE (TYPE 2)]

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HO2S2

Component Function Check

INFOID:0000000005886639

1.

PERFORM COMPONENT FUNCTION CHECK-I

1.

Start engine and warm it up to the normal operating temperature.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

4.

Let engine idle for 1 minute.

5.

Check the voltage between ECM harness connector and ground under the following condition.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

PERFORM COMPONENT FUNCTION CHECK-II

Check the voltage between ECM harness connector and ground under the following condition.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 3.

3.

PERFORM COMPONENT FUNCTION CHECK-III

Check the voltage between ECM harness connector and ground under the following condition.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-495, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005886640

1.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection E38. Refer to Ground Inspection in 

XX-XX, "*****"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

ECM

Condition

Voltage

Connector

Terminal

+

−

F8

50

(HO2S2 signal)

59

Revving up to 4,000 rpm under no load at 
least 10 times

The voltage does not remain in the range of 
0.2 - 0.4V.

ECM

Condition

Voltage

Connector

Terminal

+

−

F8

50

(HO2S2 signal)

59

Keeping engine speed at idle for 10 minutes

The voltage does not remain in the range of 
0.2 - 0.4V.

ECM

Condition

Voltage

Connector

Terminal

+

−

F8

50

(HO2S2 signal)

59

Coasting from 80 km/h (50 MPH) in 3rd gear po-
sition 

The voltage does not remain in the range of 
0.2 - 0.4V.

EC-496

< DTC/CIRCUIT DIAGNOSIS >

[HR12DE (TYPE 2)]

HO2S2

2.

CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect heated oxygen sensor 2 (HO2S2) harness connector.

3.

Disconnect ECM harness connector.

4.

Check the continuity between HO2S2 harness connector and ECM harness connector.

5.

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair open circuit or short to ground or short to power in harness or connectors.

3.

CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check the continuity between HO2S2 harness connector and ECM harness connector.

2.

Check the continuity between HO2S2 harness connector or ECM harness connector and ground.

3.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair open circuit or short to ground or short to power in harness or connectors.

4.

CHECK HEATED OXYGEN SENSOR 2

Refer to 

XX-XX, "*****"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

REPLACE HEATED OXYGEN SENSOR 2

Replace heated oxygen sensor 2.

CAUTION:

• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7

in) onto a hard surface such as a concrete floor; use a new one.

• Before installing new heated oxygen sensor, clean exhaust system threads using Oxygen Sensor

Thread Cleaner (commercial service tool) and approved Anti-seize Lubricant (commercial service
tool).

>> INSPECTION END

6.

CHECK INTERMITTENT INCIDENT

Refer to 

XX-XX, "*****"

.

>> INSPECTION END

HO2S2

ECM

Continuity

Connector

Terminal

Connector

Terminal

F45

1

F8

59

Existed

HO2S2

ECM

Continuity

Connector

Terminal

Connector

Terminal

F45

4

F8

50

Existed

HO2S2

ECM

Ground

Continuity

Connector

Terminal

Connector

Terminal

F45

4

F8

50

Ground

Not existed