Nissan X-Trail 32. Manual - part 799

P0850 REVERSE/NEUTRAL POSITION SWITCH

EC-325

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

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Checks whole function of the reverse / neutral position signal circuit by this procedure. During this check, 1st
trip DTC may not be confirmed.
1.

Turn ignition switch ON.

2.

Select “P/N POSI SW” in “DATA MONITOR” mode of “ENGINE” using CONSULT. Then check the “P/N
POSI SW” signal as per the following conditions.

Without CONSULT

1.

Turn ignition switch ON.

2.

Check the voltage between ECM harness connector and ground as per the following conditions.

Is the inspection result normal?

YES-1 >> To check malfunction symptom before repair: Refer to 

GI-44, "Intermittent Incident"

.

YES-2 >> Confirmation after repair: INSPECTION END
NO

>> Proceed to 

EC-325, "6M/T : Diagnosis Procedure"

.

6M/T : Diagnosis Procedure

INFOID:0000000010775223

1.

CHECK REVERSE / NEUTRAL POSITION SWITCH POWER SUPPLY

1.

Turn ignition switch OFF.

2.

Disconnect reverse / neutral position switch harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between reverse / neutral position switch harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Perform the trouble diagnosis for power supply circuit.

2.

CHECK REVERSE / NEUTRAL POSITION SWITCH SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between reverse / neutral position switch harness connector and ECM harness con-
nector.

4.

Also check harness for short to ground and to power.

Is the inspection result normal?

YES

>> GO TO 3.

Selector lever position

Known-good signal

R or N position

ON

Except above position

OFF

+

−

Condition

Voltage

(Approx.)

ECM

Connector

Terminal

F7

14

Ground

Selector lever

R or N

Battery voltage

Except above

0 V

+

−

Voltage

Reverse / neutral position switch

Connector

Terminal

F46

2

Ground

Battery voltage

+

−

Continuity

Reverse / neutral position switch

ECM

Connector

Terminal

Connector

Terminal

F46

3

F7

14

Existed

EC-326

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

P0850 REVERSE/NEUTRAL POSITION SWITCH

NO

>> Repair or replace error-detected parts.

3.

CHECK REVERSE / NEUTRAL POSITION SWITCH

Check the reverse / neutral position switch. Refer to 

TM-24, "Component Inspection"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace reverse / neutral position switch. Refer to 

TM-41, "Removal and Installation"

.

P1078 EVT CONTROL POSITION SENSOR

EC-327

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

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P1078 EVT CONTROL POSITION SENSOR

DTC Description

INFOID:0000000010775224

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Harness or connectors
- Exhaust valve timing control position sensor circuit is open or shorted.
- Sensor power supply 2 circuit is shorted.
• Exhaust valve timing control position sensor
• Accumulation of debris to the signal plate of the camshaft
• Sensor power supply 2 circuit

FAIL-SAFE

Not applicable

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and let it idle for 10 seconds.

2.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Proceed to 

EC-327, "Diagnosis Procedure"

.

NO-1

>> To check malfunction symptom before repair: Refer to 

GI-44, "Intermittent Incident"

.

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010775225

1.

CHECK EXHAUST VALVE TIMING (EVT) CONTROL POSITION SENSOR POWER SUPPLY CIRCUIT-1

1.

Turn ignition switch OFF.

2.

Disconnect exhaust valve timing (EVT) control position sensor harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between EVT control position sensor harness connector terminals.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 2.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P1078

EXH TIM SEN/CIRC-B1
(Exhaust timing sensor circuit bank 1)

An excessively high or low voltage from the sensor is sent to ECM.

EVT control position sensor

Voltage

(Approx.)

Connector

+

−

Terminal

F104

1

2

5 V

EC-328

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

P1078 EVT CONTROL POSITION SENSOR

2.

CHECK EXHAUST VALVE TIMING (EVT) CONTROL POSITION SENSOR POWER SUPPLY CIRCUIT-2

Check the voltage between EVT control position sensor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 3.

3.

CHECK EXHAUST VALVE TIMING (EVT) CONTROL POSITION SENSOR POWER SUPPLY CIRCUIT-3

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between EVT control position sensor harness connector and ECM harness connec-
tor.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace malfunctioning part.

4.

CHECK SENSOR POWER SUPPLY 2 CIRCUIT

Perform 

EC-405, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair or replace malfunctioning part.

5.

CHECK EVT CONTROL POSITION SENSOR GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between EVT control position sensor harness connector and ECM harness connec-
tor.

4.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace malfunctioning part.

6.

CHECK ECM GROUND CIRCUIT

Check the continuity between ECM harness connector and ground.

+

−

Voltage

(Approx.)

EVT control position sensor

Connector

Terminal

F104

1

Ground

5 V

+

−

Continuity

EVT control position sensor

ECM

Connector

Terminal

Connector

Terminal

F104

1

F7

24

Existed

+

−

Continuity

EVT control position sensor

ECM

Connector

Terminal

Connector

Terminal

F104

2

F7

42

Existed