Nissan X-Trail 32. Manual - part 758

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-161

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

• Malfunctioning seal of intake air system, etc.

>> GO TO 30.

29.

CHECK “A/F ALPHA-B1” AND “B/FUEL SCHDL”

Select “A/F ALPHA-B1” and “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and make sure that the
indication is within the SP value. 

Is the measurement value within the SP value?

YES

>> INSPECTION END

NO

>> Detect malfunctioning part according to 

EC-420, "Symptom Table"

.

30.

CHECK “B/FUEL SCHDL”

Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and then make sure that the indication is
within the SP value.

Is the measurement value within the SP value?

YES

>> INSPECTION END

NO

>> Detect malfunctioning part according to 

EC-420, "Symptom Table"

.

EC-162

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

POWER SUPPLY AND GROUND CIRCUIT

POWER SUPPLY AND GROUND CIRCUIT

Diagnosis Procedure

INFOID:0000000010775093

1.

CHECK FUSE

1.

Turn ignition switch OFF.

2.

Check that the following fuse is not fusing.

Is the fuse fusing?

YES

>> Replace the fuse. (Check the power supply if it fuses again.)

NO

>> GO TO 2.

2.

CHECK GROUND CONNECTION

Check ground connection E21 and E38. Refer to 

GI-46, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace ground connection.

3.

CHECK ECM GROUND CIRCUIT

1.

Disconnect ECM harness connector.

2.

Check the continuity between ECM harness connector and ground.

3.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace malfunctioning part.

4.

CHECK ECM POWER SUPPLY-1

1.

Reconnect ECM harness connector.

2.

Turn ignition switch ON.

3.

Check the voltage between ECM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

Location

Fuse No.

Capacity

IPDM E/R

#82

15 A

#95

5 A

+

Ground

Continuity

ECM

Connector

Terminal

F7

11

Ground

Existed

F8

54

55

56

E16

123

125

128

ECM

Voltage

(Approx.)

Connector 

+

−

Terminal

E16

121

128

Battery voltage

POWER SUPPLY AND GROUND CIRCUIT

EC-163

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

NO

>> GO TO 6.

5.

CHECK ECM POWER SUPPLY-2

Check the voltage between ECM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> GO TO 7.

6.

CHECK ECM POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Disconnect IPDM E/R harness connector.

4.

Check the continuity between ECM harness connector and IPDM E/R harness connector.

5.

Also check harness for short to power.

Is the inspection result normal?

YES

>> Perform trouble diagnosis for power supply.

NO

>> Repair or replace malfunctioning part.

7.

CHECK ECM RELAY CONTROL SIGNAL

Check the voltage between ECM harness connector terminals as per the following.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-44, "Intermittent Incident"

.

NO

>> GO TO 8.

8.

CHECK ECM RELAY CONTROL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Disconnect IPDM E/R harness connector.

4.

Check the continuity between ECM harness connector and IPDM E/R harness connector.

ECM

Condition

Voltage

(Approx.)

Connector 

+

−

Terminal

E16

121

128

Ignition switch ON 

→

 OFF

After turning ignition switch OFF, battery 
voltage will exist for a few seconds and drop 
to approximately 0 V.

+

−

Continuity

ECM

IPDM E/R

Connector Terminal

Connector Terminal

E16

121

F72

73

Existed

ECM

Condition

Voltage

(Approx.)

Connector

+

−

Terminal

E16

121

128

Ignition switch ON

0 V

Turn ignition switch OFF and 
wait at least 10 seconds.

Battery voltage

+

−

Continuity

ECM

IPDM E/R

Connector Terminal

Connector Terminal

E16

121

F72

73

Existed

EC-164

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

POWER SUPPLY AND GROUND CIRCUIT

5.

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

Is the inspection result normal?

YES

>> Replace IPDM E/R. Refer to 

PCS-60, "Removal and Installation"

.

NO

>> Repair or replace malfunctioning part.

9.

CHECK IGNITION SWITCH SIGNAL

1.

Turn ignition switch ON.

2.

Check the voltage between ECM harness connector terminals.

Is the inspection result normal?

YES

>> Refer to 

GI-44, "Intermittent Incident"

.

NO

>> GO TO 10.

10.

CHECK IGNITION SWITCH SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Disconnect IPDM E/R harness connector.

4.

Check the continuity between ECM harness connector and IPDM E/R harness connector.

5.

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

Is the inspection result normal?

YES

>> Perform trouble diagnosis for power supply.

NO

>> Repair or replace malfunctioning part.

ECM

Condition

Voltage

(Approx.)

Connector

+

−

Terminal

E16

109

128

Ignition switch OFF

0 V

Ignition switch ON

Battery voltage

+

−

Continuity

ECM

IPDM E/R

Connector

Terminal

Connector

Terminal

E16

109

E12

25

Existed