Nissan X-Trail 32. Manual - part 914

IGNITION SIGNAL

EC-785

< DTC/CIRCUIT DIAGNOSIS >

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IGNITION SIGNAL

Component Function Check

INFOID:0000000010986494

1.

INSPECTION START

Turn ignition switch OFF, and restart engine.
Does the engine start?

YES-1 >> With CONSULT: GO TO 2.
YES-2 >> Without CONSULT: GO TO 3.
NO

>> Proceed to 

EC-785, "Diagnosis Procedure"

.

2.

CHECK IGNITION SIGNAL FUNCTION

With CONSULT

1.

Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT.

2.

Check that each circuit produces a momentary engine speed drop.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to 

EC-785, "Diagnosis Procedure"

.

3.

CHECK IGNITION SIGNAL FUNCTION

 Without CONSULT

1.

Let engine idle.

2.

Read the voltage signal between ECM harness connector terminals with an oscilloscope.

NOTE:
The pulse cycle changes depending on rpm at idle.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to 

EC-785, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000010986495

1.

CHECK ECM POWER SUPPLY

1.

Turn ignition switch OFF, wait at least 10 seconds and then turn it ON.

2.

Check the voltage between ECM harness connector terminals.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Refer to 

EC-573, "Diagnosis Procedure"

.

ECM

Voltage signal

+

–

Connector

Terminal

Connector

Terminal

F68

86

E16

128

87

90

91

JMBIA0035GB

ECM

Voltage

Connector

+

–

Terminal

E60

121

128

Battery voltage

EC-786

< DTC/CIRCUIT DIAGNOSIS >

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IGNITION SIGNAL

2.

CHECK CONDENSER POWER SUPPLY

1.

Turn ignition switch OFF.

2.

Disconnect condenser harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between condenser harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

CHECK CONDENSER POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect IPDM E/R harness connector.

3.

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

4.

Also check harness for short to ground and to power.

Is the inspection result normal?

YES

>> Refer to 

EC-573, "Diagnosis Procedure"

.

NO

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

4.

CHECK CONDENSER GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Check the continuity between condenser harness connector and ground.

3.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 5.

NO

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

5.

CHECK CONDENSER

Check condenser. Refer to 

EC-789, "Component Inspection (Condenser)"

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace condenser.

6.

CHECK IGNITION COIL POWER SUPPLY

1.

Reconnect all harness connectors disconnected.

2.

Disconnect ignition coil harness connector.

3.

Turn ignition switch ON.

+

-

Voltage

Condenser

Connector

Terminal

F213

1

Ground

Battery voltage

+

-

Continuity

IPDM E/R

Condenser

Connector

Terminal

Connector

Terminal

F72

66

F213

1

Existed

E11

21

+

-

Voltage

Condenser

Connector

Terminal

F213

2

Ground

Existed

IGNITION SIGNAL

EC-787

< DTC/CIRCUIT DIAGNOSIS >

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4.

Check the voltage between ignition coil harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace harness or connectors.

7.

CHECK IGNITION COIL GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Check the continuity between ignition coil harness connector and ground.

3.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 8.

NO

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

8.

CHECK IGNITION COIL OUTPUT SIGNAL CIRCUIT

1.

Disconnect ECM harness connector.

2.

Check the continuity between ignition coil harness connector and ECM harness connector.

3.

Also check harness for short to ground and to power.

Is the inspection result normal?

YES

>> GO TO 9.

NO

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

9.

CHECK IGNITION COIL WITH POWER TRANSISTOR

Check ignition coil with power transistor. Refer to 

EC-788, "Component Inspection (Ignition Coil with Power

Transistor)"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-44, "Intermittent Incident"

.

+

-

Voltage

Ignition coil

Cylinder

Connector

Terminal

1

F33

3

Ground

Battery voltage

2

F34

3

3

F35

3

4

F36

3

+

-

Continuity

Ignition coil

Cylinder

Connector

Terminal

1

F33

2

Ground

Existed

2

F34

2

3

F35

2

4

F36

2

+

-

Continuity

Ignition coil

ECM

Cylinder

Connector

Terminal

Connector

Terminal

1

F33

1

F68

86

Existed

2

F34

1

87

3

F35

1

90

4

F36

1

91

EC-788

< DTC/CIRCUIT DIAGNOSIS >

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IGNITION SIGNAL

NO

>> Replace malfunctioning ignition coil with power transistor. Refer to 

EM-190, "Removal and Instal-

lation"

.

Component Inspection (Ignition Coil with Power Transistor)

INFOID:0000000010986496

1.

CHECK IGNITION COIL WITH POWER TRANSISTOR-1

1.

Turn ignition switch OFF.

2.

Disconnect ignition coil harness connector.

3.

Check resistance between ignition coil terminals as per the following.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace malfunctioning ignition coil with power transistor. Refer to 

EM-190, "Removal and Instal-

lation"

.

2.

CHECK IGNITION COIL WITH POWER TRANSISTOR-2

CAUTION:

Perform the following procedure in a place with no combustible objects and good ventilation.
1.

Turn ignition switch OFF.

2.

Reconnect all harness connectors disconnected.

3.

Remove fuel pump fuse in IPDM E/R to release fuel pressure.
NOTE:
Do not use CONSULT to release fuel pressure, or fuel pressure applies again during the following proce-
dure.

4.

Start engine.

5.

After engine stalls, crank it 2 or 3 times to release all fuel pressure.

6.

Turn ignition switch OFF.

7.

Remove all ignition coil harness connectors to avoid the electrical discharge from the ignition coils.

8.

Remove ignition coil and spark plug of the cylinder to be checked.

9.

Crank engine for 5 seconds or more to remove combustion gas in the cylinder.

10. Connect spark plug and harness connector to ignition coil.
11. Fix ignition coil using a rope etc. with gap of 13 - 17 mm (0.52 -

0.66 in) between the edge of the spark plug and grounded metal
portion as shown in the figure.

12. Crank engine for approximately 3 seconds, and check whether

spark is generated between the spark plug and the grounded
metal portion.

CAUTION:

• During the operation, always stay 0.5 m (19.7 in) or more

away from the spark plug and the ignition coil. Be careful
not to get an electrical shock while checking, because the
electrical discharge voltage becomes 20 kV or more.

• It might cause to damage the ignition coil if the gap of more than 17 mm (0.66 in) is taken.
NOTE:
When the gap is less than 13 mm (0.52 in), the spark might be generated even if the coil is mal-
functioning.

Is the inspection result normal?

YES

>> INSPECTION END

Ignition coil

Resistance 

Ω

 [at 25

°

C (77

°

F)]

+

-

Terminal No. (Polarity)

1

2

Except 0 or 

∞

3

Except 0

2

3

Spark should be generated.

JMBIA0066GB