Nissan Pathfinder. Manual - part 533

EC-438

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

IGNITION SIGNAL

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace harness or connectors.

7.

CHECK IGNITION COIL GROUND CIRCUIT FOR OPEN AND SHORT

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 FOR OPEN AND SHORT

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 short 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-440, "Component Inspection (Ignition Coil with Power

Transistor)"

.

Ignition coil

Ground

Voltage

Cylinder

Connector

Terminal

1

F47

3

Ground

Battery voltage

2

F8

3

3

F48

3

4

F9

3

5

F49

3

6

F10

3

Ignition coil

Ground

Continuity

Cylinder

Connector

Terminal

1

F47

2

Ground

Existed

2

F8

2

3

F48

2

4

F9

2

5

F49

2

6

F10

2

Ignition coil

ECM

Continuity

Cylinder

Connector

Terminal

Connector

Terminal

1

F47

1

F51

11

Existed

2

F8

1

10

3

F48

1

9

4

F9

1

15

5

F49

1

14

6

F10

1

13

IGNITION SIGNAL

EC-439

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

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Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-49, "Intermittent Incident"

.

NO

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

EM-42, "Removal and Installa-

tion (LH)"

, 

EM-42, "Removal and Installation (RH)"

.

Component Inspection (Ignition Coil with Power Transistor)

INFOID:0000000009178369

1.

CHECK IGNITION COIL WITH POWER TRANSISTOR-I

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-42, "Removal and Installa-

tion (LH)"

, 

EM-42, "Removal and Installation (RH)"

.

2.

CHECK IGNITION COIL WITH POWER TRANSISTOR-II

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

Terminal No. (Polarity)

Resistance 

Ω [at 25°C (77°F)]

1 and 2

Except 0 or 

∞

1 and 3

Except 0

2 and 3

Spark should be generated.

JMBIA0066GB

EC-440

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

IGNITION SIGNAL

NO

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

EM-42, "Removal and Installa-

tion (LH)"

, 

EM-42, "Removal and Installation (RH)"

.

Component Inspection (Condenser-1)

INFOID:0000000009178370

1.

CHECK CONDENSER-1

1. Turn ignition switch OFF.

2. Disconnect condenser-1 harness connector.

3. Check resistance between condenser-1 terminals as per the following.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace condenser-1.

Terminals

Resistance

1 and 2

Above 1 M

Ω [at 25C° (77C°)]

INFORMATION DISPLAY (ASCD)

EC-441

< DTC/CIRCUIT DIAGNOSIS >

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INFORMATION DISPLAY (ASCD)

Component Function Check

INFOID:0000000009178371

1.

CHECK INFORMATION DISPLAY

1. Start engine.

2. Press MAIN switch on ASCD steering switch.

3. Drive the vehicle at more than 40 km/h (25 MPH).

CAUTION:

Always drive vehicle at a safe speed.

4. Press SET/COAST switch.

5. Check that the reading of the speedometer shows the same value as the set speed indicated in the infor-

mation display while driving the vehicle on a flat road.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to 

EC-442, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009178372

1.

CHECK DTC

Check that DTC UXXXX, P0500 or P1574 is not displayed.
Is the inspection result normal?

YES

>> GO TO 2.

NO-1 >> Perform trouble diagnosis for DTC UXXXX.

NO-2 >> Perform trouble diagnosis for DTC P0500. Refer to 

EC-333, "FOR NORTH AMERICA : DTC

Logic"

.

NO-3 >> Perform trouble diagnosis for DTC P1574. Refer to 

EC-386, "DTC Logic"

.

2.

CHECK DTC WITH COMBINATION METER

Refer to 

MWI-19, "CONSULT Function (METER/M&A)"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Perform trouble diagnosis for DTC indicated.

3.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-49, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace combination meter. Refer to 

MWI-82, "Removal and Installation"

.

NO

>> Repair or replace.