Nissan Frontier. Instruction — part 469

IGNITION SIGNAL

EC-447

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

OK or NG

OK

>> GO TO 5.

NG

>> Go to

EC-146

.

5.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II

1. Turn ignition switch OFF.

2. Disconnect condenser-1 harness connector.

3. Turn ignition switch ON.

4. Check voltage between condenser-1 terminal 1 and ground with

CONSULT or tester.

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 6.

6.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R harness connector E119.

3. Check harness continuity between IPDM E/R terminal 3 and condenser-1 terminal 1.

Refer to Wiring Diagram.

4. Also check harness for short to ground and short to power.
OK or NG

OK

>> GO TO 15.

NG

>> GO TO 7.

7.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E2, F32

• Harness for open or short between condenser-1 and IPDM E/R

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

8.

CHECK CONDENSER-1 GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Check harness continuity between condenser-1 terminal 2 and ground.

Refer to Wiring Diagram.

3. Also check harness for short to power.
OK or NG

BBIA0628E

Voltage: Battery voltage

PBIB0624E

Continuity should exist.

Continuity should exist.

EC-448

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

IGNITION SIGNAL

OK

>> GO TO 9.

NG

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

9.

CHECK CONDENSER-1

Refer to

EC-449, "Component Inspection"

.

OK or NG

OK

>> GO TO 10.

NG

>> Replace condenser-1.

10.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-IV

1. Turn ignition switch OFF.

2. Reconnect all harness connectors disconnected.

3. Disconnect ignition coil harness connector.

4. Turn ignition switch ON.

5. Check voltage between ignition coil terminal 3 and ground with

CONSULT or tester.

OK or NG

OK

>> GO TO 12.

NG

>> GO TO 11.

11.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connector E2, F32

• Harness for open or short between ignition coil and IPDM E/R.

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

12.

CHECK IGNITION COIL GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Check harness continuity between ignition coil terminal 2 and ground.

Refer to Wiring Diagram.

3. Also check harness for short to power.
OK or NG

OK

>> GO TO 13.

NG

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

13.

CHECK IGNITION COIL OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Disconnect ECM harness connector.

2. Check harness continuity between ECM terminals 9, 10, 11, 21 and ignition coil terminal 1.

Refer to Wiring Diagram.

BBIA0604E

Voltage: Battery voltage

PBIB0138E

Continuity should exist.

IGNITION SIGNAL

EC-449

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

3. Also check harness for short to ground and short to power.
OK or NG

OK

>> GO TO 14.

NG

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

14.

CHECK IGNITION COIL WITH POWER TRANSISTOR

Refer to

EC-449, "Component Inspection"

.

OK or NG

OK

>> GO TO 15.

NG

>> Replace ignition coil with power transistor. Refer to

EM-36, "Exploded View"

.

15.

CHECK INTERMITTENT INCIDENT

Refer to

GI-42, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000009481157

IGNITION COIL WITH POWER TRANSISTOR

CAUTION:

Do the following procedure in the place where ventilation is good without the combustible.

1. Turn ignition switch OFF.

2. Disconnect ignition coil harness connector.

3. Check resistance between ignition coil terminals as follows.

4. If NG, Replace ignition coil with power transistor. Refer to

EM-

36, "Exploded View"

.

If OK, go to next step.

5. Turn ignition switch OFF.

6. Reconnect all harness connectors disconnected.

7. 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 procedure.

8. Start engine.

9. After engine stalls, crank it two or three times to release all fuel

pressure.

10. Turn ignition switch OFF.

11. Remove ignition coil harness connectors to avoid the electrical

discharge from the ignition coils.

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

checked.

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

14. Connect spark plug and harness connector to ignition coil.

Continuity should exist.

Terminal No. (Polarity)

Resistance

Ω [at 25°C (77°F)]

1 and 2

Except 0 or

∞

1 and 3

Except 0

2 and 3

PBIB0847E

BBIA0534E

EC-450

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

IGNITION SIGNAL

15. Fix ignition coil using a rope etc. with gap of 13 - 17 mm

between the edge of the spark plug and grounded metal portion

as shown in the figure.

16. Crank engine for about three seconds, and check whether spark

is generated between the spark plug and the grounded part.

CAUTION:

• Never approach to the spark plug and the ignition coil

within 50cm. Be careful not to get an electrical shock

while checking, because the electrical discharge voltage

becomes 20kV or more.

• It might cause to damage the ignition coil if the gap of more than 17 mm is taken.

NOTE:

When the gap is less than 13 mm, the spark might be generated even if the coil is malfunctioning.

17. If NG, Replace ignition coil with power transistor. Refer to

EM-36, "Exploded View"

.

CONDENSER-1

1. Turn ignition switch OFF.
2. Disconnect condenser-1 harness connector.
3. Check resistance between condenser-1 terminals 1 and 2.

Spark should be generated.

PBIB2325E

Resistance: Above 1 M

Ω [at 25°C (77°F)]

PBIB0794E