Nissan Frontier D22. Manual - part 358

IGNITION SIGNAL

EC-535

[KA24DE]

C

D

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F

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EC

2. 

CHECK OVERALL FUNCTION

With CONSULT-II

1.

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

2.

Make sure that all circuits do not produce a momentary engine
speed drop.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 7.

3. 

CHECK OVERALL FUNCTION

 Without CONSULT-II

1.

Let engine idle.

2.

Read the voltage signal between ECM terminal 1 and ground with an oscilloscope.

3.

Verify that the oscilloscope screen shows the signal wave as shown below.

OK or NG

OK

>> INSPECTION END

 NG

>> GO TO 7.

SEF981Z

SEF984Z

EC-536

[KA24DE]

IGNITION SIGNAL

4. 

CHECK POWER SUPPLY

1.

Turn ignition switch OFF.

2.

Disconnect distributor harness connector F17.

3.

 Turn ignition switch ON.

4.

Check voltage between ignition coil terminal 7 and ground with
CONSULT-II or tester.

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 5.

5. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E43, M65

●

Harness connectors M59, F27

●

Harness for open or short between ignition coil and ignition switch

>> Repair harness or connectors.

6. 

CHECK GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect distributor harness connector F13.

3.

Check harness continuity between power transistor terminal 2 and engine ground.
Refer to Wiring Diagram.

4.

Also check harness for short to power.

OK or NG

OK

>> GO TO 7.

NG

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

SEF344V

Voltage

: Battery voltage

AEC698

Continuity should exist.

IGNITION SIGNAL

EC-537

[KA24DE]

C

D

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EC

7. 

CHECK OUTPUT SIGNAL CIRCUIT

1.

Stop engine.

2.

Disconnect distributor harness connector F13.

3.

Disconnect ECM harness connector.

4.

Check harness continuity between ECM terminal 1 and power
transistor terminal 1.
Refer to Wiring Diagram.

5.

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

OK or NG

OK

>> GO TO 8.

NG

>> Repair open circuit or short to ground or short to power

in harness or connectors.

8. 

CHECK IGNITION COIL

1.

Remove distributor cap.

2.

Check resistance as shown in the figure.

OK or NG

OK

>> GO TO 9.

NG

>> Replace distributor assembly as a unit.

9. 

CHECK POWER TRANSISTOR

1.

Disconnect distributor harness connector F17.

2.

Check power transistor resistance between terminals 2 and 8.

OK or NG

OK

>> GO TO 10.

NG

>> Replace distributor assembly.

Continuity should exist.

SEF344V

Terminal

Resistance [at 25

°C (77°F)]

7 - 8

Less than 1

Ω

7 - 9

7 - 13

Ω

AEC150A

Terminals

Resistance

Result

2 and 8

Except 0

Ω

OK

0

Ω

NG

AEC151A

EC-538

[KA24DE]

IGNITION SIGNAL

10. 

CHECK INPUT SIGNAL CIRCUIT

1.

Strip tape covering resistor.

2.

Disconnect resistor harness connector.

3.

Check harness continuity between ignition coil terminal 8 and
resistor terminal 1, resistor terminal 2 and ECM terminal 2.

4.

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

OK or NG

OK

>> GO TO 11.

NG

>> Repair open circuit or short to ground or short to power

in harness or connectors.

11. 

CHECK RESISTOR

Check resistance between resistor terminals 1 and 2.

OK or NG

OK

>> GO TO 12. 

NG

>> Replace resistor.

12. 

CHECK INTERMITTENT INCIDENT

Perform 

EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Removal and Installation

UBS00DD3

DISTRIBUTOR

Refer to 

EM-13, "OUTER COMPONENT PARTS"

 .

Continuity should exist.

SEF344V

Resistance

: Approximately 2.2 k

Ω [at 25°C (77°F)]

SEF240V