Nissan Frontier D22. Instruction — part 376

BASIC SERVICE PROCEDURE

EC-607

[VG33E]

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EC

2.

CHECK IGNITION TIMING

1.

Run engine at about 2,000 rpm for about 2 minutes under no-load.

2.

Rev engine (2,000 to 3,000 rpm) two or three times under no-
load, then run engine at idle speed.

3.

Stop engine and disconnect throttle position sensor harness
connector.

4.

Start and rev engine (2,000 to 3,000 rpm) two or three times
under no-load, then run at idle speed.

5.

Check ignition timing with a timing light.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3.

ADJUST IGNITION TIMING

1.

Adjust ignition timing by turning distributor after loosening securing bolts.

2.

Stop engine and connect throttle position sensor harness con-
nector to throttle position sensor.

>> GO TO 2.

SEF978U

BBIA0424E

M/T: 10

±5° BTDC (in Neutral position)

A/T: 10

±5° BTDC (in P or N position)

SEF927Z

BBIA0425E

EC-608

[VG33E]

BASIC SERVICE PROCEDURE

4.

CHECK BASE IDLE SPEED

With CONSULT-II

1.

Read idle speed in “DATA MONITOR” mode with CONSULT-II.

Without CONSULT-II

1.

Check idle speed.

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 5.

5.

ADJUST BASE IDLE SPEED

1.

Rev engine (2,000 to 3,000 rpm) 2 or 3 times under no-load then run engine at idle speed.

2.

Adjust idle speed by turning idle speed adjusting screw.

>> GO TO 6.

6.

CHECK TARGET IDLE SPEED

With CONSULT-II

1.

Stop engine and connect throttle position sensor harness connector.

2.

Start and rev engine (2,000 to 3,000 rpm) 2 or 3 times under no-load then run at idle speed.

3.

Read idle speed in “DATA MONITOR” mode with CONSULT-II.

Without CONSULT-II

1.

Stop engine and connect throttle position sensor harness con-
nector.

2.

Start and rev engine (2,000 to 3,000 rpm) 2 or 3 times under no-
load then run at idle speed.

3.

Check idle speed.

OK or NG

OK (With CONSULT-II)>>GO TO 8.
OK (Without CONSULT-II)>>GO TO 9.
NG

>> GO TO 7.

M/T: 700

±50 rpm (in Neutral position)

A/T: 700

±50 rpm (in P or N position)

M/T: 700

±50 rpm (in Neutral position)

A/T: 700

±50 rpm (in P or N position)

SEF058Y

M/T: 700

±50 rpm (in Neutral position)

A/T: 700

±50 rpm (in P or N position)

LEC513

M/T: 750

±50 rpm (in Neutral position)

A/T: 750

±50 rpm (in P or N position)

M/T: 750

±50 rpm (in Neutral position)

A/T: 750

±50 rpm (in P or N position)

SEF058Y

BASIC SERVICE PROCEDURE

EC-609

[VG33E]

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EC

7.

DETECT MALFUNCTIONING PART

Check the following.

1.

Check IACV-AAC valve and replace if necessary. Refer to

EC-985

.

2.

Check IACV-AAC valve harness and repair if necessary. Refer to

EC-985

.

3.

Check ECM function by substituting another known-good ECM.
(ECM may be the cause of an incident, but this is a rare case.)

With CONSULT-II>>GO TO 8.
Without CONSULT-II>>GO TO 9.

8.

CHECK HEATED OXYGEN SENSOR 1 (BANK 2) SIGNAL

With CONSULT-II

1.

Run engine at about 2,000 rpm for about 2 minutes under no load.

2.

See “HO2S1 MNTR (B2)” in “DATA MONITOR” mode.

3.

Running engine at 2,000 rpm under no-load (engine is warmed
up to normal operating temperature.), check that the monitor
fluctuates between “LEAN” and “RICH” more than 5 times dur-
ing 10 seconds.

OK or NG

OK

>> GO TO 12.

NG (Monitor does not fluctuate.)>>GO TO 17.
NG (Monitor fluctuates less than 5 times.)>>GO TO 10.

9.

CHECK HEATED OXYGEN SENSOR 1 (BANK 2) SIGNAL

Without CONSULT-II

1.

Run engine at about 2,000 rpm for about 2 minutes under no
load.

2.

Set voltmeter probe between ECM terminal 51 and ground.

3.

Make sure that the voltage fluctuates between 0 - 0.3V and 0.6 -
1.0V more than 5 times during 10 seconds at 2,000 rpm.
1 time: 0 - 0.3V

→ 0.6 - 1.0V → 0 - 0.3V

2 times: 0 - 0.3V

→ 0.6 - 1.0V → 0 - 0.3V → 0.6 - 1.0V → 0 -

0.3V

OK or NG

OK

>> GO TO 12.

NG (Voltage does not fluctuate.)>>GO TO 17.
NG (Voltage fluctuates less than 5 times.)>>GO TO 10.

1 time: RICH

→ LEAN → RICH

2 times: RICH

→ LEAN → RICH → LEAN → RICH

PBIB0120E

PBIB2157E

EC-610

[VG33E]

BASIC SERVICE PROCEDURE

10.

CHECK HEATED OXYGEN SENSOR 1 (BANK 2) SIGNAL

With CONSULT-II

1.

Stop engine.

2.

Replace heated oxygen sensor 1 (bank 2).

3.

Start engine and warm it up to normal operating temperature.

4.

Run engine at approx. 2,000 rpm for approx. 2 minutes under no-load.

5.

See “HO2S1 MNTR (B2)” in “DATA MONITOR” mode.

6.

Running engine at 2,000 rpm under no load (engine is warmed
up to normal operating temperature.), check that the monitor
fluctuates between “LEAN” and “RICH” more than 5 times dur-
ing 10 seconds.
1 time: RICH

→ LEAN → RICH

2 times: RICH

→ LEAN → RICH → LEAN → RICH

Without CONSULT-II

1.

Stop engine.

2.

Replace heated oxygen sensor 1 (bank 2).

3.

Start engine and warm it up to normal operating temperature.

4.

Run engine at approx. 2,000 rpm for approx. 2 minutes under no
load.

5.

Set voltmeter probe between ECM terminal 51 and ground.

6.

Make sure that the voltage fluctuates between 0 - 0.3V and 0.6 -
1.0V more than 5 times during 10 seconds at 2,000 rpm.
1 time: 0 - 0.3V

→ 0.6 - 1.0V → 0 - 0.3V

2 times: 0 - 0.3V

→ 0.6 - 1.0V → 0 - 0.3V → 0.6 - 1.0V → 0 -

0.3V

OK or NG

OK (With CONSULT-II)>>GO TO 12.
OK (Without CONSULT-II)>>GO TO 13.
NG

>> GO TO 11.

11.

DETECT MALFUNCTIONING PART

Check the following.

1.

Check fuel pressure regulator. Refer to

EC-617

.

2.

Check mass air flow sensor and its circuit. Refer to

EC-720

.

3.

Check injector and its circuit. Refer to

EC-1140

.

Clean or replace if necessary.

4.

Check engine coolant temperature sensor and its circuit. Refer to

EC-738

.

5.

Check ECM function by substituting another known-good ECM.
(ECM may be the cause of an incident, but this is a rare case.)

>> GO TO 2.

PBIB0120E

PBIB2157E