Nissan Frontier D22. Manual - part 235

BASIC SERVICE PROCEDURE

EC-43

[KA24DE]

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10. 

CHECK HEATED OXYGEN SENSOR 1 SIGNAL

 With CONSULT-II

1.

See “HO2S1 MNTR (B1)” in “DATA MONITOR” mode.

2.

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

3.

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

 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 50 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.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 11.

11. 

CHECK HEATED OXYGEN SENSOR 1 HARNESS

1.

Stop engine and disconnect battery ground cable.

2.

Disconnect ECM harness connector.

3.

Disconnect heated oxygen sensor 1 harness connector.

4.

Check for continuity between terminal 50 of ECM harness connector and heated oxygen sensor 1 termi-
nal 2. Refer to wiring diagram.

5.

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

OK or NG

OK (With CONSULT-II)      >> GO TO 13.
OK (Without CONSULT-II) >> GO TO 14.
NG

>> 1. Repair or replace harness between ECM and heated oxygen sensor 1

2. GO TO 12.

1 time: RICH 

→ LEAN → RICH

2 times: RICH 

→ LEAN → RICH → LEAN → RICH

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

SEF820Y

AEC873A

Continuity should exist

EC-44

[KA24DE]

BASIC SERVICE PROCEDURE

12. 

PREPARATION FOR IDLE SPEED ADJUSTING

 With CONSULT-II

1.

Select “IGNITION TIMING ADJ” in “WORK SUPPORT” mode.

2.

Touch “START”.

 Without CONSULT-II

1.

Stop engine and disconnect throttle position sensor harness
connector.

2.

Start engine.

>> GO TO 6.

13. 

CHECK CO%

 With CONSULT-II

1.

Reconnect ECM harness connector and heated oxygen sensor 1 harness connector.

2.

Start engine warm it up until engine control temperature indicator points the middle of gauge.

3.

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

4.

Select “ENG COOLANT TEMP” in “ACTIVE TEST” mode.

5.

Set “COOLANT TEMP” to 5

°C (41°F) by touching “Qu” and “Qd”

and “UP”, “DOWN”.

6.

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

7.

Check CO%.

OK or NG

OK

>> GO TO 15.

NG

>> GO TO 16.

PEF546N

SEF265S

Idle CO

: 0.7 - 9.1%and engine runs smoothly.

SEF172Y

BASIC SERVICE PROCEDURE

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14. 

CHECK CO%

 Without CONSULT-II

1.

Reconnect ECM harness connector and heated oxygen sensor 1 harness connector.

2.

Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.

3.

Turn ignition switch OFF.

4.

Disconnect engine coolant temperature sensor harness connector.

5.

Connect a resistor (4.4 k

Ω) between terminals of engine coolant

temperature sensor harness connector.

6.

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

7.

Check CO%.

8.

After checking CO%, turn ignition switch OFF, disconnect the
resistor from the terminals of engine coolant temperature sensor
harness connector, and then connect engine coolant tempera-
ture sensor harness connector to engine coolant temperature
sensor.

OK or NG

OK

>> GO TO 15.

NG

>> GO TO 16.

15. 

CHECK HEATED OXYGEN SENSOR 1 SIGNAL

 With CONSULT-II

1.

Stop engine.

2.

Replace heated oxygen sensor 1.

3.

Restart engine and warm it up until engine coolant temperature indicator points the middle gauge.

4.

See “HO2S1 MNTR (B1)” in “DATA MONITOR” mode.

5.

Maintain 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.

 Without CONSULT-II

1.

Stop engine.

2.

Replace heated oxygen sensor 1.

3.

Restart 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 50 and ground.

6.

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

OK or NG

OK

>> GO TO 12.

NG

>> GO TO 16.

Idle CO:

0.7 

− 9.1% and engine runs smoothly.

SEF053RA

1 time: RICH 

→ LEAN → RICH

2 times: RICH 

→ LEAN → RICH → LEAN → RICH

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

SEF820Y

AEC873A

EC-46

[KA24DE]

BASIC SERVICE PROCEDURE

16. 

DETECT MALFUNCTIONING PART

1.

Stop engine.

2.

Connect heated oxygen sensor 1 harness connector.

3.

Check the following:

●

Check fuel pressure regulator and repair or replace if necessary. Refer to 

EC-48

 .

●

 Check mass air flow sensor and its circuit and repair or replace if necessary.
Refer to 

EC-136

 , 

EC-143

 .

●

Check injector and its circuit and repair or replace if necessary.
Refer to 

EC-539

 .

●

Check engine coolant temperature sensor and its circuit and repair or replace if necessary. 
Refer to 

EC-154

 , 

EC-174

 .

●

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

>> GO TO 12.

●

If a vehicle contains a part which is operating outside of design specifications with no MIL illumi-
nation, the part shall not be replaced prior to emission testing unless it is determined that the part
has been tampered with or abused in such a way that the diagnostic system cannot reasonably be
expected to detect the resulting malfunction.

Fuel Pressure Check

UBS00D15

FUEL PRESSURE RELEASE

 With CONSULT-II

1.

Turn ignition switch ON.

2.

Perform “FUEL PRESSURE RELEASE” in “WORK SUPPORT”
mode with CONSULT-II.

3.

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

4.

Turn ignition switch OFF.

LEC104A

PEF823K