Infiniti F50. Manual - part 350

BASIC SERVICE PROCEDURE

EC-41

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15. 

CHECK IGNITION TIMING AGAIN

1.

Run engine at idle.

2.

Check ignition timing with a timing light.

OK or NG

OK (With CONSULT-II)>>GO TO 19.
OK (Without CONSULT-II)>>GO TO 20.
NG

>> GO TO 16.

16. 

CHECK TIMING CHAIN INSTALLATION

Check timing chain installation. Refer to 

EM-35, "TIMING CHAIN"

 .

OK or NG

OK

>> GO TO 17.

NG

>> 1. Repair the timing chain installation.

2. GO TO 4.

17. 

DETECT MALFUNCTIONING PART

Check the following.

●

Check camshaft position sensor (PHASE) and circuit. refer to 

EC-315

 .

●

Check crankshaft position sensor (POS) and circuit. refer to 

EC-307

 .

OK or NG

OK

>> GO TO 18.

NG

>> 1. Repair or replace.

2. GO TO 4.

18. 

CHECK ECM FUNCTION 

1.

Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but
this is a rare case.)

2.

Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs. Refer to

BL-200, "ECM Re-communicating Function"

 .

>> GO TO 4.

12 

±

 5

°

 BTDC (in “P” or “N” position)

PBIB1242E

EC-42

BASIC SERVICE PROCEDURE

19. 

CHECK HEATED OXYGEN SENSOR 1 (BANK 1) SIGNAL

 With CONSULT-II

1.

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

2.

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

3.

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

OK or NG

OK

>> GO TO 21.

NG (Monitor does not fluctuate.)>>GO TO 23.
NG (Monitor fluctuates less than 5 times.)>>GO TO 31.

20. 

CHECK HEATED OXYGEN SENSOR 1 (BANK 1) SIGNAL

 Without CONSULT-II

1.

Stop engine and set ECM to Self Diagnostic Test Mode II (Heated oxygen sensor 1 monitor). Refer to 

EC-

66, "HOW TO SWITCH DIAGNOSTIC TEST MODE"

 .

2.

Start engine and run it at about 2,000 rpm for about 2 minutes under no load.

3.

Running engine at 2,000 rpm under no load (The engine is warmed up to normal operating temperature.),
check that the MIL comes on more than 5 times during 10 seconds.

OK or NG

OK

>> GO TO 22.

NG (MIL does not come on)>>GO TO 23.
NG (MIL comes on less than 5 times)>>GO TO 31.

21. 

CHECK HEATED OXYGEN SENSOR 1 (BANK 2) SIGNAL

 With CONSULT-II

1.

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

2.

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

OK or NG

OK

>> INSPECTION END

NG (Monitor does not fluctuate.)>>GO TO 24.
NG (Monitor fluctuates less than 5 times.)>>GO TO 31.

1 time:

RICH 

→

 LEAN 

→

 RICH

2 times:

RICH 

→

 LEAN 

→

 RICH 

→

 LEAN 

→

 RICH

PBIB0120E

1 time:

RICH 

→

 LEAN 

→

 RICH

2 times:

RICH 

→

 LEAN 

→

 RICH 

→

 LEAN 

→

 RICH

PBIB0120E

BASIC SERVICE PROCEDURE

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22. 

CHECK HEATED OXYGEN SENSOR 1 (BANK 2) SIGNAL

 Without CONSULT-II

1.

Switch the monitored sensor from bank 1 to bank 2. Refer to 

EC-67, "How to Switch Monitored Sensor

From Bank 1 to Bank 2 or Vice Versa"

 .

2.

Running engine at 2,000 rpm under no load (The engine is warmed up to normal operating temperature.),
check that the MIL comes on more than 5 times during 10 seconds.

OK or NG

OK

>> INSPECTION END

NG (MIL does not come on)>>GO TO 24.
NG (MIL comes on less than 5 times)>>GO TO 31.

23. 

CHECK HEATED OXYGEN SENSOR 1 (BANK 1) HARNESS

1.

Turn ignition switch “OFF” and disconnect battery ground cable.

2.

Disconnect ECM harness connector.

3.

Disconnect heated oxygen sensor 1 (bank 1) harness connector.

4.

Check harness continuity between ECM terminal 114 and heated oxygen sensor 1 (bank 1) terminal 1.
Refer to Wiring Diagram, 

EC-214, "BANK 1"

 .

5.

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

OK or NG

OK

>> GO TO 25.

NG

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

2. GO TO 4.

24. 

CHECK HEATED OXYGEN SENSOR 1 (BANK 2) HARNESS

1.

Turn ignition switch “OFF” and disconnect battery ground cable.

2.

Disconnect ECM harness connector.

3.

Disconnect heated oxygen sensor 1 (bank 2) harness connector.

4.

Check harness continuity between ECM terminal 115 and heated oxygen sensor 1 (bank 2) terminal 1.
Refer to Wiring Diagram, 

EC-216, "BANK 2"

 .

5.

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

OK or NG

OK

>> GO TO 25.

NG

>> 1. Repair or replace harness between ECM and heated oxygen sensor 1 (bank 2).

2. GO TO 4.

25. 

PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING

1.

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

2.

Perform 

EC-46, "Accelerator Pedal Released Position Learning"

 .

>> GO TO 26.

26. 

PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Perform 

EC-46, "Throttle Valve Closed Position Learning"

 .

>> GO TO 27.

Continuity should exist.

Continuity should exist.

EC-44

BASIC SERVICE PROCEDURE

27. 

PERFORM IDLE AIR VOLUME LEARNING

Refer to 

EC-46, "Idle Air Volume Learning"

 .

Is Idle Air Volume Learning carried out successfully?

Yes or No

Yes (With CONSULT-II)>>GO TO 28.
Yes (Without CONSULT-II)>>GO TO 29.
No

>> 1. Follow the instruction of “Idle Air Volume Learning”.

2. GO TO 4.

28. 

CHECK “CO” %

 With CONSULT-II

1.

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

2.

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

3.

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

4.

Set “ENG COOLANT TEMP” to 5

°

C (41

°

F) by touching “DOWN”

and “Qd”.

5.

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

6.

Check “CO” %.

OK or NG

OK

>> GO TO 31.

NG

>> GO TO 30.

29. 

CHECK “CO” %

 Without CONSULT-II

1.

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

2.

Turn ignition switch “OFF”.

3.

Disconnect engine coolant temperature sensor harness connector.

4.

Connect a resistor (4.4 k

Ω

) between terminals of engine coolant

temperature sensor harness connector.

5.

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

6.

Check “CO” %.

7.

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
temperature sensor harness connector to engine coolant tem-
perature sensor.

OK or NG

OK

>> GO TO 31.

NG

>> GO TO 30.

30. 

RECONNECT HEATED OXYGEN SENSOR 1 HARNESS CONNECTOR

1.

Turn ignition switch “OFF”.

2.

Reconnect heated oxygen sensor 1 harness connector.

>> GO TO 34.

Idle CO:

0.7 

−

 9.9 % and engine runs smoothly.

SEF172Y

Idle CO:

0.7 

−

 9.9 % and engine runs smoothly.

SEF982UA