Infiniti F50. Manual - part 351

 

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Infiniti F50. Manual - part 351

 

 

BASIC SERVICE PROCEDURE

EC-45

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31. 

REPLACE HEATED OXYGEN SENSOR 1

1.

Stop engine.

2.

Replace heated oxygen sensor 1 on the malfunctioning bank.

With CONSULT-II>>GO TO 32.
Without CONSULT-II>>GO TO 33.

32. 

CHECK HEATED OXYGEN SENSOR 1 (BANK 1) / (BANK 2) SIGNAL

 With CONSULT-II

1.

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

2.

See “HO2S1 MNTR (B1)/(B2)” 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 

4.

NG

>> GO TO 34.

33. 

CHECK HEATED OXYGEN SENSOR 1 (BANK 1) / (BANK 2) SIGNAL

 Without CONSULT-II

1.

Set ECM to Self Diagnostic Test Mode II (Heated oxygen sensor 1 monitor). Refer to 

EC-66, "HOW TO

SWITCH DIAGNOSTIC TEST MODE"

 .

2.

Switch the monitored sensor to the malfunctioning bank. Refer to 

EC-67, "How to Switch Monitored Sen-

sor From Bank 1 to Bank 2 or Vice Versa"

 .

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 4.

NG

>> GO TO 34.

34. 

DETECT MALFUNCTIONING PART

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-179

 .

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

EC-653

 .

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

EC-

190

  an

EC-201

 .

OK or NG

OK

>> GO TO 36.

NG

>> 1. Repair or replace.

2. GO TO 35.

1 time:

RICH 

 LEAN 

 RICH

2 times:

RICH 

 LEAN 

 RICH 

 LEAN 

 RICH

PBIB0120E

EC-46

BASIC SERVICE PROCEDURE

35. 

ERASE UNNECESSARY DTC

After this inspection, unnecessary DTC might be displayed.
Erase the stored memory in ECM and TCM. Refer to 

EC-63, "HOW TO ERASE EMISSION-RELATED DIAG-

NOSTIC INFORMATION"

  and 

AT-39

 .

>> GO TO 4.

36. 

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.

Accelerator Pedal Released Position Learning

EBS00LVK

DESCRIPTION

“Accelerator Pedal Released Position Learning” is an operation to learn the fully released position of the accel-
erator pedal by monitoring the accelerator pedal position sensor output signal. It must be performed each time
harness connector of accelerator pedal position sensor or ECM is disconnected.

OPERATION PROCEDURE

1.

Make sure that accelerator pedal is fully released.

2.

Turn ignition switch “ON” and wait at least 2 seconds.

3.

Turn ignition switch “OFF” and wait at least 10 seconds.

4.

Turn ignition switch “ON” and wait at least 2 seconds.

5.

Turn ignition switch “OFF” and wait at least 10 seconds.

Throttle Valve Closed Position Learning

EBS00LVL

DESCRIPTION

“Throttle Valve Closed Position Learning” is an operation to learn the fully closed position of the throttle valve
by monitoring the throttle position sensor output signal. It must be performed each time harness connector of
electric throttle control actuator or ECM is disconnected.

OPERATION PROCEDURE

1.

Make sure that accelerator pedal is released.

2.

Turn ignition switch “ON”.

3.

Turn ignition switch “OFF” and wait at least 10 seconds.
Make sure that throttle valve moves during above 10 seconds by confirming the operating sound.

Idle Air Volume Learning

EBS00LVM

DESCRIPTION

“Idle Air Volume Learning” is an operation to learn the idle air volume that keeps each engine within the spe-
cific range. It must be performed under any of the following conditions:

Each time electric throttle control actuator or ECM is replaced.

Idle speed or ignition timing is out of specification.

PREPARATION

Before performing “Idle Air Volume Learning”, make sure that all of the following conditions are satisfied.
Learning will be cancelled if any of the following conditions are missed for even a moment.

Battery voltage: More than 12.9V (At idle)

Engine coolant temperature: 70 - 99

°

C (158 - 210

°

F)

PNP switch: ON

Electric load switch: OFF
(Air conditioner, headlamp, rear window defogger)

BASIC SERVICE PROCEDURE

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On vehicles equipped with daytime light systems, if the parking brake is applied before the engine
is started the headlamp will not be illuminated.

Steering wheel: Neutral (Straight-ahead position)

Vehicle speed: Stopped

Transmission: Warmed-up
For models with CONSULT-II, drive vehicle until “ATF TEMP SE1” in “DATA MONITOR” mode of “A/T”
system indicates less than 0.9V.
For models without CONSULT-II, drive vehicle for 10 minutes.

OPERATION PROCEDURE

 With CONSULT-II

1.

Perform 

EC-46, "Accelerator Pedal Released Position Learning"

 .

2.

Perform 

EC-46, "Throttle Valve Closed Position Learning"

 .

3.

Start engine and warm it up to normal operating temperature.

4.

Check that all items listed under the topic “PREPARATION” (previously mentioned) are in good order.

5.

Select “IDLE AIR VOL LEARN” in “WORK SUPPORT” mode.

6.

Touch “START” and wait 20 seconds.

7.

Make sure that “CMPLT” is displayed on CONSULT-II screen. If
“CMPLT” is not displayed, “Idle Air Volume Learning” will not be
carried out successfully. In this case, find the cause of the inci-
dent by referring to the “DIAGNOSTIC PROCEDURE” below.

8.

Rev up the engine two or three times and make sure that idle
speed and ignition timing are within the specifications.

 Without CONSULT-II

NOTE:

It is better to count the time accurately with a clock.

It is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit
has a malfunction.

1.

Perform 

EC-46, "Accelerator Pedal Released Position Learning"

 .

SEF217Z

SEF454Y

ITEM

SPECIFICATION

Idle speed

650 

±

 50 rpm (in “P” or “N” position)

Ignition timing

12 

±

 5

°

 BTDC (in “P” or “N” position)

MBIB0238E

EC-48

BASIC SERVICE PROCEDURE

2.

Perform 

EC-46, "Throttle Valve Closed Position Learning"

 .

3.

Start engine and warm it up to normal operating temperature.

4.

Check that all items listed under the topic “PREPARATION” (previously mentioned) are in good order.

5.

Turn ignition switch “OFF” and wait at least 10 seconds.

6.

Confirm that accelerator pedal is fully released, turn ignition switch “ON” and wait 3 seconds.

7.

Repeat the following procedure quickly five times within 5 seconds.

a.

Fully depress the accelerator pedal.

b.

Fully release the accelerator pedal.

8.

Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 20 seconds until the MIL stops
blinking and turned ON.

9.

Fully release the accelerator pedal within 3 seconds after the MIL turned ON.

10. Start engine and let it idle.

11. Wait 20 seconds.

12. Rev up the engine two or three times and make sure that idle speed and ignition timing are within the

specifications.

13. If idle speed and ignition timing are not within the specification, “Idle Air Volume Learning” will not be car-

ried out successfully. In this case, find the cause of the incident by referring to the “Diagnostic Procedure”
below.

DIAGNOSTIC PROCEDURE

If idle air volume learning cannot be performed successfully, proceed as follows:

1.

Check that throttle valve is fully closed.

2.

Check PCV valve operation.

3.

Check that downstream of throttle valve is free from air leakage.

4.

When the above three items check out OK, engine component parts and their installation condi-
tion are questionable. Check and eliminate the cause of the incident.
 
It is useful to perform 

EC-128, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE"

 .

5.

If any of the following conditions occur after the engine has started, eliminate the cause of the
incident and perform “Idle Air Volume Learning” all over again:

Engine stalls.

Erroneous idle.

Fuel Pressure Check

EBS00LVN

FUEL PRESSURE RELEASE

 With CONSULT-II

1.

Turn ignition switch “ON”.

ITEM

SPECIFICATION

Idle speed

650 

±

 50 rpm (in “P” or “N” position)

Ignition timing

12 

±

 5

°

 BTDC (in “P” or “N” position)

SEC897C

 

 

 

 

 

 

 

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