Infiniti Q45. Manual - part 359

BASIC SERVICE PROCEDURE

EC-75

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15. 

CHECK IGNITION TIMING AGAIN

1.

Run engine at idle.

2.

Check ignition timing with a timing light. Refer to 

EC-76

 .

OK or NG

OK

>> GO TO 19.

NG

>> GO TO 16.

16. 

CHECK TIMING CHAIN INSTALLATION

Check timing chain installation. Refer to 

EM-39, "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-379

 .

●

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

EC-370

 .

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-202, "ECM Re-Communicating Function"

 .

>> GO TO 4.

19. 

INSPECTION END

Did you replace ECM, referring this Basic Inspection procedure?

Yes or No

Yes

>> 1. Perform 

EC-77, "VIN Registration"

 .

2. INSPECTION END

No

>> INSPECTION END

12 

±

 5

°

 BTDC (in P or N position)

PBIB2435E

EC-76

BASIC SERVICE PROCEDURE

Idle Speed and Ignition Timing Check

NBS001QS

IDLE SPEED

 With CONSULT-II

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

 With GST

Check idle speed with GST.

IGNITION TIMING

Any of following two methods may be used.

Method A

1.

Attach timing light to loop wire as shown.

2.

Check ignition timing.

Method B

1.

Remove ignition coil No. 1.

2.

Connect ignition coil No. 1 and spark plug No. 1 with suitable
high-tension wire as shown, and attach timing light clamp to this
wire.

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PBIB2436E

PBIB2424E

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BASIC SERVICE PROCEDURE

EC-77

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3.

Check ignition timing.

VIN Registration

NBS001QU

DESCRIPTION

VIN Registration is an operation to registering VIN in ECM. It must be performed each time ECM is replaced.
NOTE:
Accurate VIN which is registered in ECM may be required for Inspection & Maintenance (I/M).

OPERATION PROCEDURE

 With CONSULT-II

1.

Check the VIN of the vehicle and note it. Refer to 

GI-46, "IDENTIFICATION INFORMATION"

 .

2.

Turn ignition switch ON and engine stopped.

3.

Select “VIN REGISTRATION” in “WORK SUPPORT” mode.

4.

Follow the instruction of CONSULT-II display.

Accelerator Pedal Released Position Learning

NBS001QV

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.

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EC-78

BASIC SERVICE PROCEDURE

Throttle Valve Closed Position Learning

NBS001QW

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 fully 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

NBS001QX

DESCRIPTION

Idle Air Volume Learning is an operation to learn the idle air volume that keeps each engine within the specific
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)
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

–

With CONSULT-II: Drive vehicle until “ATF TEMP SE 1” in “DATA MONITOR” mode of “A/T” system indi-
cates less than 0.9V.

–

Without CONSULT-II: Drive vehicle for 10 minutes.

OPERATION PROCEDURE

 With CONSULT-II

1.

Perform 

EC-77, "Accelerator Pedal Released Position Learning"

 .

2.

Perform 

EC-78, "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.

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