Infiniti Q45. Manual - part 374

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-135

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TROUBLE DIAGNOSIS - SPECIFICATION VALUE

PFP:00031

Description

NBS002WI

The specification (SP) value indicates the tolerance of the value that is displayed in “DATA MONITOR (SPEC)”
mode of CONSULT-II during normal operation of the Engine Control System. When the value in “DATA MONI-
TOR (SPEC)” mode is within the SP value, the Engine Control System is confirmed OK. When the value in
“DATA MONITOR (SPEC)” mode is NOT within the SP value, the Engine Control System may have one or
more malfunctions.
The SP value is used to detect malfunctions that may affect the Engine Control System, but will not light the
MIL.
The SP value will be displayed for the following three items:

●

B/FUEL SCHDL (The fuel injection pulse width programmed into ECM prior to any learned on board cor-
rection)

●

A/F ALPHA-B1/B2 (The mean value of air-fuel ratio feedback correction factor per cycle)

●

MAS A/F SE-B1 (The signal voltage of the mass air flow sensor)

Testing Condition

NBS002WJ

●

Vehicle driven distance: More than 5,000 km (3,107 miles)

●

Barometric pressure: 98.3 - 104.3 kPa (1.003 - 1.064 kg/cm

2

 , 14.25 - 15.12 psi)

●

Atmospheric temperature: 20 - 30

°

C (68 - 86

°

F)

●

Engine coolant temperature: 75 - 95

°

C (167 - 203

°

F)

●

Transmission: Warmed-up*

1

●

Electrical load: Not applied*

2

●

Engine speed: Idle

*1: After the engine is warmed up to normal operating temperature, drive vehicle until “ATF TEMP SE 1” (A/T
fluid temperature sensor signal) indicates more than 60

°

C (140

°

F).

*2: Rear window defogger switch, air conditioner switch, lighting switch are OFF. Steering wheel is straight
ahead.

Inspection Procedure

NBS002WK

NOTE:
Perform “DATA MONITOR (SPEC)” mode in maximum scale display.

1.

Perform 

EC-71, "Basic Inspection"

 .

2.

Confirm that the testing conditions indicated above are met.

3.

Select “B/FUEL SCHDL”, “A/F ALPHA-B1”, “A/F ALPHA-B2”
and “MAS A/F SE-B1” in “DATA MONITOR (SPEC)” mode with
CONSULT-II.

4.

Make sure that monitor items are within the SP value.

5.

If NG, go to 

EC-136, "Diagnostic Procedure"

 .

SEF601Z

EC-136

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

Diagnostic Procedure

NBS002WL

OVERALL SEQUENCE

PBIB2268E

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-137

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PBIB2548E

EC-138

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

DETAILED PROCEDURE

1. 

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

1.

Start engine.

2.

Confirm that the testing conditions are met. Refer to 

EC-135, "Testing Condition"

 .

3.

Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “DATA MONITOR
(SPEC)” mode, and make sure that the each indication is within
the SP value.

NOTE:
Check “A/F ALPHA-B1”, “A/F ALPHA-B2” for approximately 1
minute because they may fluctuate. It is NG if the indication is
out of the SP value even a little.

OK or NG

OK

>> GO TO 17.

NG (Less than the SP value)>>GO TO 2.
NG (More than the SP value)>>GO TO 3.

2. 

CHECK “B/FUEL SCHDL”

Select “B/FUEL SCHDL” in “DATA MONITOR (SPEC)” mode, and
make sure that the indication is within the SP value.

OK or NG

OK

>> GO TO 4.

NG (More than the SP value)>>GO TO 19.

3. 

CHECK “B/FUEL SCHDL”

Select “B/FUEL SCHDL” in “DATA MONITOR (SPEC)” mode, and
make sure that the indication is within the SP value.

OK or NG

OK

>> GO TO 6.

NG (More than the SP value)>>GO TO 6.
NG (Less than the SP value)>>GO TO 25.

4. 

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

1.

Stop the engine.

2.

Disconnect PCV hose, and then plug it.

3.

Start engine.

4.

Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “DATA MONITOR (SPEC)” mode, and make sure that the
each indication is within the SP value.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 6.

PBIB2369E

PBIB2332E

PBIB2332E