Infiniti M45 (Y34). Manual - part 359

TROUBLE DIAGNOSIS

EC-125

C

D

E

F

G

H

I

J

K

L

M

A

EC

*: Accelerator pedal position sensor 2 signal and throttle position sensor 2 signal are converted by ECM internally. Thus, they differ from
ECM terminals voltage signal.

FUEL PUMP RLY

●

For 5 seconds after turning ignition switch ON

●

Engine running or cranking

ON

●

Except above

OFF

FPCM

●

Engine: Cranking

HI

●

Engine: Idle

●

Engine coolant temperature: More than 10

°

C (50

°

F)

LOW

VC/V BYPAS S/V

●

Ignition switch: ON

OFF

VENT CONT/V

●

Ignition switch: ON

OFF

THRTL RELAY

●

Ignition switch: ON

ON

HO2S1 HTR (B1)
HO2S1 HTR (B2)

●

Engine: After warming up

●

Engine speed: Below 3,000 rpm

ON

●

Engine speed: Above 3,000 rpm

OFF

HO2S2 HTR (B1)
HO2S2 HTR (B2)

●

Engine is running below 3,600 rpm after the following conditions are met.

–

Engine: After warming up

–

Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at 
idle for 1 minute under no load

ON

●

Engine speed: Above 3,600 rpm

OFF

TRVL AFTER MIL

●

Ignition switch: ON

Vehicle has traveled after MIL has turned 
ON.

0 - 65,535 km
(0 - 40,723 mile)

TRGT FAN RPM

●

Ignition switch: ON
 (Engine stopped)

0 rpm

●

Engine: Idle

300 - 2,550 rpm

AC PRESS SEN

●

Engine: Idle

●

Both A/C switch and blower switch are ON
(Compressor operates.)

1.0 - 4.0V

MONITOR ITEM

CONDITION

SPECIFICATION

EC-126

TROUBLE DIAGNOSIS

Major Sensor Reference Graph in Data Monitor Mode

ABS002DX

The following are the major sensor reference graphs in “DATA MONITOR” mode.

CLSD THL POS, ACCEL SEN 1, THRTL SEN 1

Below is the data for “CLSD THL POS”, “ACCEL SEN 1” and “THRTL SEN 1” when depressing the accelera-
tor pedal with the ignition switch ON and with selector lever in D position.
The signal of “ACCEL SEN 1” and “THRTL SEN 1” should rise gradually without any intermittent drop or rise
after “CLSD THL POS” is changed from “ON” to “OFF”.

ENG SPEED, MAS A/F SE-B1, THRTL SEN 1, HO2S2 (B1), HO2S1 (B1), INJ PULSE-B1

Below is the data for “ENG SPEED”, “MAS A/F SE-B1”, “THRTL SEN 1”, “HO2S2 (B1)”, “HO2S1 (B1)” and
“INJ PULSE-B1” when revving engine quickly up to 4,800 rpm under no load after warming up engine suffi-
ciently.
Each value is for reference, the exact value may vary.

PBIB0198E

SEF241Y

TROUBLE DIAGNOSIS

EC-127

C

D

E

F

G

H

I

J

K

L

M

A

EC

PBIB0668E

EC-128

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

PFP:00031

Description

ABS002DY

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

ABS002DZ

●

Vehicle driven distance: More than 5,000 km (3,017 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 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

ABS002E0

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

1.

Perform 

EC-81, "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-129, "Diagnostic Procedure"

 .

SEF601Z