Infiniti M35/M45 Y50. Manual - part 413

TROUBLE DIAGNOSIS

EC-125

[VQ35DE]

X: Applicable
*1: This item includes 1st trip DTCs.
*2: This mode includes 1st trip freeze frame data or freeze frame data. The items appear on CONSULT-II screen in freeze frame data
mode only if a 1st trip DTC or DTC is detected. For details, refer to

EC-60, "FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME

DATA"

*3: Always “CMPLT” is displayed.

INSPECTION PROCEDURE

Refer to

GI-38, "CONSULT-II Start Procedure"

WORK SUPPORT MODE
Work Item

ENGINE

COMPONENT P

ARTS

OUTPUT

Fuel injector

Power transistor (Ignition timing)

Throttle control motor relay

Throttle control motor

EVAP canister purge volume con-
trol solenoid valve

FPCM

Air conditioner relay

Fuel pump relay

Cooling fan relay

Air fuel ratio (A/F) sensor 1 heater

Heated oxygen sensor 2 heater

EVAP canister vent control valve

Intake valve timing control solenoid
valve

Alternator

Calculated load value

Item

DIAGNOSTIC TEST MODE

WORK

SUP-

PORT

SELF-DIAGNOS-

TIC RESULTS

DATA

MONI-

TOR

DATA

MONI-

TOR

(SPEC)

ACTIVE

TEST

DTC & SRT

CONFIRMATION

DTC*1

FREEZE

FRAME
DATA*2

SRT

STATUS

DTC

WORK

SUP-

PORT

WORK ITEM

CONDITION

USAGE

FUEL PRESSURE RELEASE

●

FUEL PUMP WILL STOP BY TOUCHING “START” DUR-
ING IDLING.
CRANK A FEW TIMES AFTER ENGINE STALLS.

When releasing fuel pressure
from fuel line

IDLE AIR VOL LEARN

●

THE IDLE AIR VOLUME THAT KEEPS THE ENGINE
WITHIN THE SPECIFIED RANGE IS MEMORIZED IN
ECM.

When learning the idle air volume

SELF-LEARNING CONT

●

THE COEFFICIENT OF SELF-LEARNING CONTROL
MIXTURE RATIO RETURNS TO THE ORIGINAL COEF-
FICIENT.

When clearing the coefficient of
self-learning control value

EC-126

[VQ35DE]

TROUBLE DIAGNOSIS

*: This function is not necessary in the usual service procedure.

SELF-DIAG RESULTS MODE
Self Diagnostic Item

Regarding items of DTC and 1st trip DTC, refer to

EC-55, "EMISSION-RELATED DIAGNOSTIC INFORMA-

TION ITEMS"

Freeze Frame Data and 1st Trip Freeze Frame Data

EVAP SYSTEM CLOSE

CLOSE THE EVAP CANISTER VENT CONTROL VALVE IN
ORDER TO MAKE EVAP SYSTEM CLOSE UNDER THE
FOLLOWING CONDITIONS.

●

IGN SW ON

●

ENGINE NOT RUNNING

●

AMBIENT TEMPERATURE IS ABOVE 0

C (32

F).

●

NO VACUUM AND NO HIGH PRESSURE IN EVAP SYS-
TEM

●

FUEL TANK TEMP. IS MORE THAN 0

C (32

F).

●

WITHIN 10 MINUTES AFTER STARTING “EVAP SYS-
TEM CLOSE”

●

WHEN TRYING TO EXECUTE “EVAP SYSTEM CLOSE”
UNDER THE CONDITION EXCEPT ABOVE, CONSULT-
II WILL DISCONTINUE IT AND DISPLAY APPROPRI-
ATE INSTRUCTION.

NOTE:
WHEN STARTING ENGINE, CONSULT-II MAY DISPLAY
“BATTERY VOLTAGE IS LOW. CHARGE BATTERY”,
EVEN IN USING CHARGED BATTERY.

When detecting EVAP vapor leak
point of EVAP system

VIN REGISTRATION

●

IN THIS MODE VIN IS REGISTERED IN ECM

When registering VIN in ECM

TARGET IDLE RPM ADJ*

●

IDLE CONDITION

When setting target idle speed

TARGET IGN TIM ADJ*

●

IDLE CONDITION

When adjusting target ignition tim-
ing

WORK ITEM

CONDITION

USAGE

Freeze frame data

item*

Description

DIAG TROUBLE
CODE
[PXXXX]

●

The engine control component part/control system has a trouble code, it is displayed as PXXXX. (Refer to

EC-55, "EMISSION-RELATED DIAGNOSTIC INFORMATION ITEMS"

FUEL SYS-B1

●

“Fuel injection system status” at the moment a malfunction is detected is displayed.

●

One mode in the following is displayed.
Mode2: Open loop due to detected system malfunction
Mode3: Open loop due to driving conditions (power enrichment, deceleration enleanment)
Mode4: Closed loop - using oxygen sensor(s) as feedback for fuel control
Mode5: Open loop - has not yet satisfied condition to go to closed loop

FUEL SYS-B2

CAL/LD VALUE [%]

●

The calculated load value at the moment a malfunction is detected is displayed.

COOLANT TEMP [

or [

●

The engine coolant temperature at the moment a malfunction is detected is displayed.

L-FUEL TRM-B1 [%]

●

“Long-term fuel trim” at the moment a malfunction is detected is displayed.

●

The long-term fuel trim indicates much more gradual feedback compensation to the base fuel schedule
than short-term fuel trim.

L-FUEL TRM-B2 [%]

S-FUEL TRM-B1 [%]

●

“Short-term fuel trim” at the moment a malfunction is detected is displayed.

●

The short-term fuel trim indicates dynamic or instantaneous feedback compensation to the base fuel
schedule.

S-FUEL TRM-B2 [%]

ENGINE SPEED
[rpm]

●

The engine speed at the moment a malfunction is detected is displayed.

TROUBLE DIAGNOSIS

EC-127

[VQ35DE]

*: The items are the same as those of 1st trip freeze frame data.

DATA MONITOR MODE
Monitored Item

: Applicable

VEHICL SPEED
[km/h] or [mph]

●

The vehicle speed at the moment a malfunction is detected is displayed.

ABSOL TH·P/S [%]

●

The throttle valve opening angle at the moment a malfunction is detected is displayed.

B/FUEL SCHDL
[msec]

●

The base fuel schedule at the moment a malfunction is detected is displayed.

INT/A TEMP SE [

or [

●

The intake air temperature at the moment a malfunction is detected is displayed.

Freeze frame data

item*

Description

Monitored item

[Unit]

ECM

INPUT

SIG-

NALS

MAIN

SIG-

NALS

Description

Remarks

ENG SPEED [rpm]

●

Indicates the engine speed computed
from the signal of the crankshaft position
sensor (POS) and camshaft position sen-
sor (PHASE).

●

Accuracy becomes poor if engine speed
drops below the idle rpm.

●

If the signal is interrupted while the
engine is running, an abnormal value may
be indicated.

MAS A/F SE-B1 [V]

●

The signal voltage of the mass air flow
sensor is displayed.

●

When the engine is stopped, a certain
value is indicated.

B/FUEL SCHDL
[msec]

●

“Base fuel schedule” indicates the fuel
injection pulse width programmed into
ECM, prior to any learned on board cor-
rection.

A/F ALPHA-B1 [%]

●

The mean value of the air-fuel ratio feed-
back correction factor per cycle is indi-
cated.

●

When the engine is stopped, a certain
value is indicated.

●

This data also includes the data for the
air-fuel ratio learning control.

A/F ALPHA-B2 [%]

COOLAN TEMP/S
[

C] or [

●

The engine coolant temperature (deter-
mined by the signal voltage of the engine
coolant temperature sensor) is displayed.

●

When the engine coolant temperature
sensor is open or short-circuited, ECM
enters fail-safe mode. The engine coolant
temperature determined by the ECM is
displayed.

A/F SEN1 (B1) [V]

●

The A/F signal computed from the input
signal of the air fuel ratio (A/F) sensor 1 is
displayed.

A/F SEN1 (B2) [V]

HO2S2 (B1) [V]

●

The signal voltage of the heated oxygen
sensor 2 is displayed.

HO2S2 (B2) [V]

HO2S2 MNTR (B1)
[RICH/LEAN]

●

Display of heated oxygen sensor 2 signal:
RICH: means the amount of oxygen after
three way catalyst is relatively small.
LEAN: means the amount of oxygen after
three way catalyst is relatively large.

●

When the engine is stopped, a certain
value is indicated.

HO2S2 MNTR (B2)
[RICH/LEAN]

VHCL SPEED SE
[km/h] or [mph]

●

The vehicle speed computed from the
vehicle speed signal sent from combina-
tion meter is displayed.

BATTERY VOLT
[V]

●

The power supply voltage of ECM is dis-
played.

ACCEL SEN 1 [V]

●

The accelerator pedal position sensor
signal voltage is displayed.

●

ACCEL SENS 2 signal is converted be
ECM internally. Thus, they differs from
ECM terminal voltage signal.

ACCEL SEN 2 [V]

EC-128

[VQ35DE]

TROUBLE DIAGNOSIS

THRTL SEN 1 [V]

●

The throttle position sensor signal voltage
is displayed.

●

THRTL SEN 2 signal is converted by
ECM internally. Thus, they differs from
ECM terminal voltage signal.

THRTL SEN 2 [V]

FUEL T/TMP SE
[

C] or [

●

The fuel temperature (determined by the
signal voltage of the fuel tank tempera-
ture sensor) is displayed.

INT/A TEMP SE
[

C] or [

●

The intake air temperature (determined
by the signal voltage of the intake air tem-
perature sensor) is indicated.

EVAP SYS PRES
[V]

●

The signal voltage of EVAP control sys-
tem pressure sensor is displayed.

FPCM DR VOLT
[V]

●

The voltage between fuel pump and
FPCM is displayed.

FUEL LEVEL SE
[V]

●

The signal voltage of the fuel level sensor
is displayed.

START SIGNAL
[ON/OFF]

●

Indicates start signal status [ON/OFF]
computed by the ECM according to the
signals of engine speed and battery volt-
age.

●

After starting the engine, [OFF] is dis-
played regardless of the starter signal.

CLSD THL POS
[ON/OFF]

●

Indicates idle position [ON/OFF] com-
puted by ECM according to the accelera-
tor pedal position sensor signal.

AIR COND SIG
[ON/OFF]

●

Indicates [ON/OFF] condition of the air
conditioner switch as determined by the
air conditioner signal.

P/N POSI SW
[ON/OFF]

●

Indicates [ON/OFF] condition from the
park/neutral position (PNP) switch signal.

PW/ST SIGNAL
[ON/OFF]

●

[ON/OFF] condition of the power steering
system (determined by the signal voltage
of the power steering pressure sensor
signal) is indicated.

LOAD SIGNAL
[ON/OFF]

●

Indicates [ON/OFF] condition from the
electrical load signal.
ON: Rear window defogger switch is ON
and/or lighting switch is in 2nd position.
OFF: Both rear window defogger switch
and lighting switch are OFF.

IGNITION SW
[ON/OFF]

●

Indicates [ON/OFF] condition from igni-
tion switch signal.

HEATER FAN SW
[ON/OFF]

●

Indicates [ON/OFF] condition from the
heater fan switch signal.

BRAKE SW
[ON/OFF]

●

Indicates [ON/OFF] condition from the
stop lamp switch signal.

INJ PULSE-B1
[msec]

●

Indicates the actual fuel injection pulse
width compensated by ECM according to
the input signals.

●

When the engine is stopped, a certain
computed value is indicated.

INJ PULSE-B2
[msec]

IGN TIMING
[BTDC]

●

Indicates the ignition timing computed by
ECM according to the input signals.

●

When the engine is stopped, a certain
value is indicated.

CAL/LD VALUE [%]

●

“Calculated load value” indicates the
value of the current air flow divided by
peak air flow.

Monitored item

[Unit]

ECM

INPUT

SIG-

NALS

MAIN

SIG-

NALS

Description

Remarks

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