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Infiniti Q45. Manual - part 371

TROUBLE DIAGNOSIS

EC-123

NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.

DATA MONITOR (SPEC) MODE
Monitored Item

NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.

LO SPEED CUT
[NON/CUT]

●

Indicates the vehicle cruise condition.
NON: Vehicle speed is maintained at the
ASCD set speed.
CUT: Vehicle speed decreased to excessively
low compared with the ASCD set speed, and
ASCD operation is cut off.

AT OD MONITOR
[ON/OFF]

●

Indicates [ON/OFF] condition of A/T O/D
according to the input signal from the TCM.

AT OD CANCEL
[ON/OFF]

●

Indicates [ON/OFF] condition of A/T O/D can-
cel signal sent from the TCM.

CRUISE LAMP
[ON/OFF]

●

Indicates [ON/OFF] condition of CRUISE
lamp determined by the ECM according to the
input signals.

SET LAMP
[ON/OFF]

●

Indicates [ON/OFF] condition of SET lamp
determined by the ECM according to the input
signals.

Voltage
[V]

●

Voltage, frequency, duty cycle or pulse width
measured by the probe.

●

Only “#” is displayed if item is unable to
be measured.

●

Figures with “#”s are temporary ones.
They are the same figures as an actual
piece of data which was just previously
measured.

Frequency
[msec], [Hz] or [%]

DUTY-HI

DUTY-LOW

PLS WIDTH-HI

PLS WIDTH-LOW

Monitored item

[Unit]

ECM

INPUT

SIG-

NALS

MAIN

SIG-

NALS

Description

Remarks

Monitored item [Unit]

ECM

INPUT

SIG-

NALS

MAIN

SIG-

NALS

Description

Remarks

ENG SPEED [rpm]

●

Indicates the engine speed computed
from the signals of the crankshaft posi-
tion sensor (POS) and camshaft position
sensor (PHASE).

MAS A/F SE-B1 [V]

●

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

●

When engine is running specification
range 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.

●

When engine is running specification
range is indicated.

A/F ALPHA-B1 [%]
A/F ALPHA-B2 [%]

●

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

●

When engine is running specification
range is indicated.

●

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

EC-124

TROUBLE DIAGNOSIS

ACTIVE TEST MODE
Test Item

TEST ITEM

CONDITION

JUDGEMENT

CHECK ITEM (REMEDY)

FUEL INJEC-
TION

●

Engine: Return to the original
trouble condition

●

Change the amount of fuel injec-
tion using CONSULT-II.

If trouble symptom disappears, see
CHECK ITEM.

●

Harness and connectors

●

Fuel injector

●

Air fuel ratio (A/F) sensor 1

IGNITION TIM-
ING

●

Engine: Return to the original
trouble condition

●

Timing light: Set

●

Retard the ignition timing using
CONSULT-II.

If trouble symptom disappears, see
CHECK ITEM.

●

Perform Idle Air Volume Learning.

POWER BAL-
ANCE

●

Engine: After warming up, idle
the engine.

●

A/C switch: OFF

●

Selector lever: P or N

●

Cut off each fuel injector signal
one at a time using CONSULT-II.

Engine runs rough or dies.

●

Harness and connectors

●

Compression

●

Fuel injector

●

Power transistor

●

Spark plug

●

Ignition coil

COOLING FAN*

●

Ignition switch: ON

●

Turn the cooling fan “HI”, “MID”,
“LOW” and “OFF” using CON-
SULT-II.

Cooling fan moves and stops.

●

Harness and connectors

●

Cooling fan motor

●

Cooling fan relay

ENG COOLANT
TEMP

●

Engine: Return to the original
trouble condition

●

Change the engine coolant tem-
perature using CONSULT-II.

If trouble symptom disappears, see
CHECK ITEM.

●

Harness and connectors

●

Engine coolant temperature sen-
sor

●

Fuel injector

FUEL PUMP
RELAY

●

Ignition switch: ON
(Engine stopped)

●

Turn the fuel pump relay “ON”
and “OFF” using CONSULT-II
and listen to operating sound.

Fuel pump relay makes the operat-
ing sound.

●

Harness and connectors

●

Fuel pump relay

VIAS SOL VALVE

●

Ignition switch: ON

●

Turn solenoid valve “ON” and
“OFF” with CONSULT-II and lis-
ten for operating sound.

Solenoid valve makes an operating
sound.

●

Harness and connectors

●

Solenoid valve

PURG VOL
CONT/V

●

Engine: After warming up, run
engine at 1,500 rpm.

●

Change the EVAP canister purge
volume control solenoid valve
opening percent using CON-
SULT-II.

Engine speed changes according to
the opening percent.

●

Harness and connectors

●

Solenoid valve

FUEL/T TEMP
SEN

●

Change the fuel tank temperature using CONSULT-II.

VENT CON-
TROL/V

●

Ignition switch: ON
(Engine stopped)

●

Turn solenoid valve “ON” and
“OFF” with the CONSULT-II and
listen to operating sound.

Solenoid valve makes an operating
sound.

●

Harness and connectors

●

Solenoid valve

FPCM

●

Engine: Returns to the original
trouble condition

●

Select “LOW” and “HI” with CON-
SULT-II.

If trouble symptom disappears, see
CHECK ITEM.

●

Harness and connectors

●

FPCM

TROUBLE DIAGNOSIS

EC-125

*1: Leaving cooling fan OFF with CONSULT-II while engine is running may cause the engine to overheat.
*2: Never change cooling fan speed from “LOW” to “HI” or from “HI” to “LOW” directory. Change the speed through “MID” to prevent
cooling fan motor from damage.

DTC & SRT CONFIRMATION MODE
SRT STATUS Mode

For details, refer to

EC-53, "SYSTEM READINESS TEST (SRT) CODE"

SRT WORK SUPPORT Mode

This mode enables a technician to drive a vehicle to set the SRT while monitoring the SRT status.

DTC WORK SUPPORT Mode

REAL TIME DIAGNOSIS IN DATA MONITOR MODE (RECORDING VEHICLE DATA)
Description

CONSULT-II has two kinds of triggers and they can be selected by touching “SETTING” in “DATA MONITOR”
mode.

VC/V BYPASS/V

●

Ignition switch: ON
(Engine stopped)

●

Turn solenoid valve “ON” and
“OFF” with the CONSULT-II and
listen to operating sound.

Solenoid valve makes an operating
sound.

●

Harness and connectors

●

Solenoid valve

V/T ASSIGN
ANGLE

●

Engine: Return to the original
trouble condition

●

Change intake valve timing using
CONSULT-II.

If trouble symptom disappears, see
CHECK ITEM.

●

Harness and connectors

●

Intake valve timing control sole-
noid valve

TEST ITEM

CONDITION

JUDGEMENT

CHECK ITEM (REMEDY)

Test mode

Test item

Corresponding DTC No.

Reference page

EVAPORATIVE SYSTEM

EVP SML LEAK P0442/P1442

P0442

P0447

P0455

P1442

EVP V/S LEAK P0456/P1456

P0456

EC-459

P1456

EC-554

PURG VOL CN/V P1444

P0443

EC-404

PURG FLOW P0441

P0441

EC-391

VC CUT/V BP/V P1491

P1491

EC-570

A/F SEN1

A/F SEN1 (B1) P1278/P1279

P0133

EC-264

A/F SEN1 (B1) P1276

P0130

EC-236

A/F SEN1 (B2) P1288/P1289

P0153

EC-264

A/F SEN1 (B2) P1286

P0150

EC-236

HO2S2

HO2S2 (B1) P1146

P0138

EC-288

HO2S2 (B1) P1147

P0137

EC-276

HO2S2 (B1) P0139

P0139

EC-304

HO2S2 (B2) P1166

P0158

EC-288

HO2S2 (B2) P1167

P0157

EC-276

HO2S2 (B2) P0159

P0159

EC-304

EC-126

TROUBLE DIAGNOSIS

“AUTO TRIG” (Automatic trigger):

●

The malfunction will be identified on the CONSULT-II screen
in real time.
In other words, DTC/1st trip DTC and malfunction item will be
displayed if the malfunction is detected by ECM.
At the moment a malfunction is detected by ECM, “MONI-
TOR” in “DATA MONITOR” screen is changed to “Recording
Data... xx%” as shown at right, and the data after the malfunc-
tion detection is recorded. Then when the percentage
reached 100%, “REAL-TIME DIAG” screen is displayed. If
“STOP” is touched on the screen during “Recording Data...
xx%”, “REAL-TIME DIAG” screen is also displayed.
The recording time after the malfunction detection and the
recording speed can be changed by “TRIGGER POINT” and
“Recording Speed”. Refer to CONSULT-II Operation Manual.

“MANU TRIG” (Manual trigger):

●

DTC/1st trip DTC and malfunction item will not be displayed
automatically on CONSULT-II screen even though a malfunc-
tion is detected by ECM.
DATA MONITOR can be performed continuously even though
a malfunction is detected.

Operation

“AUTO TRIG”

●

While trying to detect the DTC/1st trip DTC by performing the DTC Confirmation Procedure, be sure to
select to “DATA MONITOR (AUTO TRIG)” mode. You can confirm the malfunction at the moment it is
detected.

●

While narrowing down the possible causes, CONSULT-II should be set in “DATA MONITOR (AUTO
TRIG)” mode, especially in case the incident is intermittent.
When you are inspecting the circuit by gently shaking (or twisting) the suspicious connectors, compo-
nents and harness in the DTC Confirmation Procedure, the moment a malfunction is found the DTC/1st
trip DTC will be displayed. (Refer to “Incident Simulation Tests” in

GI-26, "How to Perform Efficient

Diagnosis for an Electrical Incident"

“MANU TRIG”

●

If the malfunction is displayed as soon as “DATA MONITOR” is selected, reset CONSULT-II to “MANU
TRIG”. By selecting “MANU TRIG” you can monitor and store the data. The data can be utilized for fur-
ther diagnosis, such as a comparison with the value for the normal operating condition.

PBIB1593E

SEF707X

Content .. 369 370 371 372 ..