Infiniti QX4 (R50). Manual — part 156
Monitored item [Unit]
ECM
input
signals
Main
signals
Description
Remarks
A/F ALPHA-B1 [%]
q
I
Indicates the mean value of the air-fuel ratio
feedback correction factor per cycle.
I
When the engine is running, specifi-
cation range is indicated.
I
This data also includes the data for
the air-fuel ratio learning control.
A/F ALPHA-B2 [%]
q
NOTE:
I
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.
I
Regarding R50 model, “B1” indicates bank 1 and “B2” indicates bank 2.
ACTIVE TEST MODE
NBEC0034S07
TEST ITEM
CONDITION
JUDGEMENT
CHECK ITEM (REMEDY)
FUEL INJECTION
I
Engine: Return to the original
trouble condition
I
Change the amount of fuel injec-
tion using CONSULT-II.
If trouble symptom disappears, see
CHECK ITEM.
I
Harness and connector
I
Fuel injectors
I
Heated oxygen sensor
IGNITION TIMING
I
Engine: Return to the original
trouble condition
I
Timing light: Set
I
Retard the ignition timing using
CONSULT-II.
If trouble symptom disappears, see
CHECK ITEM.
I
Adjust initial ignition timing
IACV-AAC/V
OPENING
I
Engine: After warming up, idle
the engine.
I
Change the IACV-AAC valve
opening percent using CON-
SULT-II.
Engine speed changes according
to the opening percent.
I
Harness and connector
I
IACV-AAC valve
POWER BAL-
ANCE
I
Engine: After warming up, idle
the engine.
I
A/C switch “OFF”
I
Shift lever “N”
I
Cut off each injector signal one
at a time using CONSULT-II.
Engine runs rough or dies.
I
Harness and connector
I
Compression
I
Injectors
I
Power transistor
I
Spark plugs
I
Ignition coils
ENG COOLANT
TEMP
I
Engine: Return to the original
trouble condition
I
Change the engine coolant tem-
perature using CONSULT-II.
If trouble symptom disappears, see
CHECK ITEM.
I
Harness and connector
I
Engine coolant temperature sen-
sor
I
Fuel injectors
FUEL PUMP
RELAY
I
Ignition switch: ON
(Engine stopped)
I
Turn the fuel pump relay “ON”
and “OFF” using CONSULT-II
and listen to operating sound.
Fuel pump relay makes the operat-
ing sound.
I
Harness and connector
I
Fuel pump relay
VIAS SOL VALVE
I
Ignition switch: ON
I
Turn solenoid valve “ON” and
“OFF” with CONSULT-II and lis-
ten for operating sound.
Solenoid valve makes an operating
sound.
I
Harness and connector
I
Solenoid valve
SWIRL CONT
SOL VALVE
I
Ignition switch: ON
I
Turn solenoid valve “ON” and
“OFF” with CONSULT-II and lis-
ten for operating sound.
Solenoid valve makes an operating
sound.
I
Harness and connector
I
Solenoid valve
PURG VOL
CONT/V
I
Engine: After warming up, run
engine at 1,500 rpm.
I
Change the EVAP canister purge
volume control solenoid valve
opening percent using CON-
SULT-II.
Engine speed changes according
to the opening percent.
I
Harness and connector
I
Solenoid valve
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont’d)
EC-91
TEST ITEM
CONDITION
JUDGEMENT
CHECK ITEM (REMEDY)
FUEL/T TEMP
SEN
I
Change the fuel tank temperature using CONSULT-II.
VENT
CONTROL/V
I
Ignition switch: ON
(Engine stopped)
I
Turn solenoid valve “ON” and
“OFF” with the CONSULT-II and
listen to operating sound.
Solenoid valve makes an operating
sound.
I
Harness and connector
I
Solenoid valve
VC/V BYPASS/V
I
Ignition switch: ON
(Engine stopped)
I
Turn solenoid valve “ON” and
“OFF” with the CONSULT-II and
listen to operating sound.
Solenoid valve makes an operating
sound.
I
Harness and connector
I
Solenoid valve
TARGET INT/V
TIM
I
Engine: After warming up, hold
engine speed at 1,500 to 2,000
rpm.
I
Change the intake valve timing
using CONSULT-II.
If trouble symptom disappears, see
CHECK ITEM.
I
Harness and connector
I
Intake valve timing control sole-
noid valve
DTC & SRT CONFIRMATION MODE
NBEC0034S08
SRT STATUS Mode
NBEC0034S0801
For details, refer to “SYSTEM READINESS TEST (SRT) CODE”,
EC-61.
SRT Work Support Mode
NBEC0034S0803
This mode enables a technician to drive a vehicle to set the SRT
while monitoring the SRT status.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont’d)
EC-92
DTC Work Support Mode
NBEC0034S0802
Test mode
Test item
Condition
Reference page
EVAPORATIVE SYSTEM
EVAP SML LEAK P0440
Refer to corresponding
trouble diagnosis for
DTC.
EVAP VERY SML LEAK P1441
PURG VOL CN/V P1444
PURGE FLOW P1447
VC CUT/V BP/V P1491
HEATED OXYGEN SEN-
SOR 1 (FRONT)
HO2S1 (B1) P0130
HO2S1 (B1) P0131
HO2S1 (B1) P0132
HO2S1 (B1) P0133
HO2S1 (B2) P0150
HO2S1 (B2) P0151
HO2S1 (B2) P0152
HO2S1 (B2) P0153
HEATED OXYGEN SEN-
SOR 2 (REAR)
HO2S2 (B1) P0137
HO2S2 (B1) P0138
HO2S2 (B1) P0139
HO2S2 (B2) P0157
HO2S2 (B2) P0158
HO2S2 (B2) P0159
SEF705Y
SEF707X
REAL TIME DIAGNOSIS IN DATA MONITOR MODE
(RECORDING VEHICLE DATA)
NBEC0034S10
CONSULT-II has two kinds of triggers and they can be selected by
touching “SETTING” in “DATA MONITOR” mode.
1)
“AUTO TRIG” (Automatic trigger):
I
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, “MONITOR”
in “DATA MONITOR” screen is changed to “Recording Data ...
xx%” as shown at left, and the data after the malfunction detec-
tion 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.
2)
“MANU TRIG” (Manual trigger):
I
DTC/1st trip DTC and malfunction item will not be displayed
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont’d)
EC-93
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.
Use these triggers as follows:
1)
“AUTO TRIG”
I
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 malfunc-
tion at the moment it is detected.
I
While narrowing down the possible causes, CONSULT-II
should be set in “DATA MONITOR (AUTO TRIG)” mode, espe-
cially in case the incident is intermittent.
When you are inspecting the circuit by gently shaking (or twist-
ing) the suspicious connectors, components and harness in
the “DTC Confirmation Procedure”, the moment a malfunction
is found the DTC/1st trip DTC will be displayed. (Refer to
GI-36, “Incident Simulation Tests”.)
2)
“MANU TRIG”
I
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 further diagnosis, such as a comparison with
the value for the normal operating condition.
SEF714Y
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont’d)
EC-94
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