Infiniti QX56 (Z62). Manual — part 523
EC-70
< SYSTEM DESCRIPTION >
[VK56VD]
DIAGNOSIS SYSTEM (ECM)
*: The item is indicated, but not used.
NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.
ACTIVE TEST MODE
Test Item
ECM TEMP 1
°
C or
°
F
• Displays a temperature calculated from a signal of
ECM temperature sensor 1.
ECM TEMP 2
°
C or
°
F
• Displays a temperature calculated from a signal of
ECM temperature sensor 2.
FUEL PUMP DUTY
%
• The control condition of the fuel pump control mod-
ule (FPCM) (determined by ECM according to the
input signals) is indicated.
Monitored item
Unit
Description
Remarks
TEST ITEM
CONDITION
JUDGMENT
CHECK ITEM (REMEDY)
VENT CON-
TROL/V
• Ignition switch: ON (Engine
stopped)
• Turn solenoid valve ON and OFF
with the CONSULT-III and listen
to operating sound.
Solenoid valve makes an operating
sound.
• Harness and connectors
• Solenoid valve
ENG COOLANT
TEMP
• Engine: Return to the original
non-standard condition
• Change the engine coolant tem-
perature using CONSULT-III.
If malfunctioning symptom disap-
pears, see CHECK ITEM.
• Harness and connectors
• Engine coolant temperature sen-
sor
• Fuel injector
FUEL INJEC-
TION
• Engine: Return to the original
non-standard condition
• Change the amount of fuel injec-
tion using CONSULT-III.
If malfunctioning symptom disap-
pears, see CHECK ITEM.
• Harness and connectors
• Fuel injector
• Air fuel ratio (A/F) sensor 1
FUEL/T TEMP
SEN
• Change the fuel tank temperature using CONSULT-III.
PURG VOL
CONT/V
• Engine: After warming up, run en-
gine at 1,500 rpm.
• Change the EVAP canister purge
volume control solenoid valve
opening percent using CON-
SULT-III.
Engine speed changes according to
the opening percent.
• Harness and connectors
• Solenoid valve
FAN DUTY CON-
TROL*
• Ignition switch: ON
• Change duty ratio using CON-
SULT-III.
Cooling fan speed changes.
• Harness and connectors
• Cooling fan motor
• Cooling fan relay
• Cooling fan control module
• IPDM E/R
ALTERNATOR
DUTY
• Engine: Idle
• Change duty ratio using CON-
SULT-III.
Battery voltage changes.
• Harness and connectors
• IPDM E/R
• Alternator
POWER BAL-
ANCE
• Engine: After warming up, idle the
engine.
• A/C switch OFF
• Selector lever: P or N
• Cut off each injector signal one at
a time using CONSULT-III.
Engine runs rough or stops.
• Harness and connectors
• Compression
• Fuel injector
• Power transistor
• Spark plug
• Ignition coil
IGNITION TIM-
ING
• Engine: Return to the original
non-standard condition
• Timing light: Set
• Retard the ignition timing using
CONSULT-III.
If malfunctioning symptom disap-
pears, see CHECK ITEM.
• Perform Idle Air Volume Learning.
DIAGNOSIS SYSTEM (ECM)
EC-71
< SYSTEM DESCRIPTION >
[VK56VD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
*: Leaving cooling fan OFF with CONSULT-III while engine is running may cause the engine to overheat.
DTC & SRT CONFIRMATION MODE
SRT STATUS Mode
For items whose SRT codes are set, “CMPLT” is displayed on the CONSULT-III screen; for items whose SRT
codes are not set, “INCMP” is displayed.
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
*: DTC P1456 does not apply but appears in DTC Work Support Mode screens.
V/T ASSIGN AN-
GLE
• Engine: Return to the original
non-standard condition
• Change intake valve timing using
CONSULT-III.
If malfunctioning symptom disap-
pears, see CHECK ITEM.
• Harness and connectors
• Intake valve timing control sole-
noid valve
FPCM
• Engine: Return to the original
trouble condition
• Select “LOW”, “MID” and “HI” with
CONSULT-III.
Fuel pump speed changes or stops.
• Harness and connectors
• Fuel pump control module (FPCM)
TEST ITEM
CONDITION
JUDGMENT
CHECK ITEM (REMEDY)
Test mode
Test item
Corresponding DTC No.
Reference page
HO2S2
HO2S2 (B1) P1146
P0138
HO2S2 (B1) P1147
P0137
HO2S2 (B1) P0139
P0139
HO2S2 (B2) P1166
P0158
HO2S2 (B2) P1167
P0157
HO2S2 (B2) P0159
P0159
A/F SEN1
A/F SEN1 (B1) P1278/P1279
P0133
A/F SEN1 (B1) P1276
P0130
A/F SEN1 (B2) P1288/P1289
P0153
A/F SEN1 (B2) P1286
P0150
EVAPORATIVE SYSTEM
EVP V/S LEAK P0456/P1456*
P0456
PURG VOL CN/V P1444
P0443
PURG FLOW P0441
P0441
EC-72
< ECU DIAGNOSIS INFORMATION >
[VK56VD]
ECM
ECU DIAGNOSIS INFORMATION
ECM
Reference Value
INFOID:0000000006217730
VALUES ON THE DIAGNOSIS TOOL
NOTE:
• Specification data are reference values.
• Specification data are output/input values which are detected or supplied by the ECM at the connector.
* Specification data may not be directly related to their components signals/values/operations.
i.e. Adjust ignition timing with a timing light before monitoring IGN TIMING, because the monitor may show
the specification data in spite of the ignition timing not being adjusted to the specification data. This IGN TIM-
ING monitors the data calculated by the ECM according to the signals input from the camshaft position sen-
sor and other ignition timing related sensors.
CONSULT-III MONITOR ITEM
Monitor Item
Condition
Values/Status
ENG SPEED
• Run engine and compare CONSULT-III value with the tachometer indication.
Almost the same speed as
the tachometer indication
MAS A/F SE-B1
B/FUEL SCHDL
A/F ALPHA-B1
A/F ALPHA-B2
COOLAN TEMP/S
• Ignition switch: ON
Indicates engine coolant
temperature
A/F SEN1 (B1)
• Engine: After warming up
Maintaining engine speed at 2,000 rpm
Fluctuates around 1.5 V
A/F SEN1 (B2)
• Engine: After warming up
Maintaining engine speed at 2,000 rpm
Fluctuates around 1.5 V
HO2S2 (B1)
• Revving engine from idle up to 3,000 rpm quickly after the following condi-
tions are met.
- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and
at idle for 1 minute under no load
0 - 0.3 V
⇔
Approx. 0.6 - 1.0
V
HO2S2 (B2)
• Revving engine from idle up to 3,000 rpm quickly after the following condi-
tions are met.
- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and
at idle for 1 minute under no load
0 - 0.3 V
⇔
Approx. 0.6 - 1.0
V
HO2S2 MNTR (B1)
• Revving engine from idle up to 3,000 rpm quickly after the following condi-
tions are met.
- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and
at idle for 1 minute under no load
LEAN
⇔
RICH
HO2S2 MNTR (B2)
• Revving engine from idle up to 3,000 rpm quickly after the following condi-
tions are met.
- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and
at idle for 1 minute under no load
LEAN
⇔
RICH
VHCL SPEED SE
• Turn drive wheels and compare CONSULT-III value with the speedometer in-
dication.
Almost the same speed as
speedometer indication
BATTERY VOLT
• Ignition switch: ON (Engine stopped)
11 - 14 V
ACCEL SEN 1
• Ignition switch: ON
(Engine stopped)
Accelerator pedal: Fully released
0.65 - 0.87 V
Accelerator pedal: Fully depressed
4.3 - 4.8 V
ACCEL SEN 2*
1
• Ignition switch: ON
(Engine stopped)
Accelerator pedal: Fully released
0.56 - 0.96 V
Accelerator pedal: Fully depressed
4.0 - 4.8 V
ECM
EC-73
< ECU DIAGNOSIS INFORMATION >
[VK56VD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
TP SEN 1-B1
• Ignition switch: ON
(Engine stopped)
• Selector lever: D position
Accelerator pedal: Fully released
More than 0.36 V
Accelerator pedal: Fully depressed
Less than 4.75 V
TP SEN 2-B1*
1
• Ignition switch: ON
(Engine stopped)
• Selector lever: D position
Accelerator pedal: Fully released
More than 0.36 V
Accelerator pedal: Fully depressed
Less than 4.75 V
FUEL T/TMP SE
• Ignition switch: ON
Indicates fuel tank tempera-
ture
EVAP SYS PRES
• Ignition switch: ON
Approx. 1.8 - 4.8 V
FUEL LEVEL SE
• Ignition switch: ON
Depending on fuel level of
fuel tank
START SIGNAL
• Ignition switch: ON
→
START
→
ON
OFF
→
ON
→
OFF
CLSD THL POS
• Ignition switch: ON
(Engine stopped)
Accelerator pedal: Fully released
ON
Accelerator pedal: Slightly depressed
OFF
AIR COND SIG
• Engine: After warming up, idle
the engine
Air conditioner switch: OFF
OFF
Air conditioner switch: ON
(Compressor operates.)
ON
PW/ST SIGNAL
• Engine: After warming up, idle
the engine
Steering wheel: Not being turned
OFF
Steering wheel: Being turned
ON
LOAD SIGNAL
• Ignition switch: ON
Rear window defogger switch: ON
and/or
Lighting switch: 2nd position
ON
Rear window defogger switch and lighting
switch: OFF
OFF
IGNITION SW
• Ignition switch: ON
→
OFF
→
ON
ON
→
OFF
→
ON
HEATER FAN SW
• Engine: After warming up, idle
the engine
Heater fan switch: ON
ON
Heater fan switch: OFF
OFF
BRAKE SW
• Ignition switch: ON
Brake pedal: Fully released
OFF
Brake pedal: Slightly depressed
ON
IGN TIMING
• Engine: After warming up
• Selector lever: P or N position
• A/C switch: OFF
• No load
Idle
1 - 4
°
BTDC
2,000 rpm
25 - 45
°
BTDC
COMBUSTION
—
These items are displayed
but are not applicable to this
model.
CAL/LD VALUE
• Engine: After warming up
• Selector lever: P or N position
• A/C switch: OFF
• No load
Idle
5 - 35%
2,500 rpm
5 - 35%
MASS AIRFLOW
• Engine: After warming up
• Selector lever: P or N position
• A/C switch: OFF
• No load
Idle
2.0 - 6.0 g/s
2,500 rpm
7.0 - 20.0 g/s
PURG VOL C/V
• Engine: After warming up
• Selector lever: P or N position
• A/C switch: OFF
• No load
Idle
(Accelerator pedal: Not depressed even
slightly, after engine starting.)
0%
2,000 rpm
5%
INT/V SOL (B1)
• Engine: After warming up
• Selector lever: P or N position
• A/C switch: OFF
• No load
Idle
0 - 2%
2,000 rpm
Approx. 0 - 50%
Monitor Item
Condition
Values/Status
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