Infiniti QX56 (JA60). Manual — part 443
![](/vehicles/zatt/vend/genn/kongex.png)
EC-424
< ECU DIAGNOSIS >
[VK56DE]
ECM
*1: 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.
*2: Before measuring the terminal voltage, confirm the battery is fully charged. Refer to
I/P PULLY SPD
• Vehicle speed: More than 20 km/h (12 MPH)
Almost the same speed as the
tachometer indication
VEHICLE SPEED
• Turn drive wheels and compare CONSULT-IIl value with the speedometer
indication.
Almost the same speed as the
speedometer indication
TRVL AFTER MIL
• Ignition switch: ON
Vehicle has traveled after MIL has
turned ON.
0 - 65,535 km
(0 - 40,723 mile)
A/F S1 HTR (B1)
A/F S1 HTR (B2)
• Engine: After warming up, idle the engine
4 - 100%
AC PRESS SEN
• Engine: Idle
• Both A/C switch and blower fan switch: ON (Compressor operates.)
1.0 - 4.0V
VHCL SPEED SE
• Turn drive wheels and compare CONSULT-IIl value with the speedometer
indication.
Almost the same speed as the
speedometer indication
SET VHCL SPD
• Engine: Running
ASCD: Operating.
The preset vehicle speed is dis-
played.
MAIN SW
• Ignition switch: ON
MAIN switch: Pressed
ON
MAIN switch: Released
OFF
CANCEL SW
• Ignition switch: ON
CANCEL switch: Pressed
ON
CANCEL switch: Released
OFF
RESUME/ACC SW
• Ignition switch: ON
RESUME/ACCELERATE switch:
Pressed
ON
RESUME/ACCELERATE switch: Re-
leased
OFF
SET SW
• Ignition switch: ON
SET/COAST switch: Pressed
ON
SET/COAST switch: Released
OFF
DIST SW
• Ignition switch: ON
DISTANCE switch: Pressed
ON
DISTANCE switch: Released
OFF
BRAKE SW1
• Ignition switch: ON
Brake pedal: Fully released
ON
Brake pedal: Slightly depressed
OFF
BRAKE SW2
• Ignition switch: ON
Brake pedal: Fully released
OFF
Brake pedal: Slightly depressed
ON
CRUISE LAMP
• Ignition switch: ON
MAIN switch: Pressed at the 1st time
→ at the 2nd time
ON
→ OFF
SET LAMP
• MAIN switch: ON
• Vehicle speed: Between 40 km/h
(25 MPH) and 144 km/h (89
MPH)
ASCD: Operating
ON
ASCD: Not operating
OFF
ALT DUTY
• Engine: Idle
0 - 80%
BAT CUR SEN
• Engine speed: Idle
• Battery: Fully charged*
2
• Selector lever: P or N
• Air conditioner switch: OFF
• No load
Approx. 2,600 - 3,500mV
ALT DUTY SIG
• Power generation voltage variable control: Operating
ON
• Power generation voltage variable control: Not operating
OFF
MONITOR ITEM
CONDITION
SPECIFICATION
![](/vehicles/zatt/vend/genn/kitantlow.png)
ECM
EC-425
< ECU DIAGNOSIS >
[VK56DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
ECM Harness Connector Terminal Layout
INFOID:0000000005149493
ECM Terminal and Reference Value
INFOID:0000000005149494
PREPARATION
ECM is located in the engine room passenger side behind battery.
ECM INSPECTION TABLE
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-IIl.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECMs transistor. Use a ground other than ECM terminals, such as the ground.
PBIB3368E
BBIA0386E
TER-
MI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
1
B
ECM ground
[Engine is running]
• Idle speed
Body ground
2
LG/B
A/F sensor 1 heater (bank 1)
[Engine is running]
• Warm-up condition
• Idle speed
(More than 140 seconds after starting en-
gine)
Approximately 2.9 - 8.8V
3
L
Throttle control motor relay
power supply
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
4
L/W
Throttle control motor (Close)
[Ignition switch: ON]
• Engine: Stopped
• Selector lever: D
• Accelerator pedal: Fully released
0 - 14V
PBIA8148J
PBIB1104E
![](/vehicles/zatt/vend/genn/ybeselwheve.png)
EC-426
< ECU DIAGNOSIS >
[VK56DE]
ECM
5
L/B
Throttle control motor (Open)
[Ignition switch: ON]
• Engine: Stopped
• Selector lever: D
• Accelerator pedal: Fully depressed
0 - 14V
6
GR
Heated oxygen sensor 2 heat-
er (bank 1)
[Engine is running]
• Engine speed: 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
0 - 1.0V
[Ignition switch: ON]
• Engine: Stopped
[Engine is running]
• Engine speed: Above 3,600 rpm
BATTERY VOLTAGE
(11 - 14V)
10
W
Intake valve timing control so-
lenoid valve (bank 1)
[Engine is running]
• Warm-up condition
• Idle speed
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
• Warm-up condition
• Engine speed: 2,000rpm
7 - 12V
11
LG
Intake valve timing control so-
lenoid valve (bank 2)
[Engine is running]
• Warm-up condition
• Idle speed
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
• Warm-up condition
• Engine speed: 2,000rpm
7 - 12V
12
R
Power steering pressure sen-
sor
[Engine is running]
• Steering wheel: Being turned
0.5 - 4.5V
[Engine is running]
• Steering wheel: Not being turned
0.4 - 0.8V
TER-
MI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
PBIB1105E
PBIB1790E
PBIB1790E
![](/vehicles/zatt/vend/genn/ictto.png)
ECM
EC-427
< ECU DIAGNOSIS >
[VK56DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
13
O
Crankshaft position sensor
(POS)
[Engine is running]
• Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes depending on rpm at
idle
Approximately 10V
[Engine is running]
• Engine speed: 2,000 rpm
Approximately 10V
14
Y
Camshaft position sensor
(PHASE)
[Engine is running]
• Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes depending on rpm at
idle
1.0 - 4.0V
[Engine is running]
• Engine speed: 2,000 rpm
1.0 - 4.0V
15
W
Knock sensor (bank 1)
[Engine is running]
• Idle speed
Approximately 2.5V
16
G
A/F sensor 1 (bank 1)
[Engine is running]
• Warm-up condition
• Engine speed: 2,000 rpm
Approximately 1.8V
Output voltage varies with air fuel
ratio.
TER-
MI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
PBIB1041E
PBIB1042E
PBIB1039E
PBIB1040E
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