Infiniti QX4 (R50). Manual — part 165
SEF955Y
ECM Terminals and Reference Value
NBEC0044
PREPARATION
NBEC0044S01
1.
ECM is located behind the instrument lower cover. For this
inspection, remove instrument lower cover.
2.
Remove ECM harness protector.
MEC486B
3.
Perform all voltage measurements with the connector con-
nected. Extend tester probe as shown to perform tests easily.
I
Open harness securing clip to make testing easier.
I
Use extreme care not to touch 2 pins at one time.
I
Data is for comparison and may not be exact.
ECM HARNESS CONNECTOR TERMINAL LAYOUT
NBEC0044S02
SEF970W
ECM INSPECTION TABLE
NBEC0044S03
Specification data are reference values and are measured between
each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring the input/
output voltage. Doing so may result in damage to the ECM’s
transistor. Use ground other than the ECM terminals, such as
the ground.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ECM Terminals and Reference Value
EC-127
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
1
L/Y
EVAP canister purge
volume control sole-
noid valve
[Engine is running]
I
Idle speed
BATTERY VOLTAGE
(11 - 14V)
SEF994U
[Engine is running]
I
Engine speed is about 2,000 rpm (More than 100
seconds after starting engine).
BATTERY VOLTAGE
(11 - 14V)
SEF995U
2
R/G
Heated oxygen sensor
1 (front) (bank 2)
heater
[Engine is running]
I
Engine speed is below 3,600 rpm.
0 - 1.0V
[Engine is running]
I
Engine speed is above 3,600 rpm.
BATTERY VOLTAGE
(11 - 14V)
3
L/OR
Heated oxygen sensor
1 (front) (bank 1)
heater
[Engine is running]
I
Engine speed is below 3,600 rpm.
0 - 1.0V
[Engine is running]
I
Engine speed is above 3,600 rpm.
BATTERY VOLTAGE
(11 - 14V)
4
R/W
Heated oxygen sensor
2 (rear) (bank 2)
heater
[Engine is running]
I
Engine speed is below 3,200 rpm.
I
After driving for 2 minutes at a speed of 70 km/h
(43 MPH) or more.
0 - 1.0V
[Ignition switch “ON”]
I
Engine stopped
[Engine is running]
I
Engine speed is above 3,200 rpm.
BATTERY VOLTAGE
(11 - 14V)
5
P/B
Heated oxygen sensor
2 (rear) (bank 1)
heater
[Engine is running]
I
Engine speed is below 3,200 rpm.
I
After driving for 2 minutes at a speed of 70 km/h
(43 MPH) or more.
0 - 1.0V
[Ignition switch “ON”]
I
Engine stopped
[Engine is running]
I
Engine speed is above 3,200 rpm.
BATTERY VOLTAGE
(11 - 14V)
6
7
8
17
PU/G
GY
Y
GY/L
IACV-AAC valve
[Engine is running]
I
Idle speed
0.1 - 14V
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ECM Terminals and Reference Value (Cont’d)
EC-128
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
13
OR/B
Intake valve timing
control solenoid valves
(RH)
[Engine is running]
I
Warm-up condition
I
Idle speed
Battery voltage
[Engine is running]
I
Warm-up condition
I
Engine speed is 2,000 rpm.
7 - 8V
SEF350Z
15
P/L
Intake valve timing
control solenoid valves
(LH)
[Engine is running]
I
Warm-up condition
I
Idle speed
Battery voltage
[Engine is running]
I
Warm-up condition
I
Engine speed is 2,000 rpm.
7 - 8V
SEF350Z
16
Y/G
VIAS control solenoid
valve
[Engine is running]
I
Idle speed
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
I
Engine speed is above 5,000 rpm.
0 - 1.0V
21
22
23
30
31
32
Y/R
G/R
L/R
GY
PU/W
GY/R
Ignition signal No. 1
Ignition signal No. 2
Ignition signal No. 3
Ignition signal No. 4
Ignition signal No. 5
Ignition signal No. 6
[Engine is running]
I
Warm-up condition
I
Idle speed
0 - 0.2V
★
SEF399T
[Engine is running]
I
Warm-up condition
I
Engine speed is 2,500 rpm.
0.1 - 0.3V
★
SEF645T
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ECM Terminals and Reference Value (Cont’d)
EC-129
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
25
W/G
Tachometer
[Engine is running]
I
Warm-up condition
I
Idle speed
7 - 8V
★
SEF579X
[Engine is running]
I
Warm-up condition
I
Engine speed is 2,500 rpm.
7 - 8V
★
SEF580X
26
L/B
ECM relay
(Self shutt-off)
[Engine is running]
[Ignition switch “OFF”]
I
For a few seconds after turning ignition switch
“OFF”
0 - 1.5V
[Ignition switch “OFF”]
I
A few seconds passed after turning ignition
switch “OFF”
BATTERY VOLTAGE
(11 - 14V)
27
LG
Air conditioner relay
[Engine is running]
I
Both A/C switch and blower switch are “ON”
(Compressor is operating).
0 - 1.0V
[Engine is running]
I
A/C switch is “OFF”.
BATTERY VOLTAGE
(11 - 14V)
28
R/L
Fuel pump relay
[Ignition switch “ON”]
I
For 1 second after turning ignition switch “ON”
[Engine is running]
0 - 1.5V
[Ignition switch “ON”]
I
1 second passed after turning ignition switch
“ON”.
BATTERY VOLTAGE
(11 - 14V)
29
G
Swirl control valve con-
trol solenoid valve
[Engine is running]
I
Idle speed
I
Engine coolant temperature is between 15 to
50°C (59 to 122°F).
0 - 1.0V
[Engine is running]
I
Idle speed
I
Engine coolant temperature is above 55°C
(131°F).
BATTERY VOLTAGE
(11 - 14V)
38
OR
MIL
[Ignition switch “ON”]
0 - 1.0V
[Engine is running]
I
Idle speed
BATTERY VOLTAGE
(11 - 14V)
39
G/W
Vacuum cut valve
bypass valve
[Ignition switch “ON”]
BATTERY VOLTAGE
(11 - 14V)
40
G/Y
EVAP canister vent
control valve
[Ignition switch “ON”]
BATTERY VOLTAGE
(11 - 14V)
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ECM Terminals and Reference Value (Cont’d)
EC-130
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