Infiniti QX4 (R50). Manual — part 167
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
91
R
Throttle position sensor
[Engine is running]
I
Warm-up condition
I
Accelerator pedal fully released
0.15 - 0.85V
[Ignition switch “ON”]
I
Accelerator pedal fully depressed
3.5 - 4.7V
92
G/B
Fuel tank temperature
sensor
[Engine is running]
Approximately 0 - 4.8V
Output voltage varies with
fuel tank temperature.
93
W
Knock sensor
[Engine is running]
I
Idle speed
Approximately 2.5V
101
102
103
104
105
107
R/B
L/W
R/W
PU/R
R/Y
R/L
Injector No. 1
Injector No. 5
Injector No. 2
Injector No. 6
Injector No. 3
Injector No. 4
[Engine is running]
I
Idle speed
BATTERY VOLTAGE
(11 - 14V)
106
108
B
B
ECM ground
[Engine is running]
I
Idle speed
Engine ground
110
112
B/W
B/W
Power supply for ECM
[Ignition switch “ON”]
BATTERY VOLTAGE
(11 - 14V)
111
P/B
Sensors’ power supply
[Ignition switch “ON”]
Approximately 5V
114
G/R
Communication line
(LAN)
[Engine is running]
I
Idle speed
Approximately 2V
115
LG/R
Data link connector
[Ignition switch “ON”]
I
CONSULT-II or GST is disconnected.
Approximately 2V
★
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
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-135
Description
NBEC0717
The specification (SP) value indicates the tolerance of the value that is displayed in “DATA MONITOR (SPEC)”
mode of CONSULT-II during normal operation of the Engine Control System. When the value in “DATA MONI-
TOR (SPEC)” mode is within the SP value, the Engine Control System is confirmed OK. When the value in
“DATA MONITOR (SPEC)” mode is NOT within the SP value, the Engine Control System may have one or
more malfunctions.
The SP value is used to detect malfunctions that may affect the Engine Control System, but will not light the
MIL.
The SP value will be displayed for the following three items:
I
B/FUEL SCHDL (The fuel injection pulse width programmed into ECM prior to any learned on board cor-
rection)
I
A/F ALPHA-B1/B2 (The mean value of air-fuel ratio feedback correction factor per cycle)
I
MAS A/F SE-B1 (The signal voltage of the mass air flow sensor)
Testing Condition
NBEC0718
I
Vehicle driven distance: More than 5,000 km (3,100 miles)
I
Barometric pressure: 101.3 kPa (760.0 mmHg, 29.92 inHg)
±
3 kPa (22.5 mmHg, 0.89 inHg)
I
Atmospheric temperature: 20 - 30°C (68 - 86°F)
I
Engine coolant temperature: 75 - 95°C (167 - 203°F)
I
Transmission: Warmed-up*1
I
Electrical load: Not applied*2
I
Engine speed: Idle
*1: For A/T models, after the engine is warmed up to normal operating temperature, drive vehicle until “FLUID
TEMP SE” (A/T fluid temperature sensor signal) indicates less than 0.9V.
*2: Rear window defogger switch, air conditioner switch, lighting switch are “OFF”. Cooling fans are not oper-
ating. Steering wheel is straight ahead.
SEF601Z
Inspection Procedure
NBEC0719
NOTE:
Perform “DATA MONITOR (SPEC)” mode in maximum scale dis-
play.
1.
Perform “Basic Inspection”, EC-101.
2.
Confirm that the testing conditions indicated above are met.
3.
Select “B/FUEL SCHDL”, “A/F ALPHA-B1”, “A/F ALPHA-B2”
and “MAS A/F SE-B1” in “DATA MONITOR (SPEC)” mode with
CONSULT-II.
4.
Make sure that monitor items are within the SP value.
5.
If NG, go to “Diagnostic Procedure”, EC-137.
TROUBLE DIAGNOSIS — SPECIFICATION VALUE
Description
EC-136
Diagnostic Procedure
NBEC0720
SEF613ZB
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — SPECIFICATION VALUE
Diagnostic Procedure
EC-137
SEF768Z
TROUBLE DIAGNOSIS — SPECIFICATION VALUE
Diagnostic Procedure (Cont’d)
EC-138
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