Infiniti G20 (P11). Manual — part 182
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
65
W
Crankshaft position
sensor (OBD)
[Engine is running]
I
Warm-up condition
I
Idle speed
3 - 5V (AC range)
SEF721W
[Engine is running]
I
Engine speed is 2,000 rpm
6 - 9V (AC range)
SEF722W
67
W/L
Power supply for ECM
(Back-up)
[Ignition switch “OFF”]
BATTERY VOLTAGE
(11 - 14V)
70
BR/Y
Engine coolant tem-
perature sensor
[Engine is running]
Approximately 0 - 4.8V
Output voltage varies with
engine coolant temperature.
71
GY
Throttle position sensor
signal output
[Engine is running]
I
Warm-up condition
I
Accelerator pedal fully released
Approximately 0.4V
[Ignition switch “ON”]
I
Accelerator pedal fully depressed
Approximately 4V
72
R/B
EGR temperature sen-
sor
[Engine is running]
I
Warm-up condition
I
Idle speed
Less than 4.5V
[Engine is running]
I
Warm-up condition
I
EGR system is operating
0 - 1.5V
73
G
Mass air flow sensor
ground
[Engine is running]
I
Warm-up condition
I
Idle speed
Approximately 0V
74
R/L
Refrigerant pressure
sensor
[Engine is running]
I
Warm-up condition
I
Both A/C switch and blower switch are “ON”
(Compressor operates)
0.36 - 3.88V
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ECM Terminals and Reference Value (Cont’d)
EC-139
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
75
L
Camshaft position sen-
sor (Reference signal)
[Engine is running]
I
Warm-up condition
I
Idle speed
0.1 - 0.4V
SEF006W
[Engine is running]
I
Engine speed is 2,000 rpm
0.1 - 0.4V
SEF007W
81
W
Knock sensor
[Engine is running]
I
Idle speed
Approximately 2.5V
82
LG/R
Fuel tank temperature
sensor
[Engine is running]
Approximately 0 - 4.8V
Output voltage varies with
fuel tank temperature.
83
G/R
Fuel level sensor
[Ignition switch “ON”]
Approximately 0 - 4.8V
Output voltage varies with
fuel level.
84
W
EVAP control system
pressure sensor
[Ignition switch “ON”]
Approximately 3.4V
85
B/W
Camshaft position sen-
sor (Position signal)
[Engine is running]
I
Warm-up condition
I
Idle speed
Approximately 2.6V
SEF004W
[Engine is running]
I
Engine speed is 2,000 rpm
Approximately 2.5V
SEF005W
86
Y/G
Vehicle speed sensor
[Engine is running]
I
Lift up the vehicle
I
In 2nd gear position
I
Vehicle speed is 40 km/h (25 MPH)
0 - Approximately 4.2V
SEF003W
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ECM Terminals and Reference Value (Cont’d)
EC-140
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
90
B
Fuel level sensor
ground
[Engine is running]
I
Idle speed
Approximately 0V
91
PU
A/T check signal
[Ignition switch “ON”]
0 - Approximately 5V
92
Y
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
101
103
105
107
R/B
Y/B
G/B
L/B
Injector No. 1
Injector No. 2
Injector No. 3
Injector No. 4
[Engine is running]
I
Warm-up condition
I
Idle speed
BATTERY VOLTAGE
(11 - 14V)
SEF011W
[Engine is running]
I
Warm-up condition
I
Engine speed is 2,000 rpm
BATTERY VOLTAGE
(11 - 14V)
SEF012W
102
PU/W
EVAP canister vent
control valve
[Ignition switch “ON”]
BATTERY VOLTAGE
(11 - 14V)
106
108
B
B
ECM ground
[Engine is running]
I
Idle speed
Engine ground
110
112
W
W
Power supply for ECM
[Ignition switch “ON”]
BATTERY VOLTAGE
(11 - 14V)
111
P/L
Sensor’s power supply
[Ignition switch “ON”]
Approximately 5V
115
L/B
DATA link connector
[Ignition switch “ON”]
I
CONSULT-II or GST is disconnected.
Approximately 8V
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ECM Terminals and Reference Value (Cont’d)
EC-141
Description
NCEC0666
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
NCEC0667
I
Vehicle driven distance: More than 5,000 km (3,107 miles)
I
Barometric pressure: 98.3 - 104.3 kPa (1.003 - 1.064 kg/cm
2
, 14.25 - 15.12 psi)
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. For M/T models, drive vehicle for 5
minutes after the engine is warmed up to normal operating temperature.
*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
NCEC0668
NOTE:
Perform “DATA MONITOR (SPEC)” mode in maximum scale dis-
play.
1.
Perform “Basic Inspection”, EC-107.
2.
Confirm that the testing conditions indicated above are met.
3.
Select “B/FUEL SCHDL”, “A/F ALPHA-B1” 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-143.
TROUBLE DIAGNOSIS — SPECIFICATION VALUE
Description
EC-142
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