Nissan Frontier D22. Manual — part 391
TROUBLE DIAGNOSIS
EC-667
[VG33E]
C
D
E
F
G
H
I
J
K
L
M
A
EC
ECM Harness Connector Terminal Layout
UBS00DF8
ECM Terminals and Reference Value
UBS00DF9
PREPARATION
1.
ECM is located behind the instrument lower cover. For this
inspection:
●
Remove instrument lower cover.
2.
Remove ECM harness protector.
3.
Perform all voltage measurements with the connector con-
nected. Extend tester probe as shown to perform tests easily.
●
Open harness securing clip to make testing easier.
●
Use extreme care not to touch 2 pins at 1 time.
●
Data is for comparison and may not be exact.
ECM INSPECTION TABLE
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than the ECM terminals, such as the ground.
SEF533P
LEC106A
AEC913
MEC486B
EC-668
[VG33E]
TROUBLE DIAGNOSIS
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
1
PU/W
Ignition signal
[Engine is running]
●
Idle speed
NOTE:
The pulse cycle changes depending on rpm at
idle
Approximately 0.7V
[Engine is running]
●
Engine speed is 2,000 rpm
1.1 - 1.5V
3
P/L
Tachometer
[Engine is running]
●
Warm-up condition
●
Idle speed
NOTE:
The pulse cycle changes depending on rpm at
idle
1 - 2V
[Engine is running]
●
Engine speed is 2,000 rpm
3 - 5V
4
OR/B
ECM relay
(Self shutoff)
[Engine is running]
[Ignition switch: OFF]
●
For a few seconds after turning ignition switch
OFF
0 - 1.5V
[Ignition switch: OFF]
●
A few seconds passed after turning ignition
switch OFF
BATTERY VOLTAGE
(11 - 14V)
SEF988U
SEF989U
SEF992U
SEF993U
TROUBLE DIAGNOSIS
EC-669
[VG33E]
C
D
E
F
G
H
I
J
K
L
M
A
EC
5
R/Y
EVAP canister purge
volume control solenoid
valve
[Engine is running]
●
Idle speed
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
●
Engine speed is 2,000 rpm (More than 100
seconds after starting engine)
BATTERY VOLTAGE
(11 - 14V)
7
Y/G
A/T check signal
[Ignition switch: ON]
[Engine is running]
0 - 3.0V
9
B/Y
Ambient air tempera-
ture switch
[Engine is running]
●
Idle speed
●
Ambient air temperature is above 25
°C (77°F)
●
Air conditioner is operating
0V
[Engine is running]
●
Idle speed
●
Ambient air temperature is below 19
°C (66°F)
●
Air conditioner is operating
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
●
Idle speed
●
Ambient air temperature is below 19
°C (66°F)
●
Air conditioner is not operating
Approximately 5V
10 B/R
ECM
ground
[Engine is running]
●
Idle speed
Engine ground
11
W/R
Fuel pump relay
[Ignition switch: ON]
●
For a few seconds after turning ignition switch
ON
[Engine is running]
0 - 1V
[Ignition switch: ON]
●
A few seconds after turning ignition switch ON
BATTERY VOLTAGE
(11 - 14V)
12
P
Air conditioner relay
[Engine is running]
●
Both A/C switch and blower switch are ON*
0 - 1V
[Engine is running]
●
A/C switch is OFF
BATTERY VOLTAGE
(11 - 14V)
18
R/W
Malfunction indicator
lamp
[Ignition switch: ON]
0 - 1V
[Engine is running]
●
Idle speed
BATTERY VOLTAGE
(11 - 14V)
19
B/R
ECM ground
[Engine is running]
●
Idle speed
Engine ground
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
SEF994U
SEF995U
EC-670
[VG33E]
TROUBLE DIAGNOSIS
20
L/OR
Start signal
[Ignition switch: ON]
Approximately 0V
[Ignition switch: START]
9 - 12V
21
G/R
Air conditioner switch
[Engine is running]
●
Both A/C switch and blower switch are ON
(Compressor operates)*
Approximately 0V
[Engine is running]
●
A/C switch is OFF
BATTERY VOLTAGE
(11 - 14V)
22
L/B
Park/neutral position
(PNP) switch
[Ignition switch: ON]
●
Shift lever: P or N (A/T), Neutral (M/T)
Approximately 0V
[Ignition switch: ON]
●
Except above position
Approximately 5V
23
L
Throttle position sensor
[Engine is running]
●
Warm-up condition
●
More than -40.0 kpa (-300 mmHg, -11.81 inHg)
of vacuum is applied to the throttle opener with
a hand vacuum pump
●
Accelerator pedal is fully released
0.15 - 0.85V
[Ignition switch: ON]
●
Engine stopped
●
Accelerator pedal is fully depressed
3.5 - 4.7V
24
W/L
Ignition switch
[Ignition switch: OFF]
0V
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
25
B/Y
ECM ground
[Engine is running]
●
Idle speed
Engine ground
26
PU/W
A/T signal No. 1
[Engine is running]
●
Idle speed
Approximately 0 - 1.0V
27
P/B
A/T signal No. 2
[Engine is running]
●
Idle speed
Approximately 0 - 1.0V
28
BR/W
Throttle position switch
(Closed position)
[Engine is running]
●
Warm-up condition
●
More than -40.0 kpa (-300 mmHg, -11.81 inHg)
of vacuum is applied to the throttle opener with
a hand vacuum pump
●
Accelerator pedal is fully released
BATTERY VOLTAGE
(11 - 14V)
[Ignition switch: ON]
●
Engine stopped
●
Accelerator pedal is depressed
Approximately 0V
29
G/B
Vehicle speed sensor
[Engine is running]
●
Lift up the vehicle.
●
Shift lever: 2nd (M/T), D (A/T)
●
Vehicle speed is 40 km/h (25 MPH)
2 - 3V
32
B/Y
ECM ground
[Engine is running]
●
Idle speed
Engine ground
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
SEF996U
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