Nissan Frontier D22. Manual — part 247
TROUBLE DIAGNOSIS
EC-91
[KA24DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
ECM Harness Connector Terminal Layout
UBS00D1J
ECM Terminals and Reference Value
UBS00D1K
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 ECM terminals, such as the ground.
SEF533P
LEC106A
AEC913
MEC486B
EC-92
[KA24DE]
TROUBLE DIAGNOSIS
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
1
PU/W
Ignition signal
[Engine is running]
●
Warm-up condition
●
Idle speed
NOTE:
The pulse cycle changes depending on rpm at
idle.
0 - 0.5V
[Engine is running]
●
Warm-up condition
●
Engine speed is 2,000 rpm
0.2 - 1.0V
2
B
Ignition check
[Engine is running]
●
Idle speed
NOTE:
The pulse cycle changes depending on rpm at
idle.
12 - 14V
[Engine is running]
●
Warm-up condition
●
Engine speed is 2,000 rpm
12 - 13V
3
P/L
Tachometer
[Engine is running]
●
Warm-up condition
●
Idle speed
NOTE:
The pulse cycle changes depending on rpm at
idle.
0 - 1V
[Engine is running]
●
Warm-up condition
●
Engine speed is 2,000 rpm
0.5 - 2V
SEF186T
SEF187T
SEF188T
SEF189T
SEF190T
SEF191T
TROUBLE DIAGNOSIS
EC-93
[KA24DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
4
LG/R
ECM relay
(Self shut-off)
[Engine is running]
[Ignition switch: OFF]
●
For a few seconds after turning ignition switch
OFF
0 - 1V
[Ignition switch: OFF]
●
More than a few seconds after turning ignition
switch OFF
BATTERY VOLTAGE
(11 - 14V)
5
R/Y
EVAP canister purge
volume control sole-
noid valve
[Engine is running]
●
Idle speed
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
●
Engine speed is 2,000 rpm (More than 200 sec-
onds after starting engine)
12 - 13V
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]
●
More than 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*
*: Any mode except “OFF”, ambient air temper-
ature above 10
°C (50°F).
Approximately 0V
[Engine is running]
●
A/C switch: 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
20
L/OR
Start signal
[Ignition switch: ON]
Approximately 0V
[Ignition switch: START]
BATTERY VOLTAGE
(11 - 14V)
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
SEF109V
SEF110V
EC-94
[KA24DE]
TROUBLE DIAGNOSIS
21
G/R
Air conditioner dual-
pressure switch
[Engine is running]
●
Both air conditioner switch and blower switch:
ON (Compressor operates)
Approximately 0V
[Engine is running]
●
Air conditioner switch: OFF
BATTERY VOLTAGE
(11 - 14V)
22
L/B
Park/neutral position
(PNP) switch
[Ignition switch: ON]
●
Shift lever: P or N
Approximately 0V
[Ignition switch: ON]
●
Except above position
Approximately 5V
23
L
Throttle position sen-
sor
[Ignition switch: ON]
●
Warm-up condition
●
Accelerator pedal is fully released
0.2 - 0.8V
[Ignition switch: ON]
●
Engine stopped
●
Accelerator pedal is fully depressed
3.5 - 4.5V
24
W/G
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
28
BR/W
Throttle position
switch (Closed posi-
tion)
[Ignition switch: ON]
●
Warm-up condition
●
Accelerator pedal is fully released
BATTERY VOLTAGE
(11 - 14V)
[Ignition switch: ON]
●
Engine stopped
●
Accelerator pedal is slightly depressed
Approximately 0V
29
G/B
Vehicle speed sensor
[Engine is running]
●
Lift up the vehicle
●
Shift lever: D (A/T), 2nd (M/T)
●
Vehicle speed: 40 km/h (25 MPH)
1 - 4V
32
B/Y ECM
ground
[Engine is running]
●
Idle speed
Engine ground
39
GY/R
Power steering oil
pressure switch
[Engine is running]
●
Steering wheel is fully turned
Approximately 0V
[Engine is running]
●
Steering wheel is not turned
Approximately 5V
42
BR
Sensor power supply
[Ignition switch: ON]
Approximately 5V
43
B/W
Sensor ground
[Engine is running]
●
Idle speed
Approximately 0V
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
SEF111V
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