Nissan Terrano r20e. Manual — part 108
ECM Terminals and Reference Value
PREPARATION
1. ECM is located behind the instrument lower panel. For this
inspection, remove the driver’s side 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.
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.
Be sure ECM unit is properly grounded before checking.
MEC020E
AEC913
SEF367I
SEF665S
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ZD30DDTi
EC-69
ECM HARNESS CONNECTOR TERMINAL LAYOUT
ECM INSPECTION TABLE
Remarks: 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 damage the
ECM’s transistor. Use a ground other than ECM terminals, such as the ground.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage and Pulse
Signal)
2
L/G
Intake air control valve
control solenoid valve
Engine is running.
BATTERY VOLTAGE
(11 - 14V)
Ignition switch “OFF”
For a few seconds after turning ignition
switch “OFF”
Approximately 0.1V
4
G
ECM relay (Self-shutoff)
Ignition switch “ON”
Ignition switch “OFF”
For a few seconds after turning ignition
switch “OFF”
Approximately 0.25V
Ignition switch “OFF”
A few seconds passed after turning ignition
switch “OFF”
BATTERY VOLTAGE
(11 - 14V)
SEF064P
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ZD30DDTi
ECM Terminals and Reference Value (Cont’d)
EC-70
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage and Pulse
Signal)
5
L/B
Tachometer
Engine is running.
Warm-up condition
Idle speed
Approximately 5.7V
SEF255Z
Engine is running.
Warm-up condition
Engine speed is 2,000 rpm
Approximately 6V
SEF256Z
14
LG/R
Cooling fan relay
Engine is running.
Cooling fan is not operating
BATTERY VOLTAGE
(11 - 14V)
Engine is running.
Cooling fan is operating
Approximately 0.1V
15
G/PU
Air conditioner relay
Engine is running.
Air conditioner switch is “OFF”
BATTERY VOLTAGE
(11 - 14V)
Engine is running.
Both air conditioner switch and blower fan
switch are “ON”
(Compressor is operating)
Approximately 0.1V
16
G/W
Glow lamp
Ignition switch “ON”
Glow lamp is “ON”
Approximately 1V
Ignition switch “ON”
Glow lamp is “OFF”
BATTERY VOLTAGE
(11 - 14V)
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ZD30DDTi
ECM Terminals and Reference Value (Cont’d)
EC-71
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage and Pulse
Signal)
17
G/Y
Stop lamp switch
Ignition switch “ON”
Brake pedal fully released
Approximately 0V
Ignition switch “ON”
Brake pedal depressed
BATTERY VOLTAGE
(11 - 14V)
18
L
Malfunction indicator
lamp
Ignition switch “ON”
Approximately 1V
Engine is running.
Idle speed
BATTERY VOLTAGE
(11 - 14V)
19
LG/W
Engine coolant tempera-
ture sensor
Engine is running.
Approximately 0 - 4.8V
Output voltage varies with
engine coolant temperature
20
PU
Start signal
Ignition switch “ON”
Approximately 0V
Ignition switch “START”
BATTERY VOLTAGE
(11 - 14V)
21
G/R
Air conditioner switch
Engine is running.
Air conditioner switch is “OFF”
BATTERY VOLTAGE
(11 - 14V)
Engine is running.
Both air conditioner switch and blower fan
switch are “ON”
(Compressor is operating)
Approximately 0.1V
22
BR/Y
(A/T)
G
(M/T)
Park/Neutral position
switch
Ignition switch “ON”
Gear position is “Neutral” (M/T models)
Gear position is “P” or “N” (A/T models)
Approximately 0V
Ignition switch “ON”
Except the above gear position
BATTERY VOLTAGE
(11 - 14V)
23
G
Accelerator position sen-
sor
Ignition switch “ON”
Accelerator pedal fully released
0.4 - 0.6V
Ignition switch “ON”
Accelerator pedal fully depressed
Approximately 4.5V
24
G/Y
A/T signal No. 1
Engine is running.
Warm-up condition
Idle speed
Voltage goes high up once in
a few seconds
SEF448Z
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ZD30DDTi
ECM Terminals and Reference Value (Cont’d)
EC-72
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