Nissan Silvia. Instruction — part 140
SEC357C
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Major Sensor Reference Graph in Data Monitor Mode (Cont’d)
EC-75
SEC358C
ECM Terminals and Reference Value
NMEC0044
PREPARATION
NMEC0044S01
1.
ECM is located behind the dash side lower finisher LH. For this
inspection, remove dash side lower cover.
MEF505D
2.
Remove ECM harness protector.
MEC486B
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.
ECM HARNESS CONNECTOR TERMINAL LAYOUT
NMEC0044S02
SEF877K
ECM INSPECTION TABLE
NMEC0044S03
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 damage to the ECM’s
transistor. Use a ground other than ECM terminals, such as
the ground.
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ECM Terminals and Reference Value
EC-76
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
1
3
5
25
R/W
BR/R
R/G
R/L
Ignition signal No. 1
Ignition signal No. 2
Ignition signal No. 3
Ignition signal No. 4
[Engine is running]
I
Warm-up condition
I
Idle speed
0 - 0.2V
★
SEC359C
[Engine is running]
I
Warm-up condition
I
Engine speed is 2,000 rpm.
0.1 - 1.0V
★
SEC360C
2
L/OR
Tachometer
[Engine is running]
I
Warm-up condition
I
Idle speed
Approximately 1.0V
★
SEC361C
[Engine is running]
I
Warm-up condition
I
Engine speed is 2,000 rpm.
Approximately 1.5V
★
SEC362C
4
R/B
ECM relay
(Self shut-off)
[Engine is running]
[Ignition switch “OFF”]
I
For a few seconds after turning ignition switch
“OFF”
0 - 1.5V
[Ignition switch “OFF”]
I
A few seconds passed after turning ignition
switch “OFF”
BATTERY VOLTAGE
(11 - 14V)
6
13
B
B
ECM ground
[Engine is running]
I
Idle speed
Engine ground
7
BR/Y
Data link connector
[Ignition switch “ON”]
I
CONSULT-II is connected and turn “ON”.
Approximately 0V
9
P/B
Cooling fan relay (Low)
[Engine is running]
I
Cooling fan is operating.
0 - 1.0V
[Engine is running]
I
Cooling fan is not operating.
BATTERY VOLTAGE
(11 - 14V)
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ECM Terminals and Reference Value (Cont’d)
EC-77
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
10
L/G
Cooling fan relay
(High)
[Engine is running]
I
Cooling fan is operating at high speed.
0 - 1.0V
[Engine is running]
I
Cooling fan is operating.
BATTERY VOLTAGE
(11 - 14V)
11
G
Air conditioner relay
[Engine is running]
I
Both A/C switch and blower fan switch are “ON”
(Compressor is operating).
0 - 1.0V
[Engine is running]
I
A/C switch is “OFF”.
BATTERY VOLTAGE
(11 - 14V)
12
PU/W
A/T signal No. 3
[Engine is running]
I
Idle speed
0 - 0.1V
15
SB
Data link connector
[Ignition switch “ON”]
I
CONSULT-II is connected and turn “ON”.
3 - 9V
16
L
Mass air flow sensor
[Engine is running]
I
Warm-up condition
I
Idle speed
0.8 - 1.5V
[Engine is running]
I
Warm-up condition
I
Engine speed is 3,000 rpm.
1.4 - 2.0V
17
P
Mass air flow sensor
ground
[Engine is running]
I
Warm-up condition
I
Idle speed
Approximately 0V
18
P/B
Engine coolant tem-
perature sensor
[Engine is running]
Approximately 0 - 4.8V
Output voltage varies with
engine coolant temperature.
19
W
Heated oxygen sensor
1 (front)
[Engine is running]
I
Warm-up condition
I
Engine speed is 2,000 rpm.
0 - Approximately 1.0V
(Periodically change)
SEC363C
20
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
21
GY
Sensor’s ground
[Engine is running]
I
Warm-up condition
I
Idle speed
Approximately 0V
23
G/R
Data link connector
[Ignition switch “ON”]
I
CONSULT-II is connected and turn “ON”.
Approximately 0V
24
OR
Malfunction indicator
lamp
[Ignition switch “ON”]
0 - 1.0V
[Engine is running]
I
Idle speed
BATTERY VOLTAGE
(11 - 14V)
27
W
Knock sensor
[Engine is running]
I
Idle speed
Approximately 2.5V
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ECM Terminals and Reference Value (Cont’d)
EC-78
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