Nissan Silvia. Manual — part 148
Wiring Diagram
NMEC0685
TEC801
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC 0103 ENGINE COOLANT TEMPERATURE SENSOR (ECTS) (CIRCUIT)
Wiring Diagram
EC-107
Diagnostic Procedure
NMEC0686
1
CHECK POWER SUPPLY
1. Turn ignition switch “OFF”.
2. Disconnect engine coolant temperature sensor harness connector.
SEC379C
3. Turn ignition switch “ON”.
4. Check voltage between terminal 2 and ground with CONSULT-II or tester.
SEF690U
Voltage: Approximately 5V
OK or NG
OK
©
GO TO 3.
NG
©
GO TO 2.
2
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors F27, F111
I
Harness for open or short between ECM and engine coolant temperature sensor
©
Repair harness or connectors.
3
CHECK GROUND CIRCUIT
1. Turn ignition switch “OFF”.
2. Check harness continuity between engine coolant temperature sensor terminal 1 and engine ground.
Refer to wiring diagram.
Continuity should exist.
3. Also check harness for short to power.
OK or NG
OK
©
GO TO 5.
NG
©
GO TO 4.
DTC 0103 ENGINE COOLANT TEMPERATURE SENSOR (ECTS) (CIRCUIT)
Diagnostic Procedure
EC-108
4
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors F27, F111
I
Harness connectors F4, M60
I
Harness for open or short between ECM and engine coolant temperature sensor
I
Harness for open or short between engine coolant temperature sensor and TCM (Transmission Control Module)
©
Repair open circuit or short to power in harness or connectors.
5
CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to “Component Inspection”, EC-109.
OK or NG
OK
©
GO TO 6.
NG
©
Replace engine coolant temperature sensor.
6
CHECK INTERMITTENT INCIDENT
Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-82.
©
INSPECTION END
SEF152P
SEF012P
Component Inspection
NMEC0687
ENGINE COOLANT TEMPERATURE SENSOR
NMEC0687S01
Check resistance as shown in the figure.
<Reference data>
Temperature °C (°F)
Resistance k
Ω
20 (68)
2.1 - 2.9
50 (122)
0.68 - 1.00
90 (194)
0.236 - 0.260
If NG, replace engine coolant temperature sensor.
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC 0103 ENGINE COOLANT TEMPERATURE SENSOR (ECTS) (CIRCUIT)
Diagnostic Procedure (Cont’d)
EC-109
SEC393C
Component Description
NMEC0688
IGNITION COIL & POWER TRANSISTOR
NMEC0688S01
The ignition signal from the ECM is sent to and amplified by the
power transistor. The power transistor turns on and off the ignition
coil primary circuit. This on-off operation induces the proper high
voltage in the coil secondary circuit.
CONSULT-II Reference Value in Data Monitor
Mode
NMEC0689
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
IGN TIMING
I
Engine: After warming up
I
Air conditioner switch: OFF
I
Shift lever: “N”
I
No-load
Idle
15°
±
2° BTDC
2,000 rpm
More than 25° BTDC
ECM Terminals and Reference Value
NMEC0690
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 grond other than ECM terminals, such as the ground.
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
Engine speed is 2,000 rpm
0.1 - 1.0V
SEC360C
DTC 0201 IGNITION SIGNAL
Component Description
EC-110
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