Nissan Silvia. Instruction — part 151
SEF371Q
Component Inspection
=NMEC0695
IGNITION COIL WITH POWER TRANSISTOR
NMEC0695S01
1.
Disconnect ignition coil with power transistor harness connec-
tor.
2.
Check ignition coil with power transistor for resistance as show
in the figure.
Terminal No. (Polarity)
Resistance
Ω
[at 25°C (77°F)]
3 (+) - 2 (−)
Except 0 or
∞
1 (+) - 3 (−)
Except 0
1 (+) - 2 (−)
If NG, replace ignition coil with power transistor assembly.
SEF123Y
ECM RELAY
NMEC0695S02
1.
Apply 12V direct current between ECM relay terminals 1 and
2.
2.
Check continuity between ECM relay terminals 3 and 5, 6 and
7.
Condition
Continuity
12V direct current supply between ter-
minals 1 and 2
Yes
OFF
No
If NG, replace ECM relay.
SEF124Y
CONDENSER
NMEC0695S03
1.
Disconnect condenser harness connector.
2.
Check condenser continuity between terminals 1 and 2.
Resistance: Above 100 M
Ω
at 20°C (68°F)
If NG, replace condenser.
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC 0201 IGNITION SIGNAL
Component Inspection
EC-119
System Description
NMEC0696
COOLING FAN CONTROL
NMEC0696S01
Sensor
Input Signal to ECM
ECM func-
tion
Actuator
Vehicle speed sensor
Vehicle speed
Cooling fan
control
Cooling fan relay(s)
Engine coolant temperature sensor
Engine coolant temperature
Air conditioner switch
Air conditioner “ON” signal
Ignition switch
Start signal
The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, and air
conditioner ON signal. The control system has 3-step control [HIGH/LOW/OFF].
OPERATION
NMEC0696S02
SEF988P
CONSULT-II Reference Value in Data Monitor
Mode
NMEC0697
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
AIR COND SIG
I
Engine: After warming up, idle
the engine
Air conditioner switch: OFF
OFF
Air conditioner switch: ON
(Compressor operates)
ON
COOLING FAN
I
After warming up engine, idle
the engine.
I
Air conditioner switch: OFF
Engine coolant temperature is less
than 95°C (203°F)
OFF
Engine coolant temperature is
95°C (203°F) and 100°C (212°F)
LOW
Engine coolant temperature is
100°C (212°F) or more
HIGH
ECM Terminals and Reference Value
NMEC0698
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.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
9
P/B
Cooling fan relay (Low)
[Engine is running]
I
Cooling fan is not operating
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
I
Cooling fan is operating
0 - 0.6V
DTC 0208 OVERHEAT (COOLING SYSTEM)
System Description
EC-120
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
10
L/G
Cooling fan relay (High)
[Engine is running]
I
Cooling fan is not operating
I
Cooling fan is operating at low speed
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
I
Cooling fan is operating at high speed
0 - 0.6V
On Board Diagnosis Logic
NMEC0699
If the cooling fan or another component in the cooling system malfunctions, engine coolant temperature will
rise.
When the engine coolant temperature reaches an abnormally high temperature condition, a malfunction is
indicated.
Diagnostic
Trouble Code
No.
Malfunction is detected when ...
Check Items
(Possible Cause)
0208
I
Cooling fan does not operate properly (Overheat).
I
Cooling fan system does not operate properly (Over-
heat).
I
Engine coolant was not added to the system using the
proper filling method.
I
Harness or connectors
(The cooling fan circuit is open or shorted.)
I
Cooling fan
I
Radiator hose
I
Radiator
I
Radiator cap
I
Water pump
I
Thermostat
For more information, refer to “MAIN 12 CAUSES
OF OVERHEATING”, EC-135.
CAUTION:
When a malfunction is indicated, be sure to replace the coolant following the procedure in the LC-15,
“Changing Engine Coolant”. Also, replace the engine oil.
1) Fill radiator with coolant up to specified level with a filling speed of 2 liters per minute. Be sure to use
coolant with the proper mixture ratio. Refer to MA-9, “Engine Coolant Mixture Ratio”.
2) After refilling coolant, run engine to ensure that no water-flow noise is emitted.
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC 0208 OVERHEAT (COOLING SYSTEM)
ECM Terminals and Reference Value (Cont’d)
EC-121
SEF621W
Overall Function Check
NMEC0700
SEF111X
SEC443C
SEC444C
Use this procedure to check the overall function of the cooling fan.
During this check, a DTC might not be confirmed.
WARNING:
Never remove the radiator cap when the engine is hot. Serious
burns could be caused by high pressure fluid escaping from
the radiator.
Wrap a thick cloth around cap. Carefully remove the cap by
turning it a quarter turn to allow built-up pressure to escape.
Then turn the cap all the way off.
With CONSULT-II
1)
Check the coolant level in the reservoir tank and radiator.
Allow engine to cool before checking coolant level.
If the coolant level in the reservoir tank and/or radiator is below
the proper range, skip the following steps and go to “Diagnos-
tic Procedure”, EC-124.
2)
Confirm whether customer filled the coolant or not. If customer
filled the coolant, skip the following steps and go to “Diagnos-
tic Procedure”, EC-124.
3)
Turn ignition switch “ON”.
4)
Perform “COOLING FAN” in “ACTIVE TEST” mode with CON-
SULT-II.
5)
If the results are NG, go to “Diagnostic Procedure”, EC-124.
Without CONSULT-II
1)
Check the coolant level in the reservoir tank and radiator.
Allow engine to cool before checking coolant level.
If the coolant level in the reservoir tank and/or radiator is below
the proper range, skip the following steps and go to “Diagnos-
tic Procedure”, EC-124.
2)
Confirm whether customer filled the coolant or not. If customer
filled the coolant, skip the following steps and go to “Diagnos-
tic Procedure”, EC-124.
3)
Start engine.
Be careful not to overheat engine.
4)
Set temperature control lever to full cold position.
5)
Turn air conditioner switch “ON”.
6)
Turn blower fan switch “ON”.
7)
Run engine at idle for a few minutes with air conditioner oper-
ating.
Be careful not to overheat engine.
8)
Make sure that cooling fan operates at low speed.
If NG, go to “Diagnostic Procedure”, EC-124.
If OK, go to the following step.
9)
Turn ignition switch “OFF”.
10) Turn air conditioner switch and blower fan switch “OFF”.
11) Disconnect engine coolant temperature sensor harness con-
nector.
12) Connect 150
Ω
resistor to engine coolant temperature sensor
harness connector.
13) Restart engine and make sure that cooling fan operates at
higher speed than low speed.
Be careful not to overheat engine.
14) If NG, go to “Diagnostic Procedure”, EC-124.
DTC 0208 OVERHEAT (COOLING SYSTEM)
Overall Function Check
EC-122
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