Nissan Silvia. Instruction — part 155
Main 12 Causes of Overheating
=NMEC0703
Engine
Step
Inspection item
Equipment
Standard
Reference page
OFF
1
I
Blocked radiator
I
Blocked condenser
I
Blocked radiator grille
I
Blocked bumper
I
Visual
No blocking
—
2
I
Coolant mixture
I
Coolant tester
50 - 50% coolant mixture See MA-9, “Engine Cool-
ant Mixture Ratio”.
3
I
Coolant level
I
Visual
Coolant up to MAX level
in reservoir tank and
radiator filler neck
See LC-15, “Changing
Engine Coolant”.
4
I
Radiator cap
I
Pressure tester
59 - 98 kPa
(0.59 - 0.98 bar, 0.6 - 1.0
kg/cm
2
, 9 - 14 psi) (Limit)
See LC-10, “System
Check”.
ON*
2
5
I
Coolant leaks
I
Visual
No leaks
See LC-10, “System
Check”.
ON*
2
6
I
Thermostat
I
Touch the upper and
lower radiator hoses
Both hoses should be
hot
See LC-13, “Thermostat”
and LC-14, “Radiator”.
ON*
1
7
I
Cooling fan
I
CONSULT-II
Operating
See “DTC P0208 OVER-
HEAT” (EC-120).
OFF
8
I
Combustion gas leak
I
Color checker chemi-
cal tester 4 Gas ana-
lyzer
Negative
—
ON*
3
9
I
Coolant temperature
gauge
I
Visual
Gauge less than 3/4
when driving
—
I
Coolant overflow to
reservoir tank
I
Visual
No overflow during driv-
ing and idling
See LC-15, “Changing
Engine Coolant”.
OFF*
4
10
I
Coolant return from
reservoir tank to radia-
tor
I
Visual
Should be initial level in
reservoir tank
See LC-16, “Refilling
Engine Coolant”.
OFF
11
I
Cylinder head
I
Straight gauge feeler
gauge
0.1 mm (0.004 in) Maxi-
mum distortion (warping)
See EM-43, “Inspection”,
“CYLINDER HEAD”.
12
I
Cylinder block and pis-
tons
I
Visual
No scuffing on cylinder
walls or piston
See EM-70, “Inspection”,
“CYLINDER BLOCK”.
*1: Turn the ignition switch ON.
*2: Engine running at 3,000 rpm for 10 minutes.
*3: Drive at 90 km/h (55 MPH) for 30 minutes and then let idle for 10 minutes.
*4: After 60 minutes of cool down time.
For more information, refer to LC-21, “OVERHEATING CAUSE ANALYSIS”.
SEF145X
Component Inspection
NMEC0704
COOLING FAN RELAYS-1 AND -2
NMEC0704S01
Check continuity between terminals 3 and 5.
Conditions
Continuity
12V direct current supply between terminals 1 and
2
Yes
No current supply
No
If NG, replace relay.
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC 0208 OVERHEAT (COOLING SYSTEM)
Main 12 Causes of Overheating
EC-135
SEC445C
COOLING FAN MOTOR
NMEC0704S03
1.
Disconnect cooling fan motor harness connectors.
2.
Supply cooling fan motor terminals with battery voltage and
check operation.
Speed
Terminals
(+)
(−)
Cooling fan motor
Low
1
3
High
1, 4
2, 3
Cooling fan motor should operate.
If NG, replace cooling fan motor.
DTC 0208 OVERHEAT (COOLING SYSTEM)
Component Inspection (Cont’d)
EC-136
SEF598K
Component Description
NMEC0705
The knock sensor is attached to the cylinder block. It senses
engine knocking using a piezoelectric element. A knocking vibration
from the cylinder block is sensed as vibrational pressure. This
pressure is converted into a voltage signal and sent to the ECM.
ECM Terminals and Reference Value
NMEC0706
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)
27
W
Knock sensor
[Engine is running]
I
Idle speed
Approximately 2.5V
On Board Diagnosis Logic
NMEC0707
DTC No.
Malfunction is detected when ...
Check Items (Possible Cause)
0304
I
An excessively low or high voltage from the knock sen-
sor is sent to ECM.
I
Harness or connectors
(The knock sensor circuit is open or shorted.)
I
Knock sensor
SEC447C
DTC Confirmation Procedure
NMEC0708
NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 5 seconds
before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that bat-
tery voltage is more than 10V at idle.
With CONSULT-II
1)
Turn ignition switch “ON” and select “DATA MONITOR” mode
with CONSULT-II.
2)
Start engine and run it for at least 5 seconds at idle speed.
3)
If DTC is detected, go to “Diagnostic Procedure”, EC-139.
Without CONSULT-II
1)
Start engine and run it for at least 5 seconds at idle speed.
2)
Turn ignition switch “OFF”, wait at least 5 seconds and then
turn “ON”.
3)
Perform “Diagnostic Test Mode II (Self-diagnostic results)” with
ECM.
4)
If DTC is detected, go to “Diagnostic Procedure”, EC-139.
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC 0304 KNOCK SENSOR (KS)
Component Description
EC-137
Wiring Diagram
NMEC0709
TEC804
DTC 0304 KNOCK SENSOR (KS)
Wiring Diagram
EC-138
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