Infiniti I30 (A33). Manual — part 284
On Board Diagnosis Logic
NHEC0519
Engine coolant temperature has not risen enough to open the ther-
mostat even though the engine has run long enough.
This is due to a leak in the seal or the thermostat open stuck.
Malfunction is detected when the engine coolant temperature does
not reach to specified temperature even though the engine has run
long enough.
Possible Cause
NHEC0520
I
Thermostat function
I
Leakage from sealing portion of thermostat
I
Engine coolant temperature sensor
DTC Confirmation Procedure
NHEC0521
NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 seconds
before conducting the next test.
TESTING CONDITION:
I
For best results, perform at ambient temperature of –10°C
(14°F) or higher.
I
For best results, perform at engine coolant temperature of
–10°C (14°F) to 60°C (140°F).
WITH CONSULT-II
NHEC0521S01
1)
Replace thermostat with new one. Refer to LC-15, “Thermo-
stat”. Use only a genuine NISSAN thermostat as a replace-
ment. If an incorrect thermostat is used, the MIL may come on.
2)
Turn ignition switch “ON”.
3)
Select “COOLAN TEMP/S” in “DATA MONITOR” mode with
CONSULT-II.
4)
Check that the “COOLAN TEMP/S” is above 60°C (140°F).
If it is below 60°C (140°F), go to following step.
If it is above 60°C (140°F), stop engine and cool down the
engine to less than 60°C (140°F), then retry from step 1.
5)
Drive vehicle for 10 consecutive minutes under the following
conditions.
VHCL SPEED SE
80 - 120 km/h (50 - 75 MPH)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-452.
WITH GST
NHEC0521S02
1)
Follow the prodedure “WITH CONSULT-II” above.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1126 THERMOSTAT FUNCTION
On Board Diagnosis Logic
EC-451
Diagnostic Procedure
NHEC0522
1
CHECK ENGINE COOLANT TEMPERATURE SENSOR
1. Turn ignition switch OFF.
2. Remove engine coolant temperature sensor.
3. Check resistance between engine coolant temperature sensor terminals under the following conditions.
SEF304X
OK or NG
OK
©
INSPECTION END
NG
©
Replace engine coolant temperature sensor.
DTC P1126 THERMOSTAT FUNCTION
Diagnostic Procedure
EC-452
Description
NHEC0523
If DTC P1130 is displayed with P1165, first perform trouble diag-
nosis for DTC P1165, EC-478.
SYSTEM DESCRIPTION
NHEC0523S01
Sensor
Input Signal to ECM
ECM func-
tion
Actuator
Throttle position sensor
Throttle position
Swirl control
valve con-
trol
Swirl control valve control sole-
noid valve
"
Vacuum signal
Swirl control valve actuator
"
Swirl control valve
Ignition switch
Start signal
Crankshaft position sensor (POS)
Engine speed (POS signal)
Crankshaft position sensor (REF)
Engine speed (REF signal)
Mass air flow sensor
Amount of intake air
Engine coolant temperature sensor
Engine coolant temperature
This system has a swirl control valve in the intake passage of each
cylinder.
While idling and during low engine speed operation, the swirl con-
trol valve closes. Thus the velocity of the air in the intake passage
increases, promoting the vaporization of the fuel and producing a
swirl in the combustion chamber.
Because of this operation, this system tends to increase the burn-
ing speed of the gas mixture, improve fuel consumption, and
increase the stability in running conditions.
Also, except when idling and during low engine speed operation,
this system opens the swirl control valve. In this condition, this
system tends to increase power by improving intake efficiency via
reduction of intake flow resistance, intake flow.
The solenoid valve controls swirl control valve’s shut/open condi-
tion. This solenoid valve is operated by the ECM.
Throttle position
sensor (Idle posi-
tion)
Engine speed
Swirl control valve
control solenoid
valve
Swirl control valve
ON
Below 3,200 rpm
ON
Closed
OFF
Less than 3,200
rpm
ON
Closed
More than 3,600
rpm
OFF
Open
When engine coolant temperature is below 10°C (50°F) and above 55°C (131°F),
swirl control valve is kept open regardless of above condition.
SEF372X
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1130 SWIRL CONTROL VALVE CONTROL SOLENOID VALVE
Description
EC-453
SEF272X
COMPONENT DESCRIPTION
NHEC0523S02
Swirl Control Valve Control Solenoid Valve
NHEC0523S0201
The swirl control valve control solenoid valve responds to signals
from the ECM. When the ECM sends an ON (ground) signal, the
solenoid valve is bypassed to apply intake manifold vacuum to the
swirl control valve actuator. This operation closes the swirl control
valve. When the ECM sends an OFF signal, the vacuum signal is
cut and the swirl control valve opens.
CONSULT-II Reference Value in Data Monitor
Mode
NHEC0524
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
SWRL CONT S/V
I
Engine speed: Idle
Engine coolant temperature is
between 15°C (59°F) to 50°C
(122°F).
ON
Engine coolant temperature is
above 55°C (131°F).
OFF
On Board Diagnosis Logic
NHEC0526
Malfunction is detected when
(Malfunction A) An improper voltage signal is sent to ECM through
swirl control valve control solenoid valve,
(Malfunction B) The vacuum signal is not sent to swirl control
valve under specified driving conditions, even though swirl control
valve control solenoid valve is ON,
(Malfunction C) The vacuum signal is sent to swirl control valve
even though swirl control valve control solenoid valve is OFF.
Possible Cause
NHEC0527
MALFUNCTION A
NHEC0527S01
I
Harness or connectors
(The swirl control valve control solenoid valve circuit is open or
shorted.)
I
Swirl control valve control solenoid valve
MALFUNCTION B
NHEC0527S02
I
Harness or connector
(The swirl control valve control solenoid valve circuit is open.)
I
Swirl control valve control solenoid valve
I
Intake system
(Intake air leaks)
I
Hoses and tubes between intake manifold, vacuum tank and
swirl control valve actuator
I
Swirl control valve actuator
I
Swirl control valve control vacuum check switch
I
Mass air flow sensor
I
Crankshaft position sensor (REF)
I
Throttle position sensor
DTC P1130 SWIRL CONTROL VALVE CONTROL SOLENOID VALVE
Description (Cont’d)
EC-454
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