Infiniti G20 (P11). Manual — part 220
System Description
NCEC0505
COOLING FAN CONTROL
NCEC0505S01
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
Refrigerant pressure sensor
Refrigerant pressure
The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refriger-
ant pressure and air conditioner ON signal. The control system has 3-step control [HIGH/LOW/OFF].
OPERATION
NCEC0505S02
SEF932X
CONSULT-II Reference Value in Data Monitor
Mode
NCEC0506
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
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0217 COOLANT OVERTEMPERATURE ENRICHMENT PROTECTION
System Description
EC-291
MONITOR ITEM
CONDITION
SPECIFICATION
COOLING FAN
I
After warming up engine, idle
the engine.
I
Air conditioner switch: OFF
Engine coolant temperature is
94°C (201°F) or less
OFF
Engine coolant temperature is
between 95°C (203°F) and 104°C
(219°F)
LOW
Engine coolant temperature is
105°C (221°F) or more
HIGH
ECM Terminals and Reference Value
NCEC0643
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)
12
LG
Cooling fan relay (High)
[Engine is running]
I
Cooling fan is not operating
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
I
Cooling fan (High) is operating
0 - 0.6V
13
L/Y
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
On Board Diagnosis Logic
NCEC0507
This diagnosis checks whether the engine coolant temperature is
extraordinary high, even when the load is not heavy.
When malfunction is detected, the malfunction indicator lamp (MIL)
will light up even in the first trip.
Malfunction is detected when engine coolant temperature is exces-
sively high under normal engine speed.
Possible Cause
NCEC0508
I
Harness or connectors
(The cooling fan circuit is open or shorted)
I
Cooling fan
I
Thermostat
I
Improper ignition timing
I
Engine coolant temperature sensor
I
Blocked radiator
I
Blocked front end (Improper fitting of nose mask)
DTC P0217 COOLANT OVERTEMPERATURE ENRICHMENT PROTECTION
CONSULT-II Reference Value in Data Monitor Mode (Cont’d)
EC-292
I
Crushed vehicle frontal area (Vehicle frontal is collided but not
repaired)
I
Blocked air passage by improper installation of front fog lamp
or fog lamps.
I
Improper mixture ratio of coolant
I
Damaged bumper
For
more
information,
refer
to
“MAIN
12
CAUSES
OF
OVERHEATING”, EC-321.
CAUTION:
When a malfunction is indicated, be sure to replace the cool-
ant. Refer to MA-14, “Changing Engine Coolant”. Also, replace
the engine oil. Refer to MA-18, “Changing Engine Oil”.
1)
Fill radiator with coolant up to specified level with a fill-
ing speed of 2 liters per minute. Be sure to use coolant
with the proper mixture ratio. Refer to MA-12, “Anti-
freeze Coolant Mixture Ratio”.
2)
After refilling coolant, run engine to ensure that no
water-flow noise is emitted.
Overall Function Check
NCEC0509
Use this procedure to check the overall function of the coolant
overtemperature enrichment protection 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 the 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.
SEF621W
WITH CONSULT-II
NCEC0509S01
1)
Check the coolant level and mixture ratio (using coolant tester)
in the reservoir tank and radiator.
Allow engine to cool before checking coolant level and
mixture ratio.
I
If the coolant level in the reservoir and/or radiator is below the
proper range, go to “Diagnostic Procedure”, EC-298 (A/T mod-
els) or EC-309 (M/T models).
I
If the coolant mixture ratio is out of the range of 45 to 55%,
replace the coolant in the following procedure MA-14, “Chang-
ing Engine Coolant”.
a)
Fill radiator with coolant up to specified level with a filling speed
of 2 liters per minute like pouring coolant from a kettle. Be sure
to use coolant with the proper mixture ratio. Refer to MA-12,
“Anti-freeze Coolant Mixture Ratio”.
b)
After refilling coolant, run engine to ensure that no water-flow
noise is emitted.
c)
After checking or replacing coolant, go to step 3 below.
2)
Ask the customer if engine coolant has been added. If it has
been added, go to “Diagnostic Procedure”, EC-298 (A/T mod-
els) or EC-309 (M/T models). After repair, go to the next step.
3)
Start engine and let it idle.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0217 COOLANT OVERTEMPERATURE ENRICHMENT PROTECTION
Possible Cause (Cont’d)
EC-293
4)
Make sure that A/C switch is “OFF” and air conditioner is not
operating. If NG, check air conditioner circuit. Refer to HA-23
or HA-140, “TROUBLE DIAGNOSES”. After repair, go to the
next step.
5)
Perform “ENG COOLANT TEMP” in “ACTIVE TEST” mode
with CONSULT-II.
a)
Set “ENG COOLANT TEMP” to 95°C (203°F) and make sure
that cooling fan operates at low speed.
If NG, go to “Diagnostic Procedure”, EC-298 (A/T models) or
EC-309 (M/T models).
b)
Set “ENG COOLANT TEMP” to 105°C (221°F) and make sure
that cooling fan operates at high speed. If NG, go to “Diagnos-
tic Procedure”, EC-298. After repair, go to the next step.
6)
Check for blocked coolant passage.
a)
Warm up engine to normal operating temperature, then grasp
radiator upper hose and lower hose and make sure that cool-
ant flows.
If NG, go to “Diagnostic Procedure”, EC-298 (A/T models) or
EC-309 (M/T models). After repair, go to the next step.
Be extremely careful not to touch any moving or adjacent
parts.
7)
Check for blocked radiator air passage.
a)
When market fog lamps have been installed, check for dam-
aged fans and clogging in the condenser and radiator.
b)
Check the front end for clogging caused by insects or debris.
c)
Check for improper fitting of front-end cover, damaged radia-
tor grille or bumper, damaged vehicle front.
If NG, take appropriate action and then go to the next step.
8)
Check function of ECT sensor.
Refer to step 7 of “Diagnostic Procedure”, EC-298 (A/T mod-
els) or EC-309 (M/T models).
If NG, replace ECT sensor and go to the next step.
9)
Check ignition timing. Refer to basic inspection, EC-107.
Make sure that ignition timing is 15°
±
2° at idle.
If NG, adjust ignition timing and then recheck.
WITH GST
NCEC0509S02
1)
Check the coolant level and mixture ratio (using coolant tester)
in the reservoir tank and radiator.
Allow engine to cool before checking coolant level and
mixture ratio.
I
If the coolant level in the reservoir and/or radiator is below the
proper range, and go to “Diagnostic Procedure”, EC-298 (A/T
models) or EC-309 (M/T models).
I
If the coolant mixture ratio is out of the range of 45 to 55%,
replace the coolant in the following procedure MA-14, “Chang-
ing Engine Coolant”.
a)
Fill radiator with coolant up to specified level with a filling speed
of 2 liters per minute like pouring coolant from a kettle. Be sure
to use coolant with the proper mixture ratio. Refer to MA-12,
“Anti-freeze Coolant Mixture Ratio”.
b)
After refilling coolant, run engine to ensure that no water-flow
noise is emitted.
c)
After checking or replacing coolant, go to step 3 below.
2)
Ask the customer if engine coolant has been added. If it has
been added, go to “Diagnostic Procedure”, EC-298 (A/T mod-
els) or EC-309 (M/T models). After repair, go to the next step.
3)
Start engine and let it idle.
DTC P0217 COOLANT OVERTEMPERATURE ENRICHMENT PROTECTION
Overall Function Check (Cont’d)
EC-294
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст