Nissan Frontier. Manual — part 471
ON BOARD REFUELING VAPOR RECOVERY (ORVR)
EC-455
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
d. Apply vacuum pressure to hose end [
−13.3 kPa (−100 mmHg, −3.94 inHg)] with fuel gauge retainer
remaining open and check that the pressure is applicable.
BBIA0568E
EC-456
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
POSITIVE CRANKCASE VENTILATION
POSITIVE CRANKCASE VENTILATION
Description
INFOID:0000000009481161
SYSTEM DESCRIPTION
This system returns blow-by gas to the intake manifold.
The positive crankcase ventilation (PCV) valve is provided to conduct crankcase blow-by gas to the intake
manifold. During partial throttle operation of the engine, the intake manifold sucks the blow-by gas through the
PCV valve. Normally, the capacity of the valve is sufficient to handle any blow-by and a small amount of venti-
lating air. The ventilating air is then drawn from the air inlet tubes into the crankcase. In this process the air
passes through the hose connecting air inlet tubes to rocker cover. Under full-throttle condition, the manifold
vacuum is insufficient to draw the blow-by flow through the valve. The flow goes through the hose connection
in the reverse direction.
On vehicles with an excessively high blow-by, the valve does not
meet the requirement. This is because some of the flow will go
through the hose connection to the air inlet tubes under all condi-
tions.
Component Inspection
INFOID:0000000009481162
PCV (POSITIVE CRANKCASE VENTILATION) VALVE
With engine running at idle, remove PCV valve from rocker cover. A
properly working valve makes a hissing noise as air passes through
it. A strong vacuum should be felt immediately when a finger is
placed over valve inlet.
PBIB0492E
PBIB1588E
PBIB1589E
POSITIVE CRANKCASE VENTILATION
EC-457
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
PCV VALVE VENTILATION HOSE
1. Check hoses and hose connections for leaks.
2. Disconnect all hoses and clean with compressed air. If any hose
cannot be freed of obstructions, replace.
S-ET277
EC-458
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
REFRIGERANT PRESSURE SENSOR
REFRIGERANT PRESSURE SENSOR
Component Description
INFOID:0000000009481163
The refrigerant pressure sensor is installed at the condenser of the
air conditioner system. The sensor uses an electrostatic volume
pressure transducer to convert refrigerant pressure to voltage. The
voltage signal is sent to ECM, and ECM controls cooling fan system.
Diagnosis Procedure
INFOID:0000000009481164
1.
CHECK REFRIGERANT PRESSURE SENSOR OVERALL FUNCTION
1. Start engine and warm it up to normal operating temperature.
2. Turn A/C switch and blower fan switch ON.
3. Check voltage between ECM terminal 39 and ground with CONSULT or tester.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 2.
2.
CHECK GROUND CONNECTIONS
1. Turn A/C switch and blower fan switch OFF.
2. Stop engine.
3. Loosen and retighten two ground screws on the body. Refer to
.
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace ground connections.
3.
CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT
BBIA0627E
PBIB2657E
Voltage: 1.0 - 4.0V
BBIA0614E
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст