Infiniti QX56 (Z62). Manual — part 588
EC-330
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P0448 EVAP CANISTER VENT CONTROL VALVE
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Clean rubber tube using an air blower.
2.
CHECK EVAP CANISTER VENT CONTROL VALVE
EC-327, "Component Inspection (EVAP Canister Vent Control Valve)"
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Replace EVAP canister vent control valve. Refer to
.
3.
CHECK IF EVAP CANISTER IS SATURATED WITH WATER
1.
Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached.
2.
Check if water will drain from the EVAP canister (1).
Does water drain from EVAP canister?
YES
>> GO TO 4.
NO
>> GO TO 6.
4.
CHECK EVAP CANISTER
Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor
attached.
The weight should be less than 2.5 kg (5.5 lb).
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
• EVAP canister for damage
• EVAP hose between EVAP canister and vehicle frame for clogging or poor connection
>> Repair hose or replace EVAP canister. Refer to
.
6.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR
1.
Disconnect EVAP control system pressure sensor harness connector.
2.
Check that water is not inside connectors.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace EVAP control system pressure sensor. Refer to
7.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-335, "Component Inspection (EVAP Control System Pressure Sensor)"
.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Replace EVAP control system pressure sensor. Refer to
8.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
>> INSPECTION END
2
: EVAP canister vent control valve
JSBIA0692ZZ
P0448 EVAP CANISTER VENT CONTROL VALVE
EC-331
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
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Component Inspection (EVAP Canister Vent Control Valve)
INFOID:0000000006288362
1.
CHECK EVAP CANISTER VENT CONTROL VALVE-I
1.
Turn ignition switch OFF.
2.
Remove EVAP canister vent control valve from EVAP canister.
3.
Check portion (A) of EVAP canister vent control valve for rust.
Is it rusted?
YES
>> Replace EVAP canister vent control valve. Refer to
.
NO
>> GO TO 2.
2.
CHECK EVAP CANISTER VENT CONTROL VALVE-II
WITH CONSULT-III
1.
Reconnect harness connectors disconnected.
2.
Turn ignition switch ON.
3.
Perform “VENT CONTROL/V” in “ACTIVE TEST” mode.
4.
Check air passage continuity and operation delay time.
Check that new O-ring is installed properly.
Operation takes less than 1 second.
WITHOUT CONSULT-III
1.
Disconnect EVAP canister vent control valve harness connector.
2.
Check air passage continuity and operation delay time under the following conditions.
Check that new O-ring is installed properly.
Operation takes less than 1 second.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Replace EVAP canister vent control valve. Refer to
.
3.
CHECK EVAP CANISTER VENT CONTROL VALVE-III
WITH CONSULT-III
1.
Clean the air passage [portion (A) to (B)] of EVAP canister vent control valve using an air blower.
2.
Perform “VENT CONTROL/V” in “ACTIVE TEST” mode.
JSBIA0693ZZ
VENT CONTROL/V Condition
Air passage continuity between (A) and (B)
ON
Not existed
OFF
Existed
JSBIA0694ZZ
Condition
Air passage continuity between (A) and (B)
12 V direct current supply between
terminals 1 and 2
Not existed
OFF
Existed
EC-332
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P0448 EVAP CANISTER VENT CONTROL VALVE
3.
Check air passage continuity and operation delay time.
Check that new O-ring is installed properly.
Operation takes less than 1 second.
WITHOUT CONSULT-III
1.
Clean the air passage [portion (A) to (B)] of EVAP canister vent control valve using an air blower.
2.
Check air passage continuity and operation delay time under the following conditions.
Check that new O-ring is installed properly.
Operation takes less than 1 second.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace EVAP canister vent control valve. Refer to
.
VENT CONTROL/V Condition
Air passage continuity between (A) and (B)
ON
Not existed
OFF
Existed
JSBIA0694ZZ
Condition
Air passage continuity between (A) and (B)
12 V direct current supply between
terminals 1 and 2
Not existed
OFF
Existed
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-333
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
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P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
DTC Logic
INFOID:0000000006288316
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Start engine and wait at least 40 seconds.
NOTE:
Do not depress accelerator pedal even slightly.
2.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006288317
1.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR
1.
Disconnect EVAP control system pressure sensor harness connector.
2.
Check that water is not inside connectors.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace harness connector.
2.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT
1.
Turn ignition switch ON.
2.
Check the voltage between EVAP control system pressure sensor harness connector and ground.
DTC No.
Trouble diagnosis name
(Trouble diagnosis con-
tent)
DTC detecting condition
Possible cause
P0451
EVAP SYS PRES SEN
(EVAP control system
pressure sensor perfor-
mance)
ECM detects a sloshing signal
from the EVAP control system
pressure sensor
• (EVAP control system pressure sensor circuit is shorted.)
Harness or connectors
(Battery current sensor circuit is open or shorted.)
(Accelerator pedal position sensor 2 circuit is shorted.)
[Camshaft position sensor (bank 1) circuit is shorted.]
(Crankshaft position sensor circuit is shorted.)
(Refrigerant pressure sensor circuit is shorted.)
• EVAP control system pressure sensor
• Battery current sensor
• Accelerator pedal position sensor
• Camshaft position sensor (bank 1)
• Crankshaft position sensor
• Refrigerant pressure sensor
EVAP control system
pressure sensor
Ground
Voltage (V)
Connector
Terminal
C17
3
Ground
Approx. 5 V
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