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EC-242
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P0452 EVAP CONTROL S
YSTEM PRESSURE SENSOR
6. Start engine and wait at least 20 seconds.
7. Check 1st trip DTC.
8. If 1st trip DTC is detected, go to EC-242, " INFINITI QX56 2009 Factory Service Manual
EC-242
< COMPONENT DIAGNOSIS >[VK56DE]
P0452 EVAP CONTROL S
YSTEM PRESSURE SENSOR
6. Start engine and wait at least 20 seconds.
7. Check 1st trip DTC.
8. If 1st trip DTC is detected, go to EC-242, "](/manual-img/42/57031/w960_57031-1568.png)
EC-242
< COMPONENT DIAGNOSIS >[VK56DE]
P0452 EVAP CONTROL S
YSTEM PRESSURE SENSOR
6. Start engine and wait at least 20 seconds.
7. Check 1st trip DTC.
8. If 1st trip DTC is detected, go to EC-242, "Diagnosis Procedure"
.
WITH GST
1. Start engine and warm it up to normal operating temperature.
2. Check that voltage between ECM terminal 107 (Fuel tank tem-
perature sensor signal) and ground is less than 4.2V.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Start engine and wait at least 20 seconds.
5. Select Service $07 with GST. If 1st trip DTC is detected, go to EC-242, "Diagnosis Procedure"
.
Diagnosis ProcedureINFOID:0000000003771513
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to EC-85, "Ground Inspection"
.
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
2.CHECK CONNECTOR
1. Disconnect EVAP control system pressure sensor harness connector.
2. Check sensor harness connector for water.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace harness connector.
PBIB1110E
BBIA0354E
Water should not exist.
BBIA0443E
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3.CHECK EVAP CONTROL SYS
TEM PRESSURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition swi INFINITI QX56 2009 Factory Service Manual
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3.CHECK EVAP CONTROL SYS
TEM PRESSURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition swi](/manual-img/42/57031/w960_57031-1569.png)
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3.CHECK EVAP CONTROL SYS
TEM PRESSURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between EVAP control system pressure sensor terminal 3 and ground with CONSULT-III or tester.
OK or NG
OK >> GO TO 5.
NG >> GO TO 4.
4.DETECT MALFUNCTIONING PART
Check the following.
Harness connectors C1, E41
Harness connectors E5, F14
Harness for open or short between EVAP c ontrol system pressure sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between EVAP control s ystem pressure sensor terminal 1 and ECM terminal
67.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 7.
NG >> GO TO 6.
6.DETECT MALFUNCTIONING PART
Check the following.
Harness connectors C1, E41
Harness connectors E5, F14
Harness for open or short between EVAP c ontrol system pressure sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
7.CHECK EVAP CONTROL SYSTEM PRESSURE SENS OR INPUT SIGNAL CIRCUIT FOR OPEN AND
SHORT
1. Check harness continuity between ECM terminal 32 and EVAP control system pressure sensor terminal 2.
Refer to Wiring Diagram.
2. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 9.
NG >> GO TO 8.
8.DETECT MALFUNCTIONING PART Voltage: Approximately 5V
PBIB0138E
Continuity should exist.
Continuity should exist.
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EC-244
< COMPONENT DIAGNOSIS >[VK56DE]
P0452 EVAP CONTROL S
YSTEM PRESSURE SENSOR
Check the following.
Harness connectors C1, E41
Harness connectors E5, F14
Harness for open or short between EV INFINITI QX56 2009 Factory Service Manual
EC-244
< COMPONENT DIAGNOSIS >[VK56DE]
P0452 EVAP CONTROL S
YSTEM PRESSURE SENSOR
Check the following.
Harness connectors C1, E41
Harness connectors E5, F14
Harness for open or short between EV](/manual-img/42/57031/w960_57031-1570.png)
EC-244
< COMPONENT DIAGNOSIS >[VK56DE]
P0452 EVAP CONTROL S
YSTEM PRESSURE SENSOR
Check the following.
Harness connectors C1, E41
Harness connectors E5, F14
Harness for open or short between EVAP control system pressure sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
9.CHECK EVAP CONTROL SY STEM PRESSURE SENSOR
Refer to EC-244, "Component Inspection"
.
OK or NG
OK >> GO TO 10.
NG >> Replace EVAP control system pressure sensor.
10.CHECK INTERMITTENT INCIDENT
Refer to GI-35, "How to Check Terminal"
and GI-38, "Intermittent Incident".
>> INSPECTION END
Component InspectionINFOID:0000000003771514
EVAP CONTROL SYSTEM PRESSURE SENSOR
1. Remove EVAP control system pressure sensor wit h its harness connector connected from EVAP canister.
Always replace O-ring with a new one.
2. Install a vacuum pump to EVAP control system pressure sensor.
3. Turn ignition switch ON and check output voltage between ECM terminal 32 and ground under the following conditions.
CAUTION:
Always calibrate the vacuum pump gauge when using it.
Do not apply below -93.3 kP a (-700 mmHg, -27.56 inHg) or
pressure over 101.3 kPa (760 mmHg, 29.92 inHg).
4. If NG, replace EVAP control system pressure sensor.
Applied vacuum [kPa (mmHg, inHg)] Voltage (V)
Not applied 1.8 - 4.8
-26.7 (-200, -7.87) 2.1 to 2.5 lower than above value
PBIB1173E
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PRESSURE SENSOR
Component DescriptionINFOID:000000000377151 INFINITI QX56 2009 Factory Service Manual
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PRESSURE SENSOR
Component DescriptionINFOID:000000000377151](/manual-img/42/57031/w960_57031-1571.png)
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P0453 EVAP CONTROL SYSTEM
PRESSURE SENSOR
Component DescriptionINFOID:0000000003771515
The EVAP control system pressure sens or detects pressure in the purge line. The sensor output voltage to the
ECM increases as pressure increases.
On Board Diagnosis LogicINFOID:0000000003771516
NOTE:
If DTC P0453 is displayed with DTC P0643, first pe rform the trouble diagnosis for DTC P0643. Refer to
EC-285
.
DTC Confirmation ProcedureINFOID:0000000003771517
NOTE:
If DTC Confirmation Procedure has been previously conduc ted, always perform the following before conduct-
ing the next step.
1. Turn ignition swich OFF and wait at least 10 seconds.
2. Turn ignition swich ON.
3. Turn ignition swich OFF and wait at least 10 seconds.
TESTING CONDITION:
Always perform test at a temperature of 5 °C (41 °F) or more.
WITH CONSULT-III
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
BBIA0443E
PBIB1207E
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0453
0453 EVAP control system pressure
sensor high input An excessively high voltage from the
sensor is sent to ECM. Harness or connectors
(The sensor circuit is open or shorted.)
EVAP control system pressure sensor
EVAP canister vent control valve
EVAP canister
Rubber hose from EVAP canister vent
control valve to vehicle frame
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EC-246
< COMPONENT DIAGNOSIS >[VK56DE]
P0453 EVAP CONTROL S
YSTEM PRESSURE SENSOR
3. Turn ignition switch ON.
4. Select “DATA MONITOR” mode with CONSULT-III.
5. Make sure that “FUEL T/TMP SE” INFINITI QX56 2009 Factory Service Manual
EC-246
< COMPONENT DIAGNOSIS >[VK56DE]
P0453 EVAP CONTROL S
YSTEM PRESSURE SENSOR
3. Turn ignition switch ON.
4. Select “DATA MONITOR” mode with CONSULT-III.
5. Make sure that “FUEL T/TMP SE”](/manual-img/42/57031/w960_57031-1572.png)
EC-246
< COMPONENT DIAGNOSIS >[VK56DE]
P0453 EVAP CONTROL S
YSTEM PRESSURE SENSOR
3. Turn ignition switch ON.
4. Select “DATA MONITOR” mode with CONSULT-III.
5. Make sure that “FUEL T/TMP SE” is more than 0°C (32 °F).
6. Start engine and wait at least 20 seconds.
7. Check 1st trip DTC.
8. If 1st trip DTC is detected, go to EC-246, "Diagnosis Procedure"
.
WITH GST
1. Start engine and warm it up to normal operating temperature.
2. Check that voltage between ECM terminal 107 (Fuel tank tem-
perature sensor signal) and ground is less than 4.2V.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Start engine and wait at least 20 seconds.
5. Select Service $07 with GST. If 1st trip DTC is detected, go to EC-246, "Diagnosis Procedure"
.
Diagnosis ProcedureINFOID:0000000003771518
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to EC-85, "Ground Inspection"
.
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
2.CHECK CONNECTOR
1. Disconnect EVAP control system pressure sensor harness connector.
2. Check sensor harness connector for water.
OK or NG
PBIB1110E
BBIA0354E
Water should not exist.
BBIA0443E
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OK >> GO TO 3.
NG >> Repair or replace harness connector.
3.CHECK EVAP CONTROL SYS
TEM INFINITI QX56 2009 Factory Service Manual
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OK >> GO TO 3.
NG >> Repair or replace harness connector.
3.CHECK EVAP CONTROL SYS
TEM](/manual-img/42/57031/w960_57031-1573.png)
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OK >> GO TO 3.
NG >> Repair or replace harness connector.
3.CHECK EVAP CONTROL SYS
TEM PRESSURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between EVAP control system pressure sensor terminal 3 and ground with CONSULT-III or tester.
OK or NG
OK >> GO TO 5.
NG >> GO TO 4.
4.DETECT MALFUNCTIONING PART
Check the following.
Harness connectors C1, E41
Harness connectors E5, F14
Harness for open or short between EVAP c ontrol system pressure sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between EVAP control s ystem pressure sensor terminal 1 and ECM terminal
67.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 7.
NG >> GO TO 6.
6.DETECT MALFUNCTIONING PART
Check the following.
Harness connectors C1, E41
Harness connectors E5, F14
Harness for open or short between EVAP c ontrol system pressure sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
7.CHECK EVAP CONTROL SYSTEM PRESSURE SENS OR INPUT SIGNAL CIRCUIT FOR OPEN AND
SHORT
1. Check harness continuity between ECM terminal 32 and EVAP control system pressure sensor terminal 2.
Refer to Wiring Diagram.
2. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 9.
NG >> GO TO 8. Voltage: Approximately 5V
PBIB0138E
Continuity should exist.
Continuity should exist.
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EC-248
< COMPONENT DIAGNOSIS >[VK56DE]
P0453 EVAP CONTROL S
YSTEM PRESSURE SENSOR
8.DETECT MALFUNCTIONING PART
Check the following.
Harness connectors C1, E41
Harness connectors E5, F14
Harness INFINITI QX56 2009 Factory Service Manual
EC-248
< COMPONENT DIAGNOSIS >[VK56DE]
P0453 EVAP CONTROL S
YSTEM PRESSURE SENSOR
8.DETECT MALFUNCTIONING PART
Check the following.
Harness connectors C1, E41
Harness connectors E5, F14
Harness](/manual-img/42/57031/w960_57031-1574.png)
EC-248
< COMPONENT DIAGNOSIS >[VK56DE]
P0453 EVAP CONTROL S
YSTEM PRESSURE SENSOR
8.DETECT MALFUNCTIONING PART
Check the following.
Harness connectors C1, E41
Harness connectors E5, F14
Harness for open or short between EVAP control system pressure sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
9.CHECK RUBBER TUBE
1. Disconnect rubber tube connected to EV AP canister vent control valve.
2. Check the rubber tube for clogging, vent or kinked.
OK or NG
OK >> GO TO 10.
NG >> Clean the rubber tube using an air blower, repair or replace rubber tube.
10.CHECK EVAP CANISTER VENT CONTROL VALVE
Refer to EC-232, "Component Inspection"
.
OK or NG
OK >> GO TO 11.
NG >> Replace EVAP canister vent control valve.
11 .CHECK EVAP CONTROL S YSTEM PRESSURE SENSOR
Refer to EC-249, "Component Inspection"
.
OK or NG
OK >> GO TO 12.
NG >> Replace EVAP control system pressure sensor.
12.CHECK IF EVAP CANISTER 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.
Ye s o r N o
Yes >> GO TO 13.
No >> GO TO 15.
13.CHECK EVAP CANISTER
Weigh the EVAP canister with the EV AP canister vent control valve and EVAP control system pressure sensor
attached.
The weight should be less than 2.5 kg (5.5 lb).
OK or NG
OK >> GO TO 15.
NG >> GO TO 14.
14.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.
BBIA0351E
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15.CHECK INTERMITTENT INCIDENT
Refer to GI-35, "How to Check Terminal"
and GI-38, "I INFINITI QX56 2009 Factory Service Manual
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15.CHECK INTERMITTENT INCIDENT
Refer to GI-35, "How to Check Terminal"
and GI-38, "I](/manual-img/42/57031/w960_57031-1575.png)
P0453 EVAP CONTROL SYSTEM PRESSURE SENSOREC-249
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15.CHECK INTERMITTENT INCIDENT
Refer to GI-35, "How to Check Terminal"
and GI-38, "Intermittent Incident".
>> INSPECTION END
Component InspectionINFOID:0000000003771519
EVAP CONTROL SYSTEM PRESSURE SENSOR
1. Remove EVAP control system pr essure sensor with its harness connec tor connected from EVAP canister.
Always replace O-ring with a new one.
2. Install a vacuum pump to EVAP control system pressure sensor.
3. Turn ignition switch ON and check output voltage between ECM terminal 32 and ground under the following conditions.
CAUTION:
Always calibrate the vacuum pu mp gauge when using it.
Do not apply below -93.3 kP a (-700 mmHg, -27.56 inHg) or
pressure over 101.3 kPa (760 mmHg, 29.92 inHg).
4. If NG, replace EVAP control system pressure sensor.
Applied vacuum [kPa (mmHg, inHg)] Voltage (V)
Not applied 1.8 - 4.8
-26.7 (-200, -7.87) 2.1 to 2.5 lower than above value
PBIB1173E
Revision: December 20092009 QX56