2004 INFINITI QX56 Factory Service Manual

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Page 1681 of 3371

INFINITI QX56 2004 Factory Service Manual EC-490Revision: August 2007
DTC P1279, P1289 A/F SENSOR 1
2004 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals

Page 1682 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1279, P1289 A/F SENSOR 1
EC-491
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Revision: August 20072004 QX56
3. CHECK EXHAUST GAS LEAK
1. Start engine and run it at idle.
2. Listen for an exhaust gas leak before thr

Page 1683 of 3371

INFINITI QX56 2004 Factory Service Manual EC-492Revision: August 2007
DTC P1279, P1289 A/F SENSOR 1
2004 QX56
5. CLEAR THE SELF-LEARNING DATA
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Select “SELF-L

Page 1684 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1279, P1289 A/F SENSOR 1
EC-493
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Revision: August 20072004 QX56
6. CHECK A/F SENSOR 1 POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness

Page 1685 of 3371

INFINITI QX56 2004 Factory Service Manual EC-494Revision: August 2007
DTC P1279, P1289 A/F SENSOR 1
2004 QX56
8. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. C

Page 1686 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1279, P1289 A/F SENSOR 1
EC-495
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Revision: August 20072004 QX56
11 . CHECK PCV VALVE
Refer to EC-645, "
POSITIVE CRANKCASE VENTILATION" .
OK or NG
OK >> GO TO 12.
NG >>

Page 1687 of 3371

INFINITI QX56 2004 Factory Service Manual EC-496Revision: August 2007
DTC P1444 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
2004 QX56
DTC P1444 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
PFP:14920
DescriptionUBS00HAT
SYSTEM DESCR

EC-496Revision: August 2007
DTC P1444 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
2004 QX56
DTC P1444 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
PFP:14920
DescriptionUBS00HAT
SYSTEM DESCRIPTION
*1: ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to the ECM through CAN communication line.
This system controls flow rate of fuel vapor from the EVAP canister. The opening of the vapor by-pass pas-
sage in the EVAP canister purge volume control solenoid valve changes to control the flow rate. The EVAP
canister purge volume control solenoid valve repeats ON/OFF operation according to the signal sent from the
ECM. The opening of the valve varies for optimum engine control. The optimum value stored in the ECM is
determined by considering various engine conditions. When the engine is operating, the flow rate of fuel vapor
from the EVAP canister is regulated as the air flow changes.
COMPONENT DESCRIPTION
The EVAP canister purge volume control solenoid valve uses a ON/
OFF duty to control the flow rate of fuel vapor from the EVAP canis-
ter. The EVAP canister purge volume control solenoid valve is
moved by ON/OFF pulses from the ECM. The longer the ON pulse,
the greater the amount of fuel vapor that will flow through the valve.
CONSULT-II Reference Value in Data Monitor ModeUBS00HAU
Specification data are reference values.
Sensor Input signal to ECM ECM function Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)Engine speed*
1
EVAP canister
purge flow controlEVAP canister purge vol-
ume control solenoid valve Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Battery
Battery voltage*
1
Throttle position sensor Throttle position
Accelerator pedal position sensor Accelerator pedal position
A/F sensor 1Density of oxygen in exhaust gas
(Mixture ratio feedback signal)
Fuel tank temperature sensor Fuel temperature in fuel tank
Wheel sensor*
2Vehicle speed
PBIB2057E
MONITOR ITEM CONDITION SPECIFICATION
PURG VOL C/V
Engine: After warming up
Air conditioner switch: OFF
Shift lever: N
No loadIdle
(Accelerator pedal is not depressed
even slightly, after starting engine)0%
2,000 rpm —

Page 1688 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1444 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
EC-497
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Revision: August 20072004 QX56
On Board Diagnosis LogicUBS00HAV
DTC Confirmation ProcedureUBS00HAW
NOTE:
If

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