2001 INFINITI QX4 Crankshaft position sensor pos

13 DETECT MALFUNCTIONING PART
Check the following.
IHarness connectors E132, E135
IHarness connectors E116, M114
IHarness connectors M32, F23
IHarness for open between harness connector E135 and engine ground
©Repair open circuit or short to power in harness or connectors.
14 CHECK GEAR TOOTH
Visually check for chipping signal plate (flywheel or drive plate) gear tooth (cog).
OK or NG
OK©GO TO 15.
NG©Replace the signal plate (flywheel or drive plate).
15 CHECK INTERMITTENT INCIDENT
Refer to ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-140.
©INSPECTION END
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DTC P1336 CRANKSHAFT POSITION SENSOR (CKPS) (POS) (COG)
Diagnostic Procedure (Cont'd)
EC-525

DescriptionNBEC0319SYSTEM DESCRIPTIONNBEC0319S01
Sensor Input Signal to ECMECM
functionActuator
Crankshaft position sensor (POS) Engine speed (POS signal)
EVAP can-
ister purge
flow controlEVAP canister purge volume
control solenoid valve Crankshaft position sensor (REF) Engine speed (REF signal)
Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Ignition switch Start signal
Throttle position sensor Throttle position
Throttle position switch Closed throttle position
Heated oxygen sensorsDensity of oxygen in exhaust gas
(Mixture ratio feedback signal)
Fuel tank temperature sensor Fuel temperature in fuel tank
Vehicle speed sensor Vehicle speed
This system controls flow rate of fuel vapor from the EVAP canis-
ter. The opening of the vapor by-pass passage in the EVAP canis-
ter 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 consider-
ing 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.
SEF337U
COMPONENT DESCRIPTIONNBEC0319S02The EVAP canister purge volume control solenoid valve uses a
ON/OFF duty to control the flow rate of fuel vapor from the EVAP
canister. 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
Mode
NBEC0320Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
PURG VOL C/VIEngine: After warming up
IAir conditioner switch ªOFFº
IShift lever: ªNº
INo-loadIdle (Vehicle stopped) 0%
2,000 rpm Ð
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DTC P1444 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Description
EC-541

DescriptionNBEC0596SYSTEM DESCRIPTIONNBEC0596S01
Sensor Input Signal to ECMECM func-
tionActuator
Mass air flow sensor Amount of intake air
VIAS con-
trolVIAS control solenoid valve Throttle position sensor Throttle position
Closed throttle position Throttle valve idle position
Ignition switch Start signal
Crankshaft position sensor (POS) Engine speed (POS signal)
Crankshaft position sensor (REF) Engine speed (REF signal)
Engine coolant temperature sensor Engine coolant temperature
SEF447Z
When the engine is running at low or medium speed, the power
valve is fully closed. Under this condition, the effective suction port
length is equivalent to the total length of the intake manifold collec-
tor's suction port including the intake valve. This long suction port
provides increased air intake which results in improved suction
efficiency and higher torque generation.
The surge tank and one-way valve are provided. When engine is
running at high speed, the ECM sends the signal to the VIAS con-
trol solenoid valve. This signal introduces the intake manifold
vacuum into the power valve actuator and therefore opens the
power valve to two suction passages together in the collector.
Under this condition, the effective port length is equivalent to the
length of the suction port provided independently for each cylinder.
This shortened port length results in enhanced engine output with
reduced suction resistance under high speeds.
VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)
Description
EC-610

System DescriptionNBEC0392
Sensor Input Signal to ECMECM func-
tionActuator
Crankshaft position sensor (POS) Engine speed (POS signal)
Fuel pump
controlFuel pump relay Crankshaft position sensor (REF) Engine speed (REF signal)
Ignition switch Start signal
The ECM activates the fuel pump for several seconds after the ignition switch is turned on to improve engine
startability. If the ECM receives a 120É signal from the crankshaft position sensor (REF), it knows that the
engine is rotating, and causes the pump to operate. If the 120É signal is not received when the ignition switch
is on, the engine stalls. The ECM stops pump operation and prevents battery discharging, thereby improving
safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump relay, which in turn
controls the fuel pump.
Condition Fuel pump operation
Ignition switch is turned to ON. Operates for 1 second.
Engine running and cranking Operates.
When engine is stopped Stops in 1.5 seconds.
Except as shown aboveStops.
SEF018S
Component DescriptionNBEC0393The fuel pump with a fuel damper is an in-tank type (the pump and
damper are located in the fuel tank).
CONSULT-II Reference Value in Data Monitor
Mode
NBEC0394Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
FUEL PUMP RLYIIgnition switch is turned to ON. (Operates for 1 second.)
IEngine running and crankingON
Except as shown above OFF
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FUEL PUMP
System Description
EC-625

Throttle Position SensorNBEC0419
Throttle valve conditionsVoltage
(at normal operating temperature,
engine off, ignition switch ON,
throttle opener disengaged)
Completely closed (a)0.15 - 0.85V
Partially openBetween (a) and (b)
Completely open (b)3.5 - 4.7V
Calculated Load ValueNBEC0420
Calculated load value % (Using CONSULT-II or GST)
At idle14.0 - 33.0
At 2,500 rpm12.0 - 25.0
Intake Air Temperature SensorNBEC0421
Temperature ÉC (ÉF) Resistance kW
20 (68)2.1 - 2.9
80 (176)0.27 - 0.38
Heated Oxygen Sensor 2 Heater (Rear)NBEC0422
Resistance [at 25ÉC (77ÉF)]2.3 - 4.3W
Crankshaft Position Sensor (REF)NBEC0423
Resistance [at 20ÉC (68ÉF)]470 - 570W
Fuel Tank Temperature SensorNBEC0424
Temperature ÉC (ÉF) Resistance kW
20 (68)2.3 - 2.7
50 (122)0.79 - 0.90
Camshaft Position Sensor (PHASE)NBEC0639
Resistance [at 20ÉC (68ÉF)]HITACHI make 1,440 - 1,760W
MITSUBISHI make 2,090 - 2,550W
SERVICE DATA AND SPECIFICATIONS (SDS)
Throttle Position Sensor
EC-650

Code Section Wiring Diagram Name
NAVI EL Navigation System
NONDTC AT Non-detectable Items
O2H1B1 EC Heated Oxygen Sensor 1 Heater
(Front) (Bank 1)
O2H1B2 EC Heated Oxygen Sensor 1 Heater
(Front) (Bank 2)
O2H2B1 EC Heated Oxygen Sensor 2 Heater
(Rear) (Bank 1)
O2H2B2 EC Heated Oxygen Sensor 2 Heater
(Rear) (Bank 2)
O2S1B1 EC Heated Oxygen Sensor 1 (Front)
(Bank 1)
O2S1B2 EC Heated Oxygen Sensor 1 (Front)
(Bank 2)
O2S2B1 EC Heated Oxygen Sensor 2 (Rear)
(Bank 1)
O2S2B2 EC Heated Oxygen Sensor 2 (Rear)
(Bank 2)
OVRCSV AT Overrun Clutch Solenoid Valve
P/ANT EL Power Antenna
PGC/V EC EVAP Canister Purge Volume
Control Solenoid Valve
PHASE EC Camshaft Position Sensor
(PHASE)
PNP/SW EC Park/Neutral Position Switch
PNP/SW AT Park/Neutral Position Switch
POS EC Crankshaft Position Sensor
(CKPS) (POS)
POWER EL Power Supply Routing
PRE/SE EC EVAP Control System Pressure
Sensor
PST/SW EC Power Steering Oil Pressure
Switch
REF EC Crankshaft Position Sensor
(CKPS) (REF)
REMOTE EL Audio (Remote Control Switch)
RP/SEN EC Refrigerant Pressure
S/SIG EC Start Signal
S/VCSW EC Swirl Control Valve Control
Vacuum Check Switch
SEAT EL Power Seat
SHIFT AT A/T Shift Lock System
SROOF EL Sunroof
SRS RS Supplemental Restraint SystemCode Section Wiring Diagram Name
SSV/A AT Shift Solenoid Valve A
SSV/B AT Shift Solenoid Valve B
START SC Starting System
STOP/L EL Stop lamp
SWL/V EC Swirl Control Valve Control Sole-
noid Valve
TAIL/L EL Parking, License and Tail Lamps
TCCSIG AT A/T TCC Signal (Lock up)
TCV AT Torque Converter Clutch Solenoid
Valve
T/F TF Transfer
TFTS EC Tank Fuel Temperature Sensor
THEFT EL Theft Warning System
TLID EL Glass Hatch Opener
TP/SW EC Throttle Position Switch
TPS AT Throttle Position Sensor
TPS EC Throttle Position Sensor
TRNSMT EL Integrated HOMELINKYTrans-
mitter
TRSA/T AT Turbine Revolution Sensor
TURN EL Turn Signal and Hazard Warning
Lamps
VIAS/V EC Variable Induction Air Control Sys-
tem
VSS EC Vehicle Speed Sensor
VSSA/T AT Vehicle Speed Sensor A/T (Revo-
lution Sensor)
VSSMTR AT Vehicle Speed Sensor MTR
WARN EL Warning Lamps
WINDOW EL Power Window
WIP/R EL Rear Wiper and Washer
WIPER EL Front Wiper and Washer
WIRING DIAGRAM CODES (CELL CODES)
EL-458

ComponentsNBEM0008
SEM583G
RemovalNBEM0009WARNING:
IPlace vehicle on a flat and solid surface.
IYou should not remove oil pan until exhaust system and
cooling system have completely cooled off.
Otherwise, you may burn yourself and/or fire may break
out in the fuel line.
IWhen removing front engine mounting nuts, lift up slightly
engine for safety work.
CAUTION:
When removing the aluminum oil pan from engine, first
remove the crankshaft position sensors (POS and REF) from
the assembly.
Be careful not to damage sensor edges and signal plate teeth.
1. Remove front RH and LH wheels.
2. Remove battery.
3. Remove oil level gauge.
4. Remove engine undercover.
5. Remove suspension member stay.
6. Drain engine coolant from radiator drain plug.
7. Disconnect A/T oil cooler hoses.
8. Drain engine oil.
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OIL PAN
Components
EM-15

9. Remove the crankshaft position sensors (REF and POS).
10. Remove drive belts and idler pulley with bracket.
11. Remove power steering oil pump, then put it aside holding with
a suitable wire.
12. Remove alternator.
SEM605G
13. Install engine slingers.
14. Remove front propeller shaft. (4WD)
Refer to PD-6, ªRemoval and Installationº.
15. Remove exhaust front tube heat insulators, then remove rear
heat oxygen sensors.
16. Remove exhaust front tube from both sides.
Refer to FE-8, ªRemoval and Installationº.
17. Remove front final drive. (4WD)
Refer to PD-18, ªRemoval and Installationº.
18. Remove starter motor.
19. Disconnect oil pressure switch harness connector.
SEM528G
20. Loosen and disconnect the bolts fixing the steering column
assembly lower joint and the power steering gear.
SEM471G
21. Set a suitable transmission jack under the front suspension
member and hoist engine with engine slingers.
EMQ0357D
22. Remove front engine mounting nuts from both sides.
OIL PAN
Removal (Cont'd)
EM-16