2001 INFINITI QX4 IDX

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Page 550 of 2395

INFINITI QX4 2001  Factory Service Manual Engine Fuel & Emission Control SystemNBEC0004
SEF952RE
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PRECAUTIONS
Engine Fuel & Emission Control System
EC-15

Page 552 of 2395

INFINITI QX4 2001  Factory Service Manual SEF348N
IWhen measuring ECM signals with a circuit tester, never
allow the two tester probes to contact.
Accidental contact of probes will cause a short circuit and
damage the ECM power transistor.
ID

Page 554 of 2395

INFINITI QX4 2001  Factory Service Manual Tool name
(Kent-Moore No.)Description
Socket wrench
NT705
Removing and installing engine coolant tempera-
ture sensor
Oxygen sensor thread
cleaner
(J-43897-18)
(J-43897-12)
NT828
Reconditioning the ex

Page 556 of 2395

INFINITI QX4 2001  Factory Service Manual SEF034Z
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ENGINE AND EMISSION CONTROL OVERALL SYSTEM
Engine Control Component Parts Location (Contd)
EC-21

Page 558 of 2395

INFINITI QX4 2001  Factory Service Manual SEF036Z
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IDX
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
Engine Control Component Parts Location (Contd)
EC-23

Page 560 of 2395

INFINITI QX4 2001  Factory Service Manual System DiagramNBEC0011
SEF930Y
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ENGINE AND EMISSION CONTROL OVERALL SYSTEM
System Diagram
EC-25

Page 562 of 2395

INFINITI QX4 2001  Factory Service Manual System ChartNBEC0013
Input (Sensor) ECM Function Output (Actuator)
ICamshaft position sensor (PHASE)
ICrankshaft position sensor (REF)
IMass air flow sensor
IEngine coolant temperature sensor
IHeated

Page 564 of 2395

INFINITI QX4 2001  Factory Service Manual Mixture Ratio Feedback Control (Closed loop control)NBEC0014S04
SEF336WA
The mixture ratio feedback system provides the best air-fuel mixture ratio for driveability and emission con-
trol. The warm-up