2001 INFINITI QX4 Ac system

NBGI0005
NOTICE:
Trouble diagnoses indicates work procedures required to diagnose
problems effectively. Observe the following instructions before
diagnosing.
1)Before performing trouble diagnoses, read the ªPrelimi-
nary Checkº, the ªSymptom Chartº or the ªWork Flowº.
2)After repairs, re-check that the problem has been com-
pletely eliminated.
3)Refer to Component Parts and Harness Connector Loca-
tion for the Systems described in each section for
identification/location of components and harness con-
nectors.
4)Refer to the Circuit Diagram for quick pinpoint check.
If you need to check circuit continuity between harness
connectors in more detail, such as when a sub-harness is
used, refer to Wiring Diagram in each individual section
and Harness Layout in EL section for identification of har-
ness connectors.
5)When checking circuit continuity, ignition switch should
be OFF.
6)Before checking voltage at connectors, check battery volt-
age.
7)After accomplishing the Diagnostic Procedures and Elec-
trical Components Inspection, make sure that all harness
connectors are reconnected as they were.
HOW TO FOLLOW TROUBLE DIAGNOSIS
GI-34

NBGI0006
Function and System ApplicationNBGI0006S01
Diagnostic
test modeFunction ENGINEALL-
MODE
4WDA/T ABSAIR
BAGIVCS*1IVIS
(NATS)*2SMART
EN-
TRANCE
Work sup-
portThis mode enables a
technician to adjust some
devices faster and more
accurate by following the
indications on CONSULT-
II.x x ÐÐÐÐÐÐ
Self-diag-
nostic
resultsSelf-diagnostic results
can be read and erased
quickly.xxxxxxxÐ
Trouble
diagnostic
recordCurrent self-diagnostic
results and all trouble
diagnostic records previ-
ously stored can be read.ÐÐÐÐ x ÐÐÐ
ECU dis-
criminated
No.Classification number of
a replacement ECU can
be read to prevent an
incorrect ECU from being
installed.ÐÐÐÐ x ÐÐÐ
Data monitorInput/Output data in the
ECU (ECM) can be read.x x x xÐxÐÐ
Data monitor
(Spec.)The specified values will
be displayed when an
OK/NG jugement is diffi-
cult for the DATA MONI-
TOR items by Barchart
and Line Graph.x ÐÐÐÐÐÐÐ
DTC work
supportThis mode enables a
technician to set operat-
ing conditions to confirm
self-diagnosis status/
results.ÐÐ x ÐÐÐÐÐ
Active testDiagnostic Test Mode in
which CONSULT-II drives
some actuators apart
from the ECMs and also
shifts some parameters
in a specified range.x ÐÐ x ÐÐÐÐ
ECU (ECM)
part numberECU (ECM) part number
can be read.x x x xÐxÐÐ
Control unit
initializationAll registered ignition key
IDs in NATS components
can be initialized and
new IDs can be regis-
tered.ÐÐÐÐÐÐ x Ð
SRT & DTC
confirmationThe results of SRT (Sys-
tem Readiness Test) and
the self-diagnosis status/
results can be confirmed.x ÐÐÐÐÐÐÐ
Function
checkªRemote door unlock
functionº of IVCS system
can be checked in this
mode.ÐÐÐÐÐ x ÐÐ
CONSULT-II CHECKING SYSTEM
Function and System Application
GI-38

Diagnostic
test modeFunction ENGINEALL-
MODE
4WDA/T ABSAIR
BAGIVCS*1IVIS
(NATS)*2SMART
EN-
TRANCE
Registered
dataDisplay the VIN, etc. data
registered in the IVCS
unit.ÐÐÐÐÐ x ÐÐ
Configura-
tionIThe IVCS system can
be set up in the dem-
onstration mode to
confirm system opera-
tion.
IVarious data related to
both the Communica-
tor Response Center
contract and cellular
provider can be
written/rewritten in this
mode.ÐÐÐÐÐ x ÐÐ
REMO
CONT ID
SET UPA maximum of four IDs
(identifications) can be
registered in the memory
using the remote control-
ler. These IDs can be
also be confirmed and
erased as required.ÐÐÐÐÐÐÐ x
x: Applicable
*1: INFINITI Communicator (IVCS)
*2: IVIS (NATS) [INFINITI Vehicle Immobilizer System (Nissan Anti-Theft System)]
Nickel Metal Hydride Battery ReplacementNBGI0006S06CONSULT-II contains a nickel metal hydride battery. When replacing the battery obey the following:
WARNING:
Replace the nickel metal hydride battery with Genuine CONSULT-II battery only. Use of another bat-
tery may present a risk of fire or explosion. The battery may present a fire or chemical burn hazard if
mistreated. Do not recharge, disassemble of dispose of in fire.
Keep the battery out of reach of children and discard used battery conforming to the local regulations.
Checking EquipmentNBGI0006S07When ordering the below equipment, contact your NISSAN/INFINITI distributor.
Tool name Description
NISSAN CONSULT-II
q
1CONSULT-II unit (Tester internal soft:
Resident version 3.2.0) and accessories
q
2Program card AED99C (Version 3.0)
and UEN99A (For IVIS and IVCS)
To confirm the best combination of these
softwares, refer to CONSULT-II Operation
Manual.
SGI100A
NOTE:
IThe CONSULT-II must be used in conjunction with a program card.
CONSULT-II does not require loading (Initialization) procedure.
IBe sure the CONSULT-II is turned off before installing or removing a program card.
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
CONSULT-II CHECKING SYSTEM
Function and System Application (Cont'd)
GI-39

CONSULT-II Data Link Connector (DLC) Circuit=NBGI0006S08
SOM395
INSPECTION PROCEDURENBGI0006S0801If the CONSULT-II cannot diagnose the system properly, check the following items.
Symptom Check item
CONSULT-II cannot access any
system.ICONSULT-II DLC power supply circuit (Terminal 8) and ground circuit (Terminal 4)
(For detailed circuit, refer to EC-648, ªMIL & DATA LINK CONNECTORSº.)
ICONSULT-II (DDL) cable
CONSULT-II cannot access indi-
vidual system. (Other systems
can be accessed.)ICONSULT-II program card (Check the approprite CONSULT-II program card for the system.
Refer to GI-39.)
IPower supply and ground circuit for the control unite of the system
(For detailed circuit, refer to wiring diagram for each system.)
IOpen or short circuit between the system and CONSULT-II DLC
(For detailed circuit, refer to wiring diagram for each system.)
CONSULT-II CHECKING SYSTEM
CONSULT-II Data Link Connector (DLC) Circuit
GI-40

2-pole Lift=NBGI0008S03WARNING:
When lifting the vehicle, open the lift arms as wide as possible
and ensure that the front and rear of the vehicle are well bal-
anced.
When setting the lift arm, do not allow the arm to contact the
brake tubes, brake cable and fuel lines.
SGI133A
SGI988
Tow Truck TowingNBGI0008S04CAUTION:
IAll applicable state or Provincial (in Canada) laws and
local laws regarding the towing operation must be
obeyed.
IIt is necessary to use proper towing equipment to avoid
possible damage to the vehicle during towing operation.
Towing is in accordance with Towing Procedure Manual at
dealer.
IAlways attach safety chains before towing.
IWhen towing, make sure that the transmission, steering
system and power train are in good order. If any unit is
damaged, dollies must be used.
INever tow an automatic transmission model from the rear
(that is backward) with four wheels on the ground as this
may cause serious and expensive damage to the trans-
mission.
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
LIFTING POINTS AND TOW TRUCK TOWING
2-pole Lift
GI-47

NBGI0010
SAE J1930 Terminology ListNBGI0010S01All emission related terms used in this publication in accordance with SAE J1930 are listed. Accordingly, new
terms, new acronyms/abbreviations and old terms are listed in the following chart.
NEW TERMNEW ACRONYM /
ABBREVIATIONOLD TERM
Air cleaner ACL Air cleaner
Barometric pressure BARO ***
Barometric pressure sensor-BCDD BAROS-BCDD BCDD
Camshaft position CMP ***
Camshaft position sensor CMPS Crank angle sensor
Canister *** Canister
Carburetor CARB Carburetor
Charge air cooler CAC Intercooler
Closed loop CL Closed loop
Closed throttle position switch CTP switch Idle switch
Clutch pedal position switch CPP switch Clutch switch
Continuous fuel injection system CFI system ***
Continuous trap oxidizer system CTOX system ***
Crankshaft position CKP ***
Crankshaft position sensor CKPS ***
Data link connector DLC ***
Diagnostic test mode DTM Diagnostic mode
Diagnostic test mode selector DTM selector Diagnostic mode selector
Diagnostic test mode I DTM I Mode I
Diagnostic test mode II DTM II Mode II
Diagnostic trouble code DTC Malfunction code
Direct fuel injection system DFI system ***
Distributor ignition system DI system Ignition timing control
Early fuel evaporation-mixture heater EFE-mixture heater Mixture heater
Early fuel evaporation system EFE system Mixture heater control
Electrically erasable programmable read
only memoryEEPROM ***
Electronic ignition system EI system Ignition timing control
Engine control EC ***
Engine control module ECM ECCS control unit
Engine coolant temperature ECT Engine temperature
Engine coolant temperature sensor ECTS Engine temperature sensor
Engine modification EM ***
Engine speed RPM Engine speed
Erasable programmable read only
memoryEPROM ***MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
SAE J1930 TERMINOLOGY LIST
SAE J1930 Terminology List
GI-51

NEW TERMNEW ACRONYM /
ABBREVIATIONOLD TERM
Evaporative emission canister EVAP canister Canister
Evaporative emission system EVAP system Canister control solenoid valve
Exhaust gas recirculation valve EGR valve EGR valve
Exhaust gas recirculation control-BPT
valveEGRC-BPT valve BPT valve
Exhaust gas recirculation control-solenoid
valveEGRC-solenoid valve EGR control solenoid valve
Exhaust gas recirculation temperature
sensorEGRT sensor Exhaust gas temperature sensor
EGR temperature sensor
Flash electrically erasable programmable
read only memoryFEEPROM ***
Flash erasable programmable read only
memoryFEPROM ***
Flexible fuel sensor FFS ***
Flexible fuel system FF system ***
Fuel pressure regulator *** Pressure regulator
Fuel pressure regulator control solenoid
valve*** PRVR control solenoid valve
Fuel tank temperature sensor FTT sensor Tank fuel temperature sensor
Fuel trim FT ***
Heated Oxygen sensor HO2S Exhaust gas sensor
Idle air control system IAC system Idle speed control
Idle air control valve-air regulator IACV-air regulator Air regulator
Idle air control valve-auxiliary air control
valveIACV-AAC valve Auxiliary air control (AAC) valve
Idle air control valve-FICD solenoid valve IACV-FICD solenoid valve FICD solenoid valve
Idle air control valve-idle up control sole-
noid valveIACV-idle up control solenoid valve Idle up control solenoid valve
Idle speed control-FI pot ISC-FI pot FI pot
Idle speed control system ISC system ***
Ignition control IC ***
Ignition control module ICM ***
Indirect fuel injection system IFI system ***
Intake air IA Air
Intake air temperature sensor IAT sensor Air temperature sensor
Knock *** Detonation
Knock sensor KS Detonation sensor
Malfunction indicator lamp MIL Check engine light
Manifold absolute pressure MAP ***
Manifold absolute pressure sensor MAPS ***
SAE J1930 TERMINOLOGY LIST
SAE J1930 Terminology List (Cont'd)
GI-52

NEW TERMNEW ACRONYM /
ABBREVIATIONOLD TERM
Manifold differential pressure MDP ***
Manifold differential pressure sensor MDPS ***
Manifold surface temperature MST ***
Manifold surface temperature sensor MSTS ***
Manifold vacuum zone MVZ ***
Manifold vacuum zone sensor MVZS ***
Mass air flow sensor MAFS Air flow meter
Mixture control solenoid valve MC solenoid valve Air-fuel ratio control solenoid valve
Multiport fuel injection System MFI system Fuel injection control
Neutral position switch *** Neutral switch
Nonvolatile random access memory NVRAM ***
On board diagnostic system OBD system Self-diagnosis
Open loop OL Open loop
Oxidation catalyst OC Catalyst
Oxidation catalytic converter system OC system ***
Oxygen sensor O2S Exhaust gas sensor
Park position switch *** Park switch
Park/neutral position switch PNP switch Park/neutral switch
Periodic trap oxidizer system PTOX system ***
Positive crankcase ventilation PCV Positive crankcase ventilation
Positive crankcase ventilation valve PCV valve PCV valve
Powertrain control module PCM ***
Programmable read only memory PROM ***
Pulsed secondary air injection control
solenoid valvePAIRC solenoid valve AIV control solenoid valve
Pulsed secondary air injection system PAIR system Air induction valve (AIV) control
Pulsed secondary air injection valve PAIR valve Air induction valve
Random access memory RAM ***
Read only memory ROM ***
Scan tool ST ***
Secondary air injection pump AIR pump ***
Secondary air injection system AIR system ***
Sequential multiport fuel injection system SFI system Sequential fuel injection
Service reminder indicator SRI ***
Simultaneous multiport fuel injection sys-
tem*** Simultaneous fuel injection
Smoke puff limiter system SPL system ***
Supercharger SC ***
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
SAE J1930 TERMINOLOGY LIST
SAE J1930 Terminology List (Cont'd)
GI-53