2001 INFINITI QX4 transmission

NBGI0004
Work FlowNBGI0004S01
SGI838
STEP DESCRIPTION
STEP 1 Get detailed information about the conditions and the environment when the incident occurred.
The following are key pieces of information required to make a good analysis:
WHATVehicle Model, Engine, Transmission and the System (i.e. Radio).
WHENDate, Time of Day, Weather Conditions, Frequency.
WHERERoad Conditions, Altitude and Traffic Situation.
HOWSystem Symptoms, Operating Conditions (Other Components Interaction).
Service History and if any After Market Accessories have been installed.
STEP 2 Operate the system, road test if necessary.
Verify the parameter of the incident.
If the problem can not be duplicated, refer to ªIncident Simulation Testsº next page.
STEP 3 Get the proper diagnosis materials together including:
POWER SUPPLY ROUTING
System Operation Descriptions
Applicable Service Manual Sections
Check for any Service Bulletin.
Identify where to begin diagnosis based upon your knowledge of the system operation and the cus-
tomer comments.
STEP 4 Inspect the system for mechanical binding, loose connectors or wiring damage.
Determine which circuits and components are involved and diagnose using the Power Supply Routing
and Harness Layouts.
STEP 5 Repair or replace the incident circuit or component.
STEP 6 Operate the system in all modes. Verify the system works properly under all conditions. Make sure you
have not inadvertently created a new incident during your diagnosis or repair steps.
HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENT
Work Flow
GI-24

NBGI0007
Model VariationNBGI0007S01
Destination Body GradeEngine VQ35DE
Transmission RE4R01A (Automatic)
Differential carrierFront R200A
(4WD only)Rear H233B
Transfer ATX14A
U.S.A.
Wide LE 4-door2WD JLJULVAR50EUA
4WDJLJWLVAR50EUA
CanadaJLJWLVAR50ENA
PREFIX AND SUFFIX DESIGNATIONSNBGI0007S0101
SGI995-B
Identification NumberNBGI0007S02
SGI948-A
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IDENTIFICATION INFORMATION
Model Variation
GI-41

SGI136A
ENGINE SERIAL NUMBERNBGI0007S0203
MGI042A
AUTOMATIC TRANSMISSION NUMBERNBGI0007S0204
MGI043A
TRANSFER SERIAL NUMBERNBGI0007S0205
DimensionsNBGI0007S03Unit: mm (in)
Wagon
VQ35DE
Overall length 4,650 (183.1)
Overall width 1,840 (72.4)
Overall height1,730 (68.1)
1,795 (70.7)*
Front tread 1,540 (60.6)
Rear tread 1,545 (60.8)
Wheelbase 2,700 (106.3)
*: With luggage rack
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IDENTIFICATION INFORMATION
Identification Number (Cont'd)
GI-43

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.
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LIFTING POINTS AND TOW TRUCK TOWING
2-pole Lift
GI-47

SGI989
2WD MODELSNBGI0008S0402INFINITI recommends that vehicle be towed with the driving (rear)
wheels off the ground as illustrated.
CAUTION:
IWhen towing manual or automatic transmission models
with the front wheels on the ground: Turn the ignition key
to the OFF position and secure the steering wheel in a
straightahead position with a rope or similar device. Never
place the ignition key in the LOCK position. This will result
in damage to the steering lock mechanism.
IWhen towing manual transmission models with the rear
wheels on the ground or four wheels on the ground (if you
do not use towing dollies): Always release the parking
brake and move the transmission shift lever to the N (neu-
tral) position.
Observe the following restricted towing speeds and distances.
Manual transmission models:
ISpeed: Below 95 km/h (60 MPH)
IDistance: Less than 800 km (500 miles)
If the speed or distance must necessarily be greater, remove the
propeller shaft beforehand to prevent damage to the transmission.
SGI950
4WD MODELSNBGI0008S0403INFINITI recommends that a dolly or a flat bed truck be used as
illustrated when towing all-mode 4WD models.
LIFTING POINTS AND TOW TRUCK TOWING
Tow Truck Towing (Cont'd)
GI-48

NEW TERMNEW ACRONYM /
ABBREVIATIONOLD TERM
Supercharger bypass SCB ***
System readiness test SRT ***
Thermal vacuum valve TVV Thermal vacuum valve
Three way catalyst TWC Catalyst
Three way catalytic converter system TWC system ***
Three way + oxidation catalyst TWC + OC Catalyst
Three way + oxidation catalytic converter
systemTWC + OC system ***
Throttle body TB Throttle chamber
SPI body
Throttle body fuel injection system TBI system Fuel injection control
Throttle position TP Throttle position
Throttle position sensor TPS Throttle sensor
Throttle position switch TP switch Throttle switch
Torque converter clutch solenoid valve TCC solenoid valve Lock-up cancel solenoid
Lock-up solenoid
Transmission control module TCM A/T control unit
Turbocharger TC Turbocharger
Vehicle speed sensor VSS Vehicle speed sensor
Volume air flow sensor VAFS Air flow meter
Warm up oxidation catalyst WU-OC Catalyst
Warm up oxidation catalytic converter sys-
temWU-OC system ***
Warm up three way catalyst WU-TWC Catalyst
Warm up three way catalytic converter
systemWU-TWC system ***
Wide open throttle position switch WOTP switch Full switch
SAE J1930 TERMINOLOGY LIST
SAE J1930 Terminology List (Cont'd)
GI-54

IntroductionNBHA0013AIR CONDITIONER LAN SYSTEM OVERVIEW CONTROL SYSTEMNBHA0013S01The LAN system consists of auto amp., air mix door motor and mode door motor.
A configuration of these components is shown in the diagram below.
RHA439G
FeaturesNBHA0014SYSTEM CONSTRUCTION (LAN)NBHA0014S08A small network is constructed between the auto amplifier, air mix door motor and mode door motor. The auto
amplifier and motors are connected by data transmission lines and motor power supply lines. The LAN net-
work is built through the ground circuits of the two motors.
Addresses, motor opening angle signals, motor stop signals and error checking messages are all transmitted
through the data transmission lines connecting the auto amplifier and two motors.
The following functions are contained in LCUs built into the air mix door motor and the mode door motor.
IAddress
IMotor opening angle signals
IData transmission
IMotor stop and drive decision
IOpening angle sensor (PBR function)
IComparison
IDecision (Auto amplifier indicated value and motor opening angle comparison)
RHA440GA
OperationNBHA0014S0801The auto amplifier receives data from each of the sensors. The amplifier sends air mix door and mode door
opening angle data to the air mix door motor LCU and mode door motor LCU.
The air mix door motor and mode door motor read their respective signals according to the address signal.
Opening angle indication signals received from the auto amplifier and each of the motor position sensors are
compared by the LCUs in each motor with the existing decision and opening angles. Subsequently, HOT/
COLD or DEFROST/VENT operation is selected. The new selection data is returned to the auto amplifier.
DESCRIPTION
Introduction
HA-20

RHA441GA
Transmission Data and Transmission OrderNBHA0014S0802Amplifier data is transmitted consecutively to each of the door motors following the form shown in figure below.
Start: Initial compulsory signal sent to each of the door motors.
Address: Data sent from the auto amplifier is selected according to data-based decisions made by the air mix
door motor and mode door motor.
If the addresses are identical, the opening angle data and error check signals are received by the door motor
LCUs. The LCUs then make the appropriate error decision. If the opening angle data is normal, door control
begins.
If an error exists, the received data is rejected and corrected data received. Finally, door control is based upon
the corrected opening angle data.
Opening angle: Data that shows the indicated door opening angle of each door motor.
Error check: Procedure by which sent and received data is checked for errors. Error data is then compiled.
The error check prevents corrupted data from being used by the air mix door motor and mode door motor.
Error data can be related to the following problems.
IAbnormal electrical frequency
IPoor electrical connections
ISignal leakage from transmission lines
ISignal level fluctuation
Stop signal: At the end of each transmission, a stop operation, in-operation, or internal problem message is
delivered to the auto amplifier. This completes one data transmission and control cycle.
RHA442G
Air Mix Door Control (Automatic Temperature Control)NBHA0014S0803The air mix door is automatically controlled so that in-vehicle temperature is maintained at a predetermined
value by: The temperature setting, ambient temperature, in-vehicle temperature and amount of sunload.
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DESCRIPTION
Features (Cont'd)
HA-21