2001 NISSAN X-TRAIL AUX

GI-46
TERMINOLOGY
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 sen-
sor
EGRT 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 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 ***
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 controlNEW TERMNEW ACRONYM /
ABBREVIATIONOLD TERM

OVERALL SYSTEM
AT-29
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TCM FUNCTION
The function of the TCM is to:
●Receive input signals sent from various switches and sensors.
●Determine required line pressure, shifting point, lock-up operation, and engine brake operation.
●Send required output signals to the respective solenoids.
INPUT/OUTPUT SIGNAL OF TCM
Control MechanismECS004QF
LINE PRESSURE CONTROL
TCM has various line pressure control characteristics to match the driving conditions.
An ON-OFF duty signal is sent to the line pressure solenoid valve based on TCM characteristics.
Hydraulic pressure on the clutch and brake is electronically controlled through the line pressure solenoid valve
to accommodate engine torque. This results in smooth shift operation.
Normal Control
The line pressure to throttle opening characteristics is set for suitable
clutch operation.
Sensors, switches and solenoid
valvesFunction
InputPNP switch Detects select lever position and sends a signal to TCM.
Accelerator pedal position (APP)
sensorDetects accelerator pedal position sensor as throttle position signal and sends
a signal from ECM to TCM.
Closed throttle position signalDetects throttle valve's fully-closed position and sends a signal from ECM to
TCM.
Wide open throttle position signalDetects a throttle valve position of greater than 1/2 of full throttle and sends a
signal from ECM to TCM.
Engine speed signal From ECM.
A/T fluid temperature sensor Detects transmission fluid temperature and sends a signal to TCM.
Revolution sensor Detects output shaft rpm and sends a signal to TCM.
Vehicle speed sensorUsed as an auxiliary vehicle speed sensor. Sends a signal when revolution
sensor (installed on transmission) malfunctions.
Overdrive control switchSends a signal, which prohibits a shift to “D
4 ” (overdrive) position, to the
TCM.
Stop lamp switch Releases lock-up system when depressing pedal in lock-up condition.
OutputShift solenoid valve A/BSelects shifting point suited to driving conditions in relation to a signal sent
from TCM.
Line pressure solenoid valveRegulates (or decreases) line pressure suited to driving conditions in relation
to a signal sent from TCM.
Torque converter clutch solenoid
valveRegulates (or decreases) lock-up pressure suited to driving conditions in rela-
tion to a signal sent from TCM.
Overrun clutch solenoid valveControls an “engine brake” effect suited to driving conditions in relation to a
signal sent from TCM.
O/D OFF indicator lamp Shows TCM faults when A/T control components malfunction.
SAT003J

DTC VEHICLE SPEED SENSOR MTR
AT-199
[EURO-OBD]
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DTC VEHICLE SPEED SENSOR MTRPFP:24814
DescriptionECS004SM
The vehicle speed sensor·MTR is built into the speedometer assem-
bly. The sensor functions as an auxiliary device to the revolution sen-
sor when it is malfunctioning. The TCM will then use a signal sent
from the vehicle speed sensor·MTR.
TCM TERMINALS AND REFERENCE VALUE
Remarks: Specification data are reference values.
ON BOARD DIAGNOSIS LOGIC
SCIA0716E
Te r m i -
nal No.Wire color Item ConditionJudgement stan-
dard
(Approx.)
40 L/BVehicle speed
sensorWhen moving vehicle at 2 to 3 km/h
(1 to 2 MPH) for 1 m (3 ft) or more.Voltage varies
between less
than 1V and
more than 4.5V
Diagnostic trouble code Malfunction is detected when... Check items (Possible cause)
: VHCL SPEED SEN·MTR
TCM does not receive the proper voltage
signal from the sensor.
●Harness or connectors
(The sensor circuit is open or shorted.)
●Combination meter
●4WD/ABS control unit : 2nd judgement flicker

AT-358
[ALL]
DTC VEHICLE SPEED SENSOR MTR
DTC VEHICLE SPEED SENSOR MTR
PFP:24814
DescriptionECS004TM
The vehicle speed sensor·MTR is built into the speedometer assem-
bly. The sensor functions as an auxiliary device to the revolution sen-
sor when it is malfunctioning. The TCM will then use a signal sent
from the vehicle speed sensor·MTR.
TCM TERMINALS AND REFERENCE VALUE
Remarks: Specification data are reference values.
ON BOARD DIAGNOSIS LOGIC
SELF-DIAGNOSIS CODE CONFIRMATION PROCEDURE
After the repair, perform the following procedure to confirm the malfunction is eliminated.
With CONSULT-II
1. Start engine.
2. Select “SELF-DIAG RESULTS” mode for A/T with CONSULT-II.
3. Drive vehicle under the following conditions:
Selector lever in “D” position and vehicle speed higher than 20
km/h (12 MPH).
SCIA0716E
Te r m i -
nal No.Wire color Item ConditionJudgement stan-
dard
(Approx.)
40 L/BVehicle speed
sensorWhen moving vehicle at 2 to 3 km/h
(1 to 2 MPH) for 1 m (3 ft) or more.Voltage varies
between less
than 0V and
more than 4.5V
Diagnostic trouble code Malfunction is detected when... Check items (Possible cause)
: VHCL SPEED SEN·MTR
TCM does not receive the proper voltage
signal from the sensor.
●Harness or connectors
(The sensor circuit is open or shorted.)
●Combination meter
●4WD/ABS control unit : 2nd judgement flicker
SAT014K

ATC-2
DEFROSTER (DEF) SWITCH ............................. 30
MODE SWITCH ................................................... 30
FAN SWITCH ...................................................... 30
OFF SWITCH ...................................................... 30
FRESH (FRE) SWITCH ....................................... 30
RECIRCULATION (REC) SWITCH ..................... 30
Discharge Air Flow ................................................. 31
System Description ................................................. 32
SWITCHES AND THEIR CONTROL FUNCTION ... 32
TROUBLE DIAGNOSIS ............................................ 33
How to Perform Trouble Diagnoses for Quick and
Accurate Repair ...................................................... 33
WORK FLOW ...................................................... 33
SYMPTOM TABLE .............................................. 33
Component Parts and Harness Connector Location ... 34
ENGINE COMPARTMENT .................................. 34
PASSENGER COMPARTMENT .......................... 35
Circuit Diagram ....................................................... 36
WITH GASOLINE ENGINE ................................. 36
WITH DIESEL ENGINE ....................................... 37
Wiring Diagram ....................................................... 38
WITH GASOLINE ENGINE ................................. 38
WITH DIESEL ENGINE ....................................... 41
Auto Amp. Terminals and Reference Value ............ 44
PIN CONNECTOR TERMINAL LAYOUT ............ 44
AUTO AMP. INSPECTION TABLE ...................... 44
Self-diagnosis Function .......................................... 46
DESCRIPTION .................................................... 46
PROCEDURE ...................................................... 47
AUXILIARY MECHANISM: TEMPERATURE
SETTING TRIMMER ........................................... 52
AUXILIARY MECHANISM: FOOT POSITION
SETTING TRIMMER ........................................... 53
AUXILIARY MECHANISM: INLET PORT MEM-
ORY FUNCTION (FOR LHD MODELS) .............. 54
Operational Check .................................................. 54
CHECKING MEMORY FUNCTION ..................... 54
CHECKING BLOWER ......................................... 55
CHECKING DISCHARGE AIR ............................ 55
CHECKING RECIRCULATION ............................ 55
CHECKING TEMPERATURE DECREASE ......... 56
CHECKING TEMPERATURE INCREASE .......... 56
CHECKING AUTO MODE ................................... 56
Power Supply and Ground Circuit for Auto Amp. ... 57
INSPECTION FLOW ........................................... 57
COMPONENT DESCRIPTION ............................ 57
DIAGNOSTIC PROCEDURE .............................. 58
LAN System Circuit ............................................. ... 59
DIAGNOSTIC PROCEDURE .............................. 59
Mode Door Motor Circuit ........................................ 62
INSPECTION FLOW ........................................
... 62
SYSTEM DESCRIPTION .................................... 63
COMPONENT DESCRIPTION ............................ 64
DIAGNOSTIC PROCEDURE .............................. 64
Air Mix Door Motor Circuit ...................................... 64
INSPECTION FLOW ........................................... 65
SYSTEM DESCRIPTION .................................... 66
COMPONENT DESCRIPTION ............................ 66
DIAGNOSTIC PROCEDURE .............................. 67Intake Door Motor Circuit ........................................ 68
INSPECTION FLOW ............................................ 68
SYSTEM DESCRIPTION ..................................... 69
COMPONENT DESCRIPTION ............................ 69
DIAGNOSTIC PROCEDURE ............................... 70
Blower Motor Circuit ................................................ 70
INSPECTION FLOW ............................................ 71
SYSTEM DESCRIPTION ..................................... 72
COMPONENT DESCRIPTION ............................ 74
DIAGNOSTIC PROCEDURE ............................... 74
COMPONENT INSPECTION ............................... 77
Magnet Clutch Circuit .............................................. 78
INSPECTION FLOW ............................................ 78
SYSTEM DESCRIPTION ..................................... 79
DIAGNOSTIC PROCEDURE ............................... 79
COMPONENT INSPECTION ............................... 84
Insufficient Cooling .................................................. 86
INSPECTION FLOW ............................................ 86
PERFORMANCE TEST DIAGNOSES ................ 88
PERFORMANCE CHART .................................... 90
TROUBLE DIAGNOSES FOR UNUSUAL PRES-
SURE ................................................................... 92
Insufficient Heating ................................................. 95
INSPECTION FLOW ............................................ 95
Noise ....................................................................... 97
INSPECTION FLOW ............................................ 97
Self-diagnosis ......................................................... 98
INSPECTION FLOW ............................................ 98
Memory Function .................................................... 99
INSPECTION FLOW ............................................ 99
Ambient Sensor Circuit .........................................100
COMPONENT DESCRIPTION ..........................100
AMBIENT TEMPERATURE INPUT PROCESS .100
DIAGNOSTIC PROCEDURE .............................100
COMPONENT INSPECTION .............................102
In-vehicle Sensor Circuit .......................................102
COMPONENT DESCRIPTION ..........................102
DIAGNOSTIC PROCEDURE .............................103
COMPONENT INSPECTION .............................104
Sunload Sensor Circuit .........................................105
COMPONENT DESCRIPTION ..........................105
SUNLOAD INPUT PROCESS ...........................105
DIAGNOSTIC PROCEDURE .............................105
COMPONENT INSPECTION .............................107
Intake Sensor Circuit .............................................108
COMPONENT DESCRIPTION ..........................108
DIAGNOSTIC PROCEDURE .............................108
CONTROLLER ........................................................ 111
Removal and Installation .......................................111
Disassembly and Assembly ..................................111
AMBIENT SENSOR ................................................112
Removal and Installation .......................................112
IN-VEHICLE SENSOR ............................................113
Removal and Installation .......................................113
SUNLOAD SENSOR ...............................................114
Removal and Installation .......................................114
INTAKE SENSOR CIRCUIT ....................................115
Removal and Installation .......................................115
BLOWER UNIT ........................................................116

ATC-46
TROUBLE DIAGNOSIS
Self-diagnosis Function
EJS001GX
DESCRIPTION
The self-diagnostic system diagnoses sensors, door motors, blower motor, etc. by system line. Refer to appli-
cable sections (items) for details. Shifting from normal control to the self-diagnostic system is accomplished by
starting the engine (turning the ignition switch from OFF to ON) and pressing OFF switch for at least 5 sec-
onds. The "OFF" switch must be pressed within 10 seconds after starting the engine (ignition switch is turned
ON). This system will be canceled by either pressing A/C switch or turning the ignition switch OFF. Shifting
from one step to another is accomplished by means of turning temperature dial, as required.
Additionally shifting from STEP 5 to AUXILIARY MECHANISM is accomplished by means of pushing (fan)
UP switch.
RJIA0490E

ATC-52
TROUBLE DIAGNOSIS
14. CHECK MALFUNCTIONING DOOR MOTOR POSITION SWITCH
Mode or (and) intake door motor position switch(es) is (are) malfunctioning.
(If two or more mode or intake doors are out of order, corresponding code numbers blink respectively two
times.)
*1:If mode door motor harness connector is disconnected, the following display pattern will appear.
31→32→33→34→35→36→Return to 31
*2:If intake door motor harness connector is disconnected, the following display pattern will appear.
37→38→39→Return to 37
*3:AT C - 6 2 , "
Mode Door Motor Circuit" .
*4:AT C - 6 8 , "
Intake Door Motor Circuit" .
>> INSPECTION END
AUXILIARY MECHANISM: TEMPERATURE SETTING TRIMMER
The trimmer compensates for differences in range of ±3°C (±6°F) between temperature setting (displayed
digitally) and temperature felt by driver.
Operating procedures for this trimmer are as follows:
●Begin Self-diagnosis STEP 5 mode.
●Press (fan) UP switch to set system in auxiliary mode.
●Display shows 61 in auxiliary mechanism.It takes approximately 3 seconds.
●Turn the temperature dial as desired. Temperature will change at a rate of 1°C (2°F) each time a dial is
turned.
Code No. *1 *2 Mode or intake door position Reference page
31 VENT
Mode door motor *3 32 B/L
34 FOOT
35 D/F
36 DEF
37 FRE
Intake door motor *4 38 20% FRE
39 REC
RJIA0494E

TROUBLE DIAGNOSIS
ATC-53
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When battery cable is disconnected, trimmer operation is canceled. Temperature set becomes that of initial
condition, i.e. 0°C (0°F).
AUXILIARY MECHANISM: FOOT POSITION SETTING TRIMMER
Wind distribution ratio in Foot mode can be set.
Operating procedures for this trimmer are as follows:
●Begin Self-diagnosis STEP 5 mode.
●Press (fan) UP switch to set system in auxiliary mode.
●Display shows 61 in auxiliary mechanism.It takes approximately 3 seconds.
RJIA0495E