02 sensor INFINITI QX4 2001 Factory Manual PDF

SAT342HA
DescriptionNBAT0172The A/T fluid temperature sensor detects the A/T fluid temperature
and sends a signal to the TCM.
SAT021J
CONSULT-II REFERENCE VALUE IN DATA MONITOR
MODE
NBAT0172S02Remarks: Specification data are reference values.
Monitor item Condition Specification
A/T fluid tempera-
ture
sensorCold [20ÉC (68ÉF)]
"
Hot [80ÉC (176ÉF)]Approximately 1.5V
"
Approximately 0.5VApproximately 2.5 kW
"
Approximately 0.3 kW
TCM TERMINALS AND REFERENCE VALUENBAT0172S03Remarks: Specification data are reference values.
Terminal
No.Wire color Item ConditionJudgement
standard
(Approx.)
10 W/R Power source
When turning ignition switch to ªONº.Battery volt-
age
When turning ignition switch to ªOFFº. 0V
19 W/R Power source Same as No. 10
28 R/YPower source
(Memory back-up)
or
When turning ignition switch to ªOFFº.Battery volt-
age
When turning ignition switch to ªONº.Battery volt-
age
42 BThrottle position
sensor
(Ground)
Ð0V
47 RA/T fluid tempera-
ture sensorWhen ATF temperature is 20ÉC (68ÉF). 1.5V
When ATF temperature is 80ÉC (176ÉF). 0.5V
DTC BATT/FLUID TEMP SEN (A/T FLUID TEMP SENSOR CIRCUIT AND TCM
POWER SOURCE)
Description
AT-190

ON BOARD DIAGNOSIS LOGICNBAT0172S04
Diagnostic trouble code Malfunction is detected when ... Check item (Possible cause)
: BATT/FLUID TEMP SEN
TCM receives an excessively low or high
voltage from the sensor.IHarness or connectors
(The sensor circuit is open or shorted.)
IA/T fluid temperature sensor
: 8th judgement flicker
SAT014K
SAT971J
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NBAT0172S01After the repair, perform the following procedure to confirm the
malfunction is eliminated.
With CONSULT-II
1) Start engine.
2) Select ªDATA MONITORº mode for ªA/Tº with CONSULT-II.
3) Drive vehicle under the following conditions:
Selector lever in ªDº position, vehicle speed higher than 20
km/h (12 MPH).
SAT674I
No Tools
1) Start engine.
2) Drive vehicle under the following conditions:
Selector lever in ªDº position, vehicle speed higher than 20
km/h (12 MPH).
3) Perform self-diagnosis.
Refer to TCM SELF-DIAGNOSTIC PROCEDURE (No Tools),
AT-46.
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DTC BATT/FLUID TEMP SEN (A/T FLUID TEMP SENSOR CIRCUIT AND TCM
POWER SOURCE)
Description (Cont'd)
AT-191

Wiring Diagram Ð AT Ð BA/FTSNBAT0201
MAT916A
DTC BATT/FLUID TEMP SEN (A/T FLUID TEMP SENSOR CIRCUIT AND TCM
POWER SOURCE)
Wiring Diagram Ð AT Ð BA/FTS
AT-192

Diagnostic ProcedureNBAT0173
1 INSPECTION START
Do you have CONSULT-II?
YesorNo
Ye s©GO TO 2.
No©GO TO 6.
2 CHECK INPUT SIGNAL OF A/T FLUID TEMPERATURE SENSOR (WITH CONSULT-II)
With CONSULT-II
1. Start engine.
2. Select ªTCM INPUT SIGNALSº in ªDATA MONITORº mode for ªA/Tº with CONSULT-II.
3. Read out the value of ªFLUID TEMP SEº.
Voltage:
Cold [20ÉC (68ÉF)]®Hot [80ÉC (176ÉF)]:
Approximately 1.5V®0.5V
SAT614J
OK or NG
OK©GO TO 4.
NG©GO TO 3.
3 DETECT MALFUNCTIONING ITEM
Check the following items:
IHarness for short to ground or short to power or open between TCM, ECM and terminal cord assembly (Main harness)
IGround circuit for ECM.
Refer to EC-174, ªWiring Diagramº.
OK or NG
OK©GO TO 4.
NG©Repair or replace damaged parts.
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DTC BATT/FLUID TEMP SEN (A/T FLUID TEMP SENSOR CIRCUIT AND TCM
POWER SOURCE)
Diagnostic Procedure
AT-193

4 CHECK A/T FLUID TEMPERATURE SENSOR WITH TERMINAL CORD ASSEMBLY
1. Turn ignition switch to ªOFFº position.
2. Disconnect terminal cord assembly connector on the right side of transfer assmebly.
3. Check resistance between terminals 8 and 9 when A/T is cold [20ÉC (68ÉF)].
SAT697I
Is resistance approx. 2.5 kW?
Ye s©GO TO 7.
No©GO TO 5.
5 DETECT MALFUNCTIONING ITEM
1. Remove oil pan.
2. Check the following items:
IA/T fluid temperature sensor
Refer to ªComponent Inspectionº, AT-110.
IHarness of terminal cord assembly for short or open
OK or NG
OK©GO TO 7.
NG©Repair or replace damaged parts.
6 CHECK INPUT SIGNAL OF A/T FLUID TEMPERATURE SENSOR (WITHOUT CONSULT-II)
Without CONSULT-II
1. Start engine.
2. Check voltage between TCM terminal 47 and ground while warming up A/T.
Voltage:
Cold [20ÉC (68ÉF)]®Hot [80ÉC (176ÉF)]:
Approximately 1.5V®0.5V
SAT518J
OK or NG
OK©GO TO 4.
NG©GO TO 3.
DTC BATT/FLUID TEMP SEN (A/T FLUID TEMP SENSOR CIRCUIT AND TCM
POWER SOURCE)
Diagnostic Procedure (Cont'd)
AT-194

7 CHECK TCM POWER SOURCE STEP 1
1. Turn ignition switch to ON position.
(Do not start engine.)
2. Check voltage between TCM terminals 10, 19, 28 and ground.
SAT611J
OK or NG
OK©GO TO 8.
NG©GO TO 9.
8 CHECK TCM POWER SOURCE STEP 2
1. Turn ignition switch to OFF position.
2. Check voltage between TCM terminal 28 and ground.
SAT612JC
OK or NG
OK©GO TO 10.
NG©GO TO 9.
9 DETECT MALFUNCTIONING ITEM
Check the following items:
IHarness for short or open between ignition switch and TCM terminals 10, 19 and 28 (Main harness)
IIgnition switch and 10A or 7.5A fuse [No. 18 or 24, located in the fuse block (J/B)]
Refer to EL-9, ªSchematicº.
OK or NG
OK©GO TO 10.
NG©Repair or replace damaged parts.
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DTC BATT/FLUID TEMP SEN (A/T FLUID TEMP SENSOR CIRCUIT AND TCM
POWER SOURCE)
Diagnostic Procedure (Cont'd)
AT-195

10 CHECK TCM GROUND CIRCUIT
1. Turn ignition switch to OFF position.
2. Disconnect TCM harness connector.
3. Check continuity between TCM terminals 25, 48 and ground. Refer to wiring diagram Ð AT Ð MAIN.
Continuity should exist.
If OK, check harness for short to ground and short to power.
OK or NG
OK©GO TO 11.
NG©Repair open circuit or short to ground or short to power in harness or connectors.
11 CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-106.
OK or NG
OK©INSPECTION END
NG©GO TO 12.
12 CHECK TCM INSPECTION
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK©INSPECTION END
NG©Repair or replace damaged parts.
SAT687I
Component InspectionNBAT0174A/T FLUID TEMPERATURE SENSORNBAT0174S01IFor removal, refer to AT-273.
ICheck resistance between terminals 8 and 9 while changing
temperature as shown at left.
Temperature ÉC (ÉF) Resistance
20 (68) Approximately 2.5 kW
80 (176) Approximately 0.3 kW
DTC BATT/FLUID TEMP SEN (A/T FLUID TEMP SENSOR CIRCUIT AND TCM
POWER SOURCE)
Diagnostic Procedure (Cont'd)
AT-196

DescriptionNBAT0071The vehicle speed sensor´MTR is built into the speedometer
assembly. The sensor functions as an auxiliary device to the revo-
lution sensor when it is malfunctioning. The TCM will then use a
signal sent from the vehicle speed sensor´MTR.
TCM TERMINALS AND REFERENCE VALUENBAT0071S02Remarks: Specification data are reference values.
Terminal
No.Wire color Item ConditionJudgement
standard
(Approx.)
40 W/LVehicle speed
sensor
When moving vehicle at 2 to 3 km/h (1 to 2
MPH) for1m(3ft)ormore.Voltage varies
between less
than 1V and
more than
4.5V
ON BOARD DIAGNOSIS LOGICNBAT0071S03
Diagnostic trouble code Malfunction is detected when ... Check item (Possible cause)
: VHCL SPEED SEN´MTR
TCM does not receive the proper voltage
signal from the sensor.IHarness or connectors
(The sensor circuit is open or shorted.)
IVehicle speed sensor
: 2nd judgement flicker
SAT014K
SAT971J
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NBAT0071S01CAUTION:
IAlways drive vehicle at a safe speed.
IIf conducting this ªDTC CONFIRMATION PROCEDUREº
again, always turn ignition switch ªOFFº and wait at least
5 seconds before continuing.
After the repair, perform the following procedure to confirm the
malfunction is eliminated.
With CONSULT-II
1) Turn ignition switch ªONº and select ªDATA MONITORº mode
for ªA/Tº with CONSULT-II.
2) Start engine and accelerate vehicle from 0 to 25 km/h (0 to 6
MPH).
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DTC VEHICLE SPEED SENSOR´MTR
Description
AT-197

SAT668I
No Tools
1) Start engine.
2) Drive vehicle under the following conditions:
Selector lever in ªDº position and vehicle speed higher than 25
km/h (16 MPH).
3) Perform self-diagnosis.
Refer to TCM SELF-DIAGNOSTIC PROCEDURE (No Tools),
AT-46.
DTC VEHICLE SPEED SENSOR´MTR
Description (Cont'd)
AT-198

Wiring Diagram Ð AT Ð VSSMTRNBAT0202
MAT917A
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DTC VEHICLE SPEED SENSOR´MTR
Wiring Diagram Ð AT Ð VSSMTR
AT-199