2001 INFINITI QX4 elec

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

Diagnostic ProcedureNBAT0072
1 CHECK INPUT SIGNAL.
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 ªVHCL/S SE´MTRº while driving.
Check the value changes according to driving speed.
SAT614J
Without CONSULT-II
1. Start engine.
2. Check voltage between TCM terminal 40 and ground while driving at 2 to 3 km/h (1 to 2 MPH) for1m(3ft)ormore.
SAT528J
Does battery voltage vary between less than 1V and more than 4.5V?
Ye s©GO TO 3.
No©GO TO 2.
2 DETECT MALFUNCTIONING ITEM
Check the following items:
IVehicle speed sensor and ground circuit for vehicle speed sensor
Refer to EL-94, ªComponent Parts and Harness Connector Locationº.
IHarness for short or open between TCM and vehicle speed sensor (Main harness)
OK or NG
OK©GO TO 3.
NG©Repair or replace damaged parts.
3 CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-197.
OK or NG
OK©INSPECTION END
NG©GO TO 4.
DTC VEHICLE SPEED SENSOR´MTR
Diagnostic Procedure
AT-200

SAT014K
SAT971J
SAT635I
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NBAT0224S03CAUTION:
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) Start engine.
2) Select ªDATA MONITORº mode for ªA/Tº with CONSULT-II.
3) Drive vehicle under the following conditions:
Selector lever in ªDº, vehicle speed higher than 40 km/h (25
MPH), engine speed higher than 1,500 rpm, throttle opening
greater than 1.0/8 of the full throttle position and driving for
more than 5 seconds.
No Tools
1) Start engine.
2) Drive vehicle under the following conditions:
Selector lever in ªDº, vehicle speed higher than 40 km/h (25
MPH), engine speed higher than 1,500 rpm, throttle opening
greater than 1/8 of the full throttle position and driving for more
than 5 seconds.
3) Perform self-diagnosis.
Refer to TCM SELF-DIAGNOSTIC PROCEDURE (No Tools),
AT-46.
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DTC TURBINE REVOLUTION SENSOR
Description (Cont'd)
AT-203

Diagnostic ProcedureNBAT0226
1 CHECK INPUT SIGNAL
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 ªTURBINE REVº. Check the value changes according to engine speed.
SAT740J
Without CONSULT-II
1. Start engine.
2. Check voltage between TCM terminal 38 and ground. (Measure in AC range.)
SAT140K
OK or NG
OK©GO TO 3.
NG©GO TO 2.
2 DETECT MALFUNCTIONING ITEM
Check harness for short or open between TCM and turbine revolution sensor.
OK or NG
OK©GO TO 3.
NG©Repair or replace damaged parts.
3 CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-203.
OK or NG
OK©INSPECTION END
NG©GO TO 4.
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DTC TURBINE REVOLUTION SENSOR
Diagnostic Procedure
AT-205

SAT014K
SAT971J
SAT682I
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NBAT0228S03After the repair, perform the following procedure to confirm the
malfunction is eliminated.
With CONSULT-II
1) Turn ignition switch ªONº.
2) Select ªDATA MONITORº mode for ªA/Tº with CONSULT-II.
3) Wait at least 6 seconds or start engine and wait for at least 6
seconds.
No Tools
1) Turn ignition switch ªONº.
2) Wait at least 6 seconds or start engine and wait for at least 6
seconds.
3) Perform self-diagnosis.
Refer to TCM SELF-DIAGNOSTIC PROCEDURE (No Tools),
AT-46.
DTC A/T COMMUNICATION LINE
Description (Cont'd)
AT-208

SAT574J
DescriptionNBAT0207The TCM consists of a microcomputer and connectors for signal
input and output and for power supply. The unit controls the A/T.
ON BOARD DIAGNOSIS LOGICNBAT0207S01
Diagnostic trouble code Malfunction is detected when ... Check item (Possible cause)
: CONTROL UNIT (RAM)
: CONTROL UNIT (ROM)TCM memory (RAM) or (ROM) is mal-
functioning.TCM
SAT014K
SAT971J
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NBAT0207S02NOTE:
If ªDIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DUREº has been previously conducted, always turn ignition
switch ªOFFº and wait at least 5 seconds before conducting
the next test.
With CONSULT-II
1) Turn ignition switch ªONº and select ªDATA MONITORº mode
for A/T with CONSULT-II.
2) Start engine.
3) Run engine for at least 2 seconds at idle speed.
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DTC CONTROL UNIT (RAM), CONTROL UNIT (ROM)
Description
AT-211

Diagnostic Procedure=NBAT0208
1 CHECK DTC
With CONSULT-II
1. Turn ignition switch ªONº and select ªSELF DIAG RESULTSº mode for A/T with CONSULT-II.
2. Touch ªERASEº.
PERFORM DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE.
See previous page.
Is the ªCONTROL UNIT (RAM) or CONTROL UNIT (ROM)º displayed again?
Ye s©Replace TCM.
No©INSPECTION END
DTC CONTROL UNIT (RAM), CONTROL UNIT (ROM)
Diagnostic Procedure
AT-212