Infiniti QX4 (R50). Manual — part 50
Description
NBAT0071
The 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 VALUE
NBAT0071S02
Remarks: Specification data are reference values.
Terminal
No.
Wire color
Item
Condition
Judgement
standard
(Approx.)
40
W/L
Vehicle speed
sensor
When 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
ON BOARD DIAGNOSIS LOGIC
NBAT0071S03
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.
I
Harness or connectors
(The sensor circuit is open or shorted.)
I
Vehicle speed sensor
: 2nd judgement flicker
SAT014K
SAT971J
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NBAT0071S01
CAUTION:
I
Always drive vehicle at a safe speed.
I
If conducting this “DTC CONFIRMATION PROCEDURE”
again, always turn ignition switch “OFF” 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 “ON” and select “DATA MONITOR” mode
for “A/T” with CONSULT-II.
2)
Start engine and accelerate vehicle from 0 to 25 km/h (0 to 6
MPH).
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC VEHICLE SPEED SENSOR·MTR
Description
AT-197
SAT668I
No Tools
1)
Start engine.
2)
Drive vehicle under the following conditions:
Selector lever in “D” 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 — AT — VSSMTR
NBAT0202
MAT917A
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC VEHICLE SPEED SENSOR·MTR
Wiring Diagram — AT — VSSMTR
AT-199
Diagnostic Procedure
NBAT0072
1
CHECK INPUT SIGNAL.
With CONSULT-II
1. Start engine.
2. Select “TCM INPUT SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Read out the value of “VHCL/S SE·MTR” 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) for 1 m (3 ft) or more.
SAT528J
Does battery voltage vary between less than 1V and more than 4.5V?
Yes
©
GO TO 3.
No
©
GO TO 2.
2
DETECT MALFUNCTIONING ITEM
Check the following items:
I
Vehicle speed sensor and ground circuit for vehicle speed sensor
Refer to EL-94, “Component Parts and Harness Connector Location”.
I
Harness 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
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