Infiniti Q45 (FY33). Manual — part 23
SAT557IA
Vehicle Speed Sensor
⋅
A/T (Revolution sensor)
DESCRIPTION
The revolution sensor detects the revolution of the output shaft
parking pawl lock gear and emits a pulse signal. The pulse signal
is sent to the TCM which converts it into vehicle speed.
TCM TERMINALS AND REFERENCE VALUE
Remarks: Specification data are reference values.
Terminal
No.
Wire color
Item
Condition
Judgement
standard
(Approx.)
25
W
Revolution sen-
sor
(Measure in AC
range)
When vehicle cruises at 30 km/h (19
MPH).
1V or more
Voltage rises
gradually in
response to
vehicle speed.
When vehicle parks.
0V
35
B
Throttle position
sensor
(Ground)
—
0V
ON BOARD DIAGNOSIS LOGIC
Diagnostic trouble code
Malfunction is detected when ...
Check item (Possible cause)
: VEH SPD SEN/CIR AT
TCM does not receive the proper volt-
age signal from the sensor.
I
Harness or connectors
(The sensor circuit is open or
shorted.)
I
Revolution sensor
: P0720
GI
MA
EM
LC
EC
FE
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0720
AT-89
SAT014K
SAT971J
SAT014K
SEF949Y
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMA-
TION CONFIRMATION PROCEDURE
CAUTION:
I
Always drive vehicle at a safe speed.
I
Be careful not to rev engine into the red zone on the
tachometer.
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” and wait at least 5 seconds before conducting
the next test.
After the repair, perform the following procedure to confirm the
malfunction is eliminated.
1)
Turn ignition switch “ON” and select “DATA MONITOR”
mode for “A/T” with CONSULT-II.
2)
Drive vehicle and check for an increase of “VHCL/S
SE
⋅
MTR” value.
If the check result is NG, go to “DIAGNOSTIC
PROCEDURE”, AT-153.
If the check result is OK, go to following step.
3)
Select “DATA MONITOR” mode for “ENGINE” with
CONSULT-II.
4)
Start engine and maintain the following conditions for at
least 5 consecutive seconds.
VHCL SPEED SE: 30 km/h (19 MPH) or more
THRTL POS SEN: More than 1.2V
Selector lever: D position (OD “ON”)
Driving location: Driving
the
vehicle
uphill
(increased engine load) will help
maintain the driving conditions
required for this test.
If the check result is NG, go to “DIAGNOSTIC
PROCEDURE”, AT-91.
If the check result is OK, go to following step.
5)
Maintain the following conditions for at least 5 consecu-
tive seconds.
CMPS
⋅
RPM (REF): 3,500 rpm or more
THRTL POS SEN: More than 1.2V
Selector lever: D position (OD “ON”)
Driving location: Driving
the
vehicle
uphill
(increased engine load) will help
maintain the driving conditions
required for this test.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Follow the procedure “With CONSULT-II”.
TROUBLE DIAGNOSIS FOR DTC P0720
Vehicle Speed Sensor
⋅
A/T (Revolution sensor)
(Cont’d)
AT-90
SAT738J
SAT919IA
DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK REVOLUTION SENSOR.
Refer to “Component Inspection” below.
OK
E
NG
Repair or replace revolu-
tion sensor.
CHECK INPUT SIGNAL.
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
⋅
A/T” while driving.
Check the value changes
according to driving speed.
-------------------------------------------------------------------------------------------------------------------------------------- OR --------------------------------------------------------------------------------------------------------------------------------------
1. Start engine.
2. Check voltage between TCM
terminal
q
25
and ground while
driving.
(Measure with AC range.)
Voltage:
At 0 km/h (0 MPH):
0V
At 30 km/h (19 MPH):
1V or more
(Voltage rises gradually in
response to vehicle speed.)
OK
E
NG
Check the following items:
I
Harness for short or
open between TCM,
ECM and revolution sen-
sor (Main harness)
I
Ground circuit for ECM
Refer to EC section
(“TROUBLE DIAGNOSIS
FOR POWER SUPPLY”).
Perform DIAGNOSTIC TROUBLE CODE
(DTC) CONFIRMATION PROCEDURE,
AT-90.
OK
E
NG
1. Perform TCM input/
output signal inspection.
2. If NG, recheck TCM pin
terminals for damage or
loose connection with
harness connector.
INSPECTION END
SAT386J
COMPONENT INSPECTION
Revolution sensor
I
For removal, refer to AT-195.
I
Check resistance between terminals
q
1
,
q
2
and
q
3
.
Terminal No.
Resistance
q
1
q
2
500 - 650
Ω
q
2
q
3
No continuity
q
1
q
3
No continuity
GI
MA
EM
LC
EC
FE
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0720
Vehicle Speed Sensor
⋅
A/T (Revolution sensor)
(Cont’d)
H
H
H
H
AT-91
Engine Speed Signal
DESCRIPTION
The engine speed signal is sent from the ECM to the TCM.
TCM TERMINALS AND REFERENCE VALUE
Remarks: Specification data are reference values.
Terminal
No.
Wire color
Item
Condition
Judgement
standard
(Approx.)
24
W/G
Engine speed
signal
When engine runs at idle speed.
1.2V
When engine runs at 3,000 rpm.
3.4V
ON BOARD DIAGNOSIS LOGIC
Diagnostic trouble code
Malfunction is detected when ...
Check item (Possible cause)
: ENGINE SPEED SIG
TCM does not receive the proper volt-
age signal from ECM.
I
Harness or connectors
(The sensor circuit is open or
shorted.)
: P0725
TROUBLE DIAGNOSIS FOR DTC P0725
AT-92
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