Infiniti FX35 / FX45. Manual — part 579
DTC P1574 ASCD VEHICLE SPEED SENSOR
EC-1077
< SERVICE INFORMATION >
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DTC P1574 ASCD VEHICLE SPEED SENSOR
Component Description
INFOID:0000000001326953
The ECM receives two vehicle speed sensor signals via CAN communication line. One is sent from “unified
meter and A/C amp.”, and the other is from TCM (Transmission control module). The ECM uses these signals
for ASCD control. Refer to
for ASCD functions.
On Board Diagnosis Logic
INFOID:0000000001326954
This self-diagnosis has the one trip detection logic.
The MIL will not light up for this diagnosis.
NOTE:
• If DTC P1574 is displayed with DTC U1000, U1001, first perform the trouble diagnosis for DTC U1000,
U1001. Refer to
• If DTC P1574 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer
.
• If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer
• If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
DTC Confirmation Procedure
INFOID:0000000001326955
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Step 3 may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road test
is expected to be easier, it is unnecessary to lift the vehicle.
1.
Start engine (VDC switch OFF).
2.
Drive the vehicle at more than 40 km/h (25 MPH).
3.
Check DTC.
4.
If DTC is detected, go to
EC-1077, "Diagnosis Procedure"
.
Diagnosis Procedure
INFOID:0000000001326956
1.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Perform trouble shooting relevant to DTC indicated.
2.
CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”
.
OK or NG
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible cause
P1574
1574
ASCD vehicle speed
sensor
ECM detects a difference between two vehicle
speed signals is out of the specified range.
• Harness or connectors
(The CAN communication line is open or
shorted.)
• Unified meter and A/C amp.
• ABS actuator and electric unit (control unit)
• Wheel sensor
• TCM
• ECM
EC-1078
< SERVICE INFORMATION >
[VK45DE]
DTC P1574 ASCD VEHICLE SPEED SENSOR
OK
>> GO TO 3.
NG
>> Repair or replace.
3.
CHECK DTC WITH “UNIFIED METER AND A/C AMP.”
>> INSPECTION END
DTC P1715 INPUT SPEED SENSOR (TURBINE REVOLUTION SENSOR)
EC-1079
< SERVICE INFORMATION >
[VK45DE]
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DTC P1715 INPUT SPEED SENSOR (TURBINE REVOLUTION SENSOR)
Description
INFOID:0000000001326957
ECM receives turbine revolution sensor signal from TCM through CAN communication line. ECM uses this
signal for engine control.
CONSULT-III Reference Value in Data Monitor Mode
INFOID:0000000001326958
Specification data are reference values.
On Board Diagnosis Logic
INFOID:0000000001326959
NOTE:
• If DTC P1715 is displayed with DTC U1000, U1001 first perform the trouble diagnosis for DTC U1000,
U1001. Refer to
• If DTC P1715 is displayed with DTC U1010 first perform the trouble diagnosis for DTC U1010. Refer
.
• If DTC P1715 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
.
• If DTC P1715 is displayed with DTC P0335, first perform the trouble diagnosis for DTC P0335. Refer
.
• If DTC P1715 is displayed with DTC P0340, first perform the trouble diagnosis for DTC P0340. Refer
.
The MIL will not lights up for this diagnosis.
Diagnosis Procedure
INFOID:0000000001326960
1.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
AT-38, "OBD-II Diagnostic Trouble Code (DTC)"
.
OK or NG
OK
>> GO TO 2.
NG
>> Perform trouble shooting relevant to DTC indicated.
2.
REPLACE TCM
Replace TCM. Refer to
>> INSPECTION END
MONITOR ITEM
CONDITION
SPECIFICATION
I/P PULLY SPD
• Vehicle speed: More than 20 km/h (12 MPH)
Almost the same speed as
the tachometer indication
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1715
1715
Input speed sensor
(Turbine revolution sen-
sor)
(TCM output)
Turbine revolution sensor signal is differ-
ent from the theoretical value calculated
by ECM from revolution sensor signal and
engine rpm signal.
• Harness or connectors
(The CAN communication line is open or short-
ed)
• Harness or connectors
(Turbine revolution sensor circuit is open or
shorted)
• TCM
EC-1080
< SERVICE INFORMATION >
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DTC P1800 VIAS CONTROL SOLENOID VALVE
DTC P1800 VIAS CONTROL SOLENOID VALVE
Component Description
INFOID:0000000001326961
The VIAS control solenoid valve (1) cuts the intake manifold vacuum
signal for power valve actuator. It responds to ON/OFF signals from
the ECM. When the solenoid is off, the vacuum signal from the
intake manifold is cut. When the ECM sends an ON signal the coil
pulls the plunger downward and feeds the vacuum signal to the
power valve actuator.
• Vacuum tank (2)
CONSULT-III Reference Value in Data Monitor Mode
INFOID:0000000001326962
Specification data are reference values.
On Board Diagnosis Logic
INFOID:0000000001326963
The MIL will not light up for this self-diagnosis.
DTC Confirmation Procedure
INFOID:0000000001326964
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is between 11V at idle.
1.
Start engine and let it idle for at least 5 seconds.
2.
Check 1st trip DTC.
3.
If 1st trip DTC is detected, go to
EC-1082, "Diagnosis Procedure"
PBIB3236E
MONITOR ITEM
CONDITION
SPECIFICATION
VIAS S/V
• Selector lever: P or N
ON
• Engine speed: More than 5,000 rpm
• Selector lever: Except P or N
• Engine speed: Less than 5,000 rpm
OFF
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1800
1800
VIAS control solenoid valve cir-
cuit
An excessively low or high voltage signal
is sent to ECM through the valve
• Harness or connectors
(The solenoid valve circuit is open or
shorted.)
• VIAS control solenoid valve
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