Infiniti G35 (V35). Manual — part 421
DTC P1574 ASCD VEHICLE SPEED SENSOR
EC-565
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EC
DTC P1574 ASCD VEHICLE SPEED SENSOR
PFP:31036
Component Description
NBS00104
The ECM receives two vehicle speed sensor signals via CAN communication line. One is sent from combina-
tion meter and the other is from TCM (Transmission control module). The ECM uses these signals for ASCD
control. Refer to
EC-29, "AUTOMATIC SPEED CONTROL DEVICE (ASCD)"
for ASCD functions.
On Board Diagnosis Logic
NBS00105
●
This self-diagnosis has the one trip detection logic.
●
The MIL will not light up for this self-diagnosis.
NOTE:
●
If DTC P1574 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to
EC-161, "DTC U1000, U1001 CAN COMMUNICATION LINE"
.
●
If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500.
Refer to
●
If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605.
Refer to
DTC Confirmation Procedure
NBS00106
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.
WITH CONSULT-II
1.
Start engine (VDC switch OFF).
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Drive the vehicle at more than 40 km/h (25 MPH).
4.
EC-566, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
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.)
●
Combination meter
●
VDC/TCS/ABS control unit
●
Wheel sensor
●
TCM (A/T models)
●
ECM
PBIB2673E
EC-566
DTC P1574 ASCD VEHICLE SPEED SENSOR
Diagnostic Procedure
NBS00107
1.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
AT-37, "OBD-II Diagnostic Trouble Code (DTC)"
.
OK or NG
OK
>> GO TO 2.
NG
>> Perform trouble shooting relevant to DTC indicated.
2.
CHECK DTC WITH VDC/TCS/ABS CONTROL UNIT
Refer to
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace.
3.
CHECK COMBINATION METER
Check combination meter function.
Refer to
.
>> INSPECTION END
DTC P1715 INPUT SPEED SENSOR (TURBINE REVOLUTION SENSOR)
EC-567
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EC
DTC P1715 INPUT SPEED SENSOR (TURBINE REVOLUTION SENSOR)
PFP:31935
Description
NBS002W5
ECM receives turbine revolution sensor signal from TCM through CAN communication line. ECM uses this
signal for engine control.
CONSULT-II Reference Value in Data Monitor Mode
NBS002W6
Specification data are reference values.
On Board Diagnosis Logic
NBS002W7
NOTE:
●
If DTC P1715 is displayed with DTC U1000, U1001 first perform the trouble diagnosis for DTC
U1000, U1001. Refer to
EC-161, "DTC U1000, U1001 CAN COMMUNICATION LINE"
.
●
If DTC P1715 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010.
Refer to
EC-164, "DTC U1010 CAN COMMUNICATION"
●
If DTC P1715 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605.
Refer to
●
If DTC P1715 is displayed with DTC P0340 or P0345 first perform the trouble diagnosis for DTC
P0340 or P0345. Refer to
EC-382, "DTC P0340, P0345 CMP SENSOR (PHASE)"
The MIL will not light up for this self-diagnosis.
Diagnostic Procedure
NBS002W8
1.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
AT-37, "ON BOARD DIAGNOSTIC (OBD) SYSTEM"
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 (12MPH)
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
shorted)
●
Harness or connectors
(Turbine revolution sensor circuit is open or
shorted)
●
TCM
EC-568
DTC P1805 BRAKE SWITCH
DTC P1805 BRAKE SWITCH
PFP:25320
Description
NBS0010F
Brake switch signal is applied to the ECM through the stop lamp switch when the brake pedal is depressed.
This signal is used mainly to decrease the engine speed when the vehicle is driving.
CONSULT-II Reference Value in Data Monitor Mode
NBS0010G
Specification data are reference values.
On Board Diagnosis Logic
NBS0010H
The MIL will not light up for this self-diagnosis.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode.
DTC Confirmation Procedure
NBS0010I
WITH CONSULT-II
1.
Turn ignition switch ON.
2.
Fully depress the brake pedal for at least 5 seconds.
3.
Erase the DTC with CONSULT-II.
4.
Select “DATA MONITOR” mode with CONSULT-II.
5.
If 1st trip DTC is detected, go to
EC-570, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
MONITOR ITEM
CONDITION
SPECIFICATION
BRAKE SW
●
Ignition switch: ON
Brake pedal: Fully released
OFF
Brake pedal: Slightly depressed
ON
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1805
1805
Brake switch
A brake switch signal is not sent to ECM for
extremely long time while the vehicle is driving.
●
Harness or connectors
(The stop lamp switch circuit is open or
shorted.)
●
Stop lamp switch
Engine operating condition in fail-safe mode
ECM controls the electric throttle control actuator by regulating the throttle opening to a small range.
Therefore, acceleration will be poor.
Vehicle condition
Driving condition
When engine is idling
Normal
When accelerating
Poor acceleration
SEF058Y
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