Infiniti M35/M45 Y50. Manual - part 528

DTC P1574 ICC VEHICLE SPEED SENSOR

EC-585

[VQ35DE]

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Diagnostic Procedure

NBS0055H

1. 

CHECK DTC WITH TCM

Check DTC with TCM. Refer to 

AT-40, "ON BOARD DIAGNOSTIC (OBD) SYSTEM"

 .

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)”

Refer to 

BRC-10, "TROUBLE DIAGNOSIS"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace.

3. 

CHECK DTC WITH “UNIFIED METER AND A/C AMP.”

Check combination meter function.
Refer to 

DI-28, "UNIFIED METER AND A/C AMP"

 .

>> INSPECTION END

EC-586

[VQ35DE]

DTC P1574 ASCD VEHICLE SPEED SENSOR

DTC P1574 ASCD VEHICLE SPEED SENSOR

PFP:31036

Component Description

NBS0055I

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 

EC-36, "AUTOMATIC SPEED CONTROL DEVICE (ASCD)"

  for ASCD functions.

On Board Diagnosis Logic

NBS0055J

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 

EC-161, "DTC U1000, U1001 CAN COMMUNICATION LINE"

 .

●

If DTC P1574 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010.
Refer to 

EC-164, "DTC U1010 CAN COMMUNICATION"

 .

●

If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500.
Refer to 

EC-468, "DTC P0500 VSS"

●

If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605.
Refer to 

EC-483, "DTC P0605 ECM"

DTC Confirmation Procedure

NBS0055K

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.

If DTC is detected, go to 

EC-587, "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.)

●

Unified meter and A/C amp.

●

ABS actuator and electric unit (control unit)

●

Wheel sensor

●

TCM

●

ECM

PBIB2673E

DTC P1574 ASCD VEHICLE SPEED SENSOR

EC-587

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Diagnostic Procedure

NBS0055L

1. 

CHECK DTC WITH TCM

Check DTC with TCM. Refer to 

AT-40, "ON BOARD DIAGNOSTIC (OBD) SYSTEM"

 .

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)”

Refer to 

BRC-10, "TROUBLE DIAGNOSIS"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace.

3. 

CHECK DTC WITH “UNIFIED METER AND A/C AMP.”

Refer to 

DI-28, "UNIFIED METER AND A/C AMP"

 .

>> INSPECTION END

EC-588

[VQ35DE]

DTC P1715 INPUT SPEED SENSOR (TURBINE REVOLUTION SENSOR)

DTC P1715 INPUT SPEED SENSOR (TURBINE REVOLUTION SENSOR)

PFP:31935

Description

NBS0055M

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

NBS0055N

Specification data are reference values.

On Board Diagnosis Logic

NBS0055O

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 

EC-483, "DTC P0605 ECM"

 .

●

If DTC P1715 is displayed with DTC P0335, first perform the trouble diagnosis for DTC P0335.
Refer to 

EC-364, "DTC P0335 CKP SENSOR (POS)"

 .

●

If DTC P1715 is displayed with DTC P0340, P0345 first perform the trouble diagnosis for DTC
P0340, P0345. Refer to 

EC-371, "DTC P0340, P0345 CMP SENSOR (PHASE)"

 .

The MIL will not lights up for this diagnosis.

Diagnostic Procedure

NBS0055P

1. 

CHECK DTC WITH TCM

Check DTC with TCM. Refer to 

AT-40, "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 

AT-44, "TROUBLE DIAGNOSIS"

 .

>> 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