Infiniti M35/M45 Y50. Manual - part 706

DTC P1574 ICC VEHICLE SPEED SENSOR

EC-1297

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EC

DTC P1574 ICC VEHICLE SPEED SENSOR

PFP:31036

Component Description

NBS005N2

The ECM receives two vehicle speed 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 ICC
control. Refer to 

ACS-6, "DESCRIPTION"

  for ICC functions.

On Board Diagnosis Logic

NBS005N3

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-865, "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-868, "DTC U1010 CAN COMMUNICATION"

 .

●

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

EC-1175, "DTC P0500 VSS"

 .

●

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

EC-1190, "DTC P0605 ECM"

.

DTC Confirmation Procedure

NBS005N4

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 (25MPH).

4.

If DTC is detected, go to 

EC-1298, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1574
1574

ICC 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

SEF058Y

EC-1298

[VK45DE]

DTC P1574 ICC VEHICLE SPEED SENSOR

Diagnostic Procedure

NBS005N5

1. 

CHECK DTC WITH TCM

Check DTC with TCM. Refer to 

AT-40, "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 “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

DTC P1574 ASCD VEHICLE SPEED SENSOR

EC-1299

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EC

DTC P1574 ASCD VEHICLE SPEED SENSOR

PFP:31036

Component Description

NBS005N6

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-738, "AUTOMATIC SPEED CONTROL DEVICE (ASCD)"

  for ASCD functions.

On Board Diagnosis Logic

NBS005N7

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-865, "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-868, "DTC U1010 CAN COMMUNICATION"

 .

●

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

EC-1175, "DTC P0500 VSS"

●

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

EC-1190, "DTC P0605 ECM"

DTC Confirmation Procedure

NBS005N8

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-1300, "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

SEF058Y

EC-1300

[VK45DE]

DTC P1574 ASCD VEHICLE SPEED SENSOR

Diagnostic Procedure

NBS005N9

1. 

CHECK DTC WITH TCM

Check DTC with TCM. Refer to 

AT-40, "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 “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