Infiniti FX35 / FX45. Manual - part 430

DTC P1574 ICC VEHICLE SPEED SENSOR

EC-481

< SERVICE INFORMATION >

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DTC P1574 ICC VEHICLE SPEED SENSOR

Component Description

INFOID:0000000001326344

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-7

 for ICC functions.

On Board Diagnosis Logic

INFOID:0000000001326345

• 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-146

.

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

to 

EC-148

.

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

to 

EC-407

.

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

to 

EC-422

.

DTC Confirmation Procedure

INFOID:0000000001326346

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.

2.

Drive the vehicle at more than 40 km/h (25MPH).

3.

Check DTC.

4.

If DTC is detected, go to 

EC-481, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001326347

1.

CHECK DTC WITH TCM

Check DTC with TCM. Refer to 

AT-38

.

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-13

.

OK or NG

OK

>> GO TO 3.

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

(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-482

< SERVICE INFORMATION >

[VQ35DE]

DTC P1574 ICC VEHICLE SPEED SENSOR

NG

>> Repair or replace.

3.

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

Refer to 

DI-5

.

>> INSPECTION END

DTC P1574 ASCD VEHICLE SPEED SENSOR

EC-483

< SERVICE INFORMATION >

[VQ35DE]

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DTC P1574 ASCD VEHICLE SPEED SENSOR

Component Description

INFOID:0000000001326348

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 ASCD
control. Refer to 

EC-37

 for ASCD functions.

On Board Diagnosis Logic

INFOID:0000000001326349

• 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-146

.

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

to 

EC-148

.

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

to 

EC-407

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

to 

EC-422

DTC Confirmation Procedure

INFOID:0000000001326350

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-III

1.

Start engine.

2.

Drive the vehicle at more than 40 km/h (25 MPH).

3.

Check DTC.

4.

If DTC is detected, go to 

EC-483, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001326351

1.

CHECK DTC WITH TCM

Check DTC with TCM. Refer to 

AT-38

.

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-13

.

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

(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-484

< SERVICE INFORMATION >

[VQ35DE]

DTC P1574 ASCD VEHICLE SPEED SENSOR

OK

>> GO TO 3.

NG

>> Repair or replace.

3.

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

Refer to 

DI-5

.

>> INSPECTION END