Infiniti FX35, FX50 (S51). Manual - part 880

P1574 ICC VEHICLE SPEED SENSOR

EC-1061

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P1574 ICC VEHICLE SPEED SENSOR

Description

INFOID:0000000005237555

The ECM receives two vehicle speed signals by the 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 

CCS-24, "System Description"

 for ICC functions.

DTC Logic

INFOID:0000000005237556

DTC DETECTION LOGIC

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

to 

EC-948, "DTC Logic"

.

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

to 

EC-962, "DTC Logic"

.

• If DTC P1574 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer

to 

EC-964, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test. 
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine (VDC switch OFF).

2.

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

CAUTION:

Always drive vehicle at a safe speed.
NOTE:
This procedure 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.

3.

Check DTC.

Is DTC detected?

YES

>> Go to 

EC-1061, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005237557

1.

CHECK DTC WITH TCM

Check DTC with TCM. Refer to 

TM-242, "Diagnosis Description"

.

Is the inspection result normal?

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1574

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

EC-1062

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

P1574 ICC VEHICLE SPEED SENSOR

YES

>> GO TO 2.

NO

>> Perform Diagnosis Procedure corresponding to the DTC indicated.

2.

CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”

Refer to 

BRC-44, "CONSULT-III Function"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Perform Diagnosis Procedure corresponding to the DTC indicated.

3.

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

Check combination meter function.
Refer to 

MWI-45, "CONSULT-III Function (METER/M&A)"

.

>> INSPECTION END

P1606 VVEL CONTROL MODULE

EC-1063

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P1606 VVEL CONTROL MODULE

Description

INFOID:0000000005237558

The VVEL control module consists of a microcomputer and connec-
tors for signal input and output and for power supply. The VVEL con-
trol module controls VVEL system.

DTC Logic

INFOID:0000000005237559

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test. 
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10 V at idle.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON and wait at least 1 second.

2.

Check DTC.

Is DTC detected?

YES

>> Go to 

EC-1063, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005237560

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON.

2.

Erase DTC.

3.

Perform DTC Confirmation Procedure.
See 

EC-1063, "DTC Logic"

.

Is the DTC P1606 displayed again?

YES

>> GO TO 2.

NO

>> INSPECTION END

2.

REPLACE VVEL CONTROL MODULE

1.

Replace VVEL control module.

JMBIA0879ZZ

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1606

VVEL control module

• VVEL control module calculation function is 

malfunctioning.

• VVEL EEP-ROM system is malfunctioning.

• VVEL control module

EC-1064

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

P1606 VVEL CONTROL MODULE

2.

Perform 

EC-579, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (VVEL CONTROL

MODULE) : Special Repair Requirement"

.

>> INSPECTION END