Infiniti G37 Coupe. Manual - part 566

P1574 ICC VEHICLE SPEED SENSOR

EC-445

< COMPONENT DIAGNOSIS >

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P1574 ICC VEHICLE SPEED SENSOR

Description

INFOID:0000000001734269

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 

CCS-15, "System Description"

 for ICC functions.

DTC Logic

INFOID:0000000001734270

DTC DETECTION LOGIC

NOTE:
• If DTC P1574 is displayed with DTC U1000, U1001, first perform the trouble diagnosis for DTC U1000,

U1001. Refer to 

EC-146, "DTC Logic"

.

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

to 

EC-147, "DTC Logic"

.

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

to 

EC-337, "DTC Logic"

.

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

to 

EC-356, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.

>> 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-445, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001734271

1.

CHECK DTC WITH TCM

Check DTC with TCM. Refer to 

TM-111, "Diagnosis Description"

.

Is the inspection result normal?

YES

>> GO TO 2.

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-446

< COMPONENT DIAGNOSIS >

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P1574 ICC VEHICLE SPEED SENSOR

NO

>> Perform trouble shooting relevant to DTC indicated.

2.

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

Refer to 

BRC-26, "CONSULT-III Function"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace.

3.

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

Check combination meter function.
Refer to 

MWI-37, "CONSULT-III Function (METER/M&A)"

.

>> INSPECTION END

P1606 VVEL CONTROL MODULE

EC-447

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P1606 VVEL CONTROL MODULE

Description

INFOID:0000000001736777

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:0000000001736778

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing 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 10V 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-447, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001736779

1.

PERFORM DTC CONFIRMATION PROCEDURE

 With CONSULT-III

1.

Turn ignition switch ON.

2.

Select “SELF-DIAG RESULTS” mode with CONSULT-III.

3.

Touch “ERASE”.

4.

Perform DTC Confirmation Procedure.
See 

EC-447, "DTC Logic"

.

 With GST

1.

Turn ignition switch ON.

2.

Select Service $04 with GST.

3.

Perform DTC Confirmation Procedure.

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 malfunc-

tioning.

• VVEL control module

EC-448

< COMPONENT DIAGNOSIS >

[VQ37VHR]

P1606 VVEL CONTROL MODULE

See 

EC-447, "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.

2.

Go to 

EC-17, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (VVEL CONTROL MOD-

ULE) : Special Repair Requirement"

.

>> INSPECTION END