2011 INFINITI QX56 Factory Service Manual

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Page 2473 of 5598

INFINITI QX56 2011 Factory Service Manual
P1574 ICC VEHICLE SPEED SENSOR
EC-449
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
P1574 ICC VEHICLE SPEED SENSOR
DescriptionINFOID:0000000006288352
The ECM receives two vehicle

P1574 ICC VEHICLE SPEED SENSOR
EC-449
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
C
D
E
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G H
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K L
M A
EC
NP
O
P1574 ICC VEHICLE SPEED SENSOR
DescriptionINFOID:0000000006288352
The ECM receives two vehicle speed signals by the CAN
communication line. One is sent from “combination
meter”, and the other is from TCM (Transmission cont rol module). The ECM uses these signals for ICC con-
trol. Refer to CCS-12, "
System Description" for ICC functions.
DTC LogicINFOID:0000000006288353
DTC DETECTION LOGIC
NOTE:
If DTC P1574 is displayed with DTC UXXXX, first perform the tr ouble diagnosis for DTC UXXXX.
If DTC P1574 is displayed with DT C P0500, first perform the trouble diagnosis for DTC P0500. Refer
to EC-356, "
DTC Logic".
If DTC P1574 is displayed with DT C P0605, first perform the trouble diagnosis for DTC P0605. Refer
to EC-376, "
DTC Logic".
If DTC P1574 is displayed with DT C P0607, first perform the trouble diagnosis for DTC P0607. Refer
to EC-378, "
DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
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 wheel s 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 >> Proceed to EC-449, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006288354
1.CHECK DTC WITH TCM
Check DTC with TCM. Refer to TM-61, "
CONSULT-III Function (TRANSMISSION)".
Is the inspection result normal?
YES >> GO TO 2.
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P1574 ASCD VHL SPD SEN
(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.)
Combination meter
ABS actuator and electric unit (control unit)
Wheel sensor
TCM
ECM
Revision: 2010 May2011 QX56

Page 2474 of 5598

INFINITI QX56 2011 Factory Service Manual
EC-450
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P1574 ICC VEHICLE SPEED SENSOR
NO >> Perform Diagnosis Procedure corresponding to the DTC indicated.
2.CHECK DTC WITH “ABS ACTUATOR A
ND ELECTRIC UNIT (CONT

Page 2475 of 5598

INFINITI QX56 2011 Factory Service Manual
P1606 VVEL CONTROL MODULEEC-451
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
C
D
E
F
G H
I
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K L
M A
EC
NP
O
P1606 VVEL CONTROL MODULE
DTC LogicINFOID:0000000006217951
DTC DETECTION LOGIC
DTC CONFIRMATION PROC

Page 2476 of 5598

INFINITI QX56 2011 Factory Service Manual
EC-452
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P1607 VVEL CONTROL MODULE
P1607 VVEL CONTROL MODULE
DTC LogicINFOID:0000000006217953
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
1. Turn

Page 2477 of 5598

INFINITI QX56 2011 Factory Service Manual
P1608 VVEL SENSOR POWER SUPPLY
EC-453
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
C
D
E
F
G H
I
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K L
M A
EC
NP
O
P1608 VVEL SENSOR POWER SUPPLY
DTC LogicINFOID:0000000006217955
DTC DETECTION LOGIC
DTC CONFIR

Page 2478 of 5598

INFINITI QX56 2011 Factory Service Manual
EC-454
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P1608 VVEL SENSOR POWER SUPPLY
4. Also check harness for short to ground and power.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.DETECT M

Page 2479 of 5598

INFINITI QX56 2011 Factory Service Manual
P1805 BRAKE SWITCHEC-455
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
C
D
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G H
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K L
M A
EC
NP
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P1805 BRAKE SWITCH
DTC LogicINFOID:0000000006217957
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFOR

Page 2480 of 5598

INFINITI QX56 2011 Factory Service Manual
EC-456
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P1805 BRAKE SWITCH
4.CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect stop lamp switch harness connector.
2. Disconnect ECM harnes

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