Infiniti Q45. Manual — part 494

DTC P1574 ASCD VEHICLE SPEED SENSOR

EC-615

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Diagnostic Procedure

NBS0024X

1.

CHECK DTC WITH TCM

Check DTC with TCM. Refer to

AT-38, "ON BOARD DIAGNOSTIC (OBD) SYSTEM"

.

OK or NG

OK

>> GO TO 2.

NG

>> Perform trouble shooting relevant to DTC indicated.

2.

CHECK DTC WITH VDC/TCS/ABS CONTROL UNIT

Refer to

BRC-10, "TROUBLE DIAGNOSIS"

.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace.

3.

CHECK COMBINATION METER

Refer to

DI-7, "COMBINATION METERS"

.

>> INSPECTION END

EC-616

DTC P1715 INPUT SPEED SENSOR (TURBINE REVOLUTION SENSOR)

DTC P1715 INPUT SPEED SENSOR (TURBINE REVOLUTION SENSOR)

PFP:31935

Description

NBS00255

ECM receives turbine revolution sensor signal from TCM through CAN communication line. ECM uses this
signal for engine control.

CONSULT-II Reference Value in Data Monitor Mode

NBS00256

Specification data are reference values.

On Board Diagnosis Logic

NBS00257

NOTE:

●

If DTC P1715 is displayed with DTC U1000, U1001 first perform the trouble diagnosis for DTC
U1000, U1001. Refer to

EC-156, "DTC U1000, U1001 CAN COMMUNICATION LINE"

.

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If DTC P1715 is displayed with DTC U1010 first perform the trouble diagnosis for DTC U1010. Refer
to

EC-159, "DTC U1010 CAN COMMUNICATION"

.

●

If DTC P1715 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605.
Refer to

EC-489, "DTC P0605 ECM"

.

●

If DTC P1715 is displayed with DTC P0335, first perform the trouble diagnosis for DTC P0335.
Refer to

EC-370, "DTC P0335 CKP SENSOR (POS)"

.

●

If DTC P1715 is displayed with DTC P0340, first perform the trouble diagnosis for DTC P0340.
Refer to

EC-379, "DTC P0340 CMP SENSOR (PHASE)"

.

The MIL will not lights up for this diagnosis.

Diagnostic Procedure

NBS00258

1.

CHECK DTC WITH TCM

Check DTC with TCM. Refer to

AT-38, "ON BOARD DIAGNOSTIC (OBD) SYSTEM"

.

OK or NG

OK

>> GO TO 2.

NG

>> Perform trouble shooting relevant to DTC indicated.

2.

REPLACE TCM

Replace TCM. Refer to

AT-42, "TROUBLE DIAGNOSIS"

.

>> INSPECTION END

MONITOR ITEM

CONDITION

SPECIFICATION

I/P PULLY SPD

●

Vehicle speed: More than 20 km/h (12MPH)

Almost the same speed as the
tachometer indication

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1715
1715

Input speed sensor
(Turbine revolution sen-
sor)
(TCM output)

Turbine revolution sensor signal is differ-
ent from the theoretical value calculated
by ECM from revolution sensor signal
and engine rpm signal.

●

Harness or connectors
(The CAN communication line is open or
shorted)

●

Harness or connectors
(Turbine revolution sensor circuit is open or
shorted)

●

TCM

DTC P1800 VIAS CONTROL SOLENOID VALVE

EC-617

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DTC P1800 VIAS CONTROL SOLENOID VALVE

PFP:14955

Component Description

NBS0025I

The VIAS control solenoid valve cuts the intake manifold vacuum
signal for power valve actuator. It responds to ON/OFF signals from
the ECM. When the solenoid is off, the vacuum signal from the
intake manifold is cut. When the ECM sends an ON signal the coil
pulls the plunger downward and feeds the vacuum signal to the
power valve actuator.

CONSULT-II Reference Value in Data Monitor Mode

NBS0025J

Specification data are reference values.

On Board Diagnosis Logic

NBS0025K

The MIL will not light up for this self-diagnosis.

DTC Confirmation Procedure

NBS0025L

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:
Before performing the following procedure, confirm that battery voltage is between 11V at idle.

WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Start engine and let it idle for at least 5 seconds.

4.

If 1st trip DTC is detected, go to

EC-619, "Diagnostic Procedure"

.

WITH GST

Follow the procedure “WITH CONSULT-II” above.

PBIB2421E

MONITOR ITEM

CONDITION

SPECIFICATION

VIAS S/V

●

Selector lever: P or N

ON

●

Engine speed: More than 5,000 rpm

●

Selector lever: Except P or N

●

Engine speed: Less than 5,000 rpm

OFF

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1800
1800

VIAS control solenoid valve cir-
cuit

An excessively low or high voltage signal
is sent to ECM through the valve

●

Harness or connectors
(The solenoid valve circuit is open or
shorted.)

●

VIAS control solenoid valve

SEF058Y

EC-618

DTC P1800 VIAS CONTROL SOLENOID VALVE

Wiring Diagram

NBS0025M

TBWM1263E