Infiniti M45 (Y34). Manual - part 477

DTC P1491 VACUUM CUT VALVE BYPASS VALVE

EC-597

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7. 

CHECK BYPASS HOSE

Check bypass hoses for clogging.

OK or NG

OK

>> GO TO 8.

NG

>> Repair or replace hoses.

8. 

CHECK VACUUM CUT VALVE BYPASS VALVE

Refer to 

EC-598, "Component Inspection"

 .

OK or NG

OK

>> GO TO 9.

NG

>> Replace vacuum cut valve bypass valve.

9. 

CHECK VACUUM CUT VALVE

Refer to 

EC-598, "Component Inspection"

 .

OK or NG

OK

>> GO TO 10.

NG

>> Replace vacuum cut valve.

10. 

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR HOSE

1.

Turn ignition switch OFF.

2.

Check disconnection or improper connection of hose connected to EVAP control system pressure sensor.

OK or NG

OK

>> GO TO 11.

NG

>> Repair or replace.

11. 

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR

1.

Disconnect EVAP control system pressure sensor harness connector.

2.

Check connectors for water.

OK or NG

OK

>> GO TO 12.

NG

>> Replace EVAP control system pressure sensor.

12. 

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-369, "Component Inspection"

 .

OK or NG

OK

>> GO TO 13.

NG

>> Replace EVAP control system pressure sensor.

13. 

CHECK RUBBER TUBE FOR CLOGGING

1.

Disconnect rubber tube connected to EVAP canister vent control valve.

2.

Check the rubber tube for clogging.

OK or NG

OK

>> GO TO 14.

NG

>> Clean the rubber tube using an air blower.

Water should not exist.

EC-598

DTC P1491 VACUUM CUT VALVE BYPASS VALVE

14. 

CHECK EVAP CANISTER VENT CONTROL VALVE

Refer to 

EC-564, "Component Inspection"

 .

OK or NG

OK

>> GO TO 15.

NG

>> Replace EVAP canister vent control valve.

15. 

CHECK REFUELING EVAP VAPOR CUT VALVE

Refer to 

EC-701, "Component Inspection"

 .

OK or NG

OK

>> GO TO 16.

NG

>> Replace fuel tank.

16. 

CHECK REFUELING CONTROL VALVE

Refer to 

EC-701, "Component Inspection"

 .

OK or NG

OK

>> GO TO 17.

NG

>> Replace fuel tank.

17. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

ABS002RW

VACUUM CUT VALVE BYPASS VALVE

 With CONSULT-II

1.

Reconnect all harness connectors disconnected.

2.

Turn ignition switch ON.

3.

Perform “VC/V BYPASS/V” in “ACTIVE TEST” mode.

4.

Check air passage continuity and operation delay time under the
following conditions.

Operation takes less than 1 second.

 With GST

Check air passage continuity and operation delay time under the fol-
lowing conditions.

Operation takes less than 1 second.

Condition

VC/V BYPASS/V

Air passage continuity 

between A and B

ON

Yes

OFF

No

PBIB0159E

Condition

Air passage continuity 

between A and B

12V direct current supply between 
terminals 1 and 2

Yes

No supply

No

PBIB0160E

DTC P1491 VACUUM CUT VALVE BYPASS VALVE

EC-599

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VACUUM CUT VALVE

Check vacuum cut valve as follows:

●

Plug port C  and D  with fingers.

●

Apply vacuum to port A  and check that there is no suction from
port B .

●

Apply vacuum to port B  and check that there is suction from
port A .

●

Blow air in port B  and check that there is a resistance to flow out
of port A .

●

Open port C  and D .

●

Blow air in port A  check that air flows freely out of port C .

●

Blow air in port B  check that air flows freely out of port D .

SEF379Q

EC-600

DTC P1706 PNP SWITCH

DTC P1706 PNP SWITCH

PFP:32006

Component Description

ABS002RX

When the selector lever position is P or N, park/neutral position (PNP) switch is ON.
ECM detects the position because the continuity of the line (the ON signal) exists.

CONSULT-II Reference Value in Data Monitor Mode

ABS002RY

Specification data are reference values.

On Board Diagnosis Logic

ABS002RZ

DTC Confirmation Procedure

ABS002S0

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.

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Select “P/N POSI SW” in “DATA MONITOR” mode with CON-
SULT-II. Then check the “P/N POSI SW” signal under the follow-
ing conditions.

If NG, go to 

EC-603, "Diagnostic Procedure"

 .

If OK, go to following step.

3.

Select “DATA MONITOR” mode with CONSULT-II.

4.

Start engine and warm it up to normal operating temperature.

5.

Maintain the following conditions for at least 60 consecutive sec-
onds.

6.

If 1st trip DTC is detected, go to 

EC-603, "Diagnostic Procedure"

.

MONITOR ITEM

CONDITION

SPECIFICATION

P/N POSI SW

●

Ignition switch: ON

Selector lever: P or N

ON

Selector lever: Except above

OFF

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1706
1706

Park/neutral position 
switch

The signal of the park/neutral position (PNP) 
switch is not changed in the process of engine 
starting and driving.

●

Harness or connectors
[The park/neutral position (PNP) switch 
circuit is open or shorted.]

●

Park/neutral position (PNP) switch

●

A/T assembly

●

TCM (Transmission control module)

Position (Selector lever)

Known-good signal

N or P position

ON

Except above position

OFF

ENG SPEED

More than 1,200 rpm

COOLAN TEMP/S

More than 70

°

C (158

°

F)

B/FUEL SCHDL

2.0 - 31 msec

VHCL SPEED SE

More than 64 km/h (40 MPH)

Selector lever

Suitable position

SEF212Y

SEF213Y