Infiniti M45 (Y34). Manual - part 474

 

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Infiniti M45 (Y34). Manual - part 474

 

 

DTC P1490 VACUUM CUT VALVE BYPASS VALVE

EC-585

C

D

E

F

G

H

I

J

K

L

M

A

EC

DTC Confirmation Procedure

ABS002RK

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 more than 11V at idle.

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Start engine and wait at least 5 seconds.

4.

If 1st trip DTC is detected, go to 

EC-587, "Diagnostic Procedure"

.

 WITH GST

Follow the procedure WITH CONSULT-II above.

SEF058Y

EC-586

DTC P1490 VACUUM CUT VALVE BYPASS VALVE

Wiring Diagram

ABS002RL

TBWA0310E

DTC P1490 VACUUM CUT VALVE BYPASS VALVE

EC-587

C

D

E

F

G

H

I

J

K

L

M

A

EC

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

Diagnostic Procedure

ABS002RM

1. 

INSPECTION START

Do you have CONSULT-II?
Yes or No

Yes

>> GO TO 2.

No

>> GO TO 3.

2. 

CHECK VACUUM CUT VALVE BYPASS VALVE CIRCUIT

 With CONSULT-II

1.

Turn ignition switch OFF and then ON.

2.

Select “VC/V BYPASS/V” in “ACTIVE TEST” mode with CON-
SULT-II.

3.

Touch “ON/OFF” on CONSULT-II screen.

4.

Make sure that clicking sound is heard from the vacuum cut
valve bypass valve.

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 3.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

43

G/Y

Vacuum cut valve 
bypass valve

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

PBIB0157E

EC-588

DTC P1490 VACUUM CUT VALVE BYPASS VALVE

3. 

CHECK VACUUM CUT VALVE BYPASS VALVE POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect vacuum cut valve bypass valve harness connector.

3.

Turn ignition switch ON.

4.

Check voltage between vacuum cut valve bypass valve terminal
1 and ground with CONSULT-II or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4. 

DETECT MALFUNCTIONING PART

Check the following.

Harness connectors B401, B251

Harness connectors B204, E224

Fuse, fusible link and relay block (J/B) connector E3

10A fuse

Harness for open or short between vacuum cut valve bypass valve and fuse

>> Repair open circuit or short to ground or short to power in harness or connectors.

5. 

CHECK VACUUM CUT VALVE BYPASS VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between ECM terminal 43 and vacuum cut valve bypass valve terminal 2.
Refer to Wiring Diagram.

4.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

Voltage: Battery voltage

PBIB0026E

PBIB0158E

Continuity should exist.

 

 

 

 

 

 

 

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