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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