TGE/Troubleshooting 2JZ-GE — VSV Circuit for ACIS, page 98

EG–478

ENGINE – 2JZ–GE ENGINE TROUBLESHOOTING

VSV Circuit for ACIS

CIRCUIT DESCRIPTION

The circuit opens and closes the IACV (Intake Air Control Valve) in response to the engine load in order
to increase the intake efficiency (ACIS: Acoustic Control Induction System).
When the engine speed is 4,500 rpm or less and throttle valve opening angle is 30° or more, or engine
speed is 4,500 rpm or more and throttle valve opening angle is 30° or less, the engine control module
turns the VSV ON and closes the IACV. At all other times, the VSV is OFF, so the IACV is open.

Throttle Valve

IACV
Actuator
VSV

Vacuum
Tank

Engine Speed
ECM
Throttle Valve
Opening Angle

Throttle Valve

FI6612

VSV        IACV
ON         closed
OFF        open

WIRING DIAGRAM

Engine Control Module

B-R    3
        EA3        B-R           2    1  G-Y   39  ACIS
                                              E9
              GR    8
                    EA1
                              VSV for ACIS
                                                    E01
                                                    B+
2    2
                EFI Main Relay
        R/B
        No.2
2    2
                                  GR           24  M-REL
                                              E10
B-Y
2
R/B
No.2
        EFI No.1

        W-B

2A

B
Battery

FI5950