Brand:

Toyota

Model Name:

4Runner GRN210 215 UZN210 215

Manual:

Repair Manual

Section:

1Gr-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Wiring diagram

  3. Inspection procedure

  4. Perform active test by intelligent tester (operate vsv for acis)

  5. Check vacuum switching valve (operation)

  6. Check harness and connector (vsv for acis - ecm, vsv for acis - efi relay)

  7. Check vacuum hoses

  8. Inspect intake air control valve (intake air surge tank)

SFI SYSTEM > ACIS Control Circuit


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DESCRIPTION

This circuit opens and closes the Intake Air Control Valve (IACV) in response to the engine load in order to increase the intake efficiency (ACIS: Acoustic Control Induction System).
When the engine speed is between 2,200 and 4,100 rpm and the throttle valve opening angle is 60° or more, the ECM supplies current to the VSV (ON status), so the IACV will close. Besides that condition, the VSV is usually OFF and the IACV is open.

Sfi System - Cranking Holding Function Circuit 4Runner


WIRING DIAGRAM


Sfi System - Cranking Holding Function Circuit 4Runner


INSPECTION PROCEDURE

1.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE VSV FOR ACIS)
  1. Disconnect the vacuum hose. 4Runner

  2. Disconnect the vacuum hose.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the intelligent tester ON.

  1. Select the item: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / INTAKE CTL VSV1. Operate the VSV for AICS.

  1. Check the VSV operation when it is operated using the intelligent tester.

    Standard:
    Tester Operation
    		Specified Condition
    VSV is ON
    		Air from port E flows out through port F
    VSV is OFF
    		Air from port E flows out through the air filter

  1. Reconnect the vacuum hose.



OKnext
Go to step 4
NG
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2.CHECK VACUUM SWITCHING VALVE (OPERATION)
  1. Check that air flows from port E to the air filter. 4Runner

  2. Check that air flows from port E to the air filter.

  1. Apply battery voltage across the terminals. 4Runner

  2. Apply battery voltage across the terminals.

  1. Check that air flows from port E to port F.



NGnext
REPLACE VACUUM SWITCHING VALVE
OK
next down

3.CHECK HARNESS AND CONNECTOR (VSV FOR ACIS - ECM, VSV FOR ACIS - EFI RELAY)
  1. Check the wire harness and connectors between the VSV for ACIS and ECM.Disconnect the V1 VSV for ACIS connector.Disconnect the E4 ECM connector.Measure the resistance between the terminals of the VSV for ACIS connector and ECM connector.Standard resistance (Check for open):Tester ConnectionsSpecified ConditionsVSV for ACIS (V1-1) - ACIS (E4-33)Below 1 ΩStandard resistance (Check for short):Tester ConnectionsSpecified ConditionsVSV for ACIS (V1-1) or ACIS (E4-33) - E1 (E6-1)10 kΩ or higherReconnect the VSV for ACIS connector.Reconnect the ECM connector. 4Runner

  2. Check the wire harness and connectors between the VSV for ACIS and ECM.

    1. Disconnect the V1 VSV for ACIS connector.

    2. Disconnect the E4 ECM connector.

    3. Measure the resistance between the terminals of the VSV for ACIS connector and ECM connector.

      Standard resistance (Check for open):
      Tester Connections
      		Specified Conditions
      VSV for ACIS (V1-1) - ACIS (E4-33)
      		Below 1 Ω
      Standard resistance (Check for short):
      Tester Connections
      		Specified Conditions
      VSV for ACIS (V1-1) or ACIS (E4-33) - E1 (E6-1)
      		10 kΩ or higher

    4. Reconnect the VSV for ACIS connector.

    5. Reconnect the ECM connector.

  1. Check the wire harness between the VSV for ACIS and EFI relay.

    1. Disconnect the V1 VSV for ACIS connector.

    2. Remove the EFI fuse from the engine room R/B and J/B.

    3. Measure the resistance of the VSV for ACIS connector and engine room R/B (EFI fuse).

      Standard resistance (Check for open):
      Tester Connections
      		Specified Conditions
      VSV for ACIS (V1-1) - EFI relay (3)
      		Below 1 Ω

    4. Reconnect the VSV for ACIS connector.

    5. Reinstall the EFI fuse.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down

4.CHECK VACUUM HOSES

  1. Check that the vacuum hose is connected correctly.

  1. Check the vacuum hose for looseness and disconnection.

  1. Check the vacuum hose for cracks, holes and damage.



NGnext
REPAIR OR REPLACE VACUUM HOSES
OK
next down

5.INSPECT INTAKE AIR CONTROL VALVE (INTAKE AIR SURGE TANK)


NGnext
REPLACE INTAKE AIR SURGE TANK
OK
next down
REPLACE ECM