Sfi System - Iacv Control Circuit

Brand:

Toyota

Model Name:

4Runner GRN210 215 UZN210 215

Manual:

Repair Manual

Section:

2Uz-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Wiring diagram

  3. Inspection procedure

  4. Perform active test by intelligent tester (vacuum switching valve)

  5. Check vacuum hoses (intake manifold - vacuum switching valve, vacuum switching valve - intake air control valve)

  6. Inspect intake air control valve

  7. Inspect vacuum switching valve (operation)

  8. Check harness and connector (vacuum switching valve - ecm, vacuum switching valve - efi no. 2 fuse)

SFI SYSTEM > IACV 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 4,700 rpm or more and the throttle valve opening angle is 60° or more, the IACV is open (VSV: OFF). At all other times, the IACV is closed (VSV: ON).

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 (VACUUM SWITCHING VALVE)
  1. Disconnect the vacuum hose from port F on the vacuum switching valve (for ACIS). 4Runner

  2. Disconnect the vacuum hose from port F on the vacuum switching valve (for ACIS).

  1. Connect the intelligent tester to the DLC3 with CAN VIM.

  1. Start the engine.

  1. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / INTAKE CTL VSV1. Operate the ACIS VSV.

  1. Check the VSV air flow when switching the VSV.

    OK:
    Tester Condition
    		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


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Go to step 4
OK
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2.CHECK VACUUM HOSES (INTAKE MANIFOLD - VACUUM SWITCHING VALVE, VACUUM SWITCHING VALVE - INTAKE AIR CONTROL VALVE)

  1. Check the condition of the vacuum hoses between the intake manifold, vacuum switching valve (for ACIS) and IACV.

    1. The vacuum hoses are connected securely.

    2. The vacuum hoses are not cracked or damaged.

      OK:
      The vacuum hoses are connected securely and not cracked or damaged.


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REPAIR OR REPLACE VACUUM HOSES
OK
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3.INSPECT INTAKE AIR CONTROL VALVE

  1. Inspect the intake air control valve (Click here).



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REPLACE INTAKE AIR CONTROL VALVE
OK
next down
REPLACE ECM

4.INSPECT 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 positive (+) battery voltage across the terminals.

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



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REPLACE VACUUM SWITCHING VALVE
OK
next down

5.CHECK HARNESS AND CONNECTOR (VACUUM SWITCHING VALVE - ECM, VACUUM SWITCHING VALVE - EFI NO. 2 FUSE)
  1. Check the wire harness between the VSV for ACIS and connector the ECM connector.Disconnect the V1 VSV for ACIS connector.Disconnect the E6 and E4 ECM connector.Measure the resistance between the wire harness side connectors.Standard resistance (Check for open):Tester ConnectionSpecified conditionVSV for ACIS (V1-2) - ACIS (E4-33)Below 1 ΩStandard resistance (Check for short):Tester ConnectionSpecified conditionVSV for ACIS (V1-2) or ACIS (E4-33) - E1 (E6-1)10 kΩ or higher 4Runner

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

    1. Disconnect the V1 VSV for ACIS connector.

    2. Disconnect the E6 and E4 ECM connector.

    3. Measure the resistance between the wire harness side connectors.

      Standard resistance (Check for open):
      Tester Connection
      		Specified condition
      VSV for ACIS (V1-2) - ACIS (E4-33)
      		Below 1 Ω
      Standard resistance (Check for short):
      Tester Connection
      		Specified condition
      VSV for ACIS (V1-2) or ACIS (E4-33) - E1 (E6-1)
      		10 kΩ or higher

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

    1. Disconnect the V14 VSV for ACIS connector.

    2. Remove the EFI relay from the engine room relay block.

    3. Measure the resistance between the wire harness side connectors.

      Standard resistance (Check for open):
      Tester Connection
      		Specified condition
      VSV for ACIS (V1-1) - EFI relay terminal 3 of R/B
      		Below 1 Ω


NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down
REPLACE ECM