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. Inspect ecm (+b voltage)

  5. Check harness and connector (ecm - body ground)

  6. Inspect ecm (igsw voltage)

  7. Check fuse (ign fuse)

  8. Inspect ignition or starter switch assembly

  9. Inspect ecm (mrel voltage)

  10. Check fuse (efi fuse)

  11. Inspect efi relay (efi relay)

  12. Check harness and connector (efi relay - ecm, efi relay - body ground)

SFI SYSTEM > ECM Power Source Circuit


​

DESCRIPTION

When the ignition switch is turned on, the battery voltage is applied to terminal IGSW of the ECM. The ECM MREL output signal causes a current to flow to the coil, closing the contacts of the EFI relay and supplying power to terminal +B of the ECM.
If the ignition switch is turned off, the ECM holds the EFI relay ON for a maximum of 2 seconds to allow for the initial setting of the throttle valve.

WIRING DIAGRAM


Sfi System - Evap System 4Runner


INSPECTION PROCEDURE

1.INSPECT ECM (+B VOLTAGE)
  1. Turn the ignition switch on. 4Runner

  2. Turn the ignition switch on.

  1. Measure the voltage between the terminals of the A24 and B47 ECM connectors.

    Standard voltage:
    Tester Connections
    		Specified Conditions
    +B (E8-1) - E1 (E6-1)
    		9 to 14 V


OKnext
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG
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2.CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)
  1. Disconnect the E6 ECM connector. 4Runner

  2. Disconnect the E6 ECM connector.

  1. Measure the resistance between the terminal of the ECM connector and body ground.

    Standard resistance (Check for open):
    Tester Connections
    		Specified Conditions
    E1 (E6-1) - Body ground
    		Below 1 Ω

  1. Reconnect the ECM connector.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down

3.INSPECT ECM (IGSW VOLTAGE)
  1. Turn the ignition switch on. 4Runner

  2. Turn the ignition switch on.

  1. Measure the voltage between the terminals of the E6 and E8 ECM connectors.

    Standard voltage:
    Tester Connections
    		Specified Conditions
    IGSW (E8-9) - E1 (E6-1)
    		9 to 14 V


OKnext
Go to step 6
NG
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4.CHECK FUSE (IGN FUSE)
  1. Remove the IGN fuse from the driver side J/B. 4Runner

  2. Remove the IGN fuse from the driver side J/B.

  1. Measure the IGN fuse resistance.

    Standard resistance:
    Below 1 Ω

  1. Reinstall the IGN fuse.



NGnext
CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK
next down

5.INSPECT IGNITION OR STARTER SWITCH ASSEMBLY
  1. Disconnect the I18 ignition switch connector. 4Runner

  2. Disconnect the I18 ignition switch connector.

  1. Check the resistance.

    Standard resistance:
    Ignition Switch Positions
    		Tester Conditions
    		Specified Conditions
    LOCK
    		All Terminals
    		10 kΩ or higher
    ACC
    		2-4
    		Below 1 Ω
    ON
    		1-2, 1-4, 5-6
    		Below 1 Ω
    START
    		1-3, 1-4, 3-4, 5-6, 5-7, 6-7
    		Below 1 Ω

  1. Reconnect the ignition switch connector.



NGnext
REPLACE IGNITION OR STARTER SWITCH ASSEMBLY
OK
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CHECK HARNESS AND CONNECTOR (BATTERY - IGNITION SWITCH, IGNITION SWITCH - ECM)

6.INSPECT ECM (MREL VOLTAGE)
  1. Turn the ignition switch on. 4Runner

  2. Turn the ignition switch on.

  1. Measure the voltage between the terminals of the E6 and E8 ECM connectors.

    Standard voltage:
    Tester Connections
    		Specified Conditions
    MREL (E8-8) - E1 (E6-1)
    		9 to 14 V


NGnext
REPLACE ECM
OK
next down

7.CHECK FUSE (EFI FUSE)
  1. Remove the EFI fuse from the engine room R/B. 4Runner

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

  1. Measure the EFI fuse resistance.

    Standard resistance:
    Below 1 Ω

  1. Reinstall the EFI fuse.



NGnext
CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK
next down

8.INSPECT EFI RELAY (EFI RELAY)
  1. Remove the EFI relay from the engine room R/B. 4Runner

  2. Remove the EFI relay from the engine room R/B.

  1. Check the EFI relay resistance.

    Standard resistance:
    Tester Connections
    		Specified Conditions
    3 - 5
    		10 kΩ or higher
    3 - 5
    		Below 1 Ω
    (when battery voltage applied to terminals 1 and 2)

  1. Reinstall the EFI relay.



NGnext
REPLACE EFI RELAY
OK
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9.CHECK HARNESS AND CONNECTOR (EFI RELAY - ECM, EFI RELAY - BODY GROUND)
  1. Check the harness and connector between the EFI relay and ECM.Remove the EFI relay from the engine room R/B.Disconnect the E8 ECM connector.Measure the resistance between the terminals of the ECM connector and EFI relay terminal.Standard resistance (Check for open):Tester ConnectionsSpecified ConditionsEFI relay (1)- MREL (E8-8)Below 1 ΩStandard resistance (Check for short):Tester ConnectionsSpecified ConditionsEFI relay (1) or MREL (E8-8) - Body ground10 kΩ or higher 4Runner

  2. Check the harness and connector between the EFI relay and ECM.

    1. Remove the EFI relay from the engine room R/B.

    2. Disconnect the E8 ECM connector.

    3. Measure the resistance between the terminals of the ECM connector and EFI relay terminal.

      Standard resistance (Check for open):
      Tester Connections
      		Specified Conditions
      EFI relay (1)- MREL (E8-8)
      		Below 1 Ω
      Standard resistance (Check for short):
      Tester Connections
      		Specified Conditions
      EFI relay (1) or MREL (E8-8) - Body ground
      		10 kΩ or higher

  1. Check the harness and connector between the EFI relay and body ground.

    1. Measure the resistance between the terminal of the EFI relay and body ground.

      Standard resistance (Check for open):
      Tester Connections
      		Specified Conditions
      EFI relay (2) - Body ground
      		Below 1 Ω

    2. Reinstall the EFI relay.

    3. Reconnect the ECM connector.



OKnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
NG
next down
CHECK AND REPLACE HARNESS AND CONNECTOR (TERMINAL +B OF ECM - BATTERY POSITIVE TERMINAL)