Sfi System - Cranking Holding Function 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. Check operation of engine cranking

  5. Read value of intelligent tester (sta signal)

  6. Inspect ecm (sta and stsw voltage)

  7. Inspect park / neutral position switch

  8. Inspect starter relay

  9. Check harness and connector (park / neutral position switch - starter relay, starter relay - body ground)

  10. Inspect engine room relay block (starter relay voltage)

  11. Inspect starter assembly

  12. Inspect ignition switch assembly

SFI SYSTEM > Cranking Holding Function Circuit


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DESCRIPTION

The starter is controlled by the ECM. When the ECM detects a start signal (STSW) from the ignition switch, this system monitors the engine speed (NE) and continues to operate the starter until it has determined that the engine has started (engine speed reaches approximately 500 rpm). If the engine is already running and the ignition switch is turned to START, the ECM will not operate the starter.

When turning the ignition switch to the START position check if the starter motor starts. 4Runner


WIRING DIAGRAM


When turning the ignition switch to the START position check if the starter motor starts. 4Runner


INSPECTION PROCEDURE

1.CHECK OPERATION OF ENGINE CRANKING

  1. When turning the ignition switch to the START position check if the starter motor starts.



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CHECK FOR INTERMITTENT PROBLEMS
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2.READ VALUE OF INTELLIGENT TESTER (STA SIGNAL)

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

  1. Enter the following menu: DIAGNOSIS / ENHANCED OBDII / DATA LIST / PRIMARY / STARTER SIG.

  1. Confirm the starter signal status when the ignition switch is operated.

    OK:

    Ignition Switch Position
    		STARTER SIG
    ON
    		OFF
    Start
    		ON


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Go to step 5
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3.INSPECT ECM (STA AND STSW VOLTAGE)
  1. Measure the voltage of the E6 ECM connector while cranking the engine (ignition switch is in the START position).Standard voltage:Tester ConnectionSpecified ConditionSTA (E6-11) - E1 (E6-1)9 to 14 VSTSW (E6-12) - E1 (E6-1) Result:Terminal STSWTerminal STAProceed to9 to 14 V9 to 14 VA0 VB 0 VC 4Runner

  2. Measure the voltage of the E6 ECM connector while cranking the engine (ignition switch is in the START position).

    Standard voltage:
    Tester Connection
    		Specified Condition
    STA (E6-11) - E1 (E6-1)
    		9 to 14 V
    STSW (E6-12) - E1 (E6-1)

    Result:

    Terminal STSW
    		Terminal STA
    		Proceed to
    9 to 14 V
    		9 to 14 V
    		A
    0 V
    		B
    0 V
    		C


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REPLACE ECM

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Go to step 9
A
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4.INSPECT PARK / NEUTRAL POSITION SWITCH
  1. Disconnect the P1 park / neutral position switch connector. 4Runner

  2. Disconnect the P1 park / neutral position switch connector.

  1. Measure the resistance between each terminal shown below when the shift lever is moved to each position.

    Standard resistance:
    Shift Position
    		Tester Connection
    		Specified Condition
    P
    		2 - 6, 4 - 5
    		Below 1 Ω
    R
    		1 - 2
    N
    		2 - 9, 4 - 5
    D
    		2 - 7
    2
    		2 - 3
    L
    		2 - 8

  1. Reconnect the park / neutral position switch connector.



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REPLACE PARK / NEUTRAL POSITION SWITCH
OK
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CHECK AND REPAIR HARNESS OR CONNECTOR (PARK / NEUTRAL POSITION SWITCH - ECM)

5.INSPECT STARTER RELAY
  1. Remove the starter relay from the engine room relay block. 4Runner

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

  1. Measure the resistance of the starter relay.

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

  1. Reinstall the starter relay.



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REPLACE STARTER RELAY
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6.CHECK HARNESS AND CONNECTOR (PARK / NEUTRAL POSITION SWITCH - STARTER RELAY, STARTER RELAY - BODY GROUND)
  1. Check the harness and the connector between the park / neutral position switch connector and the starter relay.Disconnect the P1 park/neutral position switch connector.Remove the starter relay from the engine room relay block.Measure the resistance between the wire harness side connectors.Standard resistance (Check for open):Tester ConditionSpecified conditionPark/Neutral position switch (P1-6) - Starter relay (1)Below 1 ΩStandard resistance (Check for short):Tester ConditionSpecified conditionPark/Neutral position switch (P1-6) or Starter relay (1) Body ground10 kΩ or higherReinstall the starter relay.Reconnect the park/neutral position switch. 4Runner

  2. Check the harness and the connector between the park / neutral position switch connector and the starter relay.

    1. Disconnect the P1 park/neutral position switch connector.

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

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

      Standard resistance (Check for open):
      Tester Condition
      		Specified condition
      Park/Neutral position switch (P1-6) - Starter relay (1)
      		Below 1 Ω
      Standard resistance (Check for short):
      Tester Condition
      		Specified condition
      Park/Neutral position switch (P1-6) or Starter relay (1) Body ground
      		10 kΩ or higher

    4. Reinstall the starter relay.

    5. Reconnect the park/neutral position switch.

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

    1. Remove the starter relay from the engine room relay block.

    2. Measure the resistance between the starter relay and the body ground.

      Standard resistance (Check for open):
      Tester Condition
      		Specified condition
      Starter relay (2) - Body ground
      		Below 1 Ω


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REPAIR OR REPLACE HARNESS OR CONNECTOR
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7.INSPECT ENGINE ROOM RELAY BLOCK (STARTER RELAY VOLTAGE)
  1. Remove the Starter relay from the engine room relay block. 4Runner

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

  1. Measure the voltage of the engine room relay block and body ground.

    Standard voltage:
    Tester Connection
    		Specified Condition
    Engine room relay block (Starter relay terminal 5) - Body ground
    		9 to 14 V

  1. Reinstall the Starter relay.



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CHECK AND REPAIR HARNESS AND CONNECTOR (STARTER RELAY - BATTERY)
OK
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8.INSPECT STARTER ASSEMBLY

  1. Inspect the starter assembly (Click here).



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REPAIR OR REPLACE STARTER ASSEMBLY
OK
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CHECK AND REPAIR HARNESS OR CONNECTOR (STARTER RELAY - STARTER, STARTER - BATTERY)

9.INSPECT IGNITION SWITCH ASSEMBLY
  1. Remove the lower finish panel. 4Runner

  2. Remove the lower finish panel.

  1. Disconnect the I18 ignition switch connector.

  1. Measure the resistance of the connector terminals shown in the chart below.

    Standard resistance:
    Switch Position
    		Tester Connection
    		Specified Condition
    LOCK
    		All terminals
    		10 kΩ or higher
    ACC
    		2 - 3
    		Below 1 Ω
    ON
    		2 - 3
    2 - 4, 6 - 7
    START
    		1 - 2, 2 - 4
    6 - 7, 6 - 8

  1. Reconnect the I18 ignition switch connector.



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