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Home >> Toyota >> 2005 >> Tundra Base, 4.0 U, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine (1GR-FE) - Diagnostics >> Circuit Inspection >> Cranking Holding Function Control Circuit >> Inspection Procedure

Inspection Procedure

  1. Check operation of engine cranking. 

    CHECK: 

    When turning the ignition switch to the START position, check whether the starter motor starts.

    OK: 

    1. Engine is cranked. 
    1. OK:  CHECK FOR INTERMITTENT PROBLEMS   . 
    2. NG: Go To Next Step. 
  2. Connect hand-held tester, and check STA signal. 

    PREPARATION: 

    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch to ON, and push the hand-held tester main switch ON.
    3. On the hand-held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST /ALL/ STARTER SIG.

    CHECK: 

    Read the STA signal on the hand-held tester while the starter operates.

    OK: 

    1. Standard: 
    IGNITION SWITCH POSITION

    Ignition Switch Position ON START
    STARTER SIG OFF ON
    1. NG: Repair or replace harness or connector. 
    2. OK: Go To Next Step. 
  3. Check voltage between terminals STSW and STAR/NSW of ECM connector. 
    Fig 1: Identifying Terminals Of E6 And E5 ECM Connectors
    G02648143Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage between the terminals of the E6 and E5 ECM connectors, while cranking the engine (ignition switch START position).
      1. Standard: 
    TESTER CONNECTION SPECIFIED CONDITION

    Symbols (Terminal No.) Specified condition
    NSW(E6-8)-E1 (E5-1) 9 to 14 V
    STSW(E5-12)-E1 (E5-1) 9 to 14 V
    1. Result: 
    RESULT REFERENCE

    Terminal STAR Terminal STSW Proceed to
    9 to 14 V 9 to 14 V A
    OV 9 to 14 V B
    OV OV C
    1. B: Replace  ENGINE CONTROL MODULE (ECM)  . 
    2. C: Go to step   8 . 
    3. A: Go To Next Step. 
  4. Check park/neutral position switch assembly. 
    Fig 2: Identifying Park/Neutral Position Switch Connector
    G02648144Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the park/neutral position switch connector.
    2. Check for resistance between each terminal shown below when the shift lever is moved to each range.
      1. Standard: 
    TERMINAL SPECIFIED CONDITION

    Shift range Terminal No. Specified condition
    P 1 -3 6-9 Below 1 Ω
    R 2-3 Below 1 Ω
    N 3-5 6-9 Below 1 Ω
    D 3-7 Below 1 Ω
    3 3-4 Below 1 Ω
    2, L 3-8 Below 1 Ω
    1. NG: Check and repair harness and connector. 
    2. OK: Go To Next Step. 
  5. Check starter relay. 
    Fig 3: Identifying Starter Relay
    G02648145Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the starter relay from the engine room R/B.
    2. Inspect the starter relay.
    1. Standard: 
    TESTER CONNECTION SPECIFIED CONDITION

    Terminal No. Specified condition
    3-5 10 KΩ or higher
    3-5 Below 1 Ω (Apply battery voltage terminals 1 and 2)
    1. NG: Replace starter relay. 
    2. OK: Go To Next Step. 
  6. Check harness and connector park/neutral position switch and starter relay. 
    Fig 4: Identifying Park/ Neutral Position Switch Connector
    G02648146Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Check the harness and the connector between the park/ neutral position switch connector and the starter relay.
      1. Disconnect the park/neutral position switch connector.
      2. Remove the starter relay from the engine room R/B.
      3. Check for resistance between the wire harness side connectors.
      1. Standard (Check for open): 
        TESTER CONNECTION SPECIFIED CONDITION STANDARD (CHECK FOR OPEN)

        Symbols (Terminal No.) Specified condition
        Park/Neutral position switch (N1-6) - Starter relay (1) Below 1 Ω
      2. Standard (Check for short): 
      TESTER CONNECTION SPECIFIED CONDITION STANDARD (CHECK FOR SHORT)

      Symbols (Terminal No.) Specified condition
      Park/Neutral position switch (N1-6) or Starter relay (1) - Body ground 10 KΩ or higher
    2. Check the harness and the connector between the starter relay and the body ground.
      1. Remove the starter relay from the engine room R/B.
      2. Check for resistance between the starter relay and the body ground.
      1. Standard (Check for open): 
    TESTER CONNECTION SPECIFIED CONDITION STANDARD (CHECK FOR OPEN)

    Symbols (Terminal No.) Specified condition
    Starter relay (2) - Body ground Below 1 Ω
    Fig 5: Removing Starter Relay From Engine Room R/B
    G02648147Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: Repair or replace harness or connector. 
    2. OK: Go To Next Step. 
  7. Check starter assembly (See  TEST  (1.6 kw) or  TEST  (2.0 kw)) 
    1. NG: Replace starter assembly. 
    2. OK: Go To Next Step. 
  8. Check STA fuse. 
    Fig 6: Removing Starter Relay From Engine Room R/B
    G02648148Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the starter relay from the engine room R/B.
    2. Measure the voltage between the terminal of the engine room R/B and the body ground.
      1. Standard: 
    TESTER CONNECTION SPECIFIED CONDITION

    Symbols (Terminal No.) Specified condition
    Starter relay (5) - Body ground 9 to 14 V
    1. NG: Check for short in all harness and components connected to STA fuse, and replace fuse. 
    2. OK: Go To Next Step. 
  9. Check ignition switch. 
    Fig 7: Identifying Ignition Switch Connector
    G02648149Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Check for resistance between the connector terminals shown in the chart below.
      1. Standard: 
    TERMINAL SPECIFIED CONDITION

    Switch position Terminal No. Specified condition
    LOCK All terminal to terminal 10 KΩ or higher
    ACC 2-3 Below 1 Ω
    ON 2-3,2-4,3-4 6-7 Below 1 Ω
    START 1 -2, 1 -4, 2-4 6-7,6-8,7-8 Below 1 Ω
    1. NG: Replace ignition switch. 
    2. OK: Check and repair harness and connector. 
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