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Home >> Toyota >> 2004 >> Sequoia Limited, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Diagnostics >> Circuit Inspection >> Cranking Hold Function Circuit >> Inspection Procedure >> Hand-held tester:

Hand-held tester:

  1. Check operation of engine cranking. 

    CHECK: 

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

    OK: 

    Starter motor starts. 

    1. OK: Check for intermittent problems (See  PRE-CHECK  ) 
    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 ON, and push the hand-held tester main switch ON.
    3. 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: 

    STA SIGNAL CHECK

    Ignition Switch Position ON START
    STA Signal OFF ON
    1. NG: Go to step   5 . 
    2. OK: Go to next step. 
  3. Check voltage between terminal STAR, STSW and E1 of ECM connector. 

    CHECK: 

    Measure the voltage between the terminals of the E6 and E7 ECM connectors, while cranking the engine (ignition switch START position).

    Fig 1: Measuring Voltage Between Terminals
    G02921586Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: 

    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Specified Condition
    STAR (E7-9) - E1 (E6-1) 9 to 14 V
    STSW (E6-12) - E1 (E6-1) 9 to 14 V

    RESULT: 

    ECM CONNECTOR TERMINAL VOLTAGE CHECK

    Terminal STAR Terminal STSW Proceed to
    9 to 14 V 9 to 14 V A
    0 V 9 to 14 V B
    O V 0 V C
    1. B: Replace ECM (See  INSPECTION  ). 
    2. C: Go to step   9 . 
    3. A: Go to next step. 
  4. Check park/neutral position switch. 

    PREPARATION: 

    Remove the P1 park/neutral position switch connector.

    CHECK: 

    Check continuity between each terminal shown below when the shift lever is moved to each range.

    Fig 2: Checking Continuity Between Terminals (1 Of 2)
    G02921588Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 3: Checking Continuity Between Terminals (2 Of 2)
    G02921587Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: 

    There is continuity. 

    1. NG: Replace the park/neutral position switch. 
    2. OK: Check and repair harness and connector between park/neutral position switch and ECM. 
  5. Check starter relay (See  STARTER  ). 
    1. NG: Replace starter relay. 
    2. OK: Go to next step. 
  6. Check for open and short in harness and connector between park/neutral position switch and starter relay, starter relay and body ground (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
    1. NG: Repair or replace harness or connector. 
    2. OK: Go to next step. 
  7. Check engine room R/B No.2 (Starter relay voltage). 

    PREPARATION: 

    Remove the starter relay from the engine room R/B No.2.

    CHECK: 

    Measure the voltage between the terminal of the engine room R/B and body ground.

    Fig 4: Measuring Voltage Between Terminal
    G02921589Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: 

    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Specified Condition
    Starter relay (5) - Body ground 9 to 14 V
    1. NG: Check and repair harness and connector between starter relay and battery. 
    2. OK: Go to next step. 
  8. Check starter (See  STARTER  ). 
    1. NG: Repair or replace starter. 
    2. OK: Go to next step. 
  9. Check ignition switch. 

    PREPARATION: 

    1. Remove the lower finish panel.
    2. Disconnect the ignition switch connector.

    CHECK: 

    Check continuity between terminals shown below.

    Fig 5: Checking Continuity Between Terminals (1 Of 2)
    G02921591Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 6: Checking Continuity Between Terminals (2 Of 2)
    G02921590Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: 

    1. NG: Replace ignition switch. 
    2. OK: Check for open in harness and connector between ECM and ignition switch, ignition switch and battery (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
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