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Diagnosis & Repair

WARNING: This page is about a different car, the 2003 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. Retrieve trouble codes. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If only DTC P0505 is displayed, go to next step. If other codes are displayed, diagnose and repair those codes first and retest.
  2. Check for loose, damaged or cracked air intake hose between throttle body and air cleaner. Check for loose or damaged dipstick or oil fill cap. Repair as necessary. If all components are okay, go to next step.
  3. Check connection of PCV hose. Repair or replace as necessary. If okay, go to next step.
  4. Disconnect the throttle control motor connector. Measure the resistance between the terminals No. 1 and 2 of throttle control motor. See Fig 1. If resistance is .3-100 ohms at 68°F (20°C), go to next step. If resistance is not .3-100 ohms at 68°F (20°C), replace throttle body assembly.
    Fig 1: Measuring Resistance At Throttle Control Motor
    G00241631Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. Disconnect T2 throttle control motor 2-pin connector. See Fig 2. Disconnect ECM E2 connector. Check continuity between wire harness side of connectors. See Fig 3. See THROTTLE CONTROL MOTOR/ECM CONTINUITY CHECK  table. If continuity is to specification, go to next step. If continuity is not to specification, repair or replace harness or connector as necessary.
    Fig 2: Identifying Throttle Control Motor 2-Pin Connector Terminals
    G00241632Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 3: Identifying ECM E2 Connector Terminals
    G00241633Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    THROTTLE CONTROL MOTOR/ECM CONTINUITY CHECK

    Terminals No. Specification
    (T2-2) - M+ (E2-3) Continuity
    (T2-1) - M- (E2-2) Continuity
    (T2-2) Or M+ (E2-3) - E1 (E3-7) No Continuity
    (T2-1) Or M- (E2-2) - E1 (E3-7) No Continuity
  6. Disconnect the throttle position sensor connector. Measure resistance between throttle position sensor terminals No. 3 and 6. See Fig 4. Resistance should be 1.25-2.35 ohms at 68°F (20°C). If resistance is to specification, go to next step. If resistance is not to specification, replace throttle position sensor.
    Fig 4: Checking Resistance At Throttle Position Sensor
    G00241634Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. Disconnect T2 throttle position sensor 4-pin connector. See Fig 5. Disconnect ECM E2 connector. Check continuity between the wire harness side connectors. See Fig 6. See THROTTLE POSITION SENSOR/ECM CONTINUITY CHECK  table. If continuity is to specification, go to next step. If continuity is not to specification, repair or replace harness and connector as necessary.
    Fig 5: Identifying Throttle Position Sensor Connector Terminals
    G00241635Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 6: Identifying ECM E2 Connector Terminals
    G00241636Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    THROTTLE POSITION SENSOR/ECM CONTINUITY CHECK

    Terminals No. Specification
    (T2-3) - VC (E2-23) Continuity
    (T2-4) - VTA2 (E2-24) Continuity
    (T2-5) - VTA (E2-25) Continuity
    (T2-6) - ETA (E2-22) Continuity
    (T2-3) Or VC (E2-23) - E1 (E3-7) No Continuity
    (T2-4) Or VTA2 (E2-24) - E1 (E3-7) No Continuity
    (T2-5) Or VTA (E2-25) - E1 (E3-7) No Continuity
    (T2-6) Or ETA (E2-22) - E1 (E3-7) No Continuity
  8. Disconnect the accelerator pedal position sensor connector. Measure the resistance between the terminals of the accelerator pedal position sensor. See Fig 7. See ACCELERATOR PEDAL POSITION SENSOR RESISTANCE  table. If resistance is to specification, go to next step. If resistance is not to specification, replace accelerator pedal rod assembly.
    Fig 7: Checking Accelerator Pedal Position Sensor Resistance
    G00241637Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    ACCELERATOR PEDAL POSITION SENSOR RESISTANCE

    Terminals No. Specification
    EP1 (1) - VCP1 (4) 1.5-60 Ohms At 68°F (20°C)
    EP2 (3) - VCP2 (5) 1.5-60 Ohms At 68°F (20°C)
  9. Disconnect A14 6-pin accelerator pedal position sensor connector. See Fig 8. Disconnect ECM E5 connector. See Fig 9. Check continuity between the wire harness side connectors. See ACCELERATOR PEDAL POSITION SENSOR/ECM CONTINUITY CHECK  table. If continuity is to specification, check and replace ECM. If continuity is not to specification, repair or replace harness and connector.
    Fig 8: Identifying Accelerator Pedal Position Sensor Connector Terminals
    G00241638Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 9: Identifying ECM E5 Connector Terminals
    G00241639Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    ACCELERATOR PEDAL POSITION SENSOR/ECM CONTINUITY CHECK

    Terminals No. Specification
    EP1 (A14-1) - EPA(E5-34) Continuity
    VCP1 (A14-4) - VCPA (E5-35) Continuity
    VPA1 (A14-5) - VPA (E5-33) Continuity
    EP2 (A14-3) - EPTK (E5-26) Continuity
    VCP2 (A14-6) - VPTK (E5-27) Continuity
    VPA2 (A14-2) - VPTA (E5-32) Continuity
    EP1 (A14-1) Or EPA (E5-34) - E1 (E3-7) No Continuity
    VCP1 (A14-4) Or VCPA (E5-35) - E1 (E3-7) No Continuity
    VPA 1 (A14-5) Or VPA (E5-33) - E1 (E3-7) No Continuity
    EP2 (A14-3) Or EPTK (E5-26) - E1 (E3-7) No Continuity
    VCP2 (A14-6) Or VPTK (E5-27) - E1 (E3-7) No Continuity
    VPA2 (A14-2) Or VPTA (E5-32) - E1 (E3-7) No Continuity
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