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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 any other codes are displayed other than DTC P0134 or P0154, diagnose and repair those codes first. If only DTC P0134 or DTC P0154 is displayed, go to next step.
  2. Warm up the engine to the normal operating temperature above 169°F (75°C). Using scan tool, read the voltage output of the heated oxygen sensor when the engine is suddenly raced. Perform a quick racing to 4000 RPM 3 times using the accelerator pedal. If heated oxygen sensor outputs a RICH signal (0.45 volts or more) at least once, go to step  10. If not, go to next step.
  3. Check connection of PCV hose. Repair as necessary. If okay, go to next step.
  4. Disconnect the H9, H10, H15 and H16 heated oxygen sensor connectors. See Fig 1. Disconnect the E3, E4 and E5 ECM connectors. See Fig 2. Check the continuity between wire harness side connectors. See HO2S/ECM CONTINUITY CHECK  table. If okay, go to next step. If not okay, repair or replace harness or connector as necessary.
    Fig 1: Identifying Oxygen Sensor H9, H10, H15 & H16 Connector Terminals
    G00239955Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 2: Identifying ECM E3, E4 & E5 Connector Terminals
    G00239956Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    HO2S/ECM CONTINUITY CHECK

    Terminals No. Specification
    OX (H9-3) - OXL1 (E3-28) Continuity
    HT (H9-1) - HTL (E3-9) Continuity
    OX (H10-3) - OXR1 (E4-28) Continuity
    HT (H10-1) - HTR (E4-30) Continuity
    OX (H15-4) - OXL2 (E5-28) Continuity
    HT (H15-2) - HTL2 (E5-7) Continuity
    OX (H16-4) - OXR2 (E5-17) Continuity
    HT (H16-2) - HTR2 (E5-8) Continuity
    OX (H9-3) Or OXL1 (E3-28) - E1 (E3-7) No Continuity
    HT (H9-1 ) Or HTL (E3-9) - E1 (E3-7) No Continuity
    OX (H10-3) Or OXR1 (E4-28) - E1 (E3-7) No Continuity
    HT (H10-1) Or HTR (E4-30) - E1 (E3-7) No Continuity
    OX (H15-4) Or OXL2 (E5-28) - E1 (E3-7) No Continuity
    HT (H15-2) Or HTL2 (E5-7) - E1 (E3-7) No Continuity
    OX (H16-4) Or OXR2 (E5-17) - E1 (E3-7) No Continuity
    HT (H1-26) Or HTR2 (E5-8) - E1 (E3-7) No Continuity
  5. Check whether misfire has occurred or not by monitoring DTC and data list. Performing troubleshooting for misfire as necessary. If okay, go to next step.
  6. Ensure oil dipstick, oil filler cap, PCV system and all other air induction system components are intact and operating properly. If problem exists, repair as necessary. If problem does not exist, go to next step.
  7. Check fuel pressure. Fuel pressure should be 44-50 psi (3.1-3.5 kg/cm2 ) and remain at 21 psi (1.5 kg/cm2 ) for 5 minutes after engine has stopped. If fuel pressure is not within specification, replace fuel pump. If fuel pressure is within specification, go to next step.
  8. Check fuel injectors. See Figure. Injector volume should be 3.7-4.5 cu. in. (60-73 cm3 ) per 15 seconds. Difference between each injector should be .6 cu. in. (13 cm3 ) or less. If problem exists, repair as necessary. If problem does not exist, replace suspect heated oxygen sensor.
  9. Check for exhaust system leak. Repair as necessary. If okay, replace heated oxygen sensor.
  10. Perform confirmation test drive, then go to next step. See CONFIRMATION DRIVING PATTERN .
  11. Check if DTC P0134 or P0154 are output. If not, go to next step. If yes, check and replace ECM.
  12. Check if vehicle ran out of fuel in the past. If not, problem is intermittent. If yes, DTC is caused by vehicle running out of fuel.
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