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Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. If other DTCs are displayed, diagnose and repair those DTCs first and retest system. If only DTC P1133 and/or P1153 is displayed, go to next step.
  2. Connect scan tool to Data Link Connector (DLC) No. 3. See Figure. Start engine and increase engine speed to 2500 RPM for approximately 90 seconds. Using scan tool, monitor each A/F sensor output voltage. See AIR/FUEL SENSOR OUTPUT VOLTAGE SPECIFICATIONS  table. If voltage is as specified, go to next step. If voltage is not as specified, go to step  8.
    AIR/FUEL SENSOR OUTPUT VOLTAGE SPECIFICATIONS

    Application & Operating Condition Specification
    Using OBD-II Scan Tool
    Engine Idling, Engine Racing & Driving Vehicle (1) (2)
    Using Toyota Hand-Held Tester
    Engine Idling, Engine Racing & Driving Vehicle (1) (3)
    (1) Drive vehicle at 25 MPH or more with engine speed of 1500 RPM or more while opening and closing the throttle.
    (2) Voltage should not remain at .56 volt or less, .66 volt, or .76 volt or more.
    (3) Voltage should not remain at 2.80 volts or less, 3.30 volts, or 3.80 volts or more.
  3. Check for open or short in wiring between ECM and suspect A/F sensor. See WIRING DIAGRAMS article. If problem exists, repair wiring as necessary. If problem does not exist, go to next step.
  4. Disconnect suspect A/F sensor harness connector. Measure resistance between terminal No. 2 (Black wire on bank No. 1; Black/White wire on bank No. 2) and terminal No. 1 (Black/White wire on bank No. 1; Black/Red wire on bank No. 2) at A/F sensor connector (component side). See Figure. Resistance should be 1.8-3.4 ohms at 68°F (20°C) and 5.0-7.5 ohms at 932°F (500°C). If resistances are not as specified, replace appropriate A/F sensor. If resistances are as specified, go to next step.
  5. 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.
  6. Check fuel pressure. See FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article. Fuel pressure should be 44-50 psi (3.1-3.5 kg/cm2 ) at idle, and should be 21 psi (1.5 kg/cm2 ) or more for 5 minutes after engine has stopped. If fuel pressure is not as specified, repair as necessary. If fuel pressure is as specified, go to next step.
  7. Check fuel injectors. See FUEL SYSTEM in SYSTEM & COMPONENT TESTING - ES300 & RX300 article. Fuel injector volume should be 3.7-4.5 Cu. In. (60-73 cc) every 15 seconds and difference in volume between each injector should be less than .8 Cu. In. (13 cc). Injectors should not leak more than one drop every 12 minutes. If problem exists, repair as necessary. If problem does not exist, replace defective A/F sensor.
  8. Clear DTCs. Perform test drive confirmation, then go to next step. See TEST DRIVE CONFIRMATION .
  9. Recheck for DTCs. If DTC P1133 and/or DTC P1153 is displayed again, replace ECM. If neither DTC P1133 nor P1153 are displayed again, go to next step.
  10. Vehicle either ran out of fuel or problem is intermittent. Check component and ECM connections.
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