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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 17 (Engine Control System Self-Diagnostics - 4-Cylinder) >> Diagnostic Tests >> DTC P1133 Or DTC P1153: Air/Fuel Sensor Circuit Response >> Diagnosis & Repair

Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. Using Toyota hand-held tester or scan tool, check for any other DTCs. If only DTC P1133 or DTC P1153 exists, go to next step. If other DTCs exist, diagnose and repair those DTCs first and retest.
  2. With Toyota hand-held tester or scan tool still connected to DLC No. 3, start engine and maintain engine speed at 2500 RPM for about 90 seconds to fully warm the A/F sensor. Allow engine to idle.
    3. NOTE: DTC P1130 is for A/F sensor (bank No. 1 sensor No. 1) which is located on exhaust manifold above catalytic converter for cylinders No. 1 and 4. DTC P1150 is for A/F sensor (bank No. 2 sensor No. 1) which is located on exhaust manifold above catalytic converter for cylinders No. 2 and 3. Ensure test procedure is performed on appropriate A/F sensor.
    NOTE: If A/F sensor output voltage remains 3.30 volts (Toyota hand-held tester) or .66 volt (OBD-II scan tool) during all conditions, A/F sensor circuit may be open. If A/F sensor output voltage remains 3.80 volts or more (Toyota hand-held tester) or .76 volt or more (OBD-II scan tool) during all conditions, A/F sensor circuit may be shorted. If A/F sensor output voltage remains 2.80 volts or less (Toyota hand-held tester) or .56 volt or less (OBD-II scan tool) during all conditions, A/F sensor circuit may be shorted. During fuel enrichment, A/F sensor output voltage may be less than 2.8 volts (Toyota hand-held tester) or .56 volt (OBD-II scan tool) which is normal. During fuel cut, A/F sensor output voltage may be more than 3.8 volts (Toyota hand-held tester) or .76 volt (OBD-II scan tool) which is normal.
  3. Using hand-held tester or scan tool, monitor appropriate A/F sensor output voltage with engine idling, engine racing and while driving vehicle at 25 MPH or more with engine speed of 1500 RPM or more while opening and closing the throttle. Ensure A/F sensor output voltage is as specified. See AIR/FUEL SENSOR OUTPUT VOLTAGE SPECIFICATIONS  table. If A/F sensor output voltage is not as specified, go to next step. If voltage is not as specified, go to step  9.
    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.
  4. Check for open or short in wiring between ECM and suspect A/F sensor. See WIRING DIAGRAMS article. If problem does not exist, go to next step. If problem exists, repair wiring as necessary.
  5. Disconnect suspect A/F sensor harness connector. Measure resistance between terminal B+ (Red/White wire) and HT (Black/Red wire on bank No. 1; Black 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 resistance is as specified, go to next step. If resistance is not as specified, replace appropriate A/F sensor.
  6. Ensure oil dipstick, oil filler cap, PCV system and all other air induction system components are intact and operating properly. If problem does not exist, go to next step. If problem exists, repair as necessary.
  7. Check fuel pressure. See FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 4-CYLINDER 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 as specified, go to next step. If fuel pressure is not as specified, repair as necessary.
  8. Check operation of fuel injectors. See FUEL SYSTEMS in SYSTEM & COMPONENT TESTING - 4-CYLINDER article. Fuel injector volume should be 4.2-5.0 Cu. In. (69-82 cc) every 15 seconds and difference in volume between each fuel injector should be less than .8 Cu. In. (13 cc). Fuel 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.
  9. Using Toyota hand-held tester or scan tool, clear DTCs from ECM. Perform test drive confirmation, then go to next step. See TEST DRIVE CONFIRMATION .
  10. Recheck for DTCs. If neither DTC P1133 or P1153 is displayed again, go to next step. If DTC P1133 and/or P1153 is displayed again, replace ECM.
  11. Vehicle either ran out of fuel or problem is intermittent. Check component and ECM connections.
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