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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Engine Control System Self-Diagnostics) >> Diagnostic Tests >> DTC P0130: Heated Oxygen Sensor Circuit (Bank No. 1 Sensor No. 1), Or DTC P0150: Heated Oxygen Sensor Circuit (Bank No. 2 Sensor No. 1) >> Diagnosis & Repair

Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Toyota Land Cruiser. 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 P0130 and/or DTC P0150 exists, go to next step. If other DTCs exist, diagnose and repair those DTCs first and retest.
  2. With hand-held tester or scan tool still connected to DLC No. 3, start engine and increase engine speed to 2500 RPM for approximately 90 seconds and then allow engine to idle. Monitor output voltage for appropriate heated oxygen sensor on exhaust manifold with engine idling. Output voltage should fluctuate from less than .40 volt to more than .55 volt. If output voltage is not within specification, go to next step. If output voltage is within specification, go to step  7.
  3. Check for open and short in wiring harness and electrical connectors between appropriate heated oxygen sensor on exhaust manifold and ECM. See WIRING DIAGRAMS article. Heated oxygen sensor (bank No. 1 sensor No. 1) is located on driver's side exhaust manifold and heated oxygen sensor (bank No. 2 sensor No. 1) is located on passenger's side exhaust manifold. ECM is located behind glove box. See Figure. If wiring harness and electrical connectors are okay, go to next step. If wiring harness or electrical connector is defective, repair as necessary.
  4. Ensure engine oil dipstick, oil filler cap, Positive Crankcase Ventilation (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.
  5. Check fuel pressure. See FUEL PRESSURE under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - V6 & V8 article. Fuel pressure should be 38-44 psi (2.7-3.1 kg/cm2 ) with engine idling and should remain at least 21 psi (1.5 kg/cm2 ) for a minimum of 5 minutes after engine is shut off. If fuel pressure is within specification, go to next step. If fuel pressure is not within specification, repair fuel system as necessary.
  6. Check operation of fuel injectors. See FUEL CONTROL under FUEL SYSTEMS in SYSTEM & COMPONENT TESTING - V6 & V8 article. Fuel injector volume should be 56-69 cc (3.4-4.2 cu. in.) within 15 seconds and difference in volume between each fuel injector should be less than 13 cc (.8 cu. in.). Fuel injectors should not leak more than one drop every 12 minutes. If fuel injectors are okay, replace appropriate heated oxygen sensor located on exhaust manifold. See HEATED OXYGEN SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. If fuel injectors are defective, replace fuel injectors as necessary.
  7. Using Toyota hand-held tester or scan tool, clear DTCs from ECM. Perform test drive confirmation and then go to next step. See TEST DRIVE CONFIRMATION .
  8. Recheck for DTCs. If DTC P0130 and/or DTC P0150 exists, replace ECM. ECM is located behind glove box. See Figure. If DTC P0130 or DTC P0150 does not exist, check for defective connections or intermittent problem in wiring between heated oxygen sensor on exhaust manifold and ECM. ECM is located behind glove box. See Figure.
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