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Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Toyota Prius. 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 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. Using hand-held tester or scan tool, monitor heated oxygen senor No. 1 output voltage. Heated oxygen senor No. 1 output voltage should alternate repeatedly between less than .42 volt and more than .48 volt. If output voltage is not within specification, go to next step. If output voltage is as within specification, go to step  7.
  3. Check for open and short in wiring harness and electrical connectors between heated oxygen sensor No. 1 and ECM. See WIRING DIAGRAMS article. Heated oxygen sensor No. 1 is located on exhaust pipe in front of catalytic converter. 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 PRIUS under FUEL PRESSURE under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 4-CYLINDER article. Fuel pressure should be 44-50 psi (3.1-3.5 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 - 4-CYLINDER article. Fuel injector volume should be 36-46 cc (2.1-2.8 cu. in.) within 15 seconds and difference in volume between each fuel injector should be less than 10 cc (.61 cu. in.). Fuel injectors should not leak more than one drop every 12 minutes. If fuel injectors are okay, replace heated oxygen sensor No. 1. See HEATED OXYGEN SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL, OVERHAUL & INSTALLATION - 4-CYLINDER 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, then go to next step. See TEST DRIVE CONFIRMATION .
  8. Recheck for DTCs. If DTC P0130 does not exist, replace ECM. ECM is located behind glove box. ECM is located behind glove box. See Figure. If DTC P0130 exists, problem is intermittent. Check for defective connections or intermittent problem in wiring between heated oxygen sensor No. 1 and electrical connectors. ECM is located behind glove box. See Figure.
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