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Home >> Toyota >> 2000 >> 4Runner Base, 4WD >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Control System Self-Diagnostics - 4-Cylinder >> Diagnostic Tests >> DTC P0135: Heated Oxygen Sensor No. 1 Heater Circuit (Except CALIF. Emissions) >> Diagnosis & Repair

Diagnosis & Repair

  1. Access ECM behind glove box. Turn ignition on. Using DVOM, backprobe ECM harness connector and measure voltage between ground and terminal No. 2 (Pink wire) at ECM harness connector E5. See Figure. Voltage should be 9-14 volts. If voltage is as specified, replace ECM. If voltage is not as specified, go to next step.
  2. Disconnect heated oxygen sensor No. 1 harness connector. Measure resistance between terminals B+ (White/Blue wire) and HT (Pink wire) at heated oxygen sensor connector (component side). See Fig 1. Resistance should be 11-16 ohms at 68°F (20°C) and 23-32 ohms at 1472°F (800°C). If resistance is not as specified, replace heated oxygen sensor No. 1. If resistance is as specified, go to next step.
  3. Repair wiring between ECM and heated oxygen sensor No. 1, or between heated oxygen sensor No. 1 and EFI main relay. See WIRING DIAGRAMS article.
Fig 1: Testing Heated Oxygen Sensor No. 1 Heater
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