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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 P1135 Or DTC P1155: Air/Fuel Sensor Heater Circuit >> 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. Access ECM behind glove box. See Figure. Turn ignition on. Using DVOM, backprobe at ECM harness connector E8 and measure voltage between ground and terminals No. 4 (Black/Red wire) and No. 5 (Black wire). See Figure. If either voltage is not 9-14 volts, go to next step. If both voltages are 9-14 volts, replace ECM.
  2. 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.
  3. Check A/F heater relay. A/F heater relay may also be referred to as A/F sensor relay or A/F relay. See A/F HEATER RELAY under MODULES, MOTORS, RELAYS & SOLENOIDS in SYSTEM & COMPONENT TESTING - V6 & V8 article. If A/F heater relay is defective, replace A/F heater relay. If A/F heater relay is okay, repair open or short in wiring between A/F heater relay and A/F sensor, and/or between A/F sensor and ECM. See WIRING DIAGRAMS article.
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