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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 18 (Engine Control System Self-Diagnostics - V6) >> 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.
    NOTE: DTC P1135 is for heater on A/F sensor (bank No. 1 sensor No. 1) which is located on rear (firewall side) exhaust manifold. DTC P1155 is for heater on A/F sensor (bank No. 2 sensor No. 1) which is located on front (radiator side) exhaust manifold. Ensure test procedure is performed for heater on appropriate A/F sensor.
  1. Access ECM behind glove box. See Figure. Turn ignition on. Using DVOM, backprobe at ECM and measure voltage between ground and terminals No. 3 (Black/Red wire) and No. 4 (Black wire) at ECM harness connector E8. See Figure. If either voltage is not 9-14 volts, go to next step. If both voltages are 9-14 volts, replace ECM.
  2. Turn ignition off. 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 0.8-1.4 ohms at 68°F (20°C) and 1.8-3.2 ohms at 1472°F (800°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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