LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P1135 Or P1155: Air/Fuel Sensor Heater Circuit Malfunction >> Diagnosis & Repair

Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Access ECM behind glove box. Turn ignition on. Using DVOM, backprobe at ECM harness connector and measure voltage between ground and terminals No. 3 (Blue wire) and No. 4 (Green wire) at ECM harness connector E8. See Figure. If both voltages are 9-14 volts, replace ECM. If either voltage is not 9-14 volts, go to next step.
  2. Disconnect suspect A/F sensor harness connector. One A/F sensor is located in each exhaust manifold. Measure resistance between terminal B+ (Black/Red wire) and HT (Blue wire on bank No. 1 or Green wire on bank No. 2) at A/F sensor connector (component side). Resistance should be .8-1.4 ohms at 68°F (20°C) or 1.8-3.2 ohms at 1472°F (800°C). If resistance is not as specified, replace appropriate A/F sensor. If resistance is as specified, go to next step.
  3. Check for faulty A/F sensor heater relay located in relay box next to battery. See RELAYS & SOLENOIDS in SYSTEM & COMPONENT TESTING article. If A/F sensor heater relay is defective, replace as necessary and retest system. If A/F sensor heater relay is okay, go to next step.
  4. Check for open or short in wiring between A/F sensor heater relay, A/F sensor and ECM. See WIRING DIAGRAMS article. Repair as necessary.
scientia non olet · About LEMON Manuals