LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 99 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0031, DTC P0032, DTC P0037, DTC P0038, DTC P0051, DTC P0052, DTC P0057 Or DTC P0058 >> Diagnosis & Repair

Diagnosis & Repair

WARNING: This page is about a different car, the 2003 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check resistance of heated oxygen sensor heater. See HEATED OXYGEN SENSOR in SYSTEM & COMPONENT TESTING - LX470 article. Replace as necessary. If okay, go to next step.
  2. Remove the glove compartment door. Turn the ignition switch ON. Measure the voltage between terminals HT1A, HT2A, HT1B and HT2B of the ECM connectors and body ground. See Fig 1. Connect terminal HT1A to bank 1 sensor 1. Connect terminal HT2A to bank 2 sensor 1. Connect terminal HT1B to bank 1 sensor 2. Connect terminal HT2B to bank 2 sensor 2. If voltage is 9-14 volts, check and replace ECM. If voltage is 9-14 volts, check and repair harness or connector between EFI main relay and heated oxygen sensor, and heated oxygen sensor and ECM.
    Fig 1: Identifying ECM Terminals HT1A, HT2A, HT1B & HT2B
    G00232365Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
scientia non olet · About LEMON Manuals