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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 98 (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 LS 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the air fuel ratio sensor connector. Measure resistance between the terminals HT and +B of the air fuel ratio sensor. See Fig 1. Resistance should be 11-16 ohms at 68°F (20°C). If okay, go to next step. If not okay, replace heated oxygen sensor.
    Fig 1: Identifying Air/Fuel Ratio Sensor Connector Terminals
    G00165101Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Remove the EFI MAIN relay from the engine room junction block. See Fig 2. See EFI RELAY CHECK  table. Check relay and replace as necessary. If okay, go to next step.
    EFI RELAY CHECK

    Terminal No. Condition Result
    1-2 Constant Continuity
    3-5 Usually No Continuity
    3-5 Voltage Applied Between Terminals No. 1 & 2 Continuity
    Fig 2: Identifying EFI Main Relay Terminals
    G00165102Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Remove the engine room ECU cover. Turn the ignition switch on. Measure the voltage between terminals HTR, HTR2, HTL, HTL2 of the ECM connectors and body ground. See Fig 3. If voltage is 9-14 volts, replace ECM. If voltage is not 9-14 volts, check and repair harness or connector between EFI main relay and heated oxygen sensor, and heated oxygen sensor and ECM.
    Fig 3: Checking Voltage At HTR & HTL Terminals Of ECM
    G00165103Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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