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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 P0120, DTC P0122, DTC P0123, DTC P0220, DTC P0222, DTC P0223 Or DTC P2135 >> 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 throttle position sensor connector. Measure the resistance between terminals VC and ETA of the throttle position sensor. Resistance should be 1.2-3.2 ohms at 68°F (20°C). Measure the resistance between terminals VTA and ETA, and between VTA2 and ETA of the throttle position sensor. See Fig 1. Resistance should be 1.8-10.5 ohms at 68°F (20°C). If okay, check and replace ECM. If not okay, go to next step.
    Fig 1: Checking Throttle Position Sensor Resistance
    G00165122Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Remove the engine room ECU cover. Turn the ignition switch ON. Measure the voltage between terminals VC and ETA of ECM connector E5. See Fig 2. If voltage is 4.5-5.5 volts, go to next step. If not, check and replace ECM.
    Fig 2: Checking Voltage Between ECM Terminals ETA & VC
    G00165123Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Check for open and short in harness and connector in VC, VTA, VTA2 and ETA circuits between ECM and throttle position sensor. Repair as necessary. If okay, replace throttle position sensor.
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