LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2004 >> Matrix Base, FWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 110 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0120, DTC P0122, DTC P0123, DTC P0220, DTC P0222, DTC P0223 Or DTC P2135 >> Diagnosis & Repair (Using Lexus Scan Tool)
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnosis & Repair (Using Lexus Scan Tool)

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. Connect scan tool to Data Link Connector (DLC) No. 3. See Figure. Turn ignition on. Read voltage for accelerator pedal position sensor data. See Fig 1
    Fig 1: Reading Accelerator Pedal Position Sensor Data
    G00239853Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Check for open and short in harness and connector in VC, VTA1, VTA2 and E2 circuits between ECM and throttle control motor and sensor. See Figure. Repair or replace harness and connector as necessary. If okay, go to next step.
  3. Remove the glove compartment door. Turn the ignition switch ON. Disconnect the throttle control motor and sensor connector. See Fig 2. Measure the voltage between terminals VC and E2 of the ECM connector. If voltage is 4.5-5.5 volts, go to next step. If voltage is not 4.5-5.5 volts, replace ECM.
    Fig 2: Disconnecting Throttle Control Motor & Sensor
    G00239854Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Replace throttle control motor and sensor. See THROTTLE CONTROL MOTOR in REMOVAL & INSTALLATION article. Go to next step.
  5. Connect the hand-held tester to the DLC3. Disconnect the battery terminals or remove the EFI or ECD No.1 fuse to clear DTCs. Start and run engine at idle for 15 seconds or more. Read DTC output. If no DTCs are set, system is okay. If any DTCs are set, check and replace ECM.
scientia non olet · About LEMON Manuals