LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2002 >> IS 300 Base, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 40 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P2102: Throttle Actuator Control Motor Circuit Low Or DTC P2103: Throttle Actuator Control Motor Circuit High >> Diagnosis & Repair (Using OBD-II Scan Tool)
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnosis & Repair (Using OBD-II Scan Tool)

WARNING: This page is about a different car, the 2003 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect the oscilloscope between terminals M+ or M- of the ECM E2 connector and E1 of the ECM E3 connector. Start engine. During cranking or idling, check waveform between terminal M+ of ECM E2 connector and terminal E1 of ECM E3 connector, and between terminal M- of ECM E2 connector and terminal E1 of ECM E3 connector. See Fig 1. If waveforms are okay, go to next step. If waveforms are not okay, replace ECM.
    Fig 1: Checking Waveform Between Terminals Of ECM E2 & E3 Connectors
    G00241651Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Disconnect the throttle control motor connector. Measure the resistance between the terminals of throttle control motor terminals No. 1 and 2. See Figure. Resistance should be .3-100 ohms at 68°F (20°C). If resistance is to specification, go to next step. If resistance is not to specification, replace throttle body assembly.
  3. Disconnect the T2 throttle control motor 2-pin connector. See Figure. Disconnect the ECM E2 connector. Check the continuity between the wire harness side connectors. See Figure. See THROTTLE CONTROL MOTOR/ECM CONTINUITY CHECK table. If continuity is to specification, replace ECM. If continuity is not to specification, repair or replace harness and connector as necessary.
scientia non olet · About LEMON Manuals