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Home >> Toyota >> 2004 >> Matrix Base, FWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 106 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0120, DTC P0122, DTC P0123, DTC P0220, DTC P0222, DTC P0223 Or DTC P2135 >> Diagnosis & Repair (Using OBD-II Scan Tool)
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Diagnosis & Repair (Using OBD-II Scan Tool)

WARNING: This page is about a different car, the 2003 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Access ECM at left front of engine compartment. Turn ignition on. Backprobing, measure voltage between terminals VC and E2 at ECM E5 connector. See Figure and Figure . If voltage is 4.5-5.5 volts, go to next step. If voltage is not 4.5-5.5 volts, replace ECM and retest.
  2. Turn ignition on. Backprobing, measure voltage between terminals VTA and E2 at ECM E2 and E5 connectors. See Figure. Voltage should be .4-1.0 volt with throttle fully closed, and 3.2-4.8 volts with throttle fully open. Backprobing, measure voltage between terminals VTA2 and E2 at ECM E2 and E5 connectors. Voltage should be 2.0-2.9 volts with throttle fully closed, and 4.6-5.1 volts with throttle fully open. If voltage is not as specified, go to next step. If voltage is as specified, replace ECM and retest.
  3. Check TP sensor operation. See Figure. See SYSTEM & COMPONENT TESTING - GS300, GS430, IS300 & LS430 article. See THROTTLE POSITION SENSOR RESISTANCE  table. Replace TP sensor as necessary. If TP sensor is okay, check for short or open circuit in wiring harness between ECM E2 and E5 connector and TP sensor. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. Repair wiring as necessary.
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