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Home >> Toyota >> 2004 >> Matrix Base, FWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 110 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P2120, DTC P2122, DTC P2123, DTC P2125, DTC P2127, DTC P2128 Or DTC P2138 >> 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 LX 470. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check for open and short in harness and connector in VCPA, VCP2, VPA, VPA2, EPA and EPA2 circuit between ECM and accelerator pedal position sensor. Repair as necessary. If okay, go to next step.
  2. Remove the glove compartment door. Turn the ignition switch ON. Disconnect the accelerator pedal position sensor connector. Measure the voltage between terminals VCPA and EPA, and terminals VCP2 and EPA2 of the ECM connector. See Figure. If voltage is 4.5-5.5 volts, go to next step. If voltage is not 4.5-5.5 volts, check and replace ECM.
  3. Replace accelerator pedal assembly. Go to next step.
  4. Connect the hand-held tester to the DLC3. Disconnect the battery terminals or remove the EFI or ECD No.1 fuse and ETCS fuse to clear DTCs. Start and run engine at idle for 15 seconds or more. Read DTC output. If no DTCs are output, system is okay. If DTCs are output, check and replace ECM.
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