Diagnosis & Repair (Using Hand-Held Tester)
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.
- Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. Read the voltage for the accelerator pedal position sensor data. With accelerator pedal released, VPA voltage should be 0.5-1.1 volts and VPA2 voltage should be 1.2-2.0 volts. With pedal depressed, VPA voltage should be 2.6-4.5 volts and VPA2 voltage should be 3.4-5.3 volts. If okay, go to step 5. If not okay, go to next step.
- 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. If okay, go to next step. If not okay, repair harness as necessary.
- 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 Fig 1. If voltage is 4.5-5.5 volts, go to next step. If voltage is not 4.5-5.5 volts, replace ECM.
- Replace accelerator pedal assembly. Go to next step.
- 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 the engine and run at idle for 15 seconds or more. Read DTC output. if no DTC is output, system is okay. If a DTC is output, check and replace ECM.