Check TPS
Key "OFF". (Don’t disconnect sensors.)
Select "vehicle scopemeter" in the menu, and connect channel A of scantool with terminal 1 of TPS harness connector.
Connect channel B of scantool with terminal 1 of MAPS harness connector.
Engine start. And check the signal waveforms with stepping on accelerator pedal.
Is the signal waveform within specifications?
YES
Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage. So, check poor connections and the related circuit between ECM and component thoroughly. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO
Substitute the sensor which outputs abnormal waveform with a known-good sensor and check for proper operation. If the problem is corrected, replace the sensor and then go to "Verification of Vehicle Repair" procedure.
