I have a 2003 Gen 1 Prius Mileage: ~161,000 Battery: New From Toyota (3/2019) Spark plugs: replace 3/2019 Coils: Old but seem fine MAF Sensor: New 12/2019, but determined that was not the issue for swapped for Original toyota MAF sensor Throttle body: cleaned 3/2019 Fuses: Checked 3/2019, all good Relays: Haven't tested Disconnected and cleaned all the HV ECU (under passenger side carpet) terminals and the ECM (behind glove box) terminals with electrical cleaner OBDII Codes: P1636, P3002 Repair: Toyota diagnostic testing and fuel line test. No issues ID'd and they could not get the codes to come on while they had it. Suggested new battery Issue: The car was having an intermittent starting problem. It would not go into ready ~20% of the time. Now it never starts unless I first clear the codes. HOWEVER, I realized today that IF codes are present and I turn the OBDII scanner "on" and then try to start (without clearing the codes) the car goes into ready. If the scanner is off it won't start. The car start if no codes are present (after clearing). Any ideas on what is causing my starting issues?
DTC Detecting Condition The battery ECU receives information of the AC ECU, system main relay connection signals, etc. the HV ECU, and stores DTC when an error is detected in the receives information. HINT: Check DTC of other ECUs and see whether any communication error of the HV ECU is stored or not. If HV communication errors are stored in then one ECU, replace the HV ECU. Wiring Diagram Steps 1 - 2 INSPECTION PROCEDURE
