I'm looking for a (free) PDF copy of Technical Service Bulletin T-SB-0180-09 [June 17, 2009], which supercedes TSB EG011-03 [June 12, 2003]. Situation as follows: 2003 Prius Malfunction Indicator Lamp lit on start-up during sub-freezing weather for failure to start (P3191 and P3101 codes loaded). Occurred twice (so far). Dealer diagnosed as possible fuel pump problem, though fuel pressure nominal and held pressure after engine shut-off. Independent mechanic (using EG011-03) diagnosed following: Diagnosis codes: P3191 (engine does not start) and P3101 with information code 205. Circuit opening relay was fine. Fuel Pressure was normal (~45 psig) and held after engine shut off. Coolant temperature - 9 deg C Engine RPM - 1200 MG1 Torque value - 0 Installed ECU Part Number - 89661-47053, calibration # 14705301, 14705302 EG011-03 decision tree leads to replace Engine Control Module with newer part number. Took back to dealer, who indicated still possible fuel pump problem (and reluctant to replace ECM). Told to go research further before returning.
Here you go.... These are both very general error codes and have multiple potential causes. Fuel contamination is emphasized in the TSB. Almost anything that can make a gasoline engine hard to start can trigger 3191. Ignition, fuel delivery, mixture, oil level, air filter etc. These cars don't have the ability to crank the starter until it fires, so it sets the DTC. I understand the replacement ecu simply allows more time for the engine to fire before setting the DTC, but I don't know this for sure. Good luck. If you decide you need an ECU, let me know I have them in stock. Eric Adopt A Part 1-800-508-2211
Thanks, Eric, for the TSB. If it becomes chronic after the ECM goes out of warranty, I'll give you a shout offline. Ted
It's very interesting to see that the new TSB focuses on throttle body cleaning (which had been ignored by TSB EG011-03 although the long-time denizens of this group have advocated that procedure over the last few years) and no longer recommends replacing a downlevel engine ECU.
As far as cleaning the TB with my FJ it's very easy to remove the TB and there is enough slack in the TB coolant hoses to keep the TB 2 inches off the intake That keeps the cleaner out of the intake and allows you to clean the backside of the blade. I have to do this procedure twice a year
