Sinmo Posted March 30, 2021 Share Posted March 30, 2021 My 2015 Sienna LE has only 65K miles, and has had no problem since Day 1. Stock Battery was going dead (Due to extended TELEWORK from home), so I replaced it recently. Also, installed Front/Rear Dash Camera last SAT, and tested it while running 30 minutes. Then, I shut off motor. Two hours later, I tried to start to go somewhere. It cranks strongly, but won't start. Got above DTC via OBD II Reader. P0351~P0356 refer to Ignition Coil Primary/Secondary Unit, while P1604 is Startability Mul-function. Tested all fuses & relays, and all OK. Did spark test at coil connection for 2, 4, 6 cylinders on the front, but found no spark while cranking. Tested EFI connection with NOID light, no light comes on while cranking. Fuel pump makes humming noise, so I think it's OK. I can't understand all 6 coils going bad at once without any warning. Do it be that one Coil going bad gives you entire 6 cylinder coil fault code? I hate the idea of taking entire Manifold & Throttle Control Unit just to get to 1, 3, 5 coils/plugs in the back (4~5 hour DIY job) Think it's more electrical/wiring/ECM issue? Does anyone has any idea/suggestion on this issue before I embark on 6 Coils & Spark Plug change?? Thanks in advance. Quote Link to comment Share on other sites More sharing options...
Toyota Owners Club Posted April 7, 2021 Share Posted April 7, 2021 If i were you I would remove the dash cam and see if you disturbed any connections (e.g. in the fuse board) Sometimes good to go back over anything you added/removed and take it back to standard and once sorted then reinstall Quote Link to comment Share on other sites More sharing options...
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