Dear friend
When you diagnosis the vehicle and get three codes p1603, p1604 and p1605 and there are no other codes regarding engine, then you need to follow this video, this video will help you, first time when the vehicle arrive with this situation on my shop i diagnosed the vehicle and put out the result there is may be fault in engine valve, i putted out the result because customer was in hurry and few days ago a carolla 2013 model arrived on my shop, that vehicle had this problem engine in idle position was rough and was shaking, I diagnosed the vehicle with my VDM and there was three codes p1604, p1604 and p1605, the vehicle was not able to drive, the gas pedal was not working, when i pressed the full pedal it take about 15 second to take RPM to 4 and vehicle engine power was too low, then i was thinking what i need to do, so I stopped the engine and check the spark in all the coils, I had checked the all coil one by one, then there is one question had created in my mind if there us coil problem Diagnostic computer must give me code regarding coils, then i tried to test the pulses in the coil connectors there was two coil connectors had no pulses then quickly i putted out the result there is ECU problem.
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