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These codes are indicating a starting problem and rough idling. Code p1604 is a very vague code and diagnosing it without having a symptom is very complicated. And code p1605 is rough idling which means that the computer have noticed a rough idle situation usually this code is accompanied by other codes or if it's alone then I would suspect a fuel pressure issue. These two codes involve diagnosis and we'll need to dig into this problem deeper to find out what's causing them, Unless you are an experienced technician who need assistance then I will suggest that you take your vehicle to your local toyota dealership and they should be able to find the problem.
p1603 should help by reading this below
http://corolla-club.ru/doc1/c61151d7ba7b9bee3c247e42b685b253.html
code p1604 refers to starting system --malfunction===causes--wiring---connections--vacuum leaks--MAF sensor--ignition system--engine coolant temperature sensor--fuel supply system--throttle body--variable valve timing system---A/C system--- power steering control control--- ECM
Try to think back to the symptoms before the engine failed to start
were you in snow, did it get hot, was it lagging in high rpms,
did it just stop or was it misfiring
each symptom will point to an item in the list of causes.
if you look that up on a normal OBD code its listed as P1604 Code Word Unregestered However for a volvo thats a code for Control Module Self Test, Speed Monitoring which would indicate the ECM or a wiring problem ( usually just a loose connection,, so check the connections on the ECM, which you can have scanned by the dealer, Volvo codes vary from the normal coding on most cars, so be careful when getting codes and their meanings
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