My water pump was recently replaced & I just installed a new radiator.
The mechanic who did the work may have gotten coolant on the drive belts or not sufficiently adjusted the belt tension . I'd replace the belt especially if the sides of the belt are shiny.
SOURCE: self diagnostic test codes
anytime you do the self-diagnostic you will almost always get those 2 codes.
12 - direct power input to the PCM has been disconnected within the last 50 key-on cycles
55 - End of error messages
SOURCE: Losing power to the fuel pump
well that sounds like a relay. if your car is an automatic, double check than you replaced the ASD and fuel pump relays and not the trans control relay.
if its not the relay, its probably the ECU(PCM). 
SOURCE: crankshaft position sensor location
Hello. One way to check if it is working is when you try to start the car does the needle move on you tac? If not then your crank sensor is more then likely the problem. It is located on the backside of the engine under the intake manifold. If is in about the center of the block. There will be a 10mm bolt holding the sensor in. If you decide to change it yourself (not to terrible of a job) unplug the sensor, remove the bolt and spin it back and forth slightly while pulling it out. It may be stoburn and you might have to work at it for a little bit (not a done of room) but it will come. When it's out the sensor will be shaped kind of like an L. I have changed a few of these over time and they can be a little stoburn. To install just reverse the process.
SOURCE: I need to know how tight to tighten the head bolts
do u feel comfortable doin this-u need a repair manual and a torque rench-u must be able to read ft lbs on the tool and follow the book or else u can warp the head-let me know
SOURCE: how do i replace the radiator in a 1998 mitsubishi
Hi,
Drain engine coolant
Disconnect radiator upper and lower hoses from radiator
Disconnect transmission cooler hoses (if automatic)
Remove overflow hose from radiator neck
Set coolant jug and bracket aside
Remove two 12mm bolts holding upper insulators on
Unplug electrical connectors for cooling fans
Lift radiator up out of vehicle.
Alternately, you can unbolt the two cooling fans from the radiator and leave them in. They are held on with four 10mm bolts. It is easier to leave the fans installed for a first timer though
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