[89IROC&RS]

i find the code 15 the most telling. if the temp sensor is an open circuit, the fan wont turn on, and the car will overheat.

if youve already replaced the sensor, id say its time to start checking the wiring harness for damage.

also, the TPS can alter your air fuel ratios if its off. by confusing the computer as to how much throttle youre actually giving the engine. if you havent tested or replaced the sensor, that would also be a good cirucit to check for damage.

same for MAP/MAF

with all these sensors saying the same thing, about low voltage or open, it sounds like you have a pinched or damaged harness somewhere. its a painstaking and slow process, and someone will probly need to give you access to the wiring diagrams. wherever those harnesses all converge is probly where some damage is.