I've got a 1990 D15B2.Recently,when the car is run cold for like 5 min.,she has trouble starting.The computer is throwing a "Code 16", indicating a bad resistor or faulty wiring. I have checked the resitors,both of which are fine, and I need to know what else I can check and diagnose in this circuit?I'm hoping the starting issue has to do with this as well.Thanx for the help.

 

I think the main relay is part of the fuel injector circuit. If your having problems starting the car when it's hot, then your relay could be the culprit. If the fuel injectors are the actual culprit, then you could have problems like power, sputtering, the like.

 

i had the same problem but the cause of it was my o2 sensor