Well, 3 PCM and all are bad is hard to believe though it is possible.
When all things fails, the best way to go about it is to start from basics. Here are alist of possible causes and you should go through all of them to ensure that they are all working correctly. The onyly way to confirm if the PCM is bad is to plug it into a running vehicle and test if it starts.
DIFFICULT TO START/NO START (CRANKS OKAY)
" Check idle air control (DC) motor (if applicable).
" Check idle air control (stepper) motor (if applicable).
" Check ignition switch.
" Check camshaft position sensor.
" Check crankshaft position sensor.
" Check park/neutral position switch (A/T).
" Check volume airflow sensor.
" Check engine coolant temperature sensor.
" Check power supply to PCM.
" Check fuel pressure.
" Check ignition timing.
" Check for disconnected or damaged vacuum hoses.
" Check for control relay malfunction.
" Check for SFI system malfunction.
" Check for fuel pump drive control system malfunction.
" Check for ignition coil malfunction.
" Check for power transistor malfunction (if applicable).
" Check for fuel injector malfunction.
" Check for PCM malfunction.
" Ensure electrical harness, connectors and wires are not broken, bent or loose.
During the jumpstatring, was any error made while connecting the jumper cables?
Is the vehicle security system working correctly?
Thursday, February 18th, 2010 AT 6:42 AM