Well apparently it will be cheaper for me to buy a scanner or another used ECM to rule it out as my starting problem than getting someone to figure it out. $85/hr with no time or resolution guarantees doesn't work for me on my budget.
Is there an easier/cheaper way to test voltage on a certain pin/pins on a 93 ODB1 ECM to know if it's fried?
Also, I was considering an Actron scanner, but was told I was better off trying to find a used snapon with the appropriate diagnostics loaded up instead. They still seem very costly on fleabay, any recommendation as to which scanner to get to help me out?
check fuses Then Do a diagnostic.
short out pins A&B on the aldl. turn the key to on but don't try to start the car. the fan will run.
the check engine light will flash once pause, then twice. repeat.
Then count the flashes. they will be in 2 digit segments. like two flashes, then 4 flashes. then a pause, then more flashes. for instance, 24 or 32 etc.
use a pad and pen to mark them down so that when they repeat, you can verify.
If it goes into diagnostic, it is probably ok.
Then use an analog meter, pin onto the injector connector, black is ground, pink and black or green and purple are the pulse wires.
The meter needle will go upscale every pulse. use 24 volt scale first, then click down one notch until you are comfy with needle deflection.
check one injector on left side, one on the right. since they are ganged together.
If the volts are ok, then take the distributor module to auto zone or checker, and have them check it.
If no ignition pulses, it's the module.
Last edited by coupeguy2001; 02-05-2010 at 12:41 AM.
Corvette Store
Is there an easy wasy to test if an ECM is fried?
