91 tracker wont start

[redtracker2008]

hello i have a 91 tracker that will not start .some on has replaced the ecm with a reman unit.i have a check engine light with the switch in the on position . i have not checked to see is i have spark .does any on e have a quick way to check to see if the ecm has failed again or is there another problem?? thanks for your help

[jtgh]

id bet it didnt.

wont start or wont crank. ?

first off , CEL comes on at key on, "no start" (signally driver that ECU is happy)
then after starting, the lamp must go out, if it dont than is telling you , to pull codes.

Check Engine Lamp stuck ON?



another nice feature of this ECU is that you can inserted the Diagnostic jumper (a paper clip) and crank at the same time.
this evokes the magic , code 41, 42 test.

if you have CAS or ignition failure (primary) then you get codes 41, or 42.

1st test spark (get a tune up too_)

there will never be injection unless there is spark.
after spark is tested.
then check injection with a NOID lamp.

on a 91 , you can SEE injection , by simply looking down the hole.

PS: one nut is hidden under plastic lid of main air pipe , directly above TBoby

check spark.