22re injectors not firing

[san supra]

a friend has replaced the ecu and resistor but when he checks the injector wires with that node thing none of them get a signal.
what else can he look for? (yes he gets fuel and the cold start does fire)
the motor cranks and everything else on the truck works.

some guy online said he had a bad harness but that seems far fetched for only 4 wires to be effected when his harness is in good shape.

any ideas? i would love to help him.
thanks

 

[toyotanos]

Are you sure that the injectors are getting a good positive voltage supply? If you put a noid light on an injector pigtail it still needs + and - to flash. Make sure the injectors have 12v (may be more like 9volts with the resistor) going to one pin for each injector, and then the ECU grounds the other pin to fire the injector. That's where I would start.

FYI- cold-start injector circuit is separate from the normal injectors. Also- what year truck/celica is this on?

 

[san supra]

86 pickup
i will tell him to check the voltage