Thread: injectors not pulsing!

ok its a '97 Gp 3800 non sc. The issue is there is no pulse or juice to the injectors. I can spray carb clean in the throttle body and it runs great while spraying. I have swapped out crank & cam sensors, icm, pcm, map sensor, throttle and mass air sensors, fuel pump. I have even opened up the whole loom and the wires all look good and i have checked them with an multimeter to see if they r broken. i havent checked fuel pressure but i have tried 3 pumps and they all kick in. Is there something i have missed or is there someone out there who has had a simular issue and found a cure? Just up and quit. shows a code p1200 injector control circuit. Thanks for looking.......

Fuel pump resistor? If you do a search, you may find what your looking for in more detail.

My dads car is doing the same thing... Still haven't got it working yet, if you figure it out please let me know, Ill let you know if I figure anything out

Originally Posted by kfish

how do you know the injectors arent pulsing? have you used noid lights?

This.

I believe the security system will turn off the injectors, as will a bad ICM or crank position sensor. I can't see all of the injector drivers going bad at once, so the PCM wouldn't be my first guess, but it's possible. Any DTCs?

The injectors are powered by one fuse and toggled by grounds to each individually from the pcm.

If your security system is pissed off, you will typically start and run for a few moments on the prime shot that was enabled before the security on the key was checked (many models, unsure about yours)

One other thing to check is the MAF. Unplug it and give her a whirl. The maf can read improperly and cut fuel off.

ive deal with the security issue... it will throw flashing security light and a DTS for security