dash showed NO BUS and had spark well solved that problem now the NO BUS is off now im not gettin power to the coil ,,,all fuses r good relays r good dont understand NEED HELP PLEASE

 

Are there any codes now? What has been changed?
The coil gets 12 volts from the ASD relay. So do the injectors.
The relay is controlled by the PCM.
If the PCM sees the inputs it needs to start, it turns the ASD and Fuel Pump relays on when the key is turned on.
You should see 12 volts on the coil primary and the injectors now.
If the PCM doesn't see what it needs, these relays are shut down after 3 seconds.
Try just swapping the relays with others to see if it'll start.
You should also hear the fuel pump running when you turn the key on.

 

I received your pm.
Are you still not getting spark?
Can you hear the fuel pump run when you turn the key on?
Do you have fuel pressure?

 

yes fuel pump works bought new 2 yrs a go yes has pressure,,,, still no spark can i rewire the coil to a fuse some where and make it work

 

what is a asd relay i sent u a privet message last night did u get as far as code i dont know i dont have a code reader

 

You only get power for about 3 seconds when you first turn the ignition on at the coil. Same for the injectors. If the PCM doesn't see the engine turning, it will trip the ASD relay. (which is what provides the power.)

Have a friend cycle the key, while you test for power. See what ya get.

 

No, just connecting power to the coil primary will not cause it to create a spark by itself, because the coil requires the 12 volt power AND a trigger signal from the PCM (computer) in order to create the spark.


The PCM (computer) is designed to control both the application of the power and the trigger. Kinda like some people!
It controls the power to the coil and injectors by turning the ASD (Auto Shut Down) Relay on.
It controls the coil and injectors by sending a negative(ground) pulse to them, which creates the spark from the coil, and causes the injectors to pass gas (really).
It won't do any of this if it does not see that the engine is turning over. It monitors the outputs of the crankshaft and camshaft position sensors to determine this.

 

ok ( hey you),,,, said take 3 sec power to coil thats why thought had no power had some 1 keep turnin key on off ,,,,got power and after 3 xs i realized the dash puts out codes it put out 0320 which is crank shaft sensor/ distribotor i replaced the crank sensor so im assummein its the cam sensor now my ASD relay is good so i guess i need to get the cam shaft sensor which only comes as a package part distrub,cap, roter,cam sensor so ill let u all know what happens i ty again for all ur help 1 MORE question my tranny wont come out of 3rd gear now it has a 98 tranny in it and the speed senson is on the over drive shaft on my truck its in the rear end could this b the problem has new filter fluid and both sensors in side the tranny pan

 

What year is your truck? If you are 2000, or, 01, then you need to change the electronics in the trans for it to play nice.

 

Whoa, big fella!!! You do NOT need to buy a distributor, cap, or rotor. The camshaft position sensor (CMP), now called ignition pickup is sold separately.


If you only have p0320, without p0340 or p1391, your CMP is probably ok.


If possible, check the wiring to the crankshaft position sensor.