420A 2gNT No spark. No start. HELP!

[zephyr2oo5]

Yes I have spark, fuel, and injector pulse until I start cranking. Then it all stops, and I have nothing. Where is the power transistor unit

 

[VelocitàPaola]

There is no power transistor unit in a 420A. Remember where you're posting guys...

 

[dr1665]

Yes I have spark, fuel, and injector pulse until I start cranking. Then it all stops, and I have nothing. Where is the power transistor unit

Disconnect the fuel pump relay and backprobe both the CPS and CMP at the ECU connectors. If you aren't getting alternating 5VDC while cranking, then the ECU will trip the ASD, rendering the car DOA. Savvy?

 

[zephyr2oo5]

so if they're not alternating then I know that they are not. What can I do to fix it?

 

[robleen69]

i have the same prob on my 98 eclipse GS ... it cranks but will not start no spark i have new Cam sensor and crankshaft position sensor i cant tell if it is the transisters how do i check them.. please pm me with any help thanx

 

[jvtalon]

yea ive been having the same problem. i replaced all the crank senors and even got a new ecm but still no fire. i need to know what the colors mean on the wires going to the crank and cam sensor, like which one is the ground, power and signal output.

 

[Jordan1083]

ok i have a 95 gs with turbo and msd ignition due to another problem i replaced both the crank and cam sensors the car ran for close to 200 miles the next day no spark what so ever. ive rechecked the wiring of the cam shaft sensor and crank sensor and replaced the coil. i bypassed the msd still no spark(MSD ingnition box showed a trouble code of faulty trigger wire signal. i have power to the coil but no signals on the trigger wires (checked by connecting a test light to the power wire and the trigger wire it didnt blink while cranking) i attempted to check the ASD but the hans manual shows three relays where i only have two so i checked them both and got them to function. the fuel pressure has remained constant at my fuel pressor regulator. when i uplug the cam shaft sensor and plug it back in i hear the fuel pump and the relay kick on. also checked continuity of the trigger wires to the ECU and they are good Im completly out of ideas except the ECU itself

 

[Jordan1083]

Disconnect the fuel pump relay and backprobe both the CPS and CMP at the ECU connectors. If you aren't getting alternating 5VDC while cranking, then the ECU will trip the ASD, rendering the car DOA. Savvy?

ok cps= crank position sensor
ECU= engine control unit
ASD= automatic shutdown or something (also called the fuel injection relay right)
but for the life of me i cant figure out what CMP stands for im in the army so i should be good at figuring out abbrevations but this one is kicking my butt little help please

 

[rstare]

ok cps= crank position sensor
ECU= engine control unit
ASD= automatic shutdown or something (also called the fuel injection relay right)
but for the life of me i cant figure out what CMP stands for im in the army so i should be good at figuring out abbrevations but this one is kicking my butt little help please

Typically, when your talking about the 420a, CAS stand for Crank Angle Sensor, and CPS stands for Camshaft Position Sensor... typically.
However, Drigg's used CMP to refer to the Camshaft Position Sensor, and the other ones you are correct on.

 

[LD25Delta9]

I know it's a pretty well dead post but to the OP: Why are you running SAFC anyways? There is a thread on here that explains why they are junk for our car when you run a turbo. As soon as you hit positive pressure on the system, the SAFC is useless. Rip out that junk and triple check your wires like H8RS said.