Hey guys, got a 1995 NF Fairlane with no spark.
Car cranks fine, have 12v at the coil coming from the ignition when on reds.
The 3 yellow signal wires that come from the ECU all have 12v, but no pulse when cranking, they all stay at 12v.
Injectors are pulsing so no issue with fuel.
Have a new battery connected to it, has a new cam sensor that tests fine at around 1100ohm, crank sensor also tests fine at around 360ohm, tried a new crank sensor to be sure but no difference. Also tried 2 different ECU’s with the exact same code as the original (4DMF), still no difference. Have tried testing for coil pulse as well as cam/crank sensor readings at the ECU and getting the same reading as the engine bay so wiring looks fine. I though it would be an ECU problem not sending a pulse signal to the coil but all 3 ECU’s cant be faulty.
I’ve exhausted every option I can think of. What else could cause no coil pulse? Have I missed something obvious here? I’m at a complete loss here. Any suggestions would be greatly appreciated.
Thanks guys.
Car cranks fine, have 12v at the coil coming from the ignition when on reds.
The 3 yellow signal wires that come from the ECU all have 12v, but no pulse when cranking, they all stay at 12v.
Injectors are pulsing so no issue with fuel.
Have a new battery connected to it, has a new cam sensor that tests fine at around 1100ohm, crank sensor also tests fine at around 360ohm, tried a new crank sensor to be sure but no difference. Also tried 2 different ECU’s with the exact same code as the original (4DMF), still no difference. Have tried testing for coil pulse as well as cam/crank sensor readings at the ECU and getting the same reading as the engine bay so wiring looks fine. I though it would be an ECU problem not sending a pulse signal to the coil but all 3 ECU’s cant be faulty.
I’ve exhausted every option I can think of. What else could cause no coil pulse? Have I missed something obvious here? I’m at a complete loss here. Any suggestions would be greatly appreciated.
Thanks guys.
