lawsoncl
NAXJA Forum User
- Location
- North Idaho
I'm pretty sure I know the answer to this, but I want to confirm. The patient is an 89 MJ 4.0l that cranks but doesn't start.
100% sure its not the CPS. It measures good at 197 ohms, and I'm getting about 0.5 volts a/c cranking. I have voltage pulses at the injectors (also confirms good cps).
I have a tach signal showing up at pin D1 on the small diag connector when cranking. On a dc voltmeter, its bouncing around mostly 10 volts. This pin comes from the ign module, so the ignition module it getting signals from the ECU. Cap and rotor are 5-months old ans still look good. Still no spark
Sound like a bad ign module to you? I can't tell, but can you replace just the coil, or do you replace the whole thing?
100% sure its not the CPS. It measures good at 197 ohms, and I'm getting about 0.5 volts a/c cranking. I have voltage pulses at the injectors (also confirms good cps).
I have a tach signal showing up at pin D1 on the small diag connector when cranking. On a dc voltmeter, its bouncing around mostly 10 volts. This pin comes from the ign module, so the ignition module it getting signals from the ECU. Cap and rotor are 5-months old ans still look good. Still no spark
Sound like a bad ign module to you? I can't tell, but can you replace just the coil, or do you replace the whole thing?