'98 2500, 5.8L gas.
My truck went suddenly from running to cranking without firing.
The ECU isn't sending signals either to activate the fuel pump relay, or activating the spark plugs. The ignition coil and the relay have both tested as good.
From what I've seen, the ECU waits until it gets signals from the crank position sensor and the cam shaft sensor before turning on the fuel pump and the ignition coil. I replaced the crank position sensor since I heard this is a common cause. No improvement.
I think the issue has to be either the ECU or the camshaft sensor, neither seem like high probabilities to me. Am I missing any other likely culprits?
I've got plenty of electrical test equipment, so I can take oscilloscope reading on things if it will help.
How can I confirm the ECU as either good or bad?
If it is the ECU, is it easily replaceable?
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My truck went suddenly from running to cranking without firing.
The ECU isn't sending signals either to activate the fuel pump relay, or activating the spark plugs. The ignition coil and the relay have both tested as good.
From what I've seen, the ECU waits until it gets signals from the crank position sensor and the cam shaft sensor before turning on the fuel pump and the ignition coil. I replaced the crank position sensor since I heard this is a common cause. No improvement.
I think the issue has to be either the ECU or the camshaft sensor, neither seem like high probabilities to me. Am I missing any other likely culprits?
I've got plenty of electrical test equipment, so I can take oscilloscope reading on things if it will help.
How can I confirm the ECU as either good or bad?
If it is the ECU, is it easily replaceable?
Sent from my SM-G950U using Tapatalk