HELP PLZ

Tiny
DRIFTKILLER101
  • MEMBER
  • 1995 MITSUBISHI ECLIPSE
Everything in my car is getting power except my coil pack why could that be my mechanic is guessing its the ecu/ecm what do yall think
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Thursday, March 22nd, 2012 AT 11:00 PM

5 Replies

Tiny
CARADIODOC
  • EXPERT
Are you measuring that while cranking the engine?
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Thursday, March 22nd, 2012 AT 11:19 PM
Tiny
DRIFTKILLER101
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Yes
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Thursday, March 22nd, 2012 AT 11:57 PM
Tiny
CARADIODOC
  • EXPERT
The Engine Computer is by far the least likely suspect but that's what a lot of mechanics jump on first because they're used to seeing an extremely high failure rate on GM vehicles. If you measure that voltage at the injectors, I'll bet you find it missing there too.

The most common failure item is the camshaft position sensor. Next would be the crankshaft position sensor. Both of them have to supply signals to the Engine Computer. When they do, the computer turns on the relay to send voltage to the coil pack, injectors, oxygen sensor heater, and fuel pump or pump relay.

If you measure the voltage feeding the coil pack with a test light, you should see it light up for one second after turning on the ignition switch. That proves the relay and wiring are okay and the computer has control of it. If that voltage doesn't come back during cranking, suspect one of those sensors. A scanner will display a diagnostic fault code telling which signal is missing. If there's no code, one of them is shorted and killing the power supply for both of them. That will result in no signal from either sensor and the computer won't even know it should be expecting the signals.

You might get away with using a digital voltmeter to measure that voltage but many of them don't respond fast enough to show that one-second pulse of voltage.
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Friday, March 23rd, 2012 AT 2:44 AM
Tiny
DRIFTKILLER101
  • MEMBER
Itll turn over just not fire n he was also saying that it could possibly be the crank sensor
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Friday, March 23rd, 2012 AT 3:01 AM
Tiny
CARADIODOC
  • EXPERT
Did you verify the voltage is also missing at the injectors? Did you check for voltage to the coil pack for that first one second? That's critical information. Don't get stuck on the ignition coil. There are likely other dead circuits.
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Friday, March 23rd, 2012 AT 3:34 AM

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