Question about 2002 GMC Yukon XL

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Getting no fuel pressure, jumped relay and pump comes on, also have no spark i replace the crank angle sensor thinking it was that but no luck, do you think the ecm may be the corprate

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You can determine if the ECM is the problem by making sure whether or not the Check engine light comes on momentarily as usual when you insert the key and turn it to the 'run' position. If the CEL comes on momentarily as usual, then the ECM is not the problem.
More likely your problem is the fusible link which supplies power to both the fuel pump as well as the ignition module. This fusible link is located in on the fuse panel.

Posted on Jan 02, 2011


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Posted on Jan 02, 2017


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My car can cranking but wont start,i have been replace fuel pump,spark plugs and crank angle sensor but still same problem.i need help please.Thanks.

Did you check the ignition coil for spark? Also, U might want to try replacing the coil since a weak spark will not jump the gap within the confines of a pressurized cylinder.

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I am wondering if the immobiliser is disengaging?
A friend with a Kia once left his keys on the kitchen microwave with a similar effect. Fortunately the car was almost new and the dealer took pity on him and reprogrammed the system free of charge.

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When you switch the ignition on, you should hear the fuel pump run for a few seconds, then stop. What the system is now waiting for is the crank angle sensor input, to tell it to run the pump again. If you have a crank angle sensor problem (or immobiliser problem) the pump will not switch on again, so no fuel pressure. You need to establish if the pump runs and builds fuel pressure when you crank. Pump runs, but no pressure? No fuel getting into pump, out of fuel, or strainer blocked up, pump unit worn out.

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1990 2.3 stang won't start after sitting a few months got spark, had to jump fuel pump relay to get fuel pump to work got 35-40 psi but when i turn the key the fuel pressure drops.I fixed ground to...

If I remember correctly, the signal for the pump comes from the cam sensor. The pump should run for 3-6 seconds when the key is first turned to the "on" position and then when the ECU registers pulse from the cam sensor it sends the signal to the relay to run the pump. If you have a signal coming out of the cam sensor I would look to ECU replacement.

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Wont start it cranks but nothing happens.wont turn over. put a new what you would call distributor. still nothing.

If the Starter isn't turning the engine over, but you hear a clicking sound, you may have a bad Starter.
If the Starter is turning the engine over, but you are getting no Spark, you may have a failed Camshaft or Crankshaft Position Sensor, or your Timing Belt may have jumped or broken(common on the neons).
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Before you start replacing sensor, double check the Timing belt to ensure it hasn't broken or jumped, and check to see if you are getting a spark or not.

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1 Answer

No spark just assume crank sensor

No spark? If you have a multimeter turn to 20v and unplug cable to coil pack on top of motor. Run positive to middle wire and ground wherever (neg batt terminal) and see what volts you get with key turned to ON (not starting). If 0.0 then either your ASD (MFI) relay is bad or your ECU is not grounding it or it's shot. All power to ignition and fuel pump goes through the ASD relay.

Basically you want to test jumping (bypassing) this relay. Not sure about your model but it has one somewhere. My 95 Talon it's by the brake fluid reservoir (2nd from left by fuel relay). Hotwire 87 to 30.

If still no spark look into crank position sensor, camshaft angle sensor or ECU.

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Continues cranking. Wont turn over. what s my next step?

You mean it cranks but wont start (cranking and turning over are the same thing) When cranking, rap on the fuel tank, if it then runs, the pump is bad and will need to be replaced.

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The click you hear is the fuel pump relay. It gets its signal to energize from the PCM.If you have a faulty Crankshaft Position Sensor, the PCM will not work. Check for a bad fuel pump relay and also all of the other sensors: Camshaft Position Sensor, MAP Sensor, Idle air Control, Intake Air Sensor,etc.

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