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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2 Answers

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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No fuel pressure and no spark


Fuel and spark circuits tend to be separate. A faulty crank and/or cam sensor will stop the spark and injection signal but unlikely, I think, that it will completely stop the fuel pump.

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.

I suggest you check the fuses. There is sometimes several associated with engine management, fuel pump and suchlike.

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Crown vic 2005 no start replaced fuel pump


check your crankshaft position sensor. fuel+spark+compression+timing=ignition.

Mar 13, 2014 | Cars & Trucks

1 Answer

My 1kz prado is not starting opened the injector nozzle no fuel comes when engine is cranked. Had a diagnosis fault fuel control sensor relay changed it but still no fuel come on the nozzle. Please advise...


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.

Dec 18, 2017 | 1990 Ford Mustang

2 Answers

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).
If the Starter is turning the engine over, but you are getting Spark, you may have a failed fuel pump, fuel pump relay, or fuel pressure regulator.

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.

Mar 12, 2011 | 2003 Dodge Neon

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.
 

Aug 25, 2010 | 2000 Mitsubishi Eclipse

2 Answers

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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2 Answers

Car will not start


you getting sparks; check the basic from fuse and relay. Its seems like you not getting any fuel by having to give it fuel, check the fuel pump see if it working, you can remove it and connect straight to 12v and do a jump. If the fuel pump is good then it will be the crank sensor, crank sensor turn on the fuel pump as long the engine continue turning over. what crank sensor does it sense the crank/flywheel turning and it send single to the computer than computer send power to the fuel pump. sensor tend to go bad over time and heat exposure; the sensor it fairly cheap to replace.

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2 Answers

Jeep won't start until a clicking sound comes from fuse box


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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