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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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.

Sep 11, 2016 | 2004 Mercedes-Benz C 180

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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.

Sep 13, 2013 | Cars & Trucks

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

1994 Chevrolet Astro It takes 2 to 5 cranks to start. Each crank turns the cars electrical stuff on and revs the engine however it doesnt start.What is the issue?


Either you are not getting spark or not getting fuel. A bad crankshaft position sensor would cause no spark at all. You can pull one spark plug, place it back on the plug wire. Lay the plug electrode next to a metal surface. Have someone else crank over the engine while you observe for spark. You should see a spark jump from plug to the metal surface. (plug electrode should be no more than 1/4" away) If you don't have spark, put the plug back in and move on to the next plug and try that one. (the correct way is to use a spark tester) If you have no spark in any plug, you may want to test the crankshaft position sensor with an ohmmeter. You can also use a meter to test power at the ignition module.
If you find that you do have spark in every plug, then it's possible that you don't have fuel. There is a fuel pressure test port on the fuel rail. There is a cap and a valve. With the key in ON position ,you can place rag over the test port, press in on the valve and there should be fuel that comes out meaning there is fuel pressure. (the correct way is to use a fuel pressure gauge if you have one)
If you find there is no fuel pressure, turn the key off and back on again. You should hear the fuel pump. If you can hear the fuel pump, then it is working. That means you may have a plugged fuel filter or faulty fuel pressure regulator. If you do not have hear the fuel pump, check the fuse and fuel pump relay. You can test the relay and a fuse with an ohmmeter on the ohm setting. You can also use a voltmeter and check power to the relay and also to the fuel pump to test for 12 volts. If you have power to the pump but the pump is not running, it is likely faulty. If you don't have power to the pump, then either the relay or fuse is bad. If they test out ok, then test power from ECM.

These are the most common causes of a no start. If you have any bad sensors of any sort, it would likely set of the check engine light. Then the computer should be tested for engine codes which can be done with a scan-tool.

Jun 18, 2010 | 1994 Chevrolet Astro

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.

Mar 21, 2009 | 1995 Jeep Cherokee

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