Question about 1994 Oldsmobile Bravada

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Is it the ecm when you get no power after testing everything and it all comes back good

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Possible the ECM may be bad on your vehicle but generally the ecm supplies the ground signal. Make sure to test for power with a test light and not just a dvom or volt meter as it can give a false reading. You may have power or 12vdc but not enough amps to actually carry a load. As long as all the grounds are in order and you have current to power a load then I would definitely start looking at the ecm.

Posted on Oct 11, 2010

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1992 isuzu rodeo has no spark I have changed the coil , the rotor , the spark control modual , the ecm , the pick up coil , still no spark could it be the ecm relay ??


double posted, why?
I guess you are h3ll bent on gue$$ and not testing.
so keep going replace everything, we love to watch.
why not use the diagnostic jumper as posted in your other posting.
why>?
no spark out of coil right.
recap of last answers.
fuses, good, all 7 for ecu +spark good????????
we test them not guess, but ones that look blown are.
CEL Glow key on,?
flash codes ok 5 seconds cranked.
CKP good , the ECU will tell you its bad with flash codes.
why skip this key test??????????????????????????

The ECU must have power ! this is first. not changing out tons of stuff, 12vdc power,, and there are 7 fuses.
i bet you never tested them
or measure all ecu power pins to see if its has power first.
and is FIRST, no brain,(ecu)no spark and then no fueling.
if the CKP is dead, there can be nos spark.
ever.
I can only presume you connected a good new spark plug
to the actual coil tower point, then ground the spark shell.
and cranked and spark really is dead, 100 years, same way.
if dead, check 7 fuses.... seen in the book on car.
log in to mitchells diy. (google that)
and read how it works, its all there, read it.
a schematic to.

Nov 26, 2016 | Isuzu Cars & Trucks

1 Answer

Change the transmission on my 2007 uplander now wont start so I put scanner on it and cannot go in it


That can be a tough one to diagnos , Transmission come from same make , model and year vehicle ? Do you know how to use wiring diagrams ? Free wiring diagram's at http://bbbind.com/free_tsb.html Test power and grounds for PCM/ECM / TCM . Check wire from DLC to PCM etc.... Check your work , everything get hooked back up right ?

Nov 22, 2016 | 2007 Chevrolet Uplander

1 Answer

What would be wrong if i aint got no brake lights but everything is testing good


Hello if the brake light switch is ok and the wiring to the switch which breaks at the conn. all the time. Then you need to remove the taillight and check for power there when stepping on the brake if none trace wires if ok then a bad bulb. If you are local to me I can check this for you within an hour

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1 Answer

I CANNOT GET ANY POWER TO MY FUEL PUMP EXCEPT BY PUTTING AN EXTERNAL POWER SOURCE TO IT. WE HAVE CHECKED THE RELAYS AND EVERYTHING ELSE. WHAT WOULD CAUSE THIS TO HAPPEN WHERE THERES NO POWER TO THE FUEL...


have you check for power to the main fuel relay ,it is near the ECM. it also poers the ECM up. if no power is coming from it then the ECM will not ground the secondary fuel relay to transfer power back to the fuel pump.

Aug 13, 2011 | 2003 Mitsubishi Galant

1 Answer

I am not getting a signal to my fuel pump, fuel pump relay nor the 10 amp fuel pump relay fuse. I have checked my wiring from the ECM to the FPR and it is good. Where does the power come from through the...


The fuel pump relay is powered by a fusible link connected to the starter solenoid on the positive battery terminal. That fusible link feeds the 10 amp fuse near the relay. You can test the fusible links with a 12 volt test lamp. If the fusible link test okay check for an open circuit in the wire between the link and the 10 amp fuse. Hope this gets you fixed.

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1 Answer

My check engine light comes on and the performance is sluggish i did a diagnostic test and the code was po607 now the more i drive the engine shuts off and the battery light comes on


http://www.obd-codes.com/p0607

Looks like either a bad battery or a bad ECM (engine computer). The code is happening because the ECM is losing power. Take the battery out and bring it to Autozone or similar store and have them do a "Load Test". If the battery is good, it may be the ECM that would need replacement.

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1 Answer

Charging System issue!


I had a simular problem, and I have worked on cars for 37 years.
In my case it was the ecm. I tested and tested, come to find out, at higher rpm's, (when car is being driven), the ecm caused the voltage regulator to stay in a high charge situation, which burnt up the alternator, changed it, and was fine.
I'm not saying it will work in your case, but you tried everything else.

Apr 23, 2009 | 1990 Honda Civic

1 Answer

My 1994 suburban engine stops. No fuel, no MIL light.


I checked all of the fuseable links and they were all good. Next I decided to check all the power wires to the ECM and also the grounds from a wiring diagram because the Mil is controlled by the ecm and the bulb was good. The ecm is located behind the glove box. Bingo, the orange wire was only reading 3-5 volts at the ECM, but 12.5 volts after the fuseable link at the underhood fuse block (passenger side firewall). I ran a temp wire directly from after the fuseable link to the orange wire at the ecm and the ecm turned back on and the Mil or "check engine soon" light came on too. The truck started up and has never run smoother.

Note that at first the truck just stalled out and I could restart it right away with no error codes. Eventually the stalling became more frequent with longer reset times required. Once it threw a "code 54" and I thought it was fuel related as each time the gas stopped and I could still start the truck with gas poured into the TB. Ignition ok. My fuel pump turned on and ran if I tested it. I even checked the pressure regulator and the fuel filter to no avail.The orange wire that powers up the ecm is technically part or the fuel pump relay circuit as it also feeds the fuel pump relay 12.5 volts all the time. The thin orange wire from the fuse block is joined to two other thin orange wires in the large group of wires that heads to the ecm along the firewall behind the engine. I had to dig it out of the many wires to find it and remove a lot of tape. It is amazing to me that this one little orange wire could cause so much grief and be so hard to track down. I could not have afforded to take this problem to the Dealer.

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5 Answers

No glow plug light, car turns over but won't start, no CEL or codes


I don't have the solution but a possible help in diagnosing.  If you remove the water temperature sensor connector from the sensor, the glow plug light should stay on when you go to start the car.  Try leaving it on for 15 seconds and then start the car.  If it starts right away, it is your sensor.  If it doesn't, the good luck.  
The sensor is located on the right side of the engine near the top, at the back.  It is in the coolant fitting directly behind the hose from the rad, just left of the thermostat.  Be careful to disconnect the wires, and not remove the sensor, or you will loose a lot of coolant.  The sensor is held in by a separate plastic clip, and the harness just has a little built in clip on the side.  Hope you have small hands...

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