Question about 1994 Chevrolet Astro

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How to replace ecm

Will not run

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Check the fuse for the ecm before replacing it. If you have a ford eec diagnostic try to get the codes. If you don't have a eec code reader there is a way to get the codes out by counting dashboard blinks. If you can get the ecm to output the codes the ecm is not bad.

Posted on Apr 02, 2014


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Posted on Jan 02, 2017


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I have replaced two two camshaft sensors on my 2007 Saturn outlook Xr for code 336 and no results please help

Who replaced the sensor ? You or a repair shop ? The DTC P0336 does not say to replace a sensor . You do not have access to the diagnostic trouble code diagnostic's . Your best bet ,take it to a qualified repair shop .
DTC P0336: Crankshaft Position (CKP) Sensor Performance
CKP Sensor Signal Circuit

• The ECM detects that the engine is running, but receives less than 51 or more than 65 CKP sensor pulses each engine revolution for 8 of 10 engine revolutions.
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Can a faulty ECM cause engine and transmission problems?

Yes -- but to find that out you have to run the fault codes
Unless you have had a serious fault (battery connected wrong-power surge ),the ECM is the last item to check
battery was flat or replaced the normally resetting the ECM and CPU programs with a scanner will fix ECM problems.

Mar 29, 2015 | Cars & Trucks

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I have a 1990 nissan 240sx. It sat for 10 years. 36000 miles on it. I have replaced fuel pump n filter, full tune up, ECM, all injectors and starter. It does start but will idle high but will not stay...

if you have changed the ECM it is possible that you will have to reset/reprogram the ecm to the sensors of the vehicle. Find a nissan shop that has the ability to reprogram the ecm and reset it.

Dec 27, 2014 | Cars & Trucks

1 Answer

Have had a 302 runs rough have done EGR cleaned and replace. New cap plugs wires replace vac hose to map EGR cleaned and checked tps iac fuel filter new have replaced ECM new. Every thing checks out have...

You don't give the year built, but back when ECM where first introduced it was known that the vehicle would run rough for await till the ECM had time to learn so of speak, by driving on the road. We had to drive down the road a few miles first to get running right on it's own.

May 20, 2014 | Cars & Trucks

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Low voltage

Have you tried fixing the errors that the ECU is reporting?

Aug 13, 2012 | 2004 Nissan Sentra

1 Answer

Need to know if after replacing a faulty ECM unit with a used unit, does the replacement unit need to be professionally reprogrammed or serviced in any way?

You should just have the correct ECM and PROM inside of it.
When battery power is removed from the ECM it will reset to factory defaults. When you install it and start the vehicle it may run rough. Some drive and key cycles will "relearn" the ECM.
I have seen a number of vehicles do this just after replacing the battery.

Oct 09, 2011 | 1990 Buick Regal

1 Answer

Help ! A new ECM was replaced on my 1994 Town car. The car ran great before the the computer went down. I had new plugs, wires, a fuel system cleaning, and etc. The car still runs great. It really...

The new ECM may have a different mapping that has caused the loss in MPG. I have not really messed with the Ford ECM's in this way. I have done GM and they have a removable and replacable PROM.

Look into if your ECM was replaced with a new PROM. Was your ECM replaced and your old PROM used. Is there anyone local to you that can reprogram the ECM or can a dealer install a new map program.

Sep 19, 2011 | 1994 Lincoln Town Car

1 Answer

I have a 1990 exel gls with a 1.5 4 cylinder port fuel injected. The original ecm would no longer run the engine, but will still comunicate with my scanner. I have tried 2 different ecm's which will run...

Heres a TiP for ECM malfunction!
Replace all the CAPACiTOR inside ur OLD ecm, 'cause thats the part of the circuit that breaks down!
I have repaired a LOT of ECM, and it works!
Try that if u couldn't get a NEW one!

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97 gmc sierra no fuel no spark replaced ign module and pickup coil still no spark

1996 GMC 1500 Pickup.
Replaced Coil, Dist cap/Rotor, Ign Mod & pick-up.
All showed to be bad with OHM meter.

20A ECM-B fuse keeps blowing out and I'm afraid to burn these new parts up....


Mar 31, 2009 | GMC Sierra 1500 Cars & Trucks

1 Answer

1998 town and country. Installed a new compter now engine turns over but no start and run.

If it ran before the ecm switch then its the new ecm. If the ecm was replaced because it would not run then were looking at a different problem.

Jan 12, 2009 | 1998 Chrysler Town & Country

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