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  #1  
Old 10-05-2010, 09:42 AM
Rusty Nib's Avatar
Rusty Nib Rusty Nib is offline
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Default How to test an ECM/PCM?

I started another thread because my truck dies yesterday and one of the suggestions was that my PCM crapped out. If I'm not mistaken, the PCM is the same thing as the ECM.
Before I throw what little money I have at the problem, I'm hoping there is a test I can do to determine if my ECM is really shot.
The gentleman who suggested it might be the PCM said that it could be tested with a voltmeter. I have one but wouldn't know how to go about it and hope someone can take a minute to school me.

Thanks for your time. I really appreciate it. The sooner my baby gets fixed the sooner I can get to work!
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  #2  
Old 10-05-2010, 04:07 PM
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Bumping to keep this active. Have you checked for spark and fuel? Any other info you can provide will help. What was going on when it died?
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  #3  
Old 10-05-2010, 06:47 PM
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Thanks for the bump. Here is a link to the original thread stating the symptoms. http://www.ramforumz.com/showthread.php?t=62933

I have spark and fuel. It will start now bu shudder and die after a few seconds like the timing is severely retarded.

I'm wondering if this can be caused by a faulty catalytic convertor and bad O2 sensors but would like to rule out the PCM if possible.

I found a link on the internet with a simple analog Voltmeter test that can be performed at home on Chrysler products, but I'm not getting ANY of the results they specify to tell whether the ECM is good or bad.

I'm hoping that die hard Dodge guys (and Rams with Hemis in particular) will know the proper procedure and what to look for.

This is really messing me up. I feel like someone close to me is in critical condition and my hands feel tied on how to fix her.
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Old 10-05-2010, 07:14 PM
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Turn the ignition off.
NOTE: The following resistance measurement should be taken at 70-80 F.
Measure the primary resistance of the Coil on plug.
4.7L Ignition Coil Primary resistance is 0.6 to 0.9 of an ohm at 77F (25C).
5.7L Ignition Coil Primary resistance is 0.558 to 0.682 of an ohm at 77F (25C).
Is the resistance within the given specification for the Ignition Coil being tested?

Yes - Go To 4

No - Replace the coil on plug.





4 - Using a 12-volt test light connected to a 12-volt source, probe the Ignition Coil Driver circuit.
Crank the engine for 5 seconds while observing the test light.


What is the condition of the test light while cranking the engine?



Brightly blinking - Replace the Ignition Coil.



ON constantly - Go To 5



OFF constantly - Go To 6



5 - Turn the ignition off.
Disconnect the PCM harness connectors.
Measure the resistance between ground and the Ignition Coil Control circuit in the
Coil on plug harness connector.



Is the resistance below 100 ohms?
Yes -

Repair the short to ground in the Coil Control circuit.




No - Go To 7


6 - Turn the ignition off.

Disconnect the PCM harness connectors.

CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS
RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the Coil Control circuit from the Coil on plug connector to
the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?



Yes - Go To 7



No - Repair the open in the Coil Control circuit.

.

7 - NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.


Using the schematics as a guide, inspect the wire harness and connectors. Pay

particular attention to all Power and Ground circuits.
If there are no possible causes remaining, review repair.



Repair -Replace and program the Powertrain Control Module per Service
Information.




Since you don't have the Miller special tool, you'll need to backprobe the connectors in step 6. The wiring diagram is in my next post.




Last edited by RamTech; 10-05-2010 at 07:16 PM.
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  #5  
Old 10-05-2010, 07:18 PM
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Old 10-05-2010, 07:18 PM
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Old 10-05-2010, 09:16 PM
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Holy crap Man! Thank you so much. I can't wait to get out there and try this tomorrow morning.
Again, thank you.
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  #8  
Old 10-06-2010, 04:47 PM
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"Ask, and ye shall receive."
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