Not recognizing ecm - Chevy Impala SS Forum
 
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post #1 of 7 (permalink) Old 11-26-2018, 06:49 AM Thread Starter
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Not recognizing ecm

Im working on a buddys 96 impala ss. With no start fault. Dash does not light up warning light and only displays km turn indicaters are fuctional. Starter turns over with remote. Not able to recognize ecm thru obd2 yes cig lighter fuse good all other fuses are good. I tested key it has proper resistance. Pass key fuses are reciving power when key switched to start But no start. Haynes manuials does not have test points to test pins for anti theft module. Relay tested good. Is this module able to be tested?
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post #2 of 7 (permalink) Old 11-26-2018, 11:07 AM
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Quote:
Not able to recognize ecm thru obd2 yes cig lighter fuse good all other fuses are good.
This may be your scan tool and not a car issue. The PCM is not disabled by the VATS(pass key). Your PCM will still work if the VATS module is not working.


Quote:
Starter turns over with remote.
I suggest that you trace the yellow starter wire from the ignition switch(base of column) to the remote starter. Remote starters usually just bypass the starter switch. Why can the remote crank the starter but not the key switch? The VATS module may not be involved in your problem.


Remote starters have to do many things to start the car. Some have a "Anti Grind" feature to prevent key starts after a remote start. This means a relay cuts power from the key. A malfunctioning RemSt or it's starter relay(s) can stop a car from key starting. Some go into a "Anti Theft" mode and block the key start.



The other RemSt problem is with the VATS system. A remote start "bypasses" the key and substitutes a resistor for the key resistor. You should check this relay is working properly. It may be causing the VATS to not "see" the key resistor.


Quote:
Dash does not light up warning light and only displays km turn indicaters are fuctional.
When the key is turned to run the MIL,ABS,SIR,Brake, and VATS should all light up. Theses are separate systems.



Quote:
Is this module (VATS)able to be tested?
When cranking the relay coil should have power. There is no use checking for the VATS to PCM pulse signal if the VATS does not power the VATS starter relay.


Again I recommend that you are sure the remote starter is not sabotaging the car.


You mentioned km, what part of Canada are you in?

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Last edited by Z09B4U; 11-26-2018 at 11:12 AM.
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post #3 of 7 (permalink) Old 11-26-2018, 12:19 PM Thread Starter
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For the starter able to turn over i used a trigger jumper to verify that the starter ws in deed still fuctional. There is no remote start for it
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post #4 of 7 (permalink) Old 11-26-2018, 12:20 PM Thread Starter
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Not in canada dash will not switch back to miles
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post #5 of 7 (permalink) Old 11-26-2018, 12:22 PM Thread Starter
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As i stated no other dash light illuminate when key switched to run position
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post #6 of 7 (permalink) Old 11-26-2018, 01:09 PM
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Quote:
Not in Canada dash will not switch back to miles

As i stated no other dash light illuminate when key switched to run position

Not able to recognize ecm thru obd2
It looks like you have more than one problem. Maybe it would help if you gave us some car history. Please be detailed with your information as there can be huge misunderstandings.(IE I tested the starter with a jumper is way different than saying: Starter turns over with remote)


If you have the dash apart far enough to unplug the VATS module: Unplug the connector and probe the PPl/White and White/Black wires. With the key in you should see the key resistance.


Quote:
Haynes manuials does not have test points to test pins for anti theft module.
Goldswaggon diagrams


Is the next best thing to a FSM. Have a look at:impala pass key non SEO

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post #7 of 7 (permalink) Old 11-28-2018, 12:56 PM
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Did you check the Park/Neutral switch?

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