ECM

Asked by Doug May 08, 2019 at 12:05 PM about the 1999 Pontiac Firebird Trans Am Convertible

Question type: Maintenance & Repair

Car wont charge battery...ECM???....alternator and battery are new and have
been tested

1 Answer
2,570

Sirkut_Interrupted answered 4 years ago

With the car running take a voltage measurement of the red L circuit wire on the alternator... you should see battery voltage coming from the pcm.. if not that doeant mean the pcm is faulty, you need to test for voltage at the pcm itself.. if you have no voltage to the L circuit u can also jump it from battery positive and the alternator should kick on

Mark helpful

Your Answer:

Related Questions

  • ECM 1 Answer

    Car wont charge battery...ECM???....alternator and battery are new and have been tested

    1999 Pontiac Firebird Trans Am Convertible

    -

    Maintenance & Repair

  • Where's my ecm fuse at ? 1 Answer

    Where is the ecm fuse on a 1994 firebird ?

    1994 Pontiac Firebird Base

    -

    Maintenance & Repair

  • 1991 Firebird V8 5.0 ECM location and does it need to be flashed? 1 Answer

    Hello, so I had a short somewhere and basically it ended up frying my computer on my 1991 firebird. I was trying to figure out where the ECM is located, and if I can just slap another one in there a...

    1991 Pontiac Firebird Base

    -

    Maintenance & Repair

  • pontiac firebird ecm failure.why? 4 Answers

    hi guys. my 1983 5.o crossfire blew an ecm.until this point car was running fine.checked for obvious bare wires etc,found nothing.jumped terminals A+B can't extract a code [seems like it's that part o...

    1983 Pontiac Firebird

    -

    Maintenance & Repair

  • where is ECM located? 3 Answers

    1983 Pontiac Firebird

    -

    Maintenance & Repair

Shortcuts

Search Pontiac Firebird Questions

CarGurus Experts

  • #1
    Samuel Moore
    Reputation
    1,590
  • #2
    taver91
    Reputation
    1,320
  • #3
    Paul Martin
    Reputation
    1,270
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Camaro
22 Great Deals out of 471 listings starting at $11,999
Used Chevrolet Corvette
29 Great Deals out of 782 listings starting at $15,900
Used Ford Mustang
42 Great Deals out of 1,614 listings starting at $8,995
Used Chevrolet Silverado 1500
177 Great Deals out of 7,423 listings starting at $6,995
Used Ford F-150
301 Great Deals out of 13,535 listings starting at $3,888
Used GMC Sierra 1500
128 Great Deals out of 7,841 listings starting at $5,500
Used Porsche 911
19 Great Deals out of 242 listings starting at $22,980

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.