Jump to content
Forums Gone... but not forgotten!
Pontiac of the Month

Jack Leslie's 1957 Sedan Delivery

2024 April
of the Month

  • Rev up your passion for Pontiacs and join our vibrant community of enthusiasts!

    Whether you're a die-hard fan of classic muscle cars or you've got a soft spot for sleek modern models, you've found your home here at Forever Pontiac. Our community is dedicated to celebrating everything Pontiac, from the iconic GTO to the legendary Firebird and everything in between.

    Unlock access to expert advice, stunning photo galleries, engaging discussions, exclusive events, and more!

    Start your Pontiac journey with us today!

    Sign up now! 🏁

2001 gtp special edition


Recommended Posts

Tired of these Ads? Register Today!

' timestamp='1326939858' post='65247']

Tire bags FTW.

Those things are so weird. Wait... we are talking about the same thing right?


/>http://www.youtube.com/watch?v=WYjIDvSdzHQ&feature=player_embedded

Link to comment
Share on other sites

  • 3 weeks later...

P0620

Description

Generator Performance

The power control module (PCM) output (L) terminal to the alternator determines when the alternator will be turned off. The alternator is on under all normal vehicle operating conditions except during the low RPM conditions. The alternator is turned off during low RPM conditions in order to remove the load from the engine.

The PCM input field (F) terminal from the alternator provides a 400 Hz pulse-width modulated (PWM) signal to the PCM. The duty cycle of the F terminal mimics the duty cycle of the field coils in the alternator, thus, the F terminal duty cycle indicates the relative electrical load on the alternator.

The alternator telltale lamp will illuminate any time the ignition is on and the engine is not running. The telltale lamp will turn off after the engine is running and the alternator is putting out the desired amperage.

Symptoms

  • The PCM will not illuminate the malfunction indicator lamp (MIL).
  • The PCM will store the conditions, which were present when the DTC set as Failure Records Data only. This information will not be stored as Freeze Frame data.

Causes

  • The L terminal voltage is low while the PCM is commanding the generator on.
  • The above condition is present for more than 30 seconds.

-OR –

  • The F terminal PWM is less than 5 percent.
  • The engine RPM is less than 2500
  • The above conditions are present for more than 30 seconds.

Solutions

Check for the following conditions:

  • A faulty connection at the PCM – inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connections.
  • Inspect the wiring harness for damage.
  • Several steps prior to below require a Scan tool to command the generator on and to verify voltage which may indicate a problem with the starting and charging engine electrical system.
  • Test the L circuit for a short to voltage. Were problems found?
    • YES – Repair as necessary and clear DTC
    • NO - Test the F circuit for an open or a short to ground. Were problems found?
      • YES – Repair as necessary and clear DTC

      [*]NO - Test the F circuit for a short to voltage. Were problems found?

      • YES – Repair as necessary and clear DTC
      • NO – Check for a faulty connection at the PCM. Were problems found?
        • YES - Repair as necessary and clear DTC
        • NO – Replace the PCM.

Link to comment
Share on other sites

try the p0102 code.... i got that little gem early last week when the car stalled out at 70mph on the interstate, 3500lb sled anyone. You get that code, dont dick with it, just replace the damn thing. lol

Link to comment
Share on other sites

try the p0102 code.... i got that little gem early last week when the car stalled out at 70mph on the interstate, 3500lb sled anyone. You get that code, dont dick with it, just replace the damn thing. lol

do u have a k&n air filter?
Link to comment
Share on other sites

:woot: cant beat free!

That's what Jim says every time he thinks of paying us Ghost. :angry:

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Tired of these Ads? Purchase Enhanced Membership today to remove them!
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.