Hello, Allpar Forums member or visitor! If you were a member, you would not see this ad!

Register or log in at the top right of the page...

  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

86 Laser, fault codes

Discussion in 'Daytona and Laser' started by Laser86, Jun 6, 2017.

  1. Laser86

    Laser86 Member

    Joined:
    Apr 10, 2015
    Messages:
    103
    Likes:
    3
    Ok, so I am getting an intermittent " power limited " icon, did the 3 on 3 off with the ignition switch and got :

    2 - 4
    2 - 6
    5 - 5

    anybody know what that may be ?
     
  2. Bob Lincoln

    Bob Lincoln "CHECK FAULT CODES"
    Level 2 Supporter

    Joined:
    Jul 10, 2002
    Messages:
    29,944
    Likes:
    3,331
    Chrysler Computer Codes, 1980s-1990s (at http://www.allpar.com/fix/codes/index.html )

    Code 24 Throttle Position Sensor (TPS) signal out of range
    Code 26 1985 + Turbo models: engine injector driver circuit one shorted or open
    TBI models: injector peak current not achieved

    I would check first and foremost for a bad ground connection - at all ground cables from the negative post to the block, fenderwell; the braided strap from firewall to engine; strap across the passenger side engine mount. If all are good, it's probably a bad or intermittent contact at the plug that connects to the computer underhood. The contacts in the harness side are Molex brand KK contacts, and they are known to fracture or relax their spring force and cause intermittent contact.
    Also check the harness to the injectors and throttle body for heat damage, cracking of insulation, etc.

    Very, very unlikely to be the TPS and injectors, or the computer itself.
     
  3. Laser86

    Laser86 Member

    Joined:
    Apr 10, 2015
    Messages:
    103
    Likes:
    3
    What do you mean by this ? " the plug that connects to the computer underhood ". Where exactly ? Where it passes through the firewall, does it pass through the firewall ? I think I remember some kind of plug that went through the firewall, with a bolt through it ....

    And this ? " The contacts in the harness side ". In the engine compartment ? Is the connector / plug in the engine compartment with female connectors ?

    And how do you repair " known to fracture or relax their spring force " ?
     
  4. Bob Lincoln

    Bob Lincoln "CHECK FAULT CODES"
    Level 2 Supporter

    Joined:
    Jul 10, 2002
    Messages:
    29,944
    Likes:
    3,331
    The computer is mounted next to the battery and has, I believe, a 60-position connector attached to it. The computer has the male pins, the plug has the female contacts, which look like this:
    [​IMG]

    The male pin is supposed to scrape across the top of the ramp and press it downward to make contact. That "ramp" can lose spring tension or it can fracture, so that it sits inside the plug and makes intermittent contact. A friend had that happen and it caused an intermittent code 24 and high idle for years before he found the trouble.
    To fix it, you have to press the contact out of the plug, cut the contact off and crimp on a new one. Digikey, Mouser, Arrow all carry these.
     
  5. GLHS60

    GLHS60 Well-Known Member

    Joined:
    Jun 23, 2008
    Messages:
    1,403
    Likes:
    374
    Concerning a 1986 Laser:

    The bulkhead connector has a bolt through it and is located near the brake booster.

    The Power Module is located beside the battery.

    The Logic Module (computer) is located behind the passenger's kick panel.

    The wiring to it passes through a large grommet in the firewall.

    The L.M. wiring connectors are very often the source of odd issues.

    The MAP was originally attached to it but many were retrofitted to under the hood.

    There are cases where people have to leave the L.M. loose laying on the floor to operate properly.

    Obviously not a repair but is a solution for some and a place to start checking.

    From 1988 on the L.M. was incorporated within the unit beside the battery.

    These later units have proven very reliable.

    Thanks
    Randy
     

Share This Page

Loading...