Results 1 to 3 of 3

Thread: Unable to pull obd1 codes

  1. #1
    Join Date
    Aug 2005
    Posts
    192

    Default Unable to pull obd1 codes

    It's been a long time now since my last post, like many years I think. Tried to pull codes on my 1995 6.5TD K3500 using the old paper clip method by shorting the top 2 RH pins on the dlc. Dash light will not flash anything at all. How can I check power to the obd1 dlc? Not sure which pin is the 12V. The upper Right?
    Black 95 6.5TD, 929 block, 173k miles, 65k on IP, 48k miles on self-rebuilt engine done in '09, 6 L&S Full-torque inserts in outer main crank holes, Clearwater heads, Fluidamper, rebuilt NV4500, 3" downpipe, 4" exhaust, no cat, dual T-stats, 9 blade fan, spin-on 180 degree clutch, Heath hi-flow water pump and turbomaster, PMD relocated, OPS relay mod, Heath PROM upgrade, and Kennedy headlight harness upgrade soon. Now use semi-syn Lucas 2-cycle oil every fill-up which greatly reduces the frequency of DTC 35-36 codes the PCM/ECM throws.

  2. #2
    Join Date
    Oct 2001
    Location
    Granby, Missouri, USA
    Posts
    3,081

    Default

    Does your "Service Engine Soon" light come on when you first turn the key to the run position? Wondering if the bulb is burned out...

    I just purchased the GMTD Scan software and OBD1 to USB cable for my 1995. It's pretty sweet. I finally got my timing and TDCO set, and was able to read and clear codes. I can even manually illuminate the SES light to make sure it works.

    Casey
    1995 K1500 Tahoe 2 door, 6.5LTD, 4L80E, NP241, 3.42's, 285/75R16 BFG K02's; 1997 506 block; Kennedy OPS harness, gauges, Quick Heat plugs, and TD-Max chip; Dtech FSD on FSD Cooler; vacuum pump deleted, HX35 turbo, Turbo Master, 3.5" Kennedy exhaust, F code intake; dual t/stats, HO water pump, Champion radiator; Racor fuel filter

  3. #3
    Join Date
    Aug 2005
    Posts
    192

    Default

    SES light does work, so bulb is OK. But, coincidentally, I just downloaded the basic version of the GMTD software myself. Now waiting on a cable to be delivered from a separate vendor. Hope it works! Thanks for the suggestion.
    Black 95 6.5TD, 929 block, 173k miles, 65k on IP, 48k miles on self-rebuilt engine done in '09, 6 L&S Full-torque inserts in outer main crank holes, Clearwater heads, Fluidamper, rebuilt NV4500, 3" downpipe, 4" exhaust, no cat, dual T-stats, 9 blade fan, spin-on 180 degree clutch, Heath hi-flow water pump and turbomaster, PMD relocated, OPS relay mod, Heath PROM upgrade, and Kennedy headlight harness upgrade soon. Now use semi-syn Lucas 2-cycle oil every fill-up which greatly reduces the frequency of DTC 35-36 codes the PCM/ECM throws.

Similar Threads

  1. obd1,software
    By westport70 in forum 6.5L Turbo Diesel - Tech Support - Troubleshooting - Performance
    Replies: 4
    Last Post: 03-26-2010, 16:19
  2. obd1
    By 3ace in forum 6.2L Diesel - Tech Support - Troubleshooting - Performance
    Replies: 5
    Last Post: 02-03-2010, 11:51
  3. My 6.2L is unable to start
    By bigboy3sa in forum 6.2L Diesel - Tech Support - Troubleshooting - Performance
    Replies: 3
    Last Post: 04-26-2008, 13:39
  4. Unable to set timing
    By jonflies in forum 6.2L Diesel - Tech Support - Troubleshooting - Performance
    Replies: 14
    Last Post: 03-30-2005, 13:58
  5. Unable to stop air flow in back vents
    By A||||1||Robert W. Jones||Diesel Timing Light?||||5||||Stray Cat||00012887 in forum 2500HD/3500 HD Trucks & Drivetrain
    Replies: 3
    Last Post: 06-05-2003, 21:37

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •