SSDieselSupply.com
SSDPro-Exhaust.com
Results 1 to 6 of 6

Thread: oil sensor/ aux. pump how to test it not oil pressure gauge sending unit

  1. #1
    Join Date
    Nov 2015
    Posts
    6

    Default oil sensor/ aux. pump how to test it not oil pressure gauge sending unit

    trying to test sensor in valley of 6.5 turbo with ohm meter and wire unplugged it shows continuity to ground is this bad or good

  2. #2
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,807

    Default

    The center pin should show resistance to ground, that varies with oil pressure, for the gauge. The outside pins should show open circuit between them with engine stopped and no resistance with the engine running. Your lift pump is OK, so if it doesn't run with the engine running, the OPS is bad. Another test, use a paper clip to connect the outer connections on the plug, the lift pump should run with the ignition off.
    Last edited by grancito; 12-12-2015 at 06:01 PM.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  3. #3
    Join Date
    Nov 2015
    Posts
    6

    Default

    My sensor only has one pin it is the middle one... this is a 2001 turbo 3500 van wonder if the sensor is different or what the connector only has one wire in it too. thanks for the help I am lost

  4. #4
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,807

    Default

    Your van doesn't have an OPS controlled lift pump, it has an inertia cutout switch, which will be located on the body of the van somewhere. I can't find out where.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  5. #5
    Join Date
    Nov 2015
    Posts
    6

    Default

    I have a set of service manuels for the G van it states the glow plugs energize the lift pump on starting then there is a signal from the crank and a back up to it is a ops switch .... wish I could find a complete wiring harness diagram instead of this piece meal crap

  6. #6
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,807

    Default

    Rockauto parts shows an inertia switch, no OPS. Google shows a plastic cover inside the van labeled inertia switch, but not specific for the diesel, look for that.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

Posting Permissions

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