Diagnosing VVA's fault code

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Licensed to kill, Mar 2, 2013.

  1. Licensed to kill

    Licensed to kill Heavy Load Member

    825
    2,432
    Dec 31, 2010
    Alberta
    0
    Barring anything obvious like a broken wire, what tests can be run to determine if the problem is the solenoid, wireing, pressure sensor or.....?
     
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. GrapeApe

    GrapeApe Road Train Member

    2,215
    2,185
    Jan 7, 2013
    0
    What code are you getting? They are known for injector harness issues. The best test for the harness is to disconnect both ends. Jump 12 volts to 1 wire at a time and load test the other end looking for a voltage drop. If you don't have a test lead that can load the circuit, an 1156 light bulb does the trick. You can ohm out the wires, but unless it's really bad or broken, it will show good, even if it's not.
     
  4. Licensed to kill

    Licensed to kill Heavy Load Member

    825
    2,432
    Dec 31, 2010
    Alberta
    0
    I'm getting code 95. SOUNDS like a harness issue from what my engine diagnostic sheet says, 95 indicates #6 actuator current high, low, or not responding, low oil pressure, or oil pressure voltage high or low.
     
  5. maxicruise

    maxicruise Light Load Member

    58
    19
    Aug 11, 2010
    Illinois
    0
    What we have found is that the plug to the connector on the solenoid gets loose. If you can wiggle it around, change it. They make a new pigtail for that problem.
     
  6. GrapeApe

    GrapeApe Road Train Member

    2,215
    2,185
    Jan 7, 2013
    0
    [FONT=Verdana, Tahoma, Helvetica, Arial, sans-serif]Code 95 is for Intake Valve Actuation System Oil Pressure voltage low or high. The most common issue is a failed IVA pressure sensor, located on the right side front of the valve cover base. There is also a solenoid close to it. Check all the plugs and wiring, if nothing is wrong, the next step is to replace the sensor.


    [/FONT]
     
  7. Licensed to kill

    Licensed to kill Heavy Load Member

    825
    2,432
    Dec 31, 2010
    Alberta
    0
    Thanks guys. I hope to have time tomorrow to pull the cover and check it out and if I'm fortunate enough to find the problem I can get parts in town monday. Will keep yall posted. Thanks again.
     
  8. ahmadali04

    ahmadali04 Bobtail Member

    28
    6
    Jan 30, 2011
    0
    I had the same code on one of my trucks this week. I initially thought it was IVA pressure sensor, but it turned out be a be a damaged O-ring on the VVA.The damaged o-ring was restricting the pressure, and causing the code to come up. So, you may want to check that as well.
     
    Licensed to kill Thanks this.
  9. GrapeApe

    GrapeApe Road Train Member

    2,215
    2,185
    Jan 7, 2013
    0
    You shouldn't have to pull any valve covers, the sensor and solenoid are external, on the the front right of the valve cover base.
     
  10. Licensed to kill

    Licensed to kill Heavy Load Member

    825
    2,432
    Dec 31, 2010
    Alberta
    0
    Installed a new oil pressure sensor today and the CEL went out. Awsome. Thanks
     
  11. Superhauler

    Superhauler TEACHER OF MEN

    12,209
    100,704
    Jan 30, 2010
    keep stroking.
    0
    if it pops up again. it could be the pressure sensor failing again. cat has had a problem with those sensors lately. being bad right out of the box.
     
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  • Draft saved Draft deleted