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Cx 210 fault 115

Discussion in 'Excavators' started by Buddy bufas, Jan 9, 2021.

  1. Buddy bufas

    Buddy bufas New Member

    Joined:
    Aug 6, 2016
    Messages:
    1
    Location:
    Arkansas
    Fault code 115 is active and I changed out the speed sensor and still acts the same. Wire A has 5 volts with the key on, wire C has a signal at the computer while it’s running. When key is on wire A&B have 5 volts like it should. Anything that I’m missing?
     
  2. GaryHoff

    GaryHoff Senior Member

    Joined:
    Feb 25, 2009
    Messages:
    808
    Occupation:
    Heavey Equipment Mechanic
    Location:
    Alberta, Canada
    115 code cummins.jpg

    Circuit Description

    The engine speed sensor provides engine speed information to the electronic control module (ECM). The sensor
    must be powered up by (+) 5 VDC to operate. The sensor generates its signals by sensing the movement of target
    teeth machined into a tone wheel that is mounted to the crankshaft. The tone wheel has 35 teeth and a gap where
    the 36th tooth would be placed. This missing tooth indicates that cylinder 1 (and 6) is at top dead center.
    Component Location
    The engine speed/position sensor is located on the intake side of the engine block, between cylinders 4 and 5.
    Shop Talk
    This fault code will also cause a fuel derate. This could be the cause of low-power complaint. Also, this fault code
    can cause starting problems in cold weather.
     
    mg2361 and LACHAU like this.
  3. GaryHoff

    GaryHoff Senior Member

    Joined:
    Feb 25, 2009
    Messages:
    808
    Occupation:
    Heavey Equipment Mechanic
    Location:
    Alberta, Canada
    Pin B should be ground (return)

    The 5V power is shared by other sensors also. Perhaps you have a bad harness to another sensor, and are losing the 5V power.

    Sounds like you have some signal at the ECM from your speed sensor.
    Try unplugging your engine position sensor, and see what happens. Might have a bad signal coming from the other speed sensor.

    Any other fault codes?
    I'm assuming your engine is de-rated
     
    Last edited: Jan 10, 2021
    mg2361 likes this.
  4. GaryHoff

    GaryHoff Senior Member

    Joined:
    Feb 25, 2009
    Messages:
    808
    Occupation:
    Heavey Equipment Mechanic
    Location:
    Alberta, Canada
    5.9 cummins pic.jpg


    1. Engine Air Inlet
    2. VP44 Connector
    3. 23-pin OEM Connector
    4. High-Pressure Fuel Lines
    5. Intake Manifold
    6. VP44 Relay-OEM Mounted
    7. 3/4 NPTF (in) Water Heater (optional)
    8. Magnetic Pickup Location 3/4 to 16 UNF
    9. Fuel Inlet Connection
    10. Fuel Lift Pump
    11. WIF Sensor
    12. Crankcase Breather
    13. Engine Position Sensor (EPS)
    14. Fuel Filter/Water Separator
    15. Oil Pressure Sensor
    16. Fuel Water Drain
    17. Electronic Control Module (ECM)
    18. 1/8 NPTF (in) Oil Pressure
    19. Engine Position Sensor
    20. Engine Dataplate
    21. Fuel Injection Pump
    22. Intake Air Preheater (optional)
     
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