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Home >> Chrysler >> 2011 >> 300 Base, Gas >> Repair and Diagnosis >> External Pages >> Different car >> Section 100 (6.7L Diesel - DTCS - P21C4 To U1601 - 3500 Cab & Chassis) >> Diagnosis and Testing >> P2579-Turbocharger Speed Sensor Circuit Performance >> Testing >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. DTC ACTIVE 
    1. With vehicle in park/neutral, use the accelerator pedal to accelerate the engine speed to 3100-3200 RPM and hold the engine speed for at least 60 seconds.
    2. Return to idle for 60 seconds and then repeat.

      Does P2579 become active?

      Yes 

      • Go To  2.

      No 

  2. INCORRECT BOOST PRESSURE SENSOR INSTALLED 
    1. The CAC/Boost Pressure Sensor and Intake Air Temperature/Intake Air Pressure Sensors are similar but have different part numbers. If the Boost Pressure Sensor was replaced with the wrong part, this DTC can be set.
    2. Verify the part number of the Boost Pressure Sensor.

      Is the Boost Pressure Sensor part number correct?

      Yes 

      • Go To  3.

      No 

  3. TURBOCHARGER SPEED SENSOR 
    1. Turn the ignition off.
    2. Disconnect the Turbocharger Speed Sensor harness connector.
      NOTE:

      Check connectors - Clean/repair as necessary.

    3. Measure the resistance of the Turbo Speed Sensor by probing (K540) Turbo Speed Sensor Signal circuit and the (K541) Turbo Speed Sensor ground circuit at the Turbocharger Speed Sensor.

      Is the resistance between 600 and 1600 Ohms?

      Yes 

      • Go To  4.

      No 

      • Replace the Turbocharger Speed Sensor in accordance with the service information.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  4. CHECK FOR HIGH RESISTANCE IN THE (K540) TURBO SPEED SIGNAL CIRCUIT 
    1. Disconnect the PCM C1 harness connector.
    2. Measure the resistance of the (K540) Turbo Speed Sensor Signal circuit between the PCM C1 harness connector and the Turbocharger Speed Sensor harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Repair the (K540) Turbo Speed Sensor Signal circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .

      No 

      • Go To  5.
  5. CHECK FOR HIGH RESISTANCE IN THE (K541) TURBO SPEED SENSOR RETURN CIRCUIT 
    1. Measure the resistance of the (K541) Turbo Speed Sensor Return circuit between the Turbo Speed Sensor harness connector and the PCM C1 harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  6.

      No 

      • Repair the (K540) Turbo Speed Sensor Signal circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  6. POWERTRAIN CONTROL MODULE 
    1. Reconnect the PCM C1 harness connector.
    2. Start the engine.
    3. With vehicle in park/neutral, use the accelerator pedal to accelerate the engine speed to 3100-3200 RPM and hold the engine speed for at least 60 seconds.
    4. Return to idle for 60 seconds and then repeat.

      Does DTC P2579 become active during engine operation?

      Yes 

      • Replace the Powertrain Control Module in accodance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .

      No 

      • The problem may have been corrected when the harness connections were re-connected. Be certain that the PCM and chassis grounds are in good condition.
      • Perform the INTERMITTENT CONDITION - 6.7L diagnostic procedure. Refer to INTERMITTENT CONDITION - 6.7L .
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