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Home >> Chrysler >> 2011 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 971 (6.7L Diesel - DTCS P0305 To P063C - 2500 Hd & 3500 Hd) >> Diagnosis And Testing >> P0405-EGR Position Sensor Circuit Low >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. ACTIVE DTC 
    NOTE:

    The EGR Valve harness connector is difficult to lock on to the valve. A connector not locked on completely will cause this DTC to set.

    NOTE:

    If there are any 5-Volt supply DTCs present, repair those DTCs before proceeding.

    1. Turn the ignition on.
    2. With the scan tool, record all Freeze frame data.
    3. With the scan tool, erase DTCs.
    4. Turn the ignition off for 75 seconds.
    5. Start the vehicle. It may be necessary to drive vehicle to reset DTC.
    6. With the scan tool, read DTCs.

      Did the DTC reset?

      Yes 

      • Go To  2

      No 

  2. CHECK THE (K834) 5-VOLT SUPPLY FOR AN OPEN/HIGH RESISTANCE 
    Fig 1: Measuring Voltage Of 5-Volt Supply Circuit At EGR Valve Harness Connector
    GC0110894Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the EGR Valve harness connector.
      NOTE:

      Check connectors - Clean/repair as necessary.

    3. Turn the ignition on, engine not running.
    4. Measure the voltage of the (K834) 5-Volt Supply circuit at the EGR Valve harness connector.

      Is the voltage reading 5.0 Volts?

      Yes 

      • Go To  3

      No 

  3. CHECK THE EGR POSITION SIGNAL CIRCUITS FOR A SHORT TO VOLTAGE 
    Fig 2: Checking EGR Position Signal Circuits For A Short To Voltage
    GC0110898Courtesy of CHRYSLER GROUP, LLC
    1. Measure the voltage of the (K683) EGR Position Sensor Signal 1 circuit at the EGR Valve harness connector.
    2. Measure the voltage of the (K685) EGR Position Sensor Signal 2 circuit at the EGR Valve harness connector.
    3. Measure the voltage of the (K687) EGR Position Sensor Signal 3 circuit at the EGR Valve harness connector.

      Is the voltage above 2.0 Volts?

      Yes 

      No 

      • Go To  4
  4. CHECK THE (K934) SENSOR GROUND FOR AN OPEN/HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Disconnect the PCM C1 harness connector.
    3. Measure the resistance of the (K934) Sensor Ground circuit between the EGR Valve harness connector and the PCM C1 harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  5

      No 

  5. CHECK THE EGR POSITION SIGNAL CIRCUITS FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (K683) EGR Position Sensor Signal 1 circuit between the EGR Valve harness connector and the PCM harness connector.
    2. Measure the resistance of the (K685) EGR Position Sensor Signal 2 circuit between the EGR Valve harness connector and the PCM harness connector.
    3. Measure the resistance of the (K687) EGR Position Sensor Signal 3 circuit between the EGR Valve harness connector and the PCM harness connector.

      Is the resistance less than 5.0 Ohms?

      Yes 

      • Go To  6

      No 

  6. CHECK THE EGR POSITION SIGNAL CIRCUITS FOR A SHORT TO GROUND 
    Fig 3: Checking EGR Position Signal Circuits For A Short To Ground
    GC0110901Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between ground and the (K683) EGR Position Sensor Signal 1 circuit at the PCM harness connector.
    2. Measure the resistance between ground and the (K685) EGR Position Sensor Signal 2 circuit at the PCM harness connector.
    3. Measure the resistance between ground and the (K687) EGR Position Sensor Signal 3 circuit at the PCM harness connector.

      Is the resistance less than 10k Ohms?

      Yes 

      No 

      • Go To  7
  7. CHECK THE EGR VALVE 
    1. Reconnect the PCM C1 harness connector.
    2. Replace EGR Valve in accordance with the Service Information. Refer to VALVE, EXHAUST GAS RECIRCULATION (EGR), 6.7L DIESEL, REMOVAL .
    3. With the scan tool, erase DTCs.
    4. Turn the ignition off for 75 seconds.
    5. Start the vehicle. It may be necessary to drive vehicle to reset DTC.
    6. With the scan tool, read DTCs.

      Did the DTC reset?

      Yes 

      • Go To  8

      No 

  8. POWERTRAIN CONTROL MODULE 
    1. Disconnect all PCM harness connectors.
    2. Disconnect all related in-line harness connections (if equipped).
    3. Disconnect the related component harness connectors.
    4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Perform a terminal drag test on each connector terminal to verify proper terminal tension.

      Repair any conditions that are found.

    5. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    7. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. With the scan tool, erase DTCs.
    9. Using the recorded Freeze Frame and Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
    10. With the scan tool, read PCM DTCs.

      Did the DTC return?

      Yes 

      No 

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