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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 972 (6.7L Diesel - DTCS P063D To P205D - 2500 Hd & 3500 Hd) >> Diagnosis And Testing >> P203C-(Diesel Exhaust Fluid) REDUCTANT Level 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:

    If the P204A DTC is also active, diagnose and repair that DTC before continuing with this test procedure.

    1. Turn the ignition on for one minute, engine not running.
    2. With the scan tool check for active DTCs.

      Is the DTC active?

      Yes 

      • Go To  2

      No 

  2. CHECK THE DEF TANK LEVEL SENSOR 5-VOLT SUPPLY CIRCUIT 
    1. Turn ignition off.
    2. Disconnect the DEF Pump/Level assembly harness connector.
    3. Turn ignition on.
    4. Measure the voltage at the DEF Tank Level Sensor 5-Volt Supply circuit at the DEF Pump/Level assembly harness connector.

      Is the voltage reading between 4.8 and 5.2 volts?

      Yes 

      • Go To  3

      No 

      • Repair the DEF Tank Level Sensor 5-Volt Supply circuit for an open circuit or short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  3. CHECK THE DEF TANK LEVEL SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    1. Turn ignition off.
    2. Disconnect the DEF Dosing Control Unit C2 harness connector.
    3. Measure the resistance between ground and the DEF Tank Level Sensor Signal circuit at the DEF Pump/Level assembly harness connector.

      Is the resistance above 10k Ohms?

      Yes 

      • Go To  4

      No 

  4. CHECK FOR THE DEF TANK LEVEL SENSOR SIGNAL CIRCUIT SHORTED TO THE DEF TANK LEVEL SENSOR RETURN CIRCUIT 
    1. Measure the resistance between the DEF Tank Level Sensor Signal circuit and the DEF Tank Level Sensor Return circuit at the DEF Pump/Level assembly harness connector.

      Is the resistance above 10k Ohms?

      Yes 

      • Go To  5

      No 

      • Repair the short between the DEF Tank Level Sensor Signal circuit and the DEF Tank Level Sensor Return circuit.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  5. CHECK THE DEF TANK LEVEL SENSOR SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the DEF Tank Level Sensor Signal circuit between the DEF Pump/Level assembly harness connector and the DEF Dosing Control Unit C2 harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  6

      No 

      • Repair the DEF Tank Level Sensor Signal circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  6. CHECK THE DEF PUMP/LEVEL ASSEMBLY 
    1. Connect a jumper between the DEF Tank Level Sensor 5-Volt Supply circuit and the DEF Tank Level Sensor Signal circuit at the DEF Pump/Level assembly harness connector.
    2. Reconnect the DEF Dosing Control Unit C2 harness connector.
    3. Turn the ignition on, engine not running.
    4. With the scan tool check DTCs.
    5. Monitor the scan tool for one minute.

      Did DTC P203D set as active or pending with the jumper in place?

      Yes 

      • Replace the DEF Pump/Level assembly in accordance with the service information.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .

      No 

      • Replace the DEF Dosing Control Unit in accordance with the service information.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
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