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Home >> Chrysler >> 2011 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 973 (6.7L Diesel - DTCS P205E To P245D - 2500 Hd & 3500 Hd) >> Diagnosis And Testing >> P20B8-(Diesel Exhaust Fluid) REDUCTANT Pump Heater Control Circuit High >> 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 DTC P21CB or P21CC are also active, diagnose and repair that DTC before continuing with this test procedure.

    1. Turn the ignition on, engine not running.
    2. With the scan tool, actuate the DEF Line Heater or Tank Heater.
    3. With the scan tool, navigate to Actuator Tests and actuate the DEF Line Heater or Tank Heater Override Test.
    4. With the scan tool, View DTCs.

      Is the DTC Active?

      Yes 

      • Go To  2

      No 

  2. CHECK THE (F203) SCR MODULE HEATER SUPPLY CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT 
    1. Turn the ignition off for 90 seconds.
    2. Disconnect the PDC C5 harness connector.
    3. Disconnect the DEF Dosing Control Unit C1 harness connector.
    4. Disconnect the PCM C2 harness connector.
    5. Measure the resistance between the (F203) SCR Module Heater Supply circuit and all other circuits at the DEF Dosing Control Unit C1 harness connector.

      Is the resistance above 10k Ohms between the (F203) SCR Module Heater Supply circuit and all other circuits?

      Yes 

      • Go To  3

      No 

      • Repair the short between the (F203) SCR Module Heater Supply circuit and the circuit that measured below 10k Ohms.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  3. CHECK THE DEF DOSING CONTROL UNIT 
    1. Replace the DEF Dosing Control Unit in accordance with the service information.
    2. Turn the ignition on, engine not running.
    3. With the scan tool, erase DTCs.
    4. With the scan tool, navigate to Actuator Tests and actuate the DEF Line Heater or Tank Heater Override Test.
    5. With the scan tool, View DTCs.

      Did the DTC return?

      Yes 

      • Replace the Powertrain Control Module in accordance with the service information.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .

      No 

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