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.

ACTIVE DTC
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
  - Perform the INTERMITTENT CONDITION - 6.7L diagnostic procedure. Refer to INTERMITTENT CONDITION - 6.7L .
CHECK THE (K473) DIESEL EXHAUST FLUID ENGINE COOLANT CONTROL VALVE SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE

Fig 1: Checking Diesel Exhaust Fluid Engine Coolant Control Valve Signal Circuit For An Open Or High Resistance
Courtesy of CHRYSLER LLC
1. Turn ignition off.
2. Disconnect the DEF Engine Coolant Control Valve harness connector.
3. Disconnect the DEF Dosing Control Unit C1 harness connector.
4. Measure the resistance of the (K473) DEF Engine Coolant Control Valve Signal circuit between the DEF Tank Level/Temperature Sensor harness connector and the Diesel Exhaust Fluid Control Unit C1 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 3.
  No
  - Repair the (K473) DEF Engine Coolant Control Valve Signal circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE (K474) DIESEL EXHAUST FLUID ENGINE COOLANT CONTROL VALVE RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE

Fig 2: Checking Diesel Exhaust Fluid Engine Coolant Control Valve Return Circuit For An Open/High Resistance
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (K474) DEF Engine Coolant Control Valve Return circuit between the DEF Tank Level/Temperature Sensor harness connector and the DEF Dosing Control Unit C1 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 4.
  No
  - Repair the (K474) DEF Engine Coolant Control Valve Return circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK FOR THE (K473) DIESEL EXHAUST FLUID ENGINE COOLANT CONTROL VALVE SIGNAL CIRCUIT SHORTED TO THE (K474) DIESEL EXHAUST FLUID ENGINE COOLANT CONTROL VALVE RETURN CIRCUIT
1. Measure the resistance between the (K473) DEF Engine Coolant Control Valve Signal circuit and the (K474) DEF Engine Coolant Control Valve Return circuit at the DEF Engine Coolant Control Valve harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 5.
  No
  - Repair the short between the (K473) DEF Engine Coolant Control Valve Signal circuit and the (K474) DEF Engine Coolant Control Valve Return circuit.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE (K473) DIESEL EXHAUST FLUID ENGINE COOLANT CONTROL VALVE SIGNAL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT
1. Measure the resistance between the (K473) DEF Engine Coolant Control Valve Signal circuit and all other circuits at the DEF Dosing Control Unit C1 harness connector.
  Is the resistance above 10k Ohms between the (K473) DEF Engine Coolant Control Valve Signal circuit and all other circuits?
  
  Yes
  - Go To 6.
  No
  - Repair the (K473) DEF Engine Coolant Control Valve Signal circuit for a short to the circuit that measured below 10k Ohms.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
DIESEL EXHAUST FLUID ENGINE COOLANT CONTROL VALVE
1. Turn ignition off.
2. Reconnect the DEF Dosing Control Unit C1 harness connector.
3. Turn ignition on.
4. With a scan tool, View DTCs.
  Does the scan tool display DTC P202A as active and P202C as stored with the DEF Dosing Control Unit C1 harness connector disconnected?
  
  Yes
  - Replace the DEF Engine Coolant Control Valve in accordance with the service information. Refer to VALVE, Diesel Exhaust Fluid Engine Coolant Control , Removal .
  - 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. Refer to UNIT, Diesel Exhaust Fluid Dosing Control , Removal .
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .