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 3.
  No
  - Perform the INTERMITTENT CONDITION - 6.7L diagnostic procedure. Refer to INTERMITTENT CONDITION - 6.7L .
CHECK THE DIESEL EXHAUST FLUID ENGINE COOLANT CONTROL VALVE
1. Turn ignition off.
2. Disconnect the DEF Engine Coolant Control Valve harness connector.
3. Connect a jumper 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.
  NOTE:
  Be careful not to spread the terminals in the connector.
4. Turn the ignition on.
5. With a scan tool, View DTCs.
  Does the scan tool display DTC P202B as active and P202A as stored with the jumper in place?
  
  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
  - Go To 3.
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 Dosing Control Unit C1 harness connector.
3. Measure the resistance of the (K473) DEF Engine Coolant Control Valve Signal circuit between the DEF Dosing Control Unit C1 harness connector and the DEF Engine Coolant Control Valve harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 4.
  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 Dosing Control Unit C1 harness connector and the DEF Engine Coolant Control Valve harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - 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 .
  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 .