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. Refer to INTERMITTENT CONDITION - 6.7L .
DIESEL EXHAUST FLUID ENGINE COOLANT CONTROL VALVE
1. Turn ignition off.
2. Disconnect the DEF Engine Coolant Control Valve harness connector.
3. Turn ignition on.
4. With a scan tool, View DTCs.
  Does the scan tool display DTC P202A as active and P202B 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
  - Go To 3.
CHECK THE (K473) DIESEL EXHAUST FLUID ENGINE COOLANT CONTROL VALVE SIGNAL CIRCUIT FOR A SHORT TO GROUND

Fig 1: Checking Diesel Exhaust Fluid Engine Coolant Control Valve Signal Circuit For A Short
Courtesy of CHRYSLER LLC
1. Turn ignition off.
2. Disconnect the DEF Dosing Control Unit C1 harness connector.
3. Measure the resistance between ground and the (K473) DEF Engine Coolant Control Valve Signal circuit at the DEF Engine Coolant Control Valve harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 4.
  No
  - Repair the (K473) DEF Engine Coolant Control Valve Signal circuit for a short to ground.
  - 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 A SHORT TO GROUND

Fig 2: Checking Diesel Exhaust Fluid Engine Coolant Control Valve Return Circuit For A Short
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground 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
  - 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 a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .