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.

ACTIVE DTC
1. Turn the ignition on, engine not running.
2. With the scan tool, navigate to Systems Tests and actuate the Prime Test.
3. With the scan tool, View DTCs.
  Is the DTC Active?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION - 6.7L. Refer to INTERMITTENT CONDITION - 6.7L .
CHECK THE DEF SUPPLY PUMP ASSEMBLY
1. Turn the ignition off.
2. Disconnect the DEF Supply Pump Assembly harness connector.
3. Connect a jumper between the DEF Supply Pump Motor Phase A Supply circuit and the DEF Supply Pump Motor Phase B circuit at the DEF Supply Pump Assembly harness connector.
  NOTE:
  Be careful not to spread the terminals.
4. Turn the ignition on.
5. With the scan tool, navigate to Systems Tests and actuate the Diesel Exhaust Fluid Prime Test.
6. With a scan tool, View DTCs.
7. Move the jumper from DEF Supply Pump Motor Phase B circuit to Phase C (leave other side of jumper connected to Phase A).
  NOTE:
  Be careful not to spread the terminals.
8. Turn the ignition on.
9. With the scan tool, navigate to Systems Tests and actuate the Diesel Exhaust Fluid Prime Test.
10. With a scan tool, View DTCs.
  Did DTC P208D become active and DTC P208A change to stored with the jumper in place (during both Phase circuit tests)?
  
  Yes
  - Replace the DEF Supply Pump Assembly in accordance with the service information. Refer to ASSEMBLY, DIESEL EXHAUST FLUID PUMP, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 3
CHECK THE DEF SUPPLY PUMP MOTOR A SUPPLY CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Turn the ignition off.
2. Disconnect the DEF Dosing Control Unit C2 harness connector.
3. Measure the resistance of the DEF Supply Pump Motor A Supply circuit between the DEF Supply Pump Assembly harness connector and the DEF Dosing Control Unit C2 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the DEF Supply Pump Motor A Supply circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE DEF SUPPLY PUMP MOTOR B SUPPLY CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the DEF Supply Pump Motor B Supply circuit between the DEF Supply Pump Assembly harness connector and the DEF Dosing Control Unit C2 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the DEF Supply Pump Motor B Supply circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE DEF SUPPLY PUMP MOTOR C SUPPLY CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the DEF Supply Pump Motor C Supply circuit between the DEF Supply Pump Assembly harness connector and the DEF Dosing Control Unit C2 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - 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 .
  No
  - Repair the DEF Supply Pump Motor C Supply circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .