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, engine not running.
2. With the scan tool, View DTCs.
  Is the DTC active?
  
  Yes
  - Go To 3.
  No
  - Perform the INTERMITTENT CONDITION - 6.7L. Refer to INTERMITTENT CONDITION - 6.7L .
DEF INJECTOR
1. With the scan tool, Erase DTCs.
2. Turn ignition off.
3. Disconnect the DEF Injector harness connector.
4. Turn the ignition on.
5. With the scan tool, navigate to Systems Tests actuate of the Diesel Exhaust Fluid Doser Pump Override Test.
6. With the scan tool, View DTCs.
  Does DTC P2048 become active and P2049 stored with the DEF Injector harness connector disconnected?
  
  Yes
  - Replace the DEF Injector in accordance with the Service Information. Refer to INJECTOR, Diesel Exhaust Fluid , Removal .
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 3.
CHECK FOR THE (K428) DEF INJECTOR SIGNAL CIRCUIT SHORTED TO ANOTHER CIRCUIT

Fig 1: Checking DEF Injector 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 the (K428) DEF Injector Signal circuit and all other circuits at the DEF Dosing Control Unit C1 harness connector.
  Is the resistance above 10k Ohms between the (K428) DEF Injector Signal circuit and all other circuits?
  
  Yes
  - Go To 4.
  No
  - Repair the short between the (K428) DEF Injector Signal circuit and the circuit that measured below 10k Ohms.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK FOR THE (K426) DEF INJECTOR RETURN CIRCUIT SHORTED TO ANOTHER CIRCUIT

Fig 2: Checking DEF Injector Return Circuit For Short To Another Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (K426) DEF Injector Return circuit and all other circuits at the DEF Dosing Control Unit C1 harness connector.
  Is the resistance above 10k Ohms between the (K426) DEF Injector Return circuit and all other circuits?
  
  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 short between the (K428) DEF Injector Return circuit and the circuit that measured below 10k Ohms.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .