Diagnostic Test

WARNING: This page is about a different car, the 2016 RAM 3500 HD and 2016 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
NOTE:
If DTC U02A2 is present, perform the Diagnostics for that DTC before continuing with this one.
1. Ignition on, engine not running.
2. With the scan tool, read DTCs.
  Is this DTC active?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION - DIESEL diagnostic procedure. Refer to INTERMITTENT CONDITION - 6.7L .
CHECK SYSTEM VOLTAGE
1. Check the Batteries and charging system for proper system voltage and operation.
  Is the system voltage normal?
  
  Yes
  - Go To 3
  No
  - Diagnose and repair the Batteries and charging system before continuing.
  - Perform the PCM VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE DEF QUALITY SENSOR POWER AND GROUND CIRCUITS
1. Turn the ignition on, engine not running.
2. Disconnect the DEF Quality Sensor harness connector.
3. Measure the voltage across the (F205) SCR Relay circuit and the (Z914) Ground circuit at the DEF Quality Sensor harness connector.
  Does the voltage read within 1.0 volt of Battery voltage?
  
  Yes
  - Replace the DEF Quality Sensor in accordance with the Service Information.
  - Perform the PCM VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 4
CHECK FOR VOLTAGE AT THE (F205) SCR RELAY CIRCUIT
1. Leave the ignition on, engine not running.
2. Measure for voltage between ground and the (F205) SCR Relay circuit at the DEF Quality Sensor harness connector.
  Does the voltage read within 1.0 volt of Battery voltage?
  
  Yes
  - Repair the (Z914) Ground circuit for an open/high resistance.
  - Perform the PCM VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Repair the (F205) SCR Relay circuit for an open or high resistance.
  - Perform the PCM VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .