Diagnostic Test

WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

VERIFY ALL DTC OR PRODUCT IMPROVEMENTS
1. Check for any TSBs related to customer's complaint or DTCs present.
2. Follow appropriate guidelines in DTC troubleshooting tree or instructions in TSB.
  Is vehicle repaired?
  
  Yes
  - Repair complete.
  - Perform the PCM VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 2
CHECK FOR A NO CRANK CONDITION
Does the engine crank?

Yes
- Go To 3
No
- Go To 4
CHECK FUSE 78 (10A) FOR AN OPEN
1. Check Fuse 78 (10A) in the Power Distribution Center (PDC) for an open.
  Is the fuse open?
  
  Yes
  - Replace Fuse 78 (10A) and determine the source of the short circuit.
  - Perform the PCM VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Refer to NO CRANK (BCM EQUIPPED) .
CHECK PCM POWER AND GROUND CIRCUITS
NOTE:
If there are any CAN Bus DTCs in any modules, STOP this Diagnostic and perform the Diagnostics for those DTCs before continuing with this one.
1. Using the scan tool, attempt to communicate with the Powertrain Control Module (PCM).
  Was the scan tool able to communicate with the PCM?
  
  Yes
  - Go To 5
  No
  - Refer to CHECKING THE PCM POWER AND GROUNDS .
CHECK STARTING ACCESSORIES FOR PROPER OPERATION
1. Inspect the Ignition switch (check for proper output voltage and/or open circuit).
2. Inspect the Starter operation.
3. Inspect the Grid Heater operation.
4. Inspect the Fuel Heater operation.
  Were any problems found?
  
  Yes
  - Perform the appropriate repairs.
  - Perform the PCM VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 6
CHECK THE ENGINE TIMING/MECHANICAL CONDITION
1. Inspect the (Crankshaft) speed indicator ring for damaged/missing teeth.
2. Inspect for dirty or damaged pins at Crankshaft position sensor (CKP) or Camshaft position sensor (CMP).
3. Verify proper overhead valve adjustments.
4. Perform a compression test.
  Were any problems found?
  
  Yes
  - Perform the appropriate repairs.
  - Perform the PCM VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 7
CHECK THE FUEL PRESSURE ACTUAL COMPARED TO THE SETPOINT
1. Using a scan tool, compare the fuel pressure actual reading to the set point while cranking the engine.
  Does the actual fuel pressure fluctuate more then +/- 500 psi of set point?
  
  Yes
  - Go To 8
  No
  - Perform the CHECKING THE FUEL DELIVERY SYSTEM test procedure. Refer to CHECKING THE FUEL DELIVERY SYSTEM .
CHECK THE EGR AIRFLOW CONTROL VALVE FOR PROPER OPERATION
1. Turn the ignition off.
2. Remove the inlet hose to the EGR Airflow Control Valve.
3. Use a mirror to inspect the valve while an assistant cycles the ignition on and off several times.
  Does the EGR Airflow Control Valve cycle open and close without sticking when the ignition is cycled on and off?
  
  Yes
  - Go To 9
  No
  - Check the electrical circuits for the EGR Airflow Control Valve. If the wiring is good, replace the EGR Airflow Control Valve.
  - Perform the PCM VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
INSPECT THE GRID HEATER FOR SOOT OR OTHER FOREIGN MATERIAL
1. Turn the ignition off.
2. Remove the Intake Air Horn to inspect the Grid Heater.
  Is the Grid Heater fouled with soot?
  
  Yes
  - Clean the Grid Heater as necessary using EGR Cleaner. Determine the cause of the excess soot buildup.
  - Perform the PCM VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 10
CHECK FOR A PLUGGED EXHAUST SYSTEM
1. Separate the exhaust system and attempt to start the engine.
  Does the engine start?
  
  Yes
  - Perform the AFTERTREATMENT INSPECTION GUIDELINE procedure. Refer to AFTERTREATMENT INSPECTION GUIDELINE .
    NOTE:
    It is imperative to determine root cause of excessive soot build up.
  - After repair perform the DIESEL AFTERTREATMENT VALIDATION TEST. Refer to DIESEL AFTERTREATMENT VALIDATION- 6.7L .
  No
  - Go To 11
CHECK THE FUEL QUALITY OR THE PRESENCE OF CONTAMINATION
1. Check the quality of the fuel using the DIESEL FUEL CONTAMINATION AND CLEANING PROCEDURE. Refer to DIESEL FUEL CONTAMINATION TESTING PROCEDURE .
  Was any contamination detected?
  
  Yes
  - Perform the appropriate repair according to the testing and cleaning procedure.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 12
CHECK THE INTAKE SYSTEM FOR PROPER OPERATION, RESTRICTIONS OR LEAKS
1. Check for inlet restriction, inspect the Air Filter for excessive dirt/debris. Verify air intake lines are not kinked or restricted.
2. Inspect Turbocharger for wheel clearance.
3. Check for air system leaks. Perform INTAKE AIR SYSTEM PRESSURE TEST procedure. Refer to INTAKE AIR SYSTEM PRESSURE TEST .
  Were any issues found?
  
  Yes
  - Perform the appropriate repairs.
  - Perform the PCM VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Check for an engine mechanical problem such as low compression due to damaged pistons, cylinder walls, or valve train.
  - Perform the PCM VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .