LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Dodge and Ram >> 2007 >> Nitro R/T, AWD >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Ignition Control (Service Information) >> Ignition Control - Service Information >> Plug-Glow 2.8L Diesel >> Diagnosis And Testing >> Glow Plug System
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Glow Plug System

CAUTION: DO NOT attempt to start the engine until the glow plug system tests correctly.
  1. Measure the electrical resistance of each glow plug while it is still installed in the cylinder head. Resistance should be less than 0.8 ohm between the electrical connector point on the glow plug and the cylinder head. The ground contact on the DVOM must be as close as possible to the point where the glow plug contacts the cylinder head to avoid erratic resistance measurements.
  2. If the resistance is out of tolerance, remove the glow plug from the cylinder head and check the resistance again.
  3. Use the actuator test function of the scan tool to test the glow plug module and glow plug lamp. The glow plug module's on-board diagnostic tests will automatically check the electrical condition of the entire glow plug system.
  4. After the scan tool glow plug actuator test function is complete, if MIL is OFF and no glow plug DTCs are present, testing is complete and the engine can be started.
  5. If MIL is still ON, check the harness connectors of glow plugs, repair any loose or damaged connections, and run the glow plug actuator test again.
  6. If MIL is still ON and glow plug DTCs are present, refer to 9 - Engine Electrical Diagnostics - Diesel, and follow the diagnostic test(s) related to the active or stored DTCs.
scientia non olet · About LEMON Manuals