How are Glow Plug Control Module issues diagnosed?
When diagnosing the glow plug control module, the technician will simply compare actual conditions to electronic conditions. In other words, If the technician notes that the glow plugs are inactive, yet the control module reports they are ready to start, a discrepancy is noted. Discrepancies like this are commonly used as clues which map to the issue. If the technician finds that the issue originates with the glow plug control module, whether by physical or scan testing, the module will be verified defective and replaced.
How are Glow Plug Control Modules replaced?
Like any other control module, the location of the glow plug control module will be identified, and the technician will then begin removing all obstructing components needed to access and remove the control module. Once accessed and removed, the connectors are cleaned and inspected, and the new module will be installed. After all components are reassembled on the vehicle, the technician will program the control module, if needed, and test the operation of the system to ensure the customer complaint has been corrected.
RepairPal Recommendations for Glow Plug Control Module issues
When dealing with electronic systems, especially if the issue pertains to the control module, we recommend thorough diagnostics before replacing parts. In effort to correct a no-start condition for a diesel engine, it would be very easy to spend hundreds of dollars replacing glow plugs, the glow plug harness, grounding straps, relays, and batteries before realizing the issue is more advanced. In the case of a failure relating to the glow plug control module, starting, or rough running on start-up, diagnostics is a must.
What to look out for when dealing with Glow Plug Control Module issues
Diesel engines are a very industrial style of engine, and even modernized versions of diesel engines are more dangerous to service than gasoline engines. The parts and systems are hardly comparable, and there is great danger of heat exposure and electric shock when dealing with the glow plugs. Great care should be taken to understand the engine control systems of a diesel engine before attempting to service them.
Can I replace the Glow Plug Control Module myself?
Except for the very advanced DIY mechanic with a strong understanding of computerized circuit diagnostics and testing, this repair should be left to a professional. Again, the glow plug circuit and glow plugs can cause serious harm if interacted with improperly, and diagnostics of electronic systems are difficult for the untrained person to perform correctly. Unless all safety and diagnostic protocol is understood and followed properly, this should be left to a professional.
