A 2004 Freightliner Columbia with a 14L Detroit Diesel engine recently developed issues after running smoothly for the initial two weeks. The first problem, a PID 354 code (Relative Humidity Sensor), was resolved by replacing the visibly damaged sensor. However, a new problem arose, indicated by a SID 060 code, pointing to a potential issue with the VPOD (Variable Pulse Output Driver).
The SID 060 code signifies a PWM (Pulse Width Modulation) #4 open circuit, often related to the VPOD harness or the VPOD itself. Before the SID 060 code appeared, the truck exhibited fluctuating turbo noise at idle, with the sound cutting in and out and boost seemingly changing without throttle input. Initially, performance wasn’t affected. Subsequently, a significant power decrease occurred, accompanied by a near absence of turbo boost noise, even at idle.
The Detroit Diesel diagnostic manual suggests an open circuit as the cause of the SID 060 code. Initial troubleshooting steps include a thorough visual inspection of the VPOD and its harness for loose connections, damaged wires, or corrosion. Checking the VPOD connector for proper seating and security is also crucial.
While a laptop with Detroit Diesel diagnostic software offers comprehensive troubleshooting capabilities, some checks can be performed without specialized equipment. A multimeter can be used to test for continuity in the wiring between the VPOD and the injectors. This will help determine if there is a break in the circuit. Visually inspecting the wiring harness for any signs of chafing or damage where it might rub against other components is also recommended. Furthermore, examining the engine’s ground connections for cleanliness and tightness is essential for proper electrical function. Although replacing the VPOD harness might seem like a direct solution, it’s advisable to exhaust all possible causes before resorting to component replacement. A faulty injector or a problem within the ECM (Engine Control Module) could also potentially trigger a SID 060 code.
