The Rustronic CT92468A Analog Output Module (AOM) is a four‑channel 4‑20 mA current‑loop driver used in engine control systems such as the SGT and LM series. Common failure points for this class of modules include degraded power‑rail decoupling, burnt or cracked trace paths on the PCB, and failed output transistors due to overcurrent or overheating; these symptoms often manifest as erratic loop currents or complete loss of one or more channels. First‑check diagnostics should begin with verifying that the module’s 24 V DC supply is within spec and free of ripple, then measuring each channel’s open‑loop current to confirm proper biasing, followed by a visual inspection for burn marks or cracked solder joints on the output driver area. If anomalies persist, proceed to isolate the module from the control system and test with a known good loop load to rule out external actuator faults.[oss-gpt-20b]