J1962 Pin 4 vs Pin 5: Why Bonding Them Inside Your Diagnostic Tool Creates Phantom Sensor Faults
This is the kind of fault that doesn’t show up on a bench test at twenty-five degrees Celsius. It shows up three weeks later, on a customer’s truck, at 6:40 in the morning, after a cold start, when the engine light comes on for a cam sensor that the dealer’s own tool never sees. If […]