Code : U1900
Marque : MERCURY
Description : U1900 MERCURY CAN Communication Bus Fault
Possible causes :
– Faulty / intermittent ignition switch connections
– CAN Bus wiring intermittently open/shorted to power or ground
– Faulty / intermittent connection at PCM
– Faulty electrical connections at ABS Control Module
– Faulty electrical connections at the instrument
Solutions :
– Carry out a Reset via CarDiag
– Choose a better quality fuel
– Check that the tank cap is securely closed
– Check the oil level and add more if it is lower than MAX
– Restart an Automatic diagnostic via CarDiag
– If the fault persists, you can check the “Possible causes” listed above : visually inspect (by yourself (tutorials to come) or by a professional) the wiring harness and the associated connectors, check for damaged components, and look for broken, bent, pushed, or corroded connector pins.



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