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DTC U0073, U1900 & U2516: Can System Communication Error & Can System Wiring Harness Open Or Short Circuit: Notes

WARNING: This page is about a different car, the 2004 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Possible Causes - DTC U0073, U1900 & U2516
G01344146Courtesy of MAZDA MOTORS CORP.
Fig 2: CAN System Layout - DTC U0073, U1900 & U2516
G01344147Courtesy of MAZDA MOTORS CORP.