No. 2 All On-Board Diagnostic Functions Inoperative: Notes

When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, make sure connectors, terminals and wiring harnesses are connected correctly and undamaged.

Fig 1: Possible Cause Chart - No. 2 All On-Board Diagnostic Functions Inoperative
Courtesy of MAZDA MOTORS CORP.