Mazda 6 Service Manual: No.26 exhaust sulphur smell

No.25 a/c is not cut off under wide open throttle conditions

No.27 constant voltage

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Mazda 6 Service Manual: Instrument cluster inspection
Speedometer Using the input/output check mode Inspect the speedometer by setting it in the input/output check mode DTC 12. Using a speedometer tester 1. Adjust the tire air pressure to the specification. 2. Using a speedometer tester, verify that the speedometer indication is within the allow ...

Mazda 6 Service Manual: Expansion valve removal/installation
1. Disconnect the negative battery cable. 2. Discharge the refrigerant from the system. (See RECOVERY.) (See CHARGING.) Caution If moisture or foreign material enters the refrigeration cycle, cooling ability will be lowered and abnormal noise will occur. Always immediately plug open fitt ...