Warning
1. Disconnect the negative battery cable.
2. Remove the under cover.
3. Disconnect the cord assembly connector.

4. Remove the oil pressure switch.
5. Install the oil pressure switch.
Tightening torque 17.1-22.1N·m {1.75-2.25kgf·m, 13-16ft·lbf}
6. Connect the oil pressure switch connector.
7. Install the under cover.
8. Connect the negative battery cable.
Oil pressure switch inspection
Input/turbine speed sensor inspectionMazda 6 Service Manual: No.8 brake system warning light stays on more than 4 seconds with ignition
switch on
Diagnostic procedure
When performing an asterisked (*) troubleshooting inspection, shake the
wiring harness and connectors while doing the inspection to discover whether
poor contact points are the cause of any intermittent malfunction. If there
is a problem, check to make sure co ...
Mazda 6 Service Manual: Variable tumble control system (vtcs) shutter valve actuator inspection
1. Remove the air hose. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION.)
2. Disconnect the vacuum hose from the VTCS shutter valve actuator.
3. Connect a vacuum pump to the VTCS shutter valve actuator.
4. Apply vacuum and verify that the rod moves.
If the rod dose not move, replace the intake ...