Turbocharger Boost Pressure

Engine must be cool. Disconnect hose "A" from solenoid valve and connect pressure gauge. See Fig 1 . Warm engine to normal operating temperature. Increase engine speed to 4000 RPM and verify boost pressure is more than zero psi. If boost pressure is not to specification, proceed to following tests as necessary.

Fig 1: Testing Boost Pressure

Courtesy of MAZDA MOTORS CORP.