1. Remove the vacuum hose..
2. Verify that air can be blown from the power brake unit side of the vacuum hose towards the vacuum pump side, and that air cannot be blown in the opposite direction.

If there is any malfunction of the inner check valve, replace it together with the vacuum hose as a single unit.
Vacuum Hose Removal/Installation
Vacuum Pump InspectionSide Turn Light Inspection
1. Disconnect the negative battery cable..
2. Remove the following parts:
a. Outer mirror glass.
b. Upper outer mirror garnish.
c. Side turn light.
3. Apply battery voltage to side turn light terminal A, and connect terminal
B to ground.
4. Verify that the LED illuminates.
...
Assist Handle Removal/Installation
Removal
1. Insert a tape-wrapped flathead screwdriver into the service hole and remove
the assist handle covers.
2. Remove the assist handle in the direction of the arrow (1) and (2), while
detach clips.
NOTE:
Remove the assist handle by shaking it up and down.
Install ...
Air Fuel Ratio (A/F) Sensor Inspection
A/F Sensor Inspection
1. Connect the M-MDS to the DLC?2.
2. Switch the ignition ON (engine on).
3. Warm up the engine to normal operating temperature.
4. Access the following PIDs using the M-MDS..
VSS (Vehicle speed)
RPM (Engine speed)
O2S11 (A/F sensor output current ...