1. Block the vehicle's wheels.
2. Set the parking brake.
3. Place the transmission selector lever in P (Park) or N (Neutral).
4. Connect a vacuum gauge to the vacuum pump inlet hose.
5. Let the engine idle.

Does the vacuum reach the minimum acceptable value within 30 seconds? (Refer to Mechanical Specifications.)

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System OK

Go to Step 2

1. Check the gauges and the connections for leaks.
2. Check the belt tension and the pulley-to-shaft fit on belt-driven models.
3. Check the idle rpm.

Is the vacuum OK after making these checks and making any necessary repairs or adjustments?

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Go to Step 4

Go to Step 3

Replace the vacuum pump.

Is the repair complete?

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System OK

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1. Connect the vacuum gauge to the vacuum pump inlet hose using a "T" fitting.
2. Connect the accessories hoses to the "T" fitting.
3. Idle the engine for one minute.

Is the minimum vacuum within 10 kPa (3"-Hg) of the measurement taken previously?

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System OK

Go to Step 5

Check all the attaching hoses and the vacuum accessories for leaks.

Is the repair complete?

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System OK

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