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Ensure vehicle meets the following conditions before performing procedure:

Barometric pressure is more than 10.4 psi (72 kPa).
Engine coolant temperature is 41-248°F (5-120°C).
Intake air temperature is 21-392°F (-6 to 200°C).
Battery voltage is 9-18 volts.
Fuel level is 1/4-3/4 full.