GMC 1994 Yukon Owner's Manual page 357

1. Before you start, be sure you have enough room around
the vehicle.
2. Firmly apply both the manual parking brake and the regular brake. See
"Brakes" and "Parking Brake" in the Index. Do not use the accelerator
pedal.
3. Be ready to turn off the engine immediately if it starts.
4. On automatic transmission vehicles, try to start the engine in each gear.
The starter should work only in
" P 7
(Park) or
"N"
(Neutral).
On manual transmission vehicles, put the shift lever in "N" (Neutral), push
the clutch down halfway, and try to start the engine. The starter should work
only when the clutch is pushed down all the way to the floor.
Steering column lock operation
-
While parked, try to turn the key to
LOCK in each gear shift position.
With an automatic transmission, the key should turn to LOCK only when
the gear shift is in
"P"
(Park).
On vehicles with a key release lever, try to turn the key to LOCK without
pressing the lever. The key should turn to LOCK only with the key lever
depressed.
On all vehicles, the key should come out only in LOCK.
Parking brake and transmission
" P '
(PARK) mechanism operation
-
Park on a fairly steep hill, with the vehicle facing downhill. Keeping your
foot on the regular brake, set the manual parking brake.
To check the parking brake: With the engine running and the
transmission in "N" (Neutral), slowly remove foot pressure from the
regular brake pedal.
Do
this until the vehicle
is
held by the parking
brake only.
To check the "P7' (Park) mechanism's holding ability: Apply the regular
brake and shift to
" P '
(Park). Release the manual parking brake, then
slowly release the regular brake.
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