Chevrolet 2003 Avalanche Owner's Manual page 452

2. Firmly apply both the parking brake and the regular
brake. See Parking Brake on page 2-38 if
necessary.
Do not use the accelerator pedal, and be ready to
turn
off
the engine immediately if it starts.
3. Try to start the engine in each gear. The starter
should work only in PARK (P) or NEUTRAL (N).
If the starter works in any other position, your
vehicle needs service.
Automatic Transmission Shift Lock
Control Sy-'-71 Chef-
When you are doing this check, the vehicle
could move suddenly. If it does, you or others
could be injured. Follow the steps below.
1. Before you start, be sure you have enough room
around the vehicle. It should be parked on a level
surface.
2. Firmly apply the parking brake. See Parking Brake
on page
2-38
if necessary.
Be ready to apply the regular brake immediately if
the vehicle begins to move.
position, but don't start the engine. Without applying
the regular brake, try to move the shift lever out
of PARK (P) with normal effort. If the shift lever
moves out of PARK (P), your vehicle needs service.
3. With the engine off, turn the key to the RUN
Ignition Transmission Lock Check
While parked, and with the parking brake set, try to turn
the ignition key to LOCK in each shift lever position.
0
The key should turn to LOCK only when the
shift lever is in PARK (P).
0
The key should come out only in LOCK.
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