All-wheel drive system

Warning:

• Driving in four-wheel drive on flat, dry, paved roads for extended periods of time can shorten the life of your vehicle's transmission.
• Continued driving with automatic all-wheel drive or all-wheel drive with a high-range transfer case engaged may result in reduced service life of the transfer case and/or all-wheel drive system.
• Use all-wheel drive only when extra traction is needed, such as on wet or icy roads.
• Under normal driving conditions, set the transfer case switch to rear-wheel drive only.

Automatic transfer case

1. The automatic transfer case switch is located on the control panel (see illustration). You can choose one of four operating modes for the transfer case.

Rear wheel drive A

2. The switch should be in this position under normal city and highway driving conditions. In this mode, your vehicle's front wheels are disconnected from the engine. This mode provides the best fuel efficiency.

Automatic inclusion of all-wheel drive B

3. This is the best mode for driving under changing road conditions. The front drive axle is connected, but all torque is sent to the rear wheels. Only when the system detects slipping of the rear wheels does all-wheel drive automatically engage. When driving in this mode, fuel efficiency is slightly reduced compared to driving in single-wheel drive mode.


All-wheel drive with high-speed transfer case C

4. In this mode, the front drive axle is constantly engaged. Use 4HI mode in conditions where extra traction is required, such as on wet or icy roads, or when driving off-road.

All-wheel drive with low-range transfer case D

5. In this mode, the front drive axle is also constantly connected to create additional traction force. This mode should only be used in severe off-road conditions, such as deep sand, mud, or steep inclines and descents.

Neutral E

6. Use this transfer case mode only when towing your vehicle.

Warning: If the transfer case is in neutral, your vehicle may roll even if the automatic transmission selector is in the P position (Parking). You or others may be seriously injured. Make sure the parking brake is engaged before shifting the transfer case into neutral.

7. When the ignition is turned on, all the indicators located around the transfer case operating mode switch will light up for a short time, and then the indicator corresponding to the mode enabled in the transfer case will remain on. If these indicators do not light up when the ignition is turned on, you must contact a service station. Turn the switch to the position corresponding to the desired operating mode of the transfer case.

8. During the switching process, the indicator will flash, and when the switching is completed, it will light up continuously.

9. If the transfer case cannot make the required shift, it will return to its previous mode.


10. If a malfunction occurs in the all-wheel drive system, the all-wheel drive system malfunction indicator will light up on the instrument panel.

11. To turn on or off the low-level all-wheel drive mode, the ignition must be turned on and the vehicle must be stationary or moving at a speed of no more than 3.2 km/h (it is preferable that it moves at a speed of 1 to 3 km/h), and the automatic transmission selector must be in position N (Neutral).

12. Turn the switch to the position corresponding to the desired operating mode of the transfer case. During the switching process, the indicator will flash, and when the switching is completed, it will light up continuously.

13. If you attempt to engage or disengage Low 4WD while the vehicle is in a driving gear and/or the vehicle is moving too fast, the indicator will flash for 30 seconds and the shift will not occur until the vehicle speed will drop to less than 3 km/h and the automatic transmission will not be engaged in N·mode (neutral).

14. If the transfer case cannot make the required shift within 30 seconds, it will return to its previous mode.

15. To switch the transfer case to N·mode (Neutral) for towing a car:

A) Park the vehicle so that it cannot roll, apply the parking brake, and start the engine.

b) Move the automatic transmission selector lever to position N (Neutral).

With) Switch the transfer case into rear wheel drive mode.

d) Turn the transfer case switch so that it passes through the low-range four-wheel drive position and hold it in this position for at least ten seconds. When the transfer case switches to "neutral", the transfer case neutral indicator will light up.


e) Move the automatic transmission selector lever to position R (Reverse) for one second, then move it to position D (Forward movement) also for one second.

f) Turn the key to the accessory power position.

g) Move the automatic transmission selector lever to position P (Parking).

h) Turn the ignition key to the LOCK position (Lock).

16. To switch the transfer case from N·mode (Neutral):

A) Pull the parking brake lever and press the service brake pedal.

b) Turn on the ignition, but do not start the engine.

With) Move the automatic transmission selector lever to position N (Neutral).

d) Turn the switch to the position corresponding to the desired operating mode of the transfer case.

When the transfer case switches from mode "neutral", the transfer case neutral indicator will go out.

e) Release the parking brake lever.

f) Start the engine and move the automatic transmission selector lever to the desired position.

About this guide

Purpose

The goal of the creators of this manual is to help the owner operate and maintain the vehicle in the most efficient way. Using this book will help you determine what work needs to be done (even if it is produced at a service station), will provide information on routine maintenance and allow you to determine the cause of the malfunction. We hope that the manual will be used when performing repairs and maintenance yourself. Sometimes (in relatively simple cases) Doing the work yourself may turn out to be faster than going to a service station, considering that you will have to go there twice - leave it and then pick up the car. It is important that you can save money by doing the work yourself. In addition to the above factors, a car enthusiast can experience a sense of moral satisfaction by independently servicing and repairing his own car.

Structure

The manual is divided into chapters. Each chapter consists of subsections, the titles of which are numbered and highlighted. Each subsection consists of numbered paragraphs.

At the beginning of each subsection there are links to illustrations that complement the description of the procedures. Illustration numbers identify the subsection and the corresponding paragraph. For example, illustration 3.2 corresponds to the second paragraph of the third subsection.

Procedures previously described in the text are usually not described again. If it is necessary to refer to another chapter, a link is provided indicating its number and the number of the corresponding subsection. Links given without words "chapter" refer to subsections and/or paragraphs of this chapter. For example, "see subsection 8", denotes a link to the eighth subsection of this chapter.

References to the left and right sides of the vehicle are provided when viewed from the driver's seat.

Although care has been taken in preparing this manual, the author and publishers are not responsible for any inaccuracies or omissions that may appear in this book.

Note: This note provides information necessary to properly complete or better understand this procedure.

Caution: The information contained in a caution refers to a specific operation or measure necessary to properly complete the procedure described. Failure to comply with this warning may result in damage to the affected unit or part.

Warning: The information contained in a warning refers to an operation or measure necessary to properly complete the procedure described. Failure to follow the instructions contained in this warning may result in personal injury or injury.

Brief descriptions of the Chevrolet TrailBlazer, Oldsmobile Bravada and GMS Envoy

The production of the Chevrolet Trailblazer, Oldsmobile Bravada and GMS Envoy SUVs discussed in this manual began in 2002. The cars have several versions: with two- and four-wheel drive, as well as with standard (5 passenger seats) and elongated (7 passenger seats) base. The described models are equipped with a 4.2 liter inline six-cylinder engine, as well as a six-speed automatic transmission with «overdrive».

The chassis has a classic layout: through an automatic transmission, torque is transmitted to the rear wheels from the engine located at the front. On all-wheel drive versions, engine power is transmitted not only to the rear axle, but also to the front differential, from where torque is transmitted to the front wheels through independent drive shafts.

The design of the front independent suspension uses struts consisting of shock absorbers and springs. The one-piece rear axle has four trailing arms, a transverse torque rod, springs and shock absorbers.

The steering is power-assisted and rack-and-pinion geared, which is mounted to the frame behind the front wheels. The design of the brake system with a vacuum booster, which has an ABS function, provides for the presence of front and rear disc brakes.