Front Suspension & Wheel Alignment Jeep Grand Cherokee WK2

SPECIAL TOOLS

10247 - Tool, Air Suspension Refill (Originally Shipped In Kit Number(s) 10247.) 8698-2 - Remover, Receiver Cup (Originally Shipped In Kit Number(s) 8685, 8685CC, 8712.) 8858-3 - Remover, Bushing (Originally Shipped In Kit Number(s) 8696, 8696CC, 8710, 8710CC.) 9654-1 - Installer, Ball Joint (Originally Shipped In Kit Number(s) 9587.) 9654-2 - Cup, Receiver Install (Originally Shipped In Kit Number(s) 9330, 9576, 9576-CAN, 9577, 9787.) C-3894-A - Puller, Tie Rod (Originally Shipped In Kit Number(s) 9202, 9202A-CAN, 9202CC, 9299, 9299CC, 9299CC, 9300A-CAN.) C-4150A - Press, Ball Joint (Originally Shipped In Kit Number(s) 6672, 6745.) C-4212F - Press, Ball Joint (Originally Shipped In Kit Number(s) 6745, 6880, 6881, MLR-C03.)

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DESCRIPTION

Scheme 6

Note. Suspension components with rubber/urethane bushings should be tightened with the vehicle at normal ride height. It is important to have the springs supporting the weight of the vehicle when the fasteners are torqued. If springs are not at their normal ride position, vehicle ride comfort could be affected and premature bushing wear may occur.

Wheel alignment involves the correct positioning of the wheels in relation to the vehicle. The positioning is accomplished through suspension and steering linkage adjustments. An alignment is considered essential for efficient steering, good directional stability and to minimize tire wear. The most important measurements of an alignment are caster, camber and toe.

OPERATION

1. CASTER (1) is the forward or rearward tilt of the steering knuckle from vertical. Tilting the top of the knuckle forward provides less positive caster. Tilting the top of the knuckle rearward provides more positive caster. Positive caster promotes directional stability. This angle enables the front wheels to return to a straight ahead position after turns.
2. CAMBER (2) is the inward or outward tilt of the wheel relative to the center of the vehicle. Tilting the top of the wheel inward provides negative camber. Tilting the top of the wheel outward provides positive camber. Incorrect camber will cause wear on the inside or outside edge of the tire.
3. TOE (4) is the difference between the leading inside edges and trailing inside edges of the front tires. Wheel toe position out of specification cause's unstable steering, uneven tire wear and steering wheel off- center. The wheel toe position is the final front wheel alignment adjustment.
4. THRUST ANGLE (3) is the angle of the rear axle relative to the centerline of the vehicle. Incorrect thrust angle can cause off-center steering and excessive tire wear. This angle is not adjustable, damaged component(s) must be replaced to correct the thrust angle.

PRE-ALIGNMENT INSPECTION

Before starting wheel alignment, the following inspection and necessary corrections must be completed. Refer to Suspension and Steering System Diagnosis Chart below for additional information.

1. Inspect tires for size, air pressure and tread wear.
2. Inspect front wheel bearings for wear.
3. Inspect front wheels for excessive radial or lateral runout and balance.
4. Inspect ball studs, linkage pivot points and steering gear for looseness, roughness or binding.
5. Inspect suspension components for wear and noise.
6. Check suspension ride height.
7. Road test the vehicle.

SUSPENSION AND STEERING SYSTEM DIAGNOSIS

Alignment is possible on the front and rear of this vehicle. For the front , caster, camber and toe can be adjusted. For the rear , only camber and toe can be adjusted, and caster is not adjustable.

Note. For alignment specifications. Refer to WHEEL ALIGNMENT, SPECIFICATIONS .

Scheme 7

Note. A different ride height setting is used for measuring curb height.

When checking or performing an alignment, vehicles equipped with Air Suspension (SER) must be in the manually selected "Sport" position (3) of the terrain select switch (10), or the Aero mode if using a scan tool. To change the ride height using the terrain select switch (10), the vehicle air suspension system must be in normal operating condition as follows

1. Scan tool disconnected
2. All doors closed
3. Liftgate closed
4. Engine running
5. Minimum battery voltage greater than 10.5 volts

CASTER AND CAMBER ADJUSTMENT - FRONT, ALL

Camber and caster angle adjustments involve changing the position of the lower control arm with the slots in the frame brackets to move the lower control arm inwards or outwards for proper adjustment. This can be achieved by using a long pry bar with a curved tip and inserting the pry bar into the lower control arm frame brackets and prying inwards or outwards.

Scheme 8

Moving the rear position of the lower control arm at the frame in or out, will change the caster angle significantly and camber angle only slightly. To maintain the camber angle while adjusting caster, move the rear of the lower control arm in or out. Then move the front of the lower control arm slightly in the opposite direction.

Move both the front and rear of the lower control arm together in or out. This will change the camber angle significantly and caster angle slightly.

After adjustment is made tighten the lower control arm REAR PIVOT VERTICAL BOLTS (1) to 220 N.m (162 ft. lbs.), the REAR PIVOT HORIZONTAL BOLTS (2) to 90 N.m (66 ft. lbs.), and the FRONT PIVOT BOLTS (4) to 120 N.m (89 ft. lbs.).

Scheme 9

The wheel toe position adjustment is the final adjustment of a front alignment.

1. Start the engine and turn wheels both ways before straightening the wheels. Secure the steering wheel with the front wheels in the straight-ahead position.
2. Loosen the tie rod jam nuts (1). NOTE: Each front wheel should be adjusted for one-half of the total toe position specification. This will ensure the steering wheel will be centered when the wheels are positioned straight-ahead.
3. Adjust the wheel toe position by turning the inner tie rod (2) as necessary.
4. Tighten the tie rod jam nut (1) to 75 NM (55 ft. lbs.).
5. Verify the specifications.
6. Turn off engine.

Scheme 10

1. Adjust the wheel camber position by loosening the camber link to cradle cam bolt/nut (1) just enough to rotate the cam bolt. Turning the cam bolt moves the camber link (2) in or out.
2. Tighten the camber link to cradle cam bolt/nut (1) to 93 NM (68 ft. lbs.).
3. Verify the specifications.

Scheme 11

1. Adjust the wheel toe position by loosening the toe link to cradle cam bolt/nut (3) just enough to rotate the cam bolt. Turning the cam bolt moves the toe link (5) in or out.
2. Tighten the toe link to cradle cam bolt/nut (3) to 93 NM (68 ft. lbs.).
3. Verify the specifications.

CURB HEIGHT MEASUREMENT

The wheel alignment is to be checked and all alignment adjustments made with the vehicle at its required curb height specification.

Vehicle height is to be checked with the vehicle on a flat, level surface, preferably a vehicle alignment rack. The tires are to be inflated to the recommended pressure. All tires are to be the same size as standard equipment. Vehicle height is checked with the fuel tank full of fuel, and no passenger or luggage compartment load.

Inspect the vehicle for bent or weak suspension components. Compare the parts tag on the suspect coil spring(s) to the parts book and the vehicle sales code, checking for a match. Once removed from the vehicle, compare the coil spring height to a correct new or known good coil spring. The heights should vary if the suspect spring is weak.

Ride height is measured at each corner of the vehicle by calculating the difference between the cradle bolt and the center of the wheel or axle heights as follows

AIR SUSPENSION SPECIFIC INFORMATION

Note. For vehicles with Air Suspension (SER), metric measurements must be used for accuracy AND when writing ride height values to the Air Suspension Control Module (ASCM) using a scan tool.

Note. A different ride height setting is used for checking or performing an alignment.

When measuring curb height, vehicles equipped with Air Suspension (SER) must be in the manually selected "Auto" position (5) of the terrain select switch (10), or the Normal Ride Height (NRH) mode if using a scan tool. To change the ride height using the terrain select switch (10), the vehicle air suspension system must be in normal operating condition as follows

1. Scan tool disconnected
2. All doors closed
3. Liftgate closed
4. Engine running
5. Minimum battery voltage greater than 10.5 volts

Scheme 12

Front: Bottom view of the front cradle bolt (1) to be measured from.

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1. Front Wheel Center Height - Measure the vertical distance between the front wheel center (1) and the ground (4), Record the measurement .
2. Front Cradle Height - Measure the vertical distance between the center of the cradle bolt (2) to the ground (3), Record the measurement .
3. Take the two measurements and subtract them to get the ride height. Refer to the Curb Height Specifications chart below for specifications. Rear: Bottom view of the rear cradle bolt (1) to be measured from. NOTE: For vehicles with Air Suspension (SER), metric measurements must be used for accuracy AND when writing ride height values to the Air Suspension Control Module (ASCM) using a scan tool.
4. Rear Wheel Center Height - Measure the vertical distance between the front wheel center (2) and the ground (3), Record the measurement .
5. Rear Cradle Height - Measure the vertical distance between the center of the cradle bolt (1) to the ground (4), Record the measurement .
6. Take the two measurements and subtract them to get the ride height. Refer to the Curb Height Specifications chart below for specifications.

CURB HEIGHT SPECIFICATIONS

SPECIFICATIONS

Note. Specifications are in degrees.

LHD WITH STANDARD SUSPENSION

FRONT - LHD WITH STANDARD SUSPENSION

REAR - LHD WITH STANDARD SUSPENSION

LHD WITH SPORT SUSPENSION

FRONT - LHD WITH SPORT SUSPENSION

REAR - LHD WITH SPORT SUSPENSION

LHD - WITH AIR SUSPENSION

Note. Vehicles equipped with Air Suspension must be in the manually selected "Sport" position (Aero mode) of the terrain select switch when checking vehicle ride height or alignment.

FRONT - LHD WITH AIR SUSPENSION

REAR - LHD WITH AIR SUSPENSION

RHD - WITH STANDARD SUSPENSION

FRONT - RHD WITH STANDARD SUSPENSION

REAR - RHD WITH STANDARD SUSPENSION

RHD - WITH AIR SUSPENSION

Note. Vehicles equipped with Air Suspension must be in the manually selected "Sport" position (Aero mode) of the terrain select switch when checking vehicle ride height or alignment.

FRONT - RHD WITH AIR SUSPENSION

REAR - RHD WITH AIR SUSPENSION

Scheme 16

Note. Suspension components with rubber/urethane bushings should be tightened with the vehicle at normal ride height. It is important to have the springs supporting the weight of the vehicle when the fasteners are torqued. If springs are not at their normal ride position, vehicle ride comfort could be affected and premature bushing wear may occur.

The front suspension is designed to allow each wheel to adapt to different road surfaces independently. The wheels are mounted to hub bearings (not shown in illustration) on the steering knuckles (1). The hub bearings are sealed and lubricated for life. The steering knuckles (1) turn (pivot) on ball joints (5) that are pressed into the outboard portion of the upper control arms (2,) and pressed into the steering knuckle (1) for the lower control arms (3). The ball joints (5) are lubricated for life. The upper and lower control arms (2, 3) are attached to the frame with bushings (4) that are not serviceable. The stabilizer bar (8) is attached to the lower control arms by a stabilizer bar link (6), and to the frame with stabilizer bar retaining bracket/bushings (7) that are not serviceable.

TORQUE

REMOVAL

Scheme 17

1. If equipped with air suspension (SER), with a scan tool, using the routines under the ASCM, perform the following: Disable the air suspension system. Run the Spring Deflate To Reservoir routine on the air suspension spring on the side where the lower control arm is to be removed.
2. Raise and support the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
3. Remove the tire and wheel assembly.
4. Remove the knuckle. Refer to «KNUCKLE, STEERING, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-suspension-wheel-alignment) .
5. Remove the stabilizer link (7) to lower control arm nut. NOTE: If equipped with four wheel drive, support the half shaft or remove with the lower control arm.
6. Remove the shock clevis bracket to lower control arm nut/bolt (6).
7. Remove the lower control arm front pivot nut and bolt (4) from the lower control arm (3).
8. Remove the lower control arm rear pivot vertical bolt and nut (1) and the lower control arm rear pivot horizontal bolt and nut (2) from the lower control arm (3) and remove from the vehicle.

INSTALLATION

Note. If equipped with four wheel drive, position the half shaft if removed with the lower control arm.

1. Position the lower control arm to the cradle.
2. Install the lower control arm rear pivot vertical bolt and nut (1). Do not tighten.
3. Install the lower control arm front pivot nut and bolt (4). Do not tighten.
4. Install the shock clevis bracket to lower control arm nut/bolt (6). Do not tighten.
5. Install the stabilizer link (7) to lower control arm nut. Do not tighten.
6. Install the knuckle. Refer to «KNUCKLE, STEERING, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-suspension-wheel-alignment) .
7. Support the outside of the lower control arm with a suitable holding fixture, and raise to normal ride height.
8. Tighten the lower control arm rear pivot vertical bolt and nut (1) to 220 N.m (162 ft. lbs.), and tighten the lower control arm rear pivot horizontal bolt and nut (2) to 90 N.m (66 ft. lbs.).
9. Tighten the lower control arm front pivot nut and bolt (4) to 120 N.m (89 ft. lbs.)
10. Tighten the shock clevis bracket to lower control arm nut/bolt (6) to 235 N.m (173 ft. lbs.).
11. Tighten the stabilizer link (7) to lower control arm nut to 122 N.m (90 ft. lbs.).
12. Install the tire and wheel assembly. Refer to «WHEELS, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/wheel-tire-system/#tires-wheels-service-information) .
13. Remove the supports and lower the vehicle.
14. If equipped with air suspension, with a scan tool, using the routines under the Air Suspension Control Module (ASCM), perform the following: Fill Spring From Reservoir/Complete Fill on the air suspension spring on the side where the lower control arm was installed. Run the Air Mass Calculation routine on the air suspension system. If necessary, add to the system or deflate to atmosphere using the ASCM routines, then repeat the Air Mass Calculation routine again until system responds with Air Mass OK (188 - 216 bar-liters). Enable the air suspension system.
15. If equipped with air suspension, perform the ASCM Verification Test. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-air-suspension-control-module-ascm-electrical-diagnostics) .
16. Perform wheel alignment. Refer to «WHEEL ALIGNMENT, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-suspension-wheel-alignment) .

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1. If equipped with air suspension (SER), with a scan tool, using the routines under the ASCM, perform the following: Disable the air suspension system. Run the Spring Deflate To Reservoir routine on the air suspension spring on the side where the upper control arm is to be removed.
2. Secure the steering wheel in the straight ahead position.
3. If equipped, remove the wiring harness routing clip (2) from the shock mounting stud. NOTE: Loosen the shock retainer nuts only. The shock must be tilted for removal of the control arm bolts.
4. Loosen the three upper shock mounting nuts (1).
5. Remove the cowl panel cover, and the silencer. Refer to «COVER, COWL PANEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) and «SILENCER, COWL EXTENSION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) . NOTE: 3.6L shown in illustration, others similar.
6. For the left side only, remove the air cleaner housing as follows: Remove the air cleaner. Loosen the fresh air intake clamp (4) and disconnect the hose from housing cover (1). Disconnecting the PCV air return hose and the power steering hose routing clip (not shown in illustration) from the air cleaner body. Disconnect the weatherstrip (3) from the housing inlet and reposition. Remove the pushpin (2) and lift the housing from the body grommets to remove.
7. For the left side only, remove the steering intermediate shaft pinch bolt (1), disconnect the coupler (3) and position aside for clearance.
8. For the right side only, remove the two nuts (2) that secure the HVAC air inlet duct (1) to the engine compartment side of the dash panel (3) and remove the duct.
9. Raise and support the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
10. Remove the tire and wheel assembly.
11. If equipped with a height sensor, disconnect the height sensor from the upper control arm ball stud.
12. Remove the speed sensor bolt (2), and remove the sensor from the knuckle.
13. Remove the speed sensor wiring retaining clip from the knuckle.
14. Support the outside of the lower control arm (8) with a suitable holding fixture, and raise to normal ride height.
15. Remove the clevis to lower control arm bolt/nut (6).
16. Remove the upper ball joint retaining nut (4) from the ball joint (2).
17. Separate the upper ball joint (2) from the knuckle (3) using Ball Joint Press (special tool #C-4150A, Press, Ball Joint) (1). NOTE: It is necessary to pull the bottom of the shock assembly outward just enough to remove the upper control arm flag bolts (1) without completely removing the shock assembly.
18. Remove the nuts and flag bolts (1) securing the upper control arm (5) to the body.
19. Remove the upper control arm (5) from the vehicle.

1. Position the upper control arm (5) to the vehicle. NOTE: It is necessary to pull the bottom of the shock assembly outward just enough to install the upper control arm flag bolts (1) without completely removing the shock assembly. NOTE: Tighten the upper control arm to body bolts in the following sequence: Left side, front then rear. Right side, rear then front.
2. Install the nuts and flag bolts (1) securing the upper control arm (5) to the body and tighten to 60 N.m (44 ft. lbs.).
3. Install the upper ball joint (2) into the knuckle (3).
4. Install the upper ball joint retaining nut (4) and tighten to 95 N.m (70 ft. lbs.).
5. If equipped with a height sensor, connect the height sensor to the upper control arm.
6. Install the speed sensor wiring retaining clip to the knuckle.
7. Install the speed sensor, and install the speed sensor bolt (2) and tighten to 10.7 N.m (95 in. lbs.).
8. Install the clevis to lower control arm bolt/nut (6) and tighten to 235 N.m (173 ft. lbs.).
9. Install the tire and wheel. Refer to «WHEEL INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/wheel-tire-system/#tires-wheels-service-information__wheel-installation) .
10. Remove the supports and lower the vehicle.
11. Tighten the three upper shock mounting nuts (1) to 28 N.m (21 ft. lbs.).
12. If equipped, attach the wiring harness routing clip (2) to the shock mounting stud.
13. For the right side only, position the HVAC air inlet duct (1) to the engine compartment side of the dash panel (3). Install the two nuts (2) that secure the HVAC air inlet duct (1) to the dash panel (3) and tighten to 4.5 N.m (40 in. lbs.).
14. For the left side only, connect the steering intermediate shaft coupler (3), install the pinch bolt (1) and tighten to 45 N.m (33 ft. lbs.). NOTE: 3.6L shown in illustration, others similar.
15. For left side only, install the air cleaner housing as follows: Press the air cleaner housing onto the body grommets and install the pushpin (2). Route and connect the weather-strip (3) to the housing inlet. Connect the PCV air return hose and the power steering hose routing clip (not shown in illustration) to the air cleaner body. Connect the fresh air intake hose to the housing cover (1) and tighten the clamp (4). Install the air cleaner.
16. Install the silencer and the cowl panel cover. Refer to «INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) and «COVER, COWL PANEL, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
17. If equipped with air suspension, with a scan tool, using the routines under the Air Suspension Control Module (ASCM), perform the following: Fill Spring From Reservoir/Complete Fill on the air suspension spring on the side where the upper control arm was installed. Run the Air Mass Calculation routine on the air suspension system. If necessary, add to the system or deflate to atmosphere using the ASCM routines, then repeat the Air Mass Calculation routine again until system responds with Air Mass OK (188 - 216 bar-liters). Enable the air suspension system.
18. If equipped with air suspension, perform the ASCM Verification Test. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-air-suspension-control-module-ascm-electrical-diagnostics) .

DIAGNOSIS AND TESTING - LOWER BALL JOINT

1. Raise the front of the vehicle. Place safety floor stands under both lower control arms as far outboard as possible. Lower the vehicle to allow the stands to support some or all of the vehicle weight. NOTE: The dial indicator plunger must be perpendicular to the machined surface of the steering knuckle.
2. Mount a dial indicator solidly to the topside of the lower control arm.
3. Position the indicator plunger against the bottom surface of the steering knuckle and then zero the dial indicator.
4. Position a pry bar under the tire assembly. Pry upward on the tire assembly.
5. If the travel exceeds 0.5 mm (0.020 in.), replace the lower ball joint. Refer to «BALL JOINT, SUSPENSION, LOWER, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-suspension-wheel-alignment) .

Scheme 25

1. Raise and support the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
2. Remove the knuckle. Refer to «KNUCKLE, STEERING, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-suspension-wheel-alignment) . NOTE: Extreme pressure lubrication must be used on the threaded portions of Ball Joint Press (special tool #C-4212F, Press, Ball Joint). This will increase the longevity of the tool and insure proper operation during the removal and installation process.
3. Press the ball joint (not shown in illustration, inside tool) from the knuckle (3) using Ball Joint Press (special tool #C-4212F, Press, Ball Joint) (1), Remover/Installer (special tool #8858-3, Remover, Bushing) (2), and Ball Joint Remover/Installer (special tool #8698-2, Remover, Receiver Cup) (4).

Scheme 26

Note. Extreme pressure lubrication must be used on the threaded portions of Ball Joint Press (special tool #C-4212F, Press, Ball Joint). This will increase the longevity of the tool and insure proper operation during the removal and installation process.

1. Position the ball joint (4) into the knuckle (3) and press in using Ball Joint Press (special tool #C-4212F, Press, Ball Joint) (1), Ball Joint Remover/Installer (special tool #9654-2, Cup, Receiver Install) (2), and Ball Joint Remover/Installer (special tool #9654-1, Installer, Ball Joint) (5).
2. Install the steering knuckle. Refer to «KNUCKLE, STEERING, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-suspension-wheel-alignment) .

Scheme 27

1. Raise the front of the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
2. Place safety floor stands under both lower control arms as far outboard as possible. Lower the vehicle to allow the stands to support some or all of the vehicle weight.
3. Remove the front tires.
4. Mount a dial indicator (1) solidly to the frame. NOTE: The dial indicator plunger must be perpendicular to the machined surface of the ball joint.
5. Position the dial indicator plunger on the topside of the upper ball joint (5), and then zero the dial indicator. NOTE: Use care not to pry or tear the ball joint boot, when checking the free play.
6. Position a pry bar (3) between the steering knuckle (4) and the upper control arm (2). Pry upwards on the upper control arm.
7. If the travel exceeds 0.5 mm (0.020 in.), replace the upper control arm. Refer to «ARM, UPPER CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-suspension-wheel-alignment) .
8. If the upper ball joint is within specs reinstall the front tires. Refer to «WHEELS, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/wheel-tire-system/#tires-wheels-service-information) .

Scheme 28

1. Raise and support the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
2. Remove the wheel and tire assembly.
3. Remove the brake rotor. Refer to «ROTOR, BRAKE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical-hydraulic/#base-brakes-service-information) .
4. Remove the wheel speed sensor bolt (1) and remove the wheel speed sensor from the knuckle (2).
5. Remove the 3 hub bearing mounting bolts (3) from the back of the steering knuckle (2). Remove hub bearing from the steering knuckle (2).

Scheme 29

1. Raise and support the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
2. Remove the wheel and tire assembly.
3. Remove the brake rotor. Refer to «ROTOR, BRAKE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical-hydraulic/#base-brakes-service-information) .
4. Remove the half shaft nut.
5. Remove the stabilizer link to lower control arm nut and position link (7) aside.
6. Remove the speed sensor bolt (2), and remove the sensor from the knuckle.
7. Remove the speed sensor wiring retaining clip from the knuckle.
8. Remove the upper ball joint nut.
9. Separate the upper ball joint (2) from the knuckle (3) using Ball Joint Press (special tool #C-4150A, Press, Ball Joint) (1).
10. Tilt the knuckle (4) out, and from out side the hub, push the half shaft (1) into the hub (3) for access to the hub/bearing bolts (2).
11. Remove the hub/bearing bolts (2) and remove the hub/bearing (3) from the knuckle assembly.

4X2

1. Position the hub bearing into the knuckle (2), install the 3 bolts (3) and tighten to 105 N.m (78 ft. lbs.).
2. Install the wheel speed sensor into the knuckle (2), install the sensor mounting bolt (1) and tighten to 11 N.m (95 in. lbs.).
3. Install the brake rotor. Refer to «ROTOR, BRAKE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical-hydraulic/#base-brakes-service-information) .
4. Install the wheel and tire assembly. Refer to «WHEELS, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/wheel-tire-system/#tires-wheels-service-information) .
5. Remove the support and lower the vehicle.

4X4

1. Position the hub/bearing, install the hub/bearing bolts (2) and tighten to 105 N.m (78 ft. lbs.).
2. Support the outside of the lower control arm with a suitable holding fixture, and raise to position the upper ball joint (2) into the knuckle (3).
3. With the holding fixture holding the suspension at normal ride height, install the upper ball joint nut (4) and tighten to 95 N.m (70 ft. lbs.).
4. Install the half shaft nut and tighten to 310 N.m (229 ft. lbs.).
5. Install the brake rotor. Refer to «ROTOR, BRAKE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical-hydraulic/#base-brakes-service-information) .
6. Route and attach speed sensor wiring to the knuckle.
7. Install the wheel speed sensor into the knuckle, install the mounting bolt (2) and tighten to 10.7 N.m (95 in. lbs.).
8. Position the stabilizer link (7) to lower control arm (8), install the nut and tighten to 122 N.m (90 ft. lbs.).
9. Install the tire and wheel assembly. Refer to «WHEELS, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/wheel-tire-system/#tires-wheels-service-information) .
10. Remove the supports and lower the vehicle.

Scheme 30

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Scheme 33

1. Raise and support the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
2. Remove the tire and wheel assembly.
3. If equipped with four wheel drive, remove the half shaft nut.
4. Remove the speed sensor bolt (1), and remove the sensor from the knuckle (2).
5. Remove the speed sensor wiring retaining clip from the knuckle (2). CAUTION: Never allow the disc brake caliper to hang from the brake hose. Damage to the brake hose will result. Provide a suitable support to hang the caliper securely.
6. Remove the rotor. Refer to «ROTOR, BRAKE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical-hydraulic/#base-brakes-service-information) .
7. Remove the outer tie rod end retaining nut.
8. Separate the outer tie rod end (4) from the steering knuckle (2) using Tie Rod Puller (special tool #C-3894-A, Puller, Tie Rod) (1).
9. Support the outside of the lower control arm with a suitable holding fixture, and raise to normal ride height.
10. Remove the upper ball joint nut.
11. Separate the upper ball joint (2) from the knuckle (3) using Ball Joint Press (special tool #C-4150A, Press, Ball Joint) (1).
12. If equipped with four wheel drive, tilt the knuckle (2) out enough to disengage the half shaft (4) from the hub/bearing, then pry the half shaft (4) from the axle/axle tube with a pry bar and position aside for access to remove the lower ball joint nut (3). NOTE: Due to the taper of the lower ball joint, no special tool is needed to separate the knuckle from the control arm. When the nut is removed, the knuckle will pull away from the lower control arm.
13. While supporting the knuckle (3), remove the lower ball joint nut (1).
14. Remove the knuckle (3) from the vehicle.
15. If necessary, remove the 3 hub bearing mounting bolts (3) from the back of the steering knuckle (2) and remove the hub/bearing (4) from the steering knuckle (2).
16. If necessary, remove the brake shield (1) from the knuckle (2).

1. Position the brake shield (1) on the knuckle (2).
2. Position the hub/bearing (4) on the knuckle (2), install the 3 hub bearing mounting bolts (3) and tighten to 105 N.m (78 ft. lbs.).
3. Position the knuckle (2) on the lower ball joint and install the lower ball joint nut (3) and tighten to 230 N.m (170 ft. lbs.).
4. If equipped with four wheel drive, install half shaft (1) in the axle using care not to damage the seals, and through the hub/bearing. Verify half shaft has engaged.
5. Support the outside of the lower control arm with a suitable holding fixture, and raise to position the upper ball joint (2) into the knuckle (3).
6. With the holding fixture holding the suspension at normal ride height, install the upper ball joint nut (4) and tighten to 95 N.m (70 ft. lbs.).
7. Position the outer tie rod end (3) to the steering knuckle, install the nut (1) and tighten to 95 N.m (70 ft. lbs.).
8. Install the brake rotor. Refer to «ROTOR, BRAKE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical-hydraulic/#base-brakes-service-information) .
9. Route and attach speed sensor wiring to the knuckle.
10. Install the wheel speed sensor into the knuckle (2), install the mounting bolt (1) and tighten to 10.7 N.m (95 in. lbs.).
11. If equipped with four wheel drive, install the half shaft nut and tighten to 310 N.m (229 ft. lbs.).
12. Install the tire and wheel assembly. Refer to «WHEELS, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/wheel-tire-system/#tires-wheels-service-information) .
13. Remove the supports and lower the vehicle.

Scheme 34

Scheme 35

1. Raise and support the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
2. Remove the tire and wheel assembly.
3. Support the outside of the lower control arm with a suitable holding fixture, and raise to normal ride height.
4. Remove the stabilizer link lower nut (4).
5. Remove the stabilizer link upper nut (4).
6. Remove the stabilizer link (6).

1. Position the stabilizer link (6) to the vehicle.
2. Install the stabilizer link upper nut (4) and tighten to 122 N.m (90 ft. lbs.).
3. Install the stabilizer link lower nut (4) and tighten to 122 N.m (90 ft. lbs.).
4. Install the tire and wheel assembly. Refer to «WHEELS, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/wheel-tire-system/#tires-wheels-service-information) .
5. Remove the support and lower the vehicle.

For vehicles without air suspension , the top of the shock absorbers are bolted to the body. The bottom of the shocks are welded to the clevis bracket then the bracket is bolted to the lower control arm. The standard shocks have conventional twin tube construction and are low pressure gas charged. Gas charging prevents cavitation during rough road operation.

Scheme 36

Note. Before disconnecting a shock on an air suspension (SER) equipped vehicle, the spring and shock assembly must be deflated.

For air suspension (SER) equipped vehicles, a spring and shock assembly (2) replaces the coil over shock on the front of the vehicle. The spring and shock assembly incorporates the air spring, shock, mounting brackets, and an air fitting (1) for the air line. Service for the spring and shock assembly is as a complete assembly. For spring and shock assembly replacement procedures on air suspension equipped vehicles, refer to WITH AIR SUSPENSION (SER) and WITH AIR SUSPENSION (SER) .

For more information on the air suspension system, refer to DESCRIPTION .

Scheme 37

Scheme 38

Scheme 39

1. If equipped, remove the wiring harness routing clip (2) from the shock mounting stud.
2. Remove the three upper shock mounting nuts (1).
3. Turn the wheels so the front of the tire on the side being serviced is turned to the inside of the vehicle.
4. Raise and support the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
5. Remove the tire and wheel assembly.
6. Remove the speed sensor bolt (1), and remove the sensor from the knuckle (2).
7. Remove the speed sensor wiring retaining clip from the knuckle (2).
8. Bottom caliper pistons into the caliper.
9. Remove the brake caliper tension clip (1) by pressing rearward on the front of the clip (2) while pulling the clip out (3) from the caliper.
10. Remove the caliper slide dust bolt shields and loosen the brake caliper slide bolts (guide pins) (2). CAUTION: Never allow the disc brake caliper to hang from the brake hose. Damage to the brake hose will result. Provide a suitable support to hang the caliper securely.
11. Remove the brake caliper (3) from the caliper adapter (4) and hang the brake caliper.
12. Support the outside of the lower control arm with a suitable holding fixture, and raise to normal ride height.
13. Remove the upper ball joint nut.
14. Separate the upper ball joint (2) from the knuckle (3) using Ball Joint Press (special tool #C-4150A, Press, Ball Joint) (1).
15. Remove the lower stabilizer link nut (7) at the lower control arm.
16. Remove the lower clevis bolt/nut (6) at the lower control arm. NOTE: It may be necessary to lift on the upper control arm (2) for clearance to remove shock (1).
17. With the knuckle assembly (3) tilted out, lower the control arm support as necessary and lift the shock assembly (1) (into the shock tower) and remove from the vehicle by tilting the bottom of the shock out and to the rear.
18. Remove and transfer the spring and mount if necessary. Refer to «SPRING, FRONT COIL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-suspension-wheel-alignment) .

1. If equipped, remove the wiring harness routing clip (2) from the shock mounting stud.
2. Remove the three upper shock mounting nuts (1).
3. Turn the wheels so the front of the tire on the side being serviced is turned to the inside of the vehicle.
4. Raise and support the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) . NOTE: With the upper shock assembly mounting nuts removed, the half shaft and the shock assembly will come out together.
5. Remove the half shaft. Refer to «REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/axle-shafts/#front-half-shaft) .
6. Remove and transfer the spring and mount if necessary. Refer to «SPRING, FRONT COIL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-suspension-wheel-alignment) .

WITH AIR SUSPENSION (SER)

Scheme 40

1. Raise and support the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
2. With a scan tool, using the routines under the ASCM, perform the following: Disable the air suspension system. Run the Spring Deflate To Reservoir routine on the air suspension spring and shock assembly to be removed.
3. If equipped, remove the wiring harness routing clip from the shock mounting stud. NOTE: Do not remove the fitting from the air line. During installation the same fitting will be used. CAUTION: Only remove the air line fitting (hex portion) and not the Pressure Retention Valve (round portion) of the brass assembly on top of the air suspension spring and shock assembly. Removing and reinstalling the valve (round) part of the assembly may cause a leak.
4. Disconnect the air line and fitting (1) from the air suspension spring and shock assembly.
5. Remove the shock upper mounting nuts (2).
6. Turn the wheels so the front of the tire on the side being serviced is turned to the inside of the vehicle. NOTE: There is not enough clearance to remove the air suspension spring and shock assembly without complete removal of the half shaft. With the upper shock assembly mounting nuts and air line removed, the half shaft and the air suspension spring and shock assembly can come out together.
7. Remove the half shaft and air suspension spring and shock assembly together. Refer to «REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/axle-shafts/#front-half-shaft) .

1. Position the shock assembly (1) to the vehicle and install the clevis to lower control arm bolt/nut. Do not tighten.
2. Support the outside of the lower control arm with a suitable holding fixture, and raise to normal ride height while guiding the upper shock mount into the proper position.
3. Position the stabilizer link, install the nut (7) and tighten to 122 N.m (90 ft. lbs.).
4. Tighten the lower clevis bolt/nut (6) to 235 N.m (173 ft. lbs.).
5. Position the upper ball joint into the knuckle, install the ball joint nut and tighten to 95 N.m (70 ft. lbs.).
6. Position the brake caliper/pads and tighten the brake caliper slide bolts (guide pins) (2) to 55 N.m (41 ft. lbs.).
7. Install the caliper slide bolt dust shields.
8. Install the brake caliper tension clip (1).
9. Install the speed sensor and retaining bolt (1), and tighten to 10.7 N.m (95 in. lbs.).
10. Install the speed sensor wiring retaining clip to the knuckle (2).
11. Install the tire and wheel assembly. Refer to «WHEELS, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/wheel-tire-system/#tires-wheels-service-information) .
12. Remove the supports and lower the vehicle.
13. Tighten the three upper shock mounting nuts (1) to 28 N.m (21 ft. lbs.).
14. If equipped, install the wiring harness routing clip (2) on the shock mounting stud.
15. Pump brake pedal until caliper pistons and brake pads are seated and a firm brake pedal is obtained.

1. Position the shock assembly (1) to the vehicle aligning the upper shock mounting studs into the body.
2. Install the upper shock mounting nuts and tighten to 28 N.m (21 ft. lbs.).
3. If equipped, install the wiring harness routing clip (2) on the shock mounting stud.
4. Install the half shaft. Refer to «INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/axle-shafts/#front-half-shaft) .
5. Remove the supports and lower the vehicle.
6. Pump brake pedal until caliper pistons and brake pads are seated and a firm brake pedal is obtained.

Scheme 41

1. Position the half shaft (2) and air suspension spring and shock assembly (1) to the vehicle aligning the upper shock mounting studs into the body, and the halfshaft (2) to the axle.
2. Install the half shaft (2). Refer to «INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/axle-shafts/#front-half-shaft) .
3. Install the upper shock mounting nuts and tighten to 28 N.m (21 ft. lbs.).
4. If a new air suspension spring and shock assembly is used, remove the cap/fitting from the air line connection of the assembly.
5. Using the original fitting (1) connect the air line to the air suspension spring and shock assembly and tighten to 5.5 N.m (49 in. lbs.).
6. If equipped, install the wiring harness routing clip (2) on the shock mounting stud.
7. Install the tire and wheel. Refer to «WHEELS, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/wheel-tire-system/#tires-wheels-service-information) .
8. Remove the support and lower the vehicle.
9. With a scan tool, using the routines under the Air Suspension Control Module (ASCM), perform the following: Fill Spring From Reservoir/Complete Fill (on the spring/shock replaced). Run the Air Mass Calculation routine on the air suspension system. If necessary, add to the system or deflate to atmosphere using the ASCM routines, then repeat the Air Mass Calculation routine again until system responds with Air Mass OK (188 - 216 bar-liters). Enable the air suspension system.
10. Perform the ASCM Verification Test. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-air-suspension-control-module-ascm-electrical-diagnostics) .

For vehicles without air suspension, a coil over shock is used.

Note. Before disconnecting a shock on an air suspension (SER) equipped vehicle, the spring and shock assembly must be deflated.

For air suspension (SER) equipped vehicles, an air suspension spring and shock assembly (2) replaces the coil over shock on the front of the vehicle. The air suspension spring and shock assembly incorporates the air spring, shock, mounting brackets, and an air fitting (1) for the air line. Service for the air suspension spring and shock assembly is as a complete assembly.

For more information on the air suspension system, refer to DESCRIPTION .

For vehicles without air suspension, a coil over shock is used. For vehicles with air suspension, an air suspension spring and shock assembly works the same as a coil over shock with the exception of an air bag replacing the spring to adjust vehicle height, depending on driving conditions and driver input. An air line is attached to the air suspension spring and shock assembly on the top. For more information on the air suspension system, refer to DESCRIPTION .

Scheme 42

Scheme 43

1. Remove the shock. Refer to «SHOCK ABSORBER, SUSPENSION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-suspension-wheel-alignment) .
2. Install the shock assembly in the Branick 7200® spring removal/installation tool or equivalent (1).
3. Compress the spring (2).
4. Remove the upper shock nut (2). NOTE: The nub (1) in the upper shock mount (3) must be 180° from the centerline of the lower bracket (9) on the shock (8) for proper installation.
5. Remove the shock (8).
6. Remove the shock upper mount (3).
7. Remove and inspect the upper (5) and lower (7) spring isolators.

Service for the air suspension spring and shock assembly is as a complete assembly including the shock. For removal of the air suspension spring and shock assembly. Refer to SHOCK ABSORBER, SUSPENSION, REMOVAL .

Scheme 44

1. Compress the spring (2).
2. Install the lower isolator (7). NOTE: Make sure the jounce bumper (4) is installed in the upper mount.
3. Position the shock (8) into the coil spring (6).
4. Install the upper isolator and dust shield assembly (5). NOTE: For proper orientation the nub hole (1) in the upper shock plate (3) must be 180° in a centerline from the bracket (9) at the bottom of the shock (8).
5. Install the upper shock mount (3).
6. Install the shock upper mounting nut (2) Tighten to 50 N.m (37 ft. lbs.).
7. Decompress the spring.
8. Remove the shock assembly from the spring compressor tool (1).
9. Install the shock assembly. Refer to «SHOCK ABSORBER, SUSPENSION, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-suspension-wheel-alignment) .

Service for the air suspension spring and shock assembly is as a complete assembly including the shock. For installation of the air suspension spring and shock assembly. Refer to SHOCK ABSORBER, SUSPENSION, INSTALLATION .

Note. A drive on hoist is recommended to keep suspension at normal ride height due to tension on the stabilizer bar.

1. Raise and support the vehicle. Refer to «JACKING AND HOISTING LIFT POINTS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
2. Remove the front skid plate. Refer to «PLATE, SKID, FRONT, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) and «PLATE, SKID, FRONT SUSPENSION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) .
3. Remove the stabilizer bar link upper nut (4) on both sides.
4. Remove the two stabilizer bushing clamp (7) bolts on each side.
5. Remove the stabilizer bar (8).
6. Remove and transfer any necessary components.

1. Position the stabilizer bar (8) to the vehicle.
2. Install the stabilizer bushing clamps and tighten the two bolts on each side to 122 N.m (90 ft. lbs.).
3. Position the stabilizer link (6) to the stabilizer bar (5), install the nut (4) and tighten to 122 N.m (90 ft. lbs.).
4. Install the front skid plate. Refer to «PLATE, SKID, FRONT, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) and «PLATE, SKID, FRONT SUSPENSION, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) .
5. Remove the supports and lower the vehicle.

WARNING

Scheme 45

The air suspension system automatically or manually (operator control) lowers and lifts the vehicle using rear air suspension springs (air bag) (7) and front air suspension spring and shock assemblies (3) which replace the standard springs in the rear, and standard spring/shock in the front. The air suspension system uses multiple integrated components in various areas of the vehicle to accomplish this.

Below is a list of the components of the air suspension system. For more information on the individual components, refer to the specific components Description and Operation.

1. Air suspension reservoir (1)
2. Air Suspension Control Module (ASCM) (2)
3. Air suspension spring and shock assembly (3)
4. Air suspension compressor assembly (includes valve block) (4)
5. Compressor assembly valve block (part of 4, can be serviced separately)
6. Height sensor, front (5)
7. Air lines (6)
8. Air suspension spring (7)
9. Height sensor, rear (8)
10. Air suspension temperature sensor (not shown in illustration, connected to compressor)
11. Air suspension hose assembly (not shown in illustration, connected to compressor)
12. Air suspension reservoir bracket (not shown in illustration)
13. Terrain select switch (not shown in illustration, on center console)

Note. The air suspension system will auto-disable when lifted on a frame hoist, or when jacking one corner of the vehicle. The air suspension may attempt to change height slightly prior to switching to auto-disable. A manual disable is also available by pressing the "Up" and "Down" switches of the terrain select switch simultaneously for more that 5 seconds. The air suspension system will return to normal operation when the vehicle speed reaches 25 kph (15 mph).

Note. The air suspension system will not lower if any of the doors or liftgate is open (normal operation) or the engine is not running. Doors and liftgate status are ignored when using a scan tool.

Note. When the Air Suspension Control Module (ASCM) or any height sensor is replaced the ASCM will need to be initialized using a scan tool. Refer to the appropriate installation procedure for specific instructions.

General Information

The air suspension system is designed to raise and lower the vehicle height as required depending on driver request using the terrain select switch, or automatically with the terrain select switch in the Auto position. There is an Air Suspension Control Module (ASCM) located under the driver's seat which contains the logic and controls for the system. Multiple modules work together to increase vehicle stability and traction along with vehicle ride height. The ASCM uses several Controller Area Network (CAN) data bus systems for inputs and outputs of the information necessary for the different systems to operate. The use of a scan tool is necessary for diagnostics, and replacement of any pressurized components. Height sensors on each corner of the vehicle monitor the vehicle height. The front of the vehicle is raised/lowered with two air suspension spring and shock assemblies, and the rear uses two air suspension springs.

The air suspension is a closed type system that does not draw in fresh air during vehicle lifting or leveling. Instead, it moves pressurized air back and forth between an air suspension reservoir and the four air springs as required to raise or lower a specific corner of the vehicle. The air suspension compressor assembly includes an air suspension valve block, controlled by the ASCM. The valve block isolates and actuates the raising and lowering of each pressurized component using individual air lines for the air springs and reservoir. The air suspension compressor does have a filtered air suspension hose assembly for adding air volume if a component of the system loses its air pressure and is replaced. The compressor is not intended to replenish the entire systems air volume. There is a procedure for complete system fill using an external source if it is necessary; however, this should only be necessary if the air suspension compressor or air compressor valve block is replaced.

Refilling the System

If the air suspension system is fully depleted of air it can be refilled using a scan tool and Air Suspension Refill Tool - (special tool #10247, Tool, Air Suspension Refill) which is used with a nitrogen supply tank (can be acquired at a local gas supplier). The nitrogen must be Purity Class 5 (99.999% pure) . The size and volume of the nitrogen supply tank will determine how many air suspension systems can be filled.

Changing Ride Height

Using the terrain select switch, ride height can only be changed while the air suspension system is in normal operating conditions. To change the ride height using the terrain select switch. Air suspension system normal operating conditions are as follows

1. Scan tool disconnected
2. All doors closed
3. Liftgate closed
4. Engine running
5. Minimum battery voltage greater than 10.5 volts

Using a scan tool, ride height can be changed regardless of the engine state (running or not), doors or liftgate state (open or closed). The only condition necessary is that battery voltage must be greater than 10.5 volts.

Ride Heights for Suspension Measurements or Adjustments

When checking or performing an alignment the air suspension system must be in the manually selected "Sport" position of the terrain select switch or the Aero mode if using a scan tool. When measuring curb height, the air suspension system must be in the manually selected "Auto" position of the terrain select switch, or the Normal Ride Height (NRH) mode if using a scan tool.

Manual Control

A terrain select switch is located on the console for driver control of the system. When the driver presses the terrain select switch to manually (two RH buttons) raise or lower the vehicle height the Electronic Vehicle Information Center (EVIC) displays a vehicle "up" or "down" icon and a LED indicator on the switch changes position. The EVIC displays the current position of the vehicle when it is achieved. When lowering the vehicle, the front is always first to move. When raising the vehicle, the rear is always the first to move. When the ASCM receives a command to change the vehicle more than one ride height position the action is performed in multiple steps. If request to change by two positions the rear will raise one position, then the front will raise one position, the rear again raises one position, then the front will raise to the final position. If requested to lower more than one position the same steps happen, EXCEPT the front moves first. This multi-step motion controls the angle the headlights are projected by controlling the pitch of the vehicle, keeping them from going above their normal projection plane.

There are five predetermined manual height settings; Normal Ride Height (NRH), two above and two below NRH. The predetermined vehicle heights (above or below NRH) are as follows

1. Off-Road 2 (OR2), + 65 mm (2.6 in.) (Except if equipped with AMS + 56 mm [2.2 in.])
2. Off-Road 1 (OR1), + 33 mm (1.3 in.) (Except if equipped with AMS + 28 mm [1.1 in.])
3. Aero Mode, - 15 mm (0.59 in.)
4. Park Mode, - 40 mm (1.57 in.)

Automatic Control

There are five choices for automatic control using the center rotating knob of the terrain select switch. The choices are Auto, Sport, Snow, Sand/Mud, and Rock. When the driver chooses an automatic setting multiple systems are affected for the best vehicle performance. Some of the modules whose systems use these settings are

1. Air Suspension Control Module (ASCM)
2. Antilock Brake Module (ABS)
3. Automatic Headlamp Leveling Module (AHLM)
4. Drivetrain Control Module (DTCM)
5. Powertrain Control Module (PCM)
6. Steering Control Module (SCM)

The basics of how the different automatic settings effect the systems are listed below

1. Auto - When in 4WD High range the vehicle height is at NRH. The vehicle systems are set to normal performance settings. Combines optimal traction with seamless steering feel. When in 4WD Low range the vehicle height adjusts to 38 mm (1.49 in.) above NRH, the transfer case locks, and the transmission shifting adjusts to off road shifting.
2. Sport - When in 4WD High range the vehicle height adjusts to 15 mm (0.59 in.) below NRH. Electronic Stability Control (ESC) and traction control tuning thresholds are raised, and the Antilock Brake Control (ABS) allows less wheel slip, all to allow more driver control. Also the transmission shifting adjusts to a higher performance shifting. Not available in 4WD Low range .
3. Snow - When in 4WD High range the vehicle height is at NRH. Traction control is adjusted to allow less wheel slip, and initial vehicle launch will be in second gear. When in 4WD Low range the vehicle height adjusts to 33 mm (1.3 in.) above NRH, the transfer case locks, the transmission shifting and ABS adjusts to off road settings.
4. Sand/Mud - When in 4WD High range the vehicle height adjusts to 38 mm (1.49 in.) above NRH. Electronic Stability Control (ESC) tuning threshold is raised, and the ABS allows less wheel slip to allow more driver control. When in 4WD Low range the vehicle height adjusts to 38 mm (1.49 in.) above NRH. The transfer case and the Electronic Limited Slip Differential (ELSD) locks, the transmission shifting and ABS adjusts to off road settings.
5. Rock - Not available in 4WD High range . When in 4WD Low range the vehicle height adjusts to 65 mm (2.6 in.) above NRH. The transfer case and the ELSD locks, the transmission shifting and ABS adjusts to off road settings, and hill descent control is activated for steep downhill control.

DIAGNOSIS AND TESTING - AIR LEAK DETECTION

Always check for DTCs as the first step of an air leak check. Some DTCs can point to a specific area of the vehicle as a starting point. Use a watered down liquid soap and a spray bottle to perform air leak diagnosis. Apply a liberal spray and inspect for air bubbles in the area of concern.

COMPLETE SYSTEM FILL

Note. The air suspension system will auto-disable when lifted on a frame hoist, or when jacking one corner of the vehicle. The air suspension may attempt to change height slightly prior to switching to auto-disable. A manual disable is also available by pressing the "Up" and "Down" switches of the terrain select switch simultaneously for more that 5 seconds. The air suspension system will return to normal operation when the vehicle speed reaches 25 kph (15 mph).

This procedure should only be necessary when the entire system was purged of air, as in a compressor or valve block assembly replacement.

Scheme 46

Note. The gauge (1) on Air Suspension Refill Tool - (special tool #10247, Tool, Air Suspension Refill) reads the tank pressure. The regulator limits the pressure in the line (4) to 12 bar (175 psi). When connected to the reservoir with the valves open, pressure in the reservoir can be read on the scan tool.

The Air Suspension Refill Tool - (special tool #10247, Tool, Air Suspension Refill) (1, 4, 5, 6) is used with a nitrogen supply tank (2, 3) which can be acquired at a local gas supplier. The nitrogen must be Purity Class 5 (99.999% pure) .

Scheme 47

1. Raise and support the vehicle so the suspension system is hanging (four wheels off the ground). Refer to «HOISTING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
2. Make sure the Air Suspension Refill Tool - (special tool #10247, Tool, Air Suspension Refill) line on/off valve (6) is turned off and the nitrogen tank valve is turned off (2). NOTE: With the air suspension reservoir behind the back seat, the fill fitting will always be on the drivers side of the vehicle.
3. Tilt the rear seat forward, and lift the cargo floor beauty panel (removed for clarity) to expose the reservoir (4).
4. Remove the reservoir fill connection cap (not shown in illustration).
5. With Air Suspension Refill Tool - (special tool #10247, Tool, Air Suspension Refill) (1, 2, 5) attached to a nitrogen tank, connect the quick coupler (2) to the air suspension reservoir fill connection (3) and open the valve (1) by turning clockwise.
6. Fill the reservoir to approximately 12 bar (175 psi) by fully opening the valve (2) on the nitrogen tank (3) and the valve (6) on Air Suspension Refill Tool - (special tool #10247, Tool, Air Suspension Refill) (1, 4, 5, 6).
7. When the pressures are equalized, close the valve (6) on the tool.
8. With a scan tool, using the routines under the Air Suspension Control Module (ASCM), perform a Short Fill on one rear air spring, verify that the air spring is seated properly, then perform a Complete Fill on that spring.
9. Repeat step 8 on the opposite rear air spring.
10. Fill the reservoir again by repeating steps 6 and 7.
11. With a scan tool, using the routines under the Air Suspension Control Module (ASCM), perform a Complete Fill on each front spring and shock assembly.
12. Verify the Air Suspension Refill Tool - (special tool #10247, Tool, Air Suspension Refill) line on/off valve (6) is closed and close and the nitrogen tank valve (2).
13. Remove the supports and lower the vehicle.
14. Close the valve (1) by turning counter clockwise, remove the quick coupler (2) from the air suspension reservoir fill connection (3) and install the reservoir fill connection cap (not shown in illustration).
15. With a scan tool, using the routines under the Air Suspension Control Module (ASCM), perform the following: Command the vehicle to Normal Ride Height. Run the Air Mass Calculation routine on the air suspension system. If necessary, add to the system or deflate to atmosphere using the ASCM routines, then repeat the Air Mass Calculation routine again until system responds with Air Mass OK (188 - 216 bar-liters).
16. Perform the ASCM Verification Test. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-air-suspension-control-module-ascm-electrical-diagnostics) .

MANUAL RESERVOIR DEFLATE

Note. The air suspension system will auto-disable when lifted on a frame hoist, or when jacking one corner of the vehicle. The air suspension may attempt to change height slightly prior to switching to auto-disable. A manual disable is also available by pressing the "Up" and "Down" switches of the terrain select switch simultaneously for more that 5 seconds. The air suspension system will return to normal operation when the vehicle speed reaches 25 kph (15 mph).

This procedure should only be necessary when the entire system was purged of air, as in a compressor or valve block assembly replacement.

Note. The gauge (1) on Air Suspension Refill Tool - 10247 reads the tank pressure. The regulator limits the pressure in the line (4) to 12 bar (175 psi). When connected to the reservoir with the valves open, pressure in the reservoir can be read on the scan tool.

The Air Suspension Refill Tool - 10247 (1, 4, 5, 6) is used with a nitrogen supply tank (2, 3) which can be acquired at a local gas supplier. The nitrogen must be Purity Class 5 (99.999% pure) .

Scheme 48

1. Place the ignition in the ON position.
2. Place the air suspension system in Park Mode, and return the ignition to OFF. NOTE: With the air suspension reservoir behind the back seat, the fill fitting will be on the LH side of the vehicle.
3. Tilt the rear seat forward, and lift the cargo floor beauty panel (removed for clarity) to expose the reservoir (4).
4. Remove the reservoir fill connection cap (not shown in illustration).
5. With Air Suspension Refill Tool - 10247, remove the air hose from the quick coupler (2) and connect the quick coupler (2) to the air suspension reservoir fill connection (3) and slowly open the valve (1) by turning clockwise to exhaust the pressure from the reservoir.
6. Raise and support the vehicle so the suspension system is hanging (four wheels off the ground). Refer to «HOISTING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
7. With a scan tool, using the routines under the Air Suspension Control Module (ASCM), deflate the complete system to atmosphere.

Scheme 49

Pressurized air is transferred though air lines (2, 6) between the air suspension compressor assembly (4), air suspension reservoir (1), compressor assembly valve block (part of compressor assembly [4]), front air suspension spring and shock assemblies (3), and the rear air springs (7). The air lines are made of nylon 12. The air lines are broken into two primary groups divided by a connection (5) in the engine compartment at the cowl, and a few individual lines at the air suspension compressor assembly (4). The air lines will have a dedicated harness and will be clipped to or run along with a wiring harness. The complete section from the cowl rearward is serviced as a rear air line assembly (6) including the RR, LR and reservoir (all from the cowl to its component). The lines forward of the cowl connection (2) are serviced as a front air line assembly including the RF, LF, RR to cowl, LF to cowl and reservoir to cowl with a few exceptions at the air suspension compressor assembly as follows

1. Compressor Air Line (pressure, between compressor and valve block)
2. Adapter Air Line (compressor to valve block bracket, for reservoir air line connection)

New lines will come without fittings and should always have new fittings when a line is replaced. When replacing a line only, unscrew the fitting and remove together. When installing, tighten the new fitting on the component to specifications, then push the line fully into the fitting and lock the line into the fitting by pulling on the line. Only when the line is pulled will it be properly secured and sealed. When replacing a component only, remove line and fitting together (do not remove the fitting from the line). Then replace the component and use the original line and fitting.

REPAIRS: Air lines can be repaired for a hole or puncture; however if a section line is damaged, the entire line must be replaced. For line repair, refer to AIR LINE, STANDARD PROCEDURE . A third line repair must not be done on the system. Lines must be replaced after 2 repair splices are in the entire system.

STANDARD PROCEDURE - AIR LINE REPAIR

Note. A maximum of 7 mm (0.275 in.) is allowed between the ends of the air line inside the air suspension union after a repair. If after the damaged area of the air line is removed and the two ends of the air line are more than 7 mm (0.275 in.) apart, the air line must be replaced.

Air lines can be repaired for a hole or puncture? however if a line is cracked or crushed the entire line must be replaced. A third repair must not be done on the system.

Scheme 50

A brass air suspension union (1) comes fully assembled and is intended for use without any disassembly. There are plastic placeholders (2) inserted into the union (1) to keep out moisture/debris and to retain alignment of the line retainer inside the union. Do not remove the plastic placeholders (2) until ready to insert the line for repair. There are two O-rings inside and one O-ring on the threaded area of the nut on both ends of the union (1). Inside the union (1), between the body and the nut is a line retainer that locks the line in place when the line is pushed all the way into the union (1) and then pulled. The pulling action on the air line is what locks the line into place.

Scheme 51

Scheme 52

Scheme 53

1. Raise and support the vehicle. Refer to «HOISTING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
2. With a scan tool, using the routines under the ASCM, perform the following: Disable the air suspension system. Run the Spring Deflate To Reservoir routine on the air suspension spring and shock assembly to be removed OR fro the reservoir air line, raise the vehicle to the highest setting. If the reservoir line is being repaired, deflate reservoir to atmosphere.
3. Access the air line as necessary so that approximately 305 mm (12 in.) of line is accessible around the damaged area.
4. Clean the air line with mild rose water and thoroughly dry. NOTE: Care must be taken when cutting the air line so that no ridge is created on the surface of the air line, and that the air line is not crushed into an oval shape or the air line adapter O-ring will not hold pressure.
5. Using air line cutters, carefully cut the air line on each side (5, 4) of the damaged area (3) removing no more than 7 mm (0.275 in.).
6. Remove one plastic placeholder (2) and insert the air line (3) fully into the union (1).
7. Remove the remaining placeholder (2) and insert the air line (1) fully into the union (3).
8. Grasp the air line on both sides of the union (3) and pull to seat the retainer and properly seal the union and lines.
9. With a scan tool, using the routines under the Air Suspension Control Module (ASCM), perform the following: Fill Spring From Reservoir/Complete Fill (on the spring replaced) OR if the reservoir air line was replaced, command the vehicle to normal ride height. Run the Air Mass Calculation routine on the air suspension system. If necessary, add to the system or deflate to atmosphere using the ASCM routines, then repeat the Air Mass Calculation routine again until system responds with Air Mass OK (188 - 216 bar-liters). Enable the air suspension system.
10. Remove the supports and lower the vehicle.
11. Perform the ASCM Verification Test. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-air-suspension-control-module-ascm-electrical-diagnostics) .

ADAPTER AIR LINE

Scheme 54

Scheme 55

1. With a scan tool, using the routines under the Air Suspension Control Module (ASCM), perform the following: Change the vehicle ride height to the highest level. Raise and support the vehicle. Refer to «HOISTING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) . Deflate the reservoir to atmosphere. Disable the air suspension system.
2. Remove the RF tire and wheel.
3. Remove the RF wheelhouse splash shield. Refer to «SHIELD, SPLASH, WHEELHOUSE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) . NOTE: A small amount of residual air pressure may still be present.
4. Remove the adapter air line/fitting (1) from the back of the compressor (2).
5. Remove the reservoir air line/fitting (1) from the adapter air line connection (6).
6. Remove the adapter air line retainer/routing clips from the valve block bracket and remove the adapter air line from the vehicle.

FRONT AIR LINES

Note. New fittings must be used with new air lines, and new air lines do not include new fittings.

Scheme 56

Scheme 57

Scheme 58

Scheme 59

Scheme 60

Scheme 61

1. Raise and support the vehicle. Refer to «HOISTING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
2. With a scan tool, using the routines under the Air Suspension Control Module (ASCM), perform the following: Deflate the complete system to atmosphere. Disable the air suspension system.
3. Disconnect and isolate the negative battery cable. Refer to «CABLES, BATTERY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/charging-system/#battery-system-service-information) .
4. Remove the RF wheel.
5. Remove the RF wheelhouse splash shield. Refer to «SHIELD, SPLASH, WHEELHOUSE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) . NOTE: The front and rear spring air lines are removed for clarity.
6. Remove the air spring air lines (4) at the valve block (5).
7. Remove the reservoir air line (3) at the air line adapter (2).
8. Remove the routing clip (1) at the harness loom.
9. Lower the vehicle enough to access inside of vehicle.
10. Inside the vehicle, remove the RH instrument panel lower insulator.
11. Pull back the carpet for access to the air line connectors (1, 2). NOTE: The connector locking tabs under the instrument panel are color coded for identification. The reservoir locking tab is black, the RR is green, and the LR is white.
12. Release the locking tabs and disconnect the air lines (1, 2) under the RH side of the IP. NOTE: Pay special attention to the air suspension harness (2) routing between wiring harness (1) and body for proper routing during installation.
13. From the engine compartment, pull the air suspension air line bundle (2) up through the wiring harness (1) to access the bundle in the engine compartment.
14. Remove the cowl extension silencer. Refer to «SILENCER, COWL EXTENSION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
15. Remove the nuts (2) that secure the HVAC air inlet duct (1) to the engine compartment side of the dash panel (3) and remove the duct (1). CAUTION: Only remove the air line fitting (hex portion) and not the Pressure Retention Valve (round portion) of the brass assembly on top of the air suspension spring and shock assembly. Removing and reinstalling the valve (round) part of the assembly may cause a leak.
16. Disconnect the air lines/fittings (1) from both air suspension spring and shock assemblies.
17. From under the hood, remove the air suspension air line bundle from the wiring harness routing clip (1) below the battery positive cable jump post.
18. Remove the LF air line (2) from the routing clip (3) below the battery positive cable jump post. NOTE: Record which color coded air line comes from each grommet hole for proper installation.
19. Pull the air lines (4) through the grommet in the cowl.
20. Remove the LF air line from the seven routing clips behind the engine/cowl heat insulator.
21. Remove the LF air line from the three air line routing clips below and to the left of the brake booster assembly.
22. Pull the brake line (2) toward the fender enough to pull the LF air line (1) from under the brake line (2) and out of the routing bracket (3).
23. Disconnect the master cylinder fluid level switch connector (5) and brake booster vacuum switch electrical connector (4).
24. Move the LF air line (1), air spring assembly side, forward and to the right of the master cylinder for ease of routing behind engine/cowl heat insulator.
25. Remove the front air line bundle from the vehicle by pulling the LF air line (1) from the right side, while feeding from the left side to route the LF air line (1) from under the steering column shaft (not shown in illustration), AC lines (3) and heater hoses (2), and from behind the engine/cowl heat insulator.

PRESSURE AIR LINE

1. Raise and support the vehicle. Refer to «HOISTING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
2. Remove the RF tire and wheel.
3. Remove the RF wheelhouse splash shield. Refer to «SHIELD, SPLASH, WHEELHOUSE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
4. Remove the pressure air line/fitting (3) from the back of the compressor (2). NOTE: Some air lines removed for clarity.
5. Remove the pressure air line/fitting (2) from the face of the valve block (3) and remove the pressure air line from the vehicle.

REAR AIR LINES

Note. New fittings must be used with new air lines, and new air lines do not include new fittings.

Scheme 62

Scheme 63

Scheme 64

1. Raise and support the vehicle. Refer to «HOISTING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
2. With a scan tool, using the routines under the Air Suspension Control Module (ASCM), perform the following: Deflate the complete system to atmosphere. Disable the air suspension system.
3. Disconnect and isolate the negative battery cable. Refer to «CABLES, BATTERY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/charging-system/#battery-system-service-information) .
4. Remove the RH cowl side trim panel. Refer to «PANEL, COWL TRIM, SIDE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
5. Remove the RH instrument panel lower insulator.
6. Pull back the carpet for access to the air lines/connectors.
7. Disconnect the air line connectors (1, 2) under the RH side of the IP (connector lock tab colors - RR is green, LR is white, and the reservoir is black).
8. Remove the lower B-pillar trim panel. Refer to «PANEL, B-PILLAR TRIM, LOWER, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
9. Remove the RF footwell load floor. Refer to «LOAD FLOOR, FOOTWELL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
10. Remove the RR seat. Refer to «SEAT, REAR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
11. Remove the RR door scuff plate. Refer to «PLATE, SCUFF, DOOR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
12. Remove the cargo load floor. Refer to «LOAD FLOOR, CARGO, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
13. Loosen the two screws (3) on the clamps (2) that secure the reservoir (4) just enough to turn the reservoir (4) for access to the air line/fitting (1).
14. Disconnect the air line/fitting (1) from the reservoir (4).
15. Lift the electrical wiring harness from the retainers for access to the air lines.
16. Remove the air lines from the five retainers from the instrument panel to the reservoir.
17. Pull the two rear air spring air lines and grommet loose from the floor.
18. Remove the rear wheels.
19. Remove the rear air lines from the five routing clips. NOTE: Right side shown in illustration, left side similar.
20. Remove air line/fittings (2) from both air springs (1).
21. Feed the rear air lines up through the floor access hole as far as possible for ease of removal from above.
22. Lower the vehicle enough to access the interior.
23. Remove the air lines from inside the vehicle.

Note. New fittings must be used with new air lines, and new air lines do not include new fittings.

Note. Some air lines removed for clarity.

1. Position the adapter air line (6) and connect the adapter air line retainer/routing clips on the valve block bracket.
2. Remove the adapter air line fitting/plug from the adapter air line (6) just before installing the reservoir air line (1).
3. Install the reservoir air line/fitting (1) to the adapter air line connection (6) and tighten to 3.5 N.m (31 in. lbs.).
4. Install a new air line fitting on the compressor and tighten to 3.5 N.m (31 in. lbs.).
5. Remove the adapter air line plug and install the adapter air line into the fitting (1) by pushing the line straight into the fitting until seated, then pull to verify it is seated.
6. Install the RF wheelhouse splash shield. Refer to «SHIELD, SPLASH, WHEELHOUSE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
7. Install the RF tire and wheel. Refer to «WHEELS, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/wheel-tire-system/#tires-wheels-service-information) .
8. Remove the supports and lower the vehicle.
9. With a scan tool, using the routines under the Air Suspension Control Module (ASCM), perform the following: Return the vehicle to Normal Ride Height. Run the Air Mass Calculation routine on the air suspension system. If necessary, add to the system or deflate to atmosphere using the ASCM routines, then repeat the Air Mass Calculation routine again until the system responds with Air Mass OK (188 to 216 bar-liters). Enable the air suspension system.
10. Perform the ASCM Verification Test. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-air-suspension-control-module-ascm-electrical-diagnostics) .

Note. New fittings must be used with new air lines, and new air lines do not include new fittings.

1. Install the front air lines in the vehicle by feeding the LF air line (1) from the right side behind the engine/cowl heat insulator, under the AC lines (3), heater hoses (2), the steering column shaft (not shown in illustration) and up between the engine and master cylinder.
2. Move the LF air line (1) forward and to the left of the master cylinder as originally routed.
3. Connect the master cylinder fluid level switch connector (5) and brake booster vacuum switch electrical connector (4).
4. Pull the brake line (2) toward the fender enough to position the LF air line (1) under the brake line in the routing bracket (3). Make sure the brake line (2) is properly positioned after seating the air line (1).
5. Verify which air line connector (4) goes through each grommet hole for proper connection inside the vehicle. NOTE: With the caps that come on the new air lines still on the air lines, a small amount of rose water can be applied on the tip and outside of the air line connector/tubes to make it easier to push through the grommet. If the caps are not present, do not apply rose water.
6. Position the front air line bundle and push the three air line connectors (4) through the grommet in the cowl. NOTE: The air lines must be connected to all routing clips during installation.
7. Attach the LF air line to the three air line routing clips below and to the left of the brake booster assembly.
8. Attach the LF air line to the seven routing clips behind the engine/cowl heat insulator.
9. Attach the air suspension air line bundle to the wiring harness routing clip (1) below the battery positive cable jump post.
10. Attach the LF air line (2) to the routing clip (3) below the battery positive cable jump post.
11. Route the air suspension air line bundle (2), as removed, down through the wiring harness (1) to the compressor area.
12. Install a new air line fitting (1) on each spring and shock assembly and tighten to 5.5 N•m (49 in. lbs.).
13. Install the air lines to the two front air spring and shock assemblies by pushing the line straight into the fitting (1) until seated, then pulling to verify it is seated.
14. Position the HVAC air inlet duct (1) to the engine compartment side of the dash panel (3), install the two retaining nuts (2) and tighten to 4.5 N.m (40 in. lbs.).
15. Install the cowl extension silencer. Refer to «SILENCER, COWL EXTENSION, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) . NOTE: The connector locking tabs under the instrument panel are color coded for identification. The reservoir locking tab is black, the RR is green, and the LR is white.
16. Inside the vehicle, remove the protective caps and connect the air lines (1, 2) under the RH side of the IP. Make sure the air lines are fully inserted, the locking tabs are seated and the lines will not pull out.
17. Position the carpet as necessary.
18. Install the RH instrument panel lower insulator.
19. Install a new air line fitting on the adapter air line (2) and each of the four air spring air lines (4) on the valve block (5) and tighten to 3.5 N.m (31 in. lbs.). NOTE: The air lines are color coded with tape for identification. Match the tape colored tape to the color on the valve block. NOTE: The front and rear spring air lines are removed for clarity.
20. Remove the protective caps and install the correct air lines to the adapter air line (2) and the four air spring air line positions (4) on the valve block (5) by pushing the line straight into the fitting (4) until seated, then pulling to verify it is seated.
21. Attach the routing clip (1) at the wiring harness loom near the compressor.
22. Install the RF wheelhouse splash shield. Refer to «SHIELD, SPLASH, WHEELHOUSE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
23. Install the RF wheel. Refer to «WHEELS, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/wheel-tire-system/#tires-wheels-service-information) .
24. Connect the negative battery cable. Refer to «CABLES, BATTERY, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/charging-system/#battery-system-service-information) .
25. With a scan tool, under the Air Suspension Control Module (ASCM), and using the (special tool #10247, Tool, Air Suspension Refill), perform the Complete System Fill procedure. Refer to «AIR SUSPENSION, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-suspension-wheel-alignment) .
26. Perform the ASCM Verification Test. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-air-suspension-control-module-ascm-electrical-diagnostics) .

Note. Some air lines removed for clarity.

1. Install a new air line fitting (2) on the valve block (3) and tighten to 3.5 N.m (31 in. lbs.).
2. Position the pressure air line (2) and install to the face of the valve block (3) by pushing the line straight into the fitting until seated, then pull to verify it is seated.
3. Install a new air line fitting on the back of the compressor (2) and tighten to 3.5 N.m (31 in. lbs.).
4. Install the pressure air line to the back of the compressor (2) by pushing the line straight into the fitting until seated, then pull to verify it is seated.
5. Install the RF wheelhouse splash shield. Refer to «SHIELD, SPLASH, WHEELHOUSE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
6. Install the RF tire and wheel. Refer to «WHEELS, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/wheel-tire-system/#tires-wheels-service-information) .
7. Remove the supports and lower the vehicle.
8. With a scan tool, using the routines under the Air Suspension Control Module (ASCM), perform the following: Run the Air Mass Calculation routine on the air suspension system. If necessary, add to the system or deflate to atmosphere using the ASCM routines, then repeat the Air Mass Calculation routine again until the system responds with Air Mass OK (188 to 216 bar-liters).
9. Perform the ASCM Verification Test. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-air-suspension-control-module-ascm-electrical-diagnostics) .

Note. New fittings must be used with new air lines, and new air lines do not include new fittings.

1. From inside the vehicle, feed the LR and RR lines through the access hole making sure they route properly under the vehicle.
2. Seat the air line grommet in the floor.
3. Lift the electrical wiring harness (1) for access, and attach the air lines (2) to the five retainers (3) between the instrument panel and the reservoir.
4. Attach the wiring harness (1) to the retainers. NOTE: New air lines will have a plug at each opening that needs to be removed prior to installing into the fittings. Reuse of the original air lines requires the use of the original fittings that should not be removed from the air line.
5. Install a new fitting on each rear air spring and tighten to 5.5 N•m (49 in. lbs.)
6. Remove the protective caps and install the air lines to both air springs by pushing the line straight into the fitting until seated, then pull to verify it is seated.
7. Install the rear tires and wheels. Refer to «WHEELS, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/wheel-tire-system/#tires-wheels-service-information) .
8. Inside the vehicle route the reservoir air line (1) as when removed.
9. Install a new fitting on the reservoir (4) and tighten to 5.5 N•m (49 in. lbs.).
10. Remove the protective caps and install the air line to the reservoir by pushing the line straight into the fitting until seated, then pull to verify it is seated.
11. Turn the reservoir (4) back to the original position and tighten the two clamping screws (3) that secure the reservoir to 0.9 N•m (8 in. lbs.).
12. Remove the protective caps and connect the air line connectors (1, 2) under the RH side of the IP (connector lock tab colors - RR is green, LR is white, and the reservoir is black).
13. Install the cargo load floor. Refer to «LOAD FLOOR, CARGO, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
14. Install the RF footwell load floor. Refer to «LOAD FLOOR, FOOTWELL, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
15. Position the carpet as necessary.
16. Install the RR door scuff plate. Refer to «PLATE, SCUFF, DOOR, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
17. Install the RR seat. Refer to «SEAT, REAR, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
18. Install the lower B-pillar trim panel. Refer to «PANEL, B-PILLAR TRIM, LOWER, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
19. Install the RH instrument panel lower insulator.
20. Install the RH cowl side trim panel. Refer to «PANEL, COWL TRIM, SIDE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
21. Connect the negative battery cable. Refer to «CABLES, BATTERY, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/charging-system/#battery-system-service-information) .
22. With a scan tool, under the Air Suspension Control Module (ASCM), and using Air Suspension Refill Tool - (special tool #10247, Tool, Air Suspension Refill), perform the Complete System Fill procedure. Refer to «AIR SUSPENSION, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-suspension-wheel-alignment) .

There are two replaceable plastic air suspension reservoir brackets (2) which are attached to the floor under the rear passenger seat to hold the reservoir (4) in position.

The two Air Suspension Reservoir Brackets are attached to the floor to secure the Air Suspension Reservoir. The brackets are hinged so that when the screw attaching the two halves together is disconnected, the top half of the bracket will flip back (open) for repositioning or removal of the air suspension reservoir. With both brackets in the open position, the air suspension reservoir can be lifted and repositioned into the rear half of the brackets without disconnecting the air line.

1. Remove the cargo load floor. Refer to «LOAD FLOOR, CARGO, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
2. Loosen the clamping screw (3) holding the clamps (2) together and lift the top half of the clamps off the reservoir (4) on each side of the vehicle.
3. Without removing air line (1), lift and position the reservoir (4) to the back side of the clamps (2). NOTE: Be careful to make sure retaining clip or screw does not fall into body cavity.
4. Remove the reservoir bracket retaining screw (5).
5. On the side of the repair, lift the side of the reservoir (4) enough to remove the reservoir bracket (2).

1. On the side of the repair, lift the side of the reservoir (4) enough to position the reservoir bracket (2).
2. Install the reservoir bracket retaining screw (5) and tighten to 2.82 N.m (25 in. lbs.).
3. Position the reservoir, flip the brackets into position, and tighten the clamping screws (3) to 0.9 N.m (8 in. lbs.).
4. Install the cargo load floor. Refer to «LOAD FLOOR, CARGO, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .

Scheme 65

The air suspension compressor assembly (5) is located behind the front bumper fascia on the right side, and is bolted to the fascia support and the frame. The air lines, air suspension hose assembly and multiple electrical connectors are attached to the air suspension compressor assembly (5). The compressor itself is suspended from the air suspension compressor assembly mounting bracket (4) by three spring loaded studs to reduce vibration and noise. The valve block (2) is bolted to a mounting bracket (1) that is in turn bolted directly to the top of the air suspension compressor assembly mounting bracket (4). The air suspension compressor (5) can only be replaced as an assembly, however the valve block (2) can be serviced separately.

The compressor (5) cannot refill the reservoir and complete system if all pressure is exhausted as in a compressor assembly or valve block (2) replacement. The system will need to be filled at the reservoir. For complete filling of the air suspension system after a repair. Refer to AIR SUSPENSION, STANDARD PROCEDURE .

The air suspension compressor assembly is made up of two primary components, the compressor and the valve block. There is a single pressurized air line between the compressor and the valve block to maintain system pressure. Control of the air compressor and valve block is from the Air Suspension Control Module (ASCM). Diagnose the air suspension system using a scan tool.

Air Compressor

The compressor runs to maintain air pressure any time the vehicle height is being changed or in the event of a small reduction in over all system pressure. Integrated reversing valves in the air compressor allow pressurized air to be moved in two directions, making this a closed system. There is a desiccant located inside the compressor for moisture protection, and an air suspension hose assembly attached to the air compressor with a discharge hose and an intake hose (including a filter) which are not pressurized, and can be replaced as an assembly. If water is visible in the filter, the air suspension hose assembly and the valve block must be replaced . An air suspension temperature sensor is attached to the air compressor bracket to monitor ambient air temperature for protection of the compressor.

Positive voltage is from a 40-amp fuse located in the PDC, and a normally open compressor relay (ASCM controlled) located in engine compartment area, and ground for the relay and compressor are through a bolted on eyelet connection.

Valve Block

The valve block controls the flow of air in the system and to maintain the pressure in the in each air spring which allows the system to move each corner of the vehicle up or down as necessary. Valves and solenoids in the valve body increase or release pressure to air lines that connect to each pressurized component. The ASCM determines pressure from an internal pressure sensor in the valve body. The air lines connected to the valve block are labeled for individual replacement.

Scheme 66

Scheme 67

Scheme 68

1. Perform the Manual Reservoir Deflate procedure. Refer to «AIR SUSPENSION, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-suspension-wheel-alignment) .
2. Disconnect and isolate the negative battery cable. Refer to «CABLES, BATTERY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/charging-system/#battery-system-service-information) .
3. Remove the RF tire and wheel.
4. Remove the RF wheel splash shield. Refer to «SHIELD, SPLASH, WHEELHOUSE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
5. Remove the front fascia. Refer to «FASCIA, FRONT, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) .
6. Disconnect the filter retaining clip (2) and the hoses (3) from the routing clips (4).
7. Disconnect the valve block wiring harness connector (2) and the wiring harness retaining clip (1).
8. Remove the compressor to bumper bracket nuts (4).
9. Disconnect the compressor wiring harness connector (3). NOTE: Only the RR, LR, LR, LF air line/fittings need to be removed from the valve block. NOTE: Do not remove the fitting from the air lines. Original fittings must be used when using the original air lines.
10. Remove the four air spring line/fittings (2), from the valve block.
11. Remove the reservoir line/fitting (1) from the adapter (above the valve block).
12. Remove the compressor to frame nut (4), and remove the compressor from the vehicle.

1. Position the air suspension compressor assembly, install the compressor to frame nut and tighten to 24 N.m (18 ft. lbs.).
2. Remove all air line fittings from the compressor assembly.
3. Install the reservoir line/fitting (1) to the adapter (above the valve block) and tighten to 3.5 N.m (31 in. lbs.).
4. Install the four air spring line/fittings (2), to the valve block and tighten to 3.5 N.m (31 in. lbs.).
5. Connect the compressor wiring harness connector (3).
6. Connect the valve block wiring harness connector (2) and the wiring harness retaining clip (1).
7. Install the compressor to bumper bracket nuts (4) and tighten to 24 N.m (18 ft. lbs.).
8. Connect the filter retaining clip (2) and the hoses (3) to the routing clips (4).
9. Install the front fascia. Refer to «FASCIA, FRONT, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) .
10. Install the RF wheel splash shield. Refer to «SHIELD, SPLASH, WHEELHOUSE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
11. Install the RF tire and wheel. Refer to «WHEELS, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/wheel-tire-system/#tires-wheels-service-information) .
12. Connect the negative battery cable. Refer to «CABLES, BATTERY, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/charging-system/#battery-system-service-information) .
13. With a scan tool, under the Air Suspension Control Module (ASCM), and using Air Suspension Refill Tool - (special tool #10247, Tool, Air Suspension Refill), perform the Complete System Fill procedure. Refer to «AIR SUSPENSION, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-suspension-wheel-alignment) .
14. Perform the ASCM Verification Test. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-air-suspension-control-module-ascm-electrical-diagnostics) .

Scheme 69

The air suspension hose assembly is between the body and the RF wheelhouse splash shield, connecting to the air suspension compressor assembly. The hose assembly consists of two hoses, a suction (air intake) hose (4) and an air exhaust hose (1) (labeled OUT on the valve block) for the air compressor. The suction hose (4) incorporates a filter assembly (2) for filtering the incoming air for the compressor. If water is visible inside the filter assembly (2), the air suspension hose assembly and the valve block must both be replaced. The filter assembly (2) is not serviceable alone. The air suspension hose assembly can be serviced as one component, however if the air suspension compressor assembly is replaced, the air suspension hose assembly will also be supplied.

Note. If the filter has any sign of water, or the suction hose to the back of the compressor has a leak, the valve block must also be replaced. Refer to VALVE BLOCK, COMPRESSOR ASSEMBLY, REMOVAL .

Scheme 70

1. Raise and support the vehicle. Refer to «HOISTING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
2. Remove the RF tire and wheel.
3. Remove the RF wheel splash shield. Refer to «SHIELD, SPLASH, WHEELHOUSE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) . NOTE: Pay particular attention to the routing of the hoses. There can be no twisting or kinking of the hoses when reassembled.
4. Disconnect the filter retaining clip (2) from the body, and the hoses (3) from the routing clips (4). NOTE: Compressor assembly removed for clarity.
5. Disconnect the suction hose (4) from the back of the air compressor (3) by using a small flat blade screwdriver (1), or equivalent, and prying the ring (2) at the base of the elbow toward the compressor (3) and pulling out on the elbow (4) of the hose.
6. Remove the suction hose routing clip (not shown in illustration) from the bracket. NOTE: Air spring lines removed for clarity.
7. Disconnect the OUT hose (5) from the valve block (3) and remove the air suspension hose assembly from the vehicle.

1. Position the air suspension hose assembly in the vehicle.
2. Attach the OUT hose (5) to the valve block (3) with the spring clamp.
3. Connect the suction hose elbow (4) to the compressor (3) by pushing over the fitting. Pull the elbow (4) to verify it is locked into place. NOTE: Before and while connecting the retaining clips, verify there is no twists or kinks in the hoses.
4. Connect the filter retaining clip (2) to the body, and the hoses (3) to the routing clips (4).
5. Install the RF wheel splash shield. Refer to «SHIELD, SPLASH, WHEELHOUSE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
6. Install the RF tire and wheel. Refer to «WHEELS, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/wheel-tire-system/#tires-wheels-service-information) .
7. Remove the support and lower the vehicle.

The air suspension reservoir (4) is located behind rear passenger seat under a folding panel and is nearly the full width of the inside of the vehicle. There is an air valve connection for initial filling or complete system filling, and an air line (1) connected to it which is part of the rear air line assembly. The reservoir is secured to the floor with two brackets (2). The brackets are hinged so that when the screw attaching the two halves together is disconnected, the top half of the bracket will flip back (open) for repositioning or removal of the air suspension reservoir.

Note. LHD vehicles will have the air line/fitting on the RH side of the vehicle. RHD vehicles will have the air line/fitting on the LH side of the vehicle.

Because the air suspension system is a closed system an air suspension reservoir is required to store a specified volume of pressurized air for use when the system need to raise or lower the vehicle height. If an individual pressurized component of the air suspension system is damaged and air pressure is lost, the reservoir will hold any pressure left in the component when a scan tool is used to evacuate the component. After repair or replacement of the component a scan tool can be used to refill the component from the reservoir.

The compressor cannot refill the reservoir and complete system if all pressure is exhausted as in a compressor assembly or valve block replacement. The system will need to be filled at the reservoir using shop air. For filling the reservoir after a repair. Refer to AIR SUSPENSION, STANDARD PROCEDURE .

1. With a scan tool, using the routines under the Air Suspension Control Module (ASCM), perform the following: Change the vehicle ride height to the highest level. Deflate the reservoir to atmosphere. Disable the air suspension system.
2. Remove the cargo load floor. Refer to «LOAD FLOOR, CARGO, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
3. Loosen the clamping screw (3) holding the clamps (2) together and lift the top half of the clamps off the reservoir (4) on each side of the vehicle. NOTE: LHD vehicles will have the air line/fitting on the RH side of the vehicle. RHD vehicles will have the air line/fitting on the LH side of the vehicle. NOTE: The reservoir will need to be twisted to remove the air line. Note the position of the air line before twisting for proper installation.
4. Disconnect the air line/fitting (1) from the reservoir (3).
5. Remove the reservoir (4) from the vehicle.

1. Position the reservoir (4), connect the air line/fitting (1) and tighten to 4 N.m (36 in. lbs.). NOTE: Before tightening the clamping screws (3), the reservoir (4) will need to be placed in the same position as noted on removal.
2. Position the holding the clamps (2) together on the reservoir (4) and tighten the clamping screw (3) to 0.9 N.m (8 in. lbs.).
3. Connect the air line/fitting (1) to the reservoir (3).
4. Install the cargo load floor. Refer to «LOAD FLOOR, CARGO, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
5. With a scan tool, using the routines under the Air Suspension Control Module (ASCM), perform the following: Change the ride height to Normal. Run the Air Mass Calculation routine on the air suspension system. If necessary, add to the system or deflate to atmosphere using the ASCM routines, then repeat the Air Mass Calculation routine again until system responds with Air Mass OK (188 - 216 bar-liters). Enable the air suspension system.
6. Perform the ASCM Verification Test. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-air-suspension-control-module-ascm-electrical-diagnostics) .

The air suspension temperature sensor (3) has an attached electrical harness (5) with connector and is attached to the valve block bracket (4) by a single screw (6).

The air suspension temperature sensor is wired to the Air Suspension Control Module (ASCM) with two wires, a signal wire and return wire. The sensor signals the ASCM of the ambient temperature in the area of the air compressor for protection against overheating.

Note. Fascia removed for clarity.

1. Raise and support the vehicle. Refer to «HOISTING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
2. Remove the RF tire and wheel.
3. Remove the RF wheel splash shield. Refer to «SHIELD, SPLASH, WHEELHOUSE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
4. Remove the RF fog lamp. Refer to «LAMP, FOG, FRONT, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/exterior-lights/#lampslighting-exterior-service-information) .
5. Remove the fog lamp trim bezel from the fascia for access.
6. Disconnect the air suspension temperature sensor wiring harness electrical connector (5).
7. Remove the air suspension temperature sensor retaining screw (6) and remove the sensor (3).
8. Remove the push nut for the retaining screw from the bracket (not shown in illustration).

1. Install the push nut for the retaining screw from the bracket (not shown in illustration).
2. Position the air suspension temperature sensor (3), install the retainer screw (6) and tighten to 4 N•m (36 in. lbs.).
3. Connect the air suspension temperature sensor wiring harness electrical connector (5).
4. Install the fog lamp trim bezel to the fascia.
5. Install the RF fog lamp. Refer to «LAMP, FOG, FRONT, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/exterior-lights/#lampslighting-exterior-service-information) .
6. Install the RF wheel splash shield. Refer to «SHIELD, SPLASH, WHEELHOUSE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
7. Install the RF tire and wheel. Refer to «WHEELS, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/wheel-tire-system/#tires-wheels-service-information) .
8. Perform the ASCM Verification Test. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-air-suspension-control-module-ascm-electrical-diagnostics) .

If equipped with an air suspension system, there are height sensors located on each corner of the vehicle. If not equipped with air suspension, but is equipped with headlamp leveling, only the RF and RR height sensors are used.

Scheme 71

The front height sensors (2) are located in the front wheel well areas. The sensors are attached to the body, and a rod from the sensor is connected to the upper control arm. There is also a three wire electrical connection (4) on the sensor.

Scheme 72

Note. When installing the rear height sensors, both the right and left height sensors MUST have their sensor lever arms pointed toward the outboard side of the vehicle before the height sensor bracket to lower control arm retaining screw (5) is secured to the lower control arm (6).

The rear height sensors (3) are located near the rear air spring (1). The sensors are attached to the cradle, and a rod from the sensor is connected to the lower control arm (6). There is also a three wire electrical connection (4) on the sensor.

If equipped with an air suspension system, the height sensors are wired directly to the Air Suspension Control Module (ASCM) where information is used to determine and control vehicle height. The ASCM then transmits the information on the CAN bus where it is used by the Auto Headlamp Leveling Module (AHLM). If not equipped with air suspension, but is equipped with headlamp leveling, the sensors are wired directly to the AHLM. The sensors have three wired circuits for height sensor power, signal and return.

Scheme 73

Note. The spring and knuckle are removed for clarity. Right sensor shown in illustration, left sensor similar.

1. With a scan tool, using the routines under the Air Suspension Control Module (ASCM), disable the air suspension system.
2. Raise and support the vehicle. Refer to «HOISTING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
3. Disconnect the wire harness connector from the height sensor.
4. Carefully unsnap the upper end of the height sensor link from the ball stud (3) of the upper control arm (4) with a small screwdriver.
5. Remove the two retaining nuts (1) that secure the height sensor mounting bracket (2).
6. Remove the height sensor, bracket and link (2) from the vehicle.

REAR

Scheme 74

Note. Some components are removed for clarity. Left sensor shown in illustration, right sensor similar.

1. With a scan tool, using the routines under the Air Suspension Control Module (ASCM), disable the air suspension system.
2. Raise and support the vehicle. Refer to «HOISTING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
3. Disconnect the wire harness connector from the height sensor (3).
4. Remove the height sensor bracket to lower control arm retaining screw (6).
5. Remove the two height sensor to cradle retaining screws (2).
6. Remove the rear height sensor, bracket and link from the vehicle.

Note. The spring and knuckle are removed for clarity. Right sensor shown in illustration, left sensor similar.

1. Position the height sensor, brackets and link (2) on the two studs.
2. Install the two height sensor retaining nuts (1) and tighten to 5 N.m (44 in. lbs.).
3. Align the height sensor link with the ball stud (3) on the upper control arm (4). Press the link socket over the ball stud until it snaps into position.
4. Connect the wire harness connector to the height sensor.
5. Remove the supports and lower the vehicle.
6. Perform the Curb Height Measurement to get values for input to the scan tool in the next step. Refer to «WHEEL ALIGNMENT, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-suspension-wheel-alignment) . NOTE: Make sure the scan tool preferences are set to metric. When writing the measured values to the Air Suspension Control Module (ASCM) they will need to be in millimeters.
7. With a scan tool, using the routines under the ASCM, perform the following: Perform the Curb Height Measurement and record the values for input to the scan tool. Refer to «WHEEL ALIGNMENT, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-suspension-wheel-alignment) . Perform the Write Suspension Height Values routine and input measurements recorded as prompted by scan tool. Command the vehicle to Normal Ride Height (NRH) again. Perform the Curb Height Measurement again and verify specifications. Refer to «WHEEL ALIGNMENT, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-suspension-wheel-alignment) . Run the Air Mass Calculation routine on the air suspension system. If necessary, add to the system or deflate to atmosphere using the ASCM routines, then repeat the Air Mass Calculation routine again until the system responds with Air Mass OK (188 to 216 bar-liters). Run the Height Sensor Check routine on the air suspension system. Enable the air suspension system.
8. Perform the ASCM VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-air-suspension-control-module-ascm-electrical-diagnostics) .

Note. Some components are removed for clarity. Left sensor shown in illustration, right sensor similar.

1. Position the height sensor, bracket and link (3) to the cradle (1).
2. Install the two height sensor to cradle retaining screws (2) and tighten to 6 N.m (53 in. lbs.). NOTE: Both the right and left height sensors MUST have their sensor lever arms (4) pointed toward the outboard side of the vehicle before the height sensor bracket to lower control arm retaining screw (6) is secured to the lower control arm (5).
3. Position the height sensor bracket to the lower control arm (5) with the locator tab of the bracket into the locator hole in the control arm (5).
4. Install the height sensor bracket to lower control arm retaining screw (6) and tighten to 6 N.m (53 in. lbs.).
5. Connect the wire harness connector to the height sensor.
6. Remove the supports and lower the vehicle.
7. Perform the Curb Height Measurement to get values for input to the scan tool in the next step. Refer to «WHEEL ALIGNMENT, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-suspension-wheel-alignment) . NOTE: Make sure the scan tool preferences are set to metric. When writing the measured values to the Air Suspension Control Module (ASCM) they will need to be in millimeters.
8. With a scan tool, using the routines under the ASCM, perform the following: Perform the Curb Height Measurement and record the values for input to the scan tool. Refer to «WHEEL ALIGNMENT, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-suspension-wheel-alignment) . Perform the Write Suspension Height Values routine and input measurements recorded as prompted by scan tool. Command the vehicle to Normal Ride Height (NRH) again. Perform the Curb Height Measurement again and verify specifications. Refer to «WHEEL ALIGNMENT, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-suspension-wheel-alignment) . Run the Air Mass Calculation routine on the air suspension system. If necessary, add to the system or deflate to atmosphere using the ASCM routines, then repeat the Air Mass Calculation routine again until the system responds with Air Mass OK (188 to 216 bar-liters). Run the Height Sensor Check routine on the air suspension system. Enable the air suspension system.
9. Perform the ASCM VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-air-suspension-control-module-ascm-electrical-diagnostics) .

The air suspension spring and shock assembly (2) replaces the coil over spring on the front of the vehicle. The air suspension spring and shock assembly incorporates the air spring, shock, mounting brackets, and an air fitting for the air line. Service for the air suspension spring and shock assembly is as a complete assembly. For replacement procedures, refer to SHOCK ABSORBER, SUSPENSION, REMOVAL and SHOCK ABSORBER, SUSPENSION, INSTALLATION .

The air suspension spring and shock assembly works the same as a coil over shock with the exception of an air bag replacing the spring to adjust vehicle height, depending on driving conditions and driver input. An air line is attached to the air suspension spring and shock assembly on the top. For replacement procedures, refer to SHOCK ABSORBER, SUSPENSION, REMOVAL and SHOCK ABSORBER, SUSPENSION, INSTALLATION .

Scheme 75

The air suspension spring (2) replaces the conventional rear coil spring and is an air spring without any metal coil at all. The air spring incorporates an air fitting for the air line. For more information on the air suspension system, refer to AIR SUSPENSION, DESCRIPTION and AIR SUSPENSION, OPERATION .

For removal and installation procedures, refer to SPRING(S), REMOVAL and SPRING(S), INSTALLATION .

The air suspension spring replaces the rear spring on vehicles equipped with air suspension. The air suspension spring adjusts vehicle height, depending on driving conditions and driver input. For more information on the air suspension system, refer to AIR SUSPENSION, DESCRIPTION . Refer to AIR SUSPENSION, OPERATION .

For removal and installation procedures, refer to SPRING(S), REMOVAL and SPRING(S), INSTALLATION .

The terrain select switch is located on the center console and has a rotating selection knob in the center (10), and manual push button switches (1, 2, 8, 9) in the corners with LED indicators. For replacement of the terrain select switch, refer to SWITCH, TERRAIN SELECT, REMOVAL .

The various switch positions are as follows

1. Hill Decent Control (1).
2. 4WD Low (2).
3. Sport Terrain position (3).
4. Snow Terrain position (4).
5. Auto Terrain position (5).
6. Sand/Mud Terrain position (6).
7. Rock Terrain position (7).
8. Air Suspension Up (8).
9. Air Suspension Down (9).
10. Terrain auto select control knob (10).
11. Neutral Position (11).

The terrain select switch is used to communicate driver commands of various vehicle control systems related to vehicle ride height, traction, and stability control. The switch includes an Auto setting and a Neutral setting. The switch communicates with the Cabin Compartment Node (CCN) via a LIN Bus. The CCN sends information related to the terrain select switch via the CAN Interior bus. Some modules that use the information from the terrain select switch are as follows

1. Air Suspension Control Module (ASCM)
2. Antilock Brake Module (ABS)
3. Automatic Headlamp Leveling Module (AHLM)
4. Drivetrain Control Module (DTCM)
5. Powertrain Control Module (PCM)
6. Steering Control Module (SCM)

The valve block (3) is attached to its bracket and then mounted on the air suspension compressor bracket which is located behind the front bumper fascia on the right side, and is bolted to the fascia support and the frame. A new valve block (3) will be supplied with the attaching screws (4) and all necessary air line connector fittings. It can be replaced independent from the air suspension compressor assembly, although if the air compressor assembly is replaced, it will also come with a new valve block (3) attached. If water is visible in the filter located in the air suspension hose assembly, the air suspension hose assembly and the valve block (3) must be replaced. When replacing a valve block (3) independently, do not detach the valve block bracket from the compressor bracket. The air lines connected to the valve block are labeled for identification during replacement.

The valve block mechanically controls the flow of air in the system and maintains the pressure in the reservoir, and in each air spring individually. Valves and solenoids in the valve body open and close to increase or reduce pressure to air lines that connect to each pressurized component allowing the system to move each corner of the vehicle up or down as necessary. All wiring connected to the valve block is directly from the Air Suspension Control Module (ASCM) which fully controls the valve body. The ASCM determines pressure from an internal pressure sensor in the valve body.

Note. Fascia removed for clarity.

Scheme 76

1. Place the ignition in the ON position.
2. Place the air suspension system in Park Mode, and return the ignition to OFF.
3. With a scan tool, using the routines under the Air Suspension Control Module (ASCM), perform the following: Run the Spring Deflate To Atmosphere routine on each of the four springs. When in the Spring Deflate to Atmosphere menu, choose to "completely" deflate for each of the four springs. Disable the air suspension system.
4. Disconnect and isolate the negative battery cable. Refer to «CABLES, BATTERY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/charging-system/#battery-system-service-information) .
5. Raise and support the vehicle. Refer to «HOISTING, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) .
6. Remove the RF tire and wheel.
7. Remove the RF wheel splash shield. Refer to «SHIELD, SPLASH, WHEELHOUSE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
8. Disconnect the valve block wiring harness connector (2). NOTE: Some lines removed for clarity. NOTE: A small amount of residual air pressure may still be present.
9. Remove the five line/fittings (2), and the hose (5) from the face of the valve block.
10. Remove the valve block retaining screws (2) and remove the valve block (1).

1. Position the valve block (1), install the valve block retaining screws (2) and tighten to 4 N•m (36 in. lbs.).
2. Install the hose (5) and the five line/fittings (2) to the face of the valve block and tighten the fittings to 3.5 N•m (31 in. lbs.). NOTE: Fascia removed for clarity.
3. Connect the valve block wiring harness connector (2).
4. Install the RF wheel splash shield. Refer to «SHIELD, SPLASH, WHEELHOUSE, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
5. Install the RF tire and wheel. Refer to «WHEELS, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/wheel-tire-system/#tires-wheels-service-information) .
6. Connect the negative battery cable. Refer to «CABLES, BATTERY, INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/charging-system/#battery-system-service-information) .
7. With a scan tool, and using Air Suspension Refill Tool - (special tool #10247, Tool, Air Suspension Refill), perform the Complete System Fill procedure. Refer to «AIR SUSPENSION, STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-suspension-wheel-alignment) .
8. With a scan tool, using the routines under the Air Suspension Control Module (ASCM), perform the following: Run the Air Mass Calculation routine on the air suspension system. If necessary, add to the system or deflate to atmosphere using the ASCM routines, then repeat the Air Mass Calculation routine again until system is Normal. Enable the air suspension system.
9. Perform the ASCM Verification Test. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/suspension-front/#front-air-suspension-control-module-ascm-electrical-diagnostics) .

See also:
• CLOCKSPRING, STANDARD PROCEDURE
• JACKING AND HOISTING LIFT POINTS
• WHEELS, STANDARD PROCEDURE
• STANDARD PROCEDURE
• COVER, COWL PANEL, REMOVAL
• WHEEL INSTALLATION
• ROTOR, BRAKE, REMOVAL
• REMOVAL
• PLATE, SKID, FRONT, REMOVAL
• CABLES, BATTERY, REMOVAL
• LAMP, FOG, FRONT, REMOVAL
• SPRING(S), REMOVAL
• SWITCH, TERRAIN SELECT, REMOVAL
• WHEEL ALIGNMENT, SPECIFICATIONS
• KNUCKLE, STEERING, REMOVAL
• WITH AIR SUSPENSION (SER)