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Active Body Height Control (AHC) – Part 2

Active Body Height Control (AHC) - Part 2 1
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The principle of the system

1. Normal state, traffic by straight.

High pressure in gas chambers and shock absorbers is supported by closed control valves.

Open bypass valves link right and left shock absorbers.

High pressure in gas chambers and shock absorbers is supported by closed control valves. The bypass valves are closed, the hydraulic circuit of the right and left shock absorbers are not connected. The stiffness of the shock absorbers is adjustable depending on road conditions and the position of the steering wheel..

Active Body Height Control (AHC) - Part 2 2
1 – tank,
2 – pressure sensor,
3 – check valve,
4 – accumulator solenoid valve,
5 – ANS hydraulic accumulator,
6 – drive system AHC (gas chamber),
7 – control valve,
8 – bypass valve,
9 – shock absorbers,
10 – pump damper,
11 – pump system AHC.

3. Increase heights location bodywork.

After pressing the “UP” button, the electric pump turns on.

1) The car is stationary.

The accumulator solenoid valve is open, additional fluid enters the line and increases the rate of lift of the body. The front and rear control valves simultaneously open, passing fluid to the gas chambers and shock absorbers, while raising the front and rear of the body. If the accumulated fluid in the accumulator runs out, the front and rear control valves open alternately, lifting the front and rear of the body separately.

2) The car is moving.

At speeds less than 25 km / h, the accumulator fluid is used in the same way as on a stationary vehicle.

At a speed of more than 25 km / h, only that fluid that is pumped by the pump is used to lift the body. The front and rear control valves open alternately, lifting the front and rear of the body separately.

If the body is in the “LO” position, then at a speed of more than 5 km / h, the hydraulic accumulator is connected to the hydraulic circuit to automatically raise the body to its normal position.

Active Body Height Control (AHC) - Part 2 3

4. Filing liquids in accumulator the system ANS.

Under normal conditions, the accumulator contains such a quantity of fluid that is necessary for a single lifting of the body. After lifting the body from the position “LO” to “N” or from “N” to “HI”, the accumulator must be filled.

During filling, the control valves are closed, the accumulator solenoid valve is open, and fluid is pumped into the battery by the pump. If you need to raise the body before the necessary pressure of the working fluid is created in the accumulator, then only the fluid pumped by the pump will be used for this.

Active Body Height Control (AHC) - Part 2 4

1) Speed ​​less than 5 km / h.

When the AHC mode switch is set to “LO” from N ”or“ N ”from HI”, the front and rear control valves open simultaneously, and fluid from the gas chambers and shock absorbers is discharged into the tank,

lowering the front and rear of the body together.

If the rear part falls faster than expected due to significant loading and there is a significant difference between the speed of movement of the front and rear parts of the body, the rear control valve closes, allowing only the front part to be lowered. This is to prevent the headlights from rising too much..

2) Speed ​​more than 5 km / h.

When the AHC mode switch is set to “N” from HI, the front and rear control valves open alternately, lowering the front and rear of the body separately.

When the speed is more than 5 km / h, the body cannot be moved from position “N” to position “LO”.

Active Body Height Control (AHC) - Part 2 5

Main system malfunctions

Search and troubleshooting of problems arising in the ANS system should begin with the simplest operations and continue in order of increasing complexity. The following describes system malfunctions and troubleshooting procedures..

The indicator that does not correspond to the selected mode of operation of the ANS system is on.

1. Make sure that the “ANS OFF” switch is not pressed.

2. Read trouble codes.

3. Test in test mode (input signal).

Body height control system does not work.

1. Check the power circuit of the ANS control unit.

2. Make sure that there are no conditions under which the system may be prohibited (driving on rough roads, locking differentials, etc.).

3. Check the indicators.

4. Read trouble codes.

5. Test the ANS system in test mode.

6. Test in test mode (input signal).

7. If the above checks did not reveal a malfunction, then replace the ANS system control unit.

Vehicle height does not change when switching “N”“HI”.

1. Make sure that the vehicle load does not exceed the set value.

2. A malfunction may occur when installing additional elements with significant weight on the vehicle (for example, a winch).

3. Verify that the fluid level is normal..

4. Read trouble codes.

5. Test in test mode (input signal).

6. Check shock absorbers.

7. Check the height of the car body (sensor rod length).

The car body does not fall when the system is switched to the “LO” position.

1. A malfunction may occur if the vehicle weight is less than the nominal value.

2. Make sure that shock absorbers and springs are not obstructed by foreign objects..

3. Read trouble codes.

4. Test in test mode (input signal).

5. Check shock absorbers.

6. Check the height of the car body (sensor rod length).

The car body position is very low during parking.

Attention: The body may fall if the ambient temperature has changed significantly while the vehicle is parked..

1. Check for leaks in gas chambers, shock absorbers, etc..

2. If no leaks were found, replace the control valve block.

Car rolls to left or right side.

1. Make sure that there is no overload on one side of the car.

2. Read trouble codes.

3. Adjust the height of the body.

4. Check shock absorbers.

5. Check control valve block (bypass valves).

6. Ensure that fluid flows freely throughout the hydraulic circuit.

Body lift takes place in excess of the standard value.

Attention: if the air temperature is below -15°C and the accumulator has not yet been charged, then the sys-

topics take more time.

1. Make sure that the vehicle load does not exceed the set value.

2. A malfunction may occur if the vehicle weight is less than the nominal value.

3. Read trouble codes.

4. Check shock absorbers.

5. Check the height of the vehicle body (sensor rod length).

6. Check for pressure in the hydraulic accumulator of the ANS system.

7. If the above checks did not reveal a malfunction, then replace the electric pump.

The body drops for a time exceeding the standard value.

Attention: at air temperature below -15°With the system takes more time.

1. A malfunction may occur if the vehicle weight is less than the nominal value.

2. Check shock absorbers.

3. Check the height of the car body (sensor rod length).

4. If the above checks did not reveal a malfunction, replace the block of control valves.

Car leans forward or backward..

1. Make sure that the “ANS OFF” switch is not pressed.

2. Check for leaks in gas chambers, shock absorbers, etc..

3. Read trouble codes.

4. Check the height of the vehicle body (sensor rod length).

5. If the above checks did not reveal a malfunction, then replace the block of control valves.

Excessive system noise.

1. Ensure that fluid flows freely throughout the hydraulic circuit.

2. Make sure there is no play in the electric pump drive.

3. If the hydraulic circuit and pump are normal, replace the pump damper..

Different roll of the car when turning left and right.

1. Make sure that there is no overload on one side of the car.

2. Check the power circuit of the ANC control unit.

3. Read trouble codes.

4. Test in test mode (input signal).

5. Make sure there are no leaks in the gas chambers (check the change in the level of the working fluid in the tank when switching modes from “LO” to “HI” – the level difference must exceed 7 divisions on the tank scale).

6. If the above checks did not reveal a malfunction, then replace the ANS drive or shock absorber.

Significant “pecks” of the car when braking and starting to move.

1. Check the power circuit of the ANS control unit.

2. Read trouble codes.

3. Test in test mode (input signal).

4. If the above checks did not reveal a malfunction, then replace the ANS drive or shock absorber.

It is not possible to carry out a diagnostic check of the ANS system.

1. Check the “ANS OFF” indicator circuit.

2. Check the terminal circuit “TC” of the diagnostic connector.

3. Check the power circuit of the ANS control unit.

Unable to test in test mode (input signal).

1. Check the “TS” terminal circuit of the diagnostic connector.

2. Check the power circuit of the ANC control unit.

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