Ride Height Sensor: Service and Repair

HEIGHT CONTROL SENSOR

Components:

REMOVAL
1. REMOVE FRONT HEIGHT CONTROL SENSOR SUB ASSEMBLY
a. Remove the front wheel.
Torque: 131 Nm (1,340 kgf-cm, 97 ft. lbs.)
b. Disconnect the connector.

c. Remove the front height control sensor.
1. Place matchmarks on the height control sensor link and front upper suspension arm.
2. Remove the nut and disconnect the height control sensor link.
Torque: 5.6 Nm (57 kgf-cm, 49 inch lbs.)
3. Remove the 2 bolts and height control sensor.
Torque: 28 Nm (285 kgf-cm, 21 ft. lbs.)
2. REMOVE REAR HEIGHT CONTROL SENSOR SUB ASSEMBLY
a. Remove the rear wheel.
Torque: 131 Nm (1,340 kgf-cm, 97 ft. lbs.)
b. Disconnect the connector.

c. Remove the rear height control sensor.
1. Place matchmarks on the height control sensor link and rear upper control arm.
2. Remove the nut and disconnect the height control sensor link from the rear upper arm.
Torque: 5.6 Nm (57 kgf-cm, 49 inch lbs.)
3. Remove the 2 bolts and height control sensor.
Torque: 28 Nm (285 kgf-cm, 21 ft. lbs.)

INSPECTION

1. INSPECT FRONT HEIGHT CONTROL SENSOR SUB ASSEMBLY

a. Disconnect the height control sensor connector.
b. Remove the height control sensor.
c. Connect 3 dry batteries of 1.5 V in series.
d. Connect terminal 2 to the batteries' positive terminal, and terminal 3 to the batteries' negative terminal, then apply voltage about 4.5 V between terminals 2 and 3.

Standard Voltage:

e. Measure the voltage between terminals 1 and 3, when the height control sensor link is slowly moved up and down.

2. INSPECT REAR HEIGHT CONTROL SENSOR SUB ASSEMBLY

a. Disconnect the height control sensor connector.
b. Remove the height control sensor.
c. Connect 3 dry batteries of 1.5 V in series.
d. Connect terminal 1 to the batteries' positive terminal, and terminal 3 to the batteries' negative terminal, then apply voltage about 4.5 V between terminals 2 and 3.

Standard Voltage:

e. Measure the voltage between terminals 2 and 3, when the height control sensor link is slowly moved up and down.

ADJUSTMENT

1. ADJUST HEIGHT CONTROL SENSOR (IN CASE OF USING INTELLIGENT TESTER)
a. Connect the intelligent tester to DLC3 on the vehicle.
b. Start the engine and push the height control select switch to adjust the vehicle height to the LO then to N position.

c. Inspect the vehicle height.

Vehicle Height:

Measuring points:
A: Ground clearance of spindle center
B: Ground clearance of lower suspension arm front bolt center
C: Ground clearance of rear axle shaft center
D: Ground clearance of lower control arm front bolt center
d. Inspect and adjust the height control sensor to the neutral position.
1. Read the value of height control sensor on the intelligent tester.
Standard value: Actual vehicle height ± 5 mm (0.20 inch)

HINT: (Example) When the measurement value of the front vehicle height is 85.0 mm (3.35 inch), the actual value of height control sensor is -2.3 mm (-0.09 inch).

2. Loosen the nut and adjust the positions of the height control sensor link and front upper suspension arm or rear lower control arm by moving them up and down to install them.
3. Tighten the nut.
Torque: 5.6 Nm (57 kgf-cm, 49 inch lbs.)

4. When adjustment cannot be done by repeat the 2 previous steps, loosen the 2 nuts of height control sensor link and turn the link.

HINT:
^ To raise the vehicle, turn the link clockwise.
^ To lower the vehicle, turn the link counterclockwise.

5. Tighten the 2 nuts.
Torque: 5.4 Nm (55 kgf-cm, 48 inch lbs.)
6. Coat the threads of the link with sealer.
Sealer: Part No. 08833-00070, THREE BOND 1324 or equivalent

2. ADJUST HEIGHT CONTROL SENSOR (IN CASE OF NOT USING INTELLIGENT TESTER)
a. Inspect the vehicle height.

Vehicle Height:

2. Connect 3 dry cell batteries of 1.5 V to SHB terminal and its negative to SHG terminal and apply approximately 4.5 V voltage between terminals.
3. Measure the voltage between terminals SHB and SHG. The target voltage (Voltage between SHFL, SHFR, SHRR and SHB) can be obtained by driving this value by 2.

HINT: (Example)
Terminal voltage between SHB and SHG: 4.5 V
Target voltage: 2.25 V

4. Measure the voltage between SHFL (SHFR, SHRR) and SHG terminals when voltage is applied.

Standard Value:

5. Loosen the nut and adjust the positions of the height control sensor link and front upper suspension arm or rear lower control arm by moving them up and down to install them.
6. Tighten the nut.
Torque: 5.6 Nm (57 kgf-cm, 49 inch lbs.)

7. When adjustment cannot be done by repeat the 2 previous step, loosen the 2 nuts of height control sensor link and turn the link.

HINT:
^ To raise the vehicle, turn the link clockwise.
^ To lower the vehicle, turn the link counterclockwise.

8. Tighten the 2 nut.
Torque: 5.4 Nm (55 kgf-cm, 48 inch lbs.)
9. Coat the threads of the link with sealer.
Sealer: Part No. 08833-00070, THREE BOND 1324 or equivalent
3. ADJUST TORSION BAR SPRING (IN CASE OF USING INTELLIGENT TESTER)

NOTICE:
^ Perform the operation with vehicle unloaded (with the fuel tank filled up).
^ Temperature should be normal. (10 to 50°C, 50°F to 122°F in the engine compartment).
^ Perform this on a level place.

a. Connect the intelligent tester to DLC3 on the vehicle.
b. Start the engine and push the height to the N position.
c. With the ignition switch OFF, adjust the torsion bar spring so that the difference between right and left in vehicle height is less than 10 mm (0.039 inch)

HINT: To reduce the difference between right and left is tightening amount of torsion bar spring, adjust the both sides by the same amount.

NOTICE: Adjust it with no passenger are in.

d. Start the engine and push the height select switch to adjust the vehicle height from the N to LO then back to N position.
e. Stop the engine.
f. Read the pressure value of the front shock absorber with intelligent tester at this time.
Pressure: 6.5 ± 0.5 MPa (70 ± 5 kgf/cm2, 996 ± 71 psi)

HINT: The cylinder pressure read by the intelligent tester is estimated by the pump emitted pressure is approximately 2.2 MPa (12 kgf-cm, 171 psi) higher than the pressure read by the LSPV gauge (SST). If the value is not within the specification, adjust the torsion bar spring.

NOTICE: Make sure to turn the ignition OFF when adjusting the torsion bar spring.

HINT:
^ Approximately 0.2 MPa (2 kgf/cm2, 28 psi) changes when both right and left adjusting bolts are turned one turn.
^ The pressure rises when the adjusting bolts are loosened.

Pressure: 6.9 ± 0.3 MPa (70 ± 3 kgf/cm2, 996 ± 43 psi)
g. Start the engine and push the height select switch to adjust the vehicle height to the N position.
h. Check the fluid level.
4. ADJUST TORSION BAR SPRING (IN CASE OF NOT USING INTELLIGENT TESTER)

NOTICE:
^ Perform the operation with the vehicle unloaded (with the fuel tank filled up).
^ After and before using LSPV gauge (SST), make sure to clean the hose, gauge and adopter.

a. Start the engine and push the height select switch to adjust the vehicle height to the LO position.
b. With the ignition switch Off, discharge the suspension fluid AHC from the bleeder plug of the either front right or left wheel dumping force control actuator.

NOTICE: The fluid gushes out because of high pressure, so discharge the fluid in the same way as air bleeding.

c. Remove the bleeder plug of either right or left dumping force control actuator and install the LSPV gauge (SST).
SST 09709-29018
d. Start the engine and push the height select switch to adjust the vehicle height to the N position.
e. With the ignition switch OFF, adjust the torsion bar spring so that the difference between right and left in vehicle height is less than 10 mm (0.39 inch).

HINT: To reduce the difference between right and left of the torsion bar spring, tighten the same amount for loosening.

f. Start the engine and push the height select switch to adjust the vehicle height from the N to LO then back to N position.
g. Stop the engine.
h. Read the pressure value with LSPV gauge (SST) at this time.
SST 09709-29018
Pressure: 5.7 ± 0.3 MPa (58 ± 3 kgf/cm2, 825 ± 43 psi)
If the value is not within the specification, adjust the torsion bar spring.

NOTICE: Make sure to turn the ignition OFF when adjusting the torsion bar spring.

HINT:
^ Approximately 0.2 MPa (2 kgf/cm2, 28 psi) changes when both right and left adjusting bolts are turned one turn.
^ The pressure rises when the adjusting bolts are loosened.

i. Start the engine and push the height select switch to adjust the vehicle height to the LO position.
j. With the ignition switch OFF, discharge the suspension fluid AHC from the bleeder plug of LSPV gauge (SST).
SST 09709-29018

CAUTION: The fluid gushes out because of high pressure, so discharge the fluid in the same way as air bleeding.

k. Remove the LSPV gauge (SST).
SST 09709-29018
l. Install the bleeder plug.
Torque: 8.3 Nm (84 kgf-cm, 73 inch lbs.)
m. Bleed the air.

HINT: Bleed the bleeder plug with LSPV gauge (SST) installed to only once.

n. Check the fluid level.

INSTALLATION
Installation is in the reverse order of removal.

HINT: After installation, fill AHC pump motor reservoir with suspension fluid AHC, bleed the AHC system and check for leaks.