Suspension Control System (w/ KDSS)

SUSPENSION CONTROL: SUSPENSION CONTROL SYSTEM (w/ KDSS): HOW TO PROCEED WITH TROUBLESHOOTING

HOW TO PROCEED WITH TROUBLESHOOTING
HINT:
- The following troubleshooting procedure relates to non-electrical system problem symptoms only.
- For malfunctions in electrical systems such as accumulator pressure sensor, stabilizer control ECU and wire harness, refer to "HOW TO PROCEED WITH TROUBLESHOOTING" on KINETIC DYNAMIC SUSPENSION SYSTEM section How To Proceed With Troubleshooting.

1. Vehicle conditions:






2. Suspension fluid
HINT: Check the suspension fluid pressure using the Techstream.

Standard::
2.60 to 3.00 MPa (2,600 to 3,000 kPa) at 20°C (68°F) (Fluid temperature)
2.90 to 3.40 MPa (2,900 to 3,400 kPa) at 35°C (95°F) (Fluid temperature)






3. The right and left sides of the vehicle are not level. (*A)
1. CHECK SUSPENSION FLUID PRESSURE USING TECHSTREAM
Charging pressure:
2.60 to 3.00 MPa (2,600 to 3,000 kPa) at 20°C (68°F) (Fluid temperature)
2.90 to 3.40 MPa (2,900 to 3,400 kPa) at 35°C (95°F)(Fluid temperature)
OK -- REPLACE FRONT AND REAR CYLINDERS
NG -- Continue to next step.
2. ADD SUSPENSION FLUID AND BLEED ANY AIR OUT OF FLUID
(a) Add suspension fluid and bleed any air out of the fluid.
(b) Check that the right and left sides of the vehicle are level.
Standard:
The right and left sides of the vehicle are level.
OK -- END
NG -- REPLACE STABILIZER CONTROL WITH BRACKET VALVE ASSEMBLY
4. VEHICLE ROLLS EXCESSIVELY DURING DRIVING (*B)
1. CHECK FOR ELECTRICAL SYSTEM MALFUNCTIONS
(a) Check for electrical system malfunction.
Standard:
No malfunctions.
NG -- REPLACE MALFUNCTIONING ELECTRICAL SYSTEM PARTS
OK -- Continue to next step.
2. CHECK FOR SUSPENSION FLUID LEAKS AND CHECK EACH BUSH
STANDARD:
No leaks nor permanent deformation
NG -- REPLACE BUSHES OR PARTS WHERE FLUID LEAKS
OK -- Continue to next step.
3. ADD SUSPENSION FLUID AND BLEED ANY AIR OUT OF FLUID
(a) Add suspension fluid and bleed any air out of fluid.
(b) Check that the roll motion returns to the normal condition.
Test drive:
Roll motion returns to the normal condition.
OK -- END
NG -- Continue to next step.
4. REPLACE STABILIZER CONTROL VALVE
(a) Replace the stabilizer control valve, as the accumulator solenoid valve may be malfunctioning.
Test drive:
Roll motion returns to the normal condition.
OK -- END
NG -- REPLACE FRONT AND REAR CYLINDERS
5. SUSPENSION FLUID PRESSURE IS ABNORMALLY LOW (*C)
1. CHECK SUSPENSION FLUID PRESSURE USING TECHSTREAM
Charging pressure:
2.60 to 3.00 MPa (2,600 to 3,000 kPa) at 20°C (68°F) (Fluid temperature)
2.90 to 3.40MPa (2,900 to 3,400 kPa) at 35°C (95°F) (Fluid temperature)
OK -- CHECK FOR ELECTRICAL SYSTEM MALFUNCTIONS
NG -- Continue to next step.
2. CHECK FOR SUSPENSION FLUID LEAKS
STANDARD:
No leaks
NG -- REPLACE PARTS WHERE FLUID LEAKS
OK -- Continue to next step.
3. CHECK FOR AIR IN SUSPENSION FLUID
HINT: This check is to confirm that the suspension fluid pressure is not low because of N2 gas in the fluid. When the bellows in the stabilizer control with accumulator housing assembly is malfunctioning, N2 gas enters the suspension fluid, causing the fluid pressure to decrease.

STANDARD:
No gas is present.
NG -- REPLACE STABILIZER CONTROL WITH ACCUMULATOR HOUSING ASSEMBLY
OK -- ADJUST SUSPENSION PRESSURE FLUID PRESSURE TO SPECIFIED RANGE
6. SUSPENSION FLUID PRESSURE IS ABNORMALLY HIGH (*D)
1. CHECK SUSPENSION FLUID PRESSURE USING TECHSTREAM
Charging pressure:
2.60 to 3.00 MPa (2,600 to 3,000 kPa) at 20°C (68°F) (Fluid temperature)
2.90 to 3.40MPa (2,900 to 3,400 kPa) at 35°C (95°F) (Fluid temperature)
OK -- CHECK FOR ELECTRICAL SYSTEM MALFUNCTIONS
NG -- Continue to next step.
2. ADD SUSPENSION FLUID AND BLEED ANY AIR OUT OF FLUID
(a) Add suspension fluid and bleed any air out of fluid.
Test drive:
Pressure is within the specified range.
OK -- END
NG -- REPLACE STABILIZER CONTROL WITH BRACKET VALVE ASSEMBLY