Pre-Inspection

Inspection
Before performing diagnostics, check the following items which might affect VDC problems:

1. BATTERY
Measure battery voltage and specific gravity of electrolyte.
Standard voltage: 12 V, or more
Specific gravity: Above 1.260

2. BRAKE FLUID
1. Check brake fluid level.
2. Check brake fluid leakage.

3. HYDRAULIC UNIT
Check the hydraulic unit VDC.

4. BRAKE DRAG
Check brake drag.

6. TIRE
Check tire specifications, tire wear and air pressure.

WARNING LIGHT ILLUMINATION PATTERN





INSPECTION
1. When the warning and/or indicator lights do not illuminate in accordance with this illumination pattern, there must be an electrical malfunction.
2. When the warning and/or indicator lights remain constantly OFF, repair the warning and/or indicator lights circuit or diagnosis circuit.

NOTE:
- Even though the ABS warning light does not go out 1.5 seconds after it illuminates, the VDC system operates normally when the warning light goes out while driving at approximately 12 km/h (7 MPH). However, the Anti-lock brakes do not work while the ABS warning light is illuminated.
- It may take a few minutes for the VDC OFF indicator light to go out when the vehicle is exposed for some time in a low temperature area. This is not a problem because of low engine coolant temperatures.
- If a vehicle wheel is stuck or free-spinning for approximately 1 minute, power transfer fluctuation to the remaining wheels will occur. Power transfer conditions will differ from those occurring during normal vehicle operation. The ABS sensor will detect this condition. The ABS and VDC warning lights will illuminate. If the vehicle is operated with the four wheels lifted off the ground or with the four wheels placed on rollers, the VDCCM will detect a problem with the speed sensor and the ABS and VDC warning lights may illuminate. In this case, there is no abnormality. Clear the diagnostic code from memory.
- When the engine is started and vehicle movement begins, the VDCH/U motor pump and solenoid valve will operate for a few seconds. This permits checking of VDC function. Normal motor pump and solenoid valve operational noise will be heard. Normal brake pedal kick back will be felt when the brake pedal is depressed. In this case, there is no abnormality.