* Low Brake Fluid: This is the simplest and easiest to check. Low fluid indicates a leak somewhere in the braking system, which could affect the ABS. Check your brake fluid reservoir and add fluid if needed. However, *do not* just add fluid; you must find and fix the leak.
* Faulty ABS Sensor: These sensors monitor wheel speed. A faulty sensor (one or more) will cause the light to illuminate. They can become dirty, damaged, or simply fail.
* Faulty ABS Control Module (PCM): This is the "brain" of the ABS system. A failing module can cause a variety of issues, including the ABS light staying on. This is often the most expensive repair.
* Faulty ABS Pump Motor: The pump is responsible for regulating pressure within the ABS system. If it's malfunctioning, the light will come on.
* Wiring Problems: Damaged or corroded wiring within the ABS system can disrupt communication and trigger the light. This can be difficult to diagnose without a wiring diagram.
* Wheel Speed Sensor Ring: The sensor ring is a toothed ring on the wheel hub that the sensor reads to determine wheel speed. Damage or corrosion to this ring can cause a faulty reading.
* Fuse or Relay Problems (Less Common): While less frequent, a blown fuse or a faulty relay related to the ABS system can also be a culprit.
Troubleshooting Steps (in order of ease):
1. Check Brake Fluid Level: This is the absolute first step. Low fluid is often the culprit.
2. Visual Inspection: Examine the ABS sensors and their wiring for any obvious damage or corrosion. Look for leaks in the brake lines.
3. ABS Diagnostic Scan: The best way to diagnose the problem accurately is to use an OBD-II scanner (though older G10s might not fully support OBD-II, a generic scanner might still pull some codes). A mechanic with a professional scan tool can read the ABS system's diagnostic trouble codes (DTCs), pinpointing the exact problem.
4. Professional Mechanic: If you're not comfortable troubleshooting electrical systems or working with brakes, it's best to take your van to a qualified mechanic. Attempting to fix the problem yourself without proper knowledge could be dangerous.
Important Note: Driving with the ABS light on means your ABS system is not functioning. While you can still brake, you will lose the benefits of ABS (reduced stopping distance, preventing wheel lockup). Get it checked as soon as possible.
