It’s frustrating when dashboard warning lights illuminate, especially in sophisticated systems like your Mercedes-Benz’s Electronic Traction System (ETS) and Anti-lock Braking System (ABS). Many DIYers and car enthusiasts reach for their trusted OBD2 scanners to decipher these automotive mysteries. The Actron CP9135 OBD2 scanner is a popular choice, known for its user-friendliness and effectiveness in diagnosing engine-related issues. However, when confronted with persistent ETS and ABS lights, particularly on models like the 1998 Mercedes-Benz W210 E320, you might find yourself facing a perplexing “No Faults Detected” message, even when using your Actron scanner.
This situation raises important questions about the capabilities of standard OBD2 scanners like the Actron CP9135 when it comes to diagnosing complex systems beyond the engine. Let’s delve into why your Actron scanner might be coming up short in reading ETS/ABS codes and what steps you can take to accurately diagnose and resolve these warning lights.
One common experience, mirroring that of a Mercedes W210 owner, involves encountering the ETS and ABS lights, often triggered during turns. Despite connecting an Actron CP9135 scanner, the frustrating message of “no faults detected” appears. This immediately begs the question: Do you need a different type of scanner to retrieve ETS/ABS codes? The answer, in many cases, is yes.
Standard OBD2 scanners, including the Actron CP9135, are primarily designed to read generic powertrain (engine and transmission) Diagnostic Trouble Codes (DTCs) mandated for emissions compliance. While incredibly useful for engine misfires, sensor failures, and related issues, their capabilities are often limited when it comes to reading codes from other vehicle systems like ABS, ETS, SRS (airbags), and body control modules. These systems often utilize proprietary communication protocols and fault codes that go beyond the scope of basic OBD2 scanners.
Therefore, to effectively diagnose ETS/ABS light issues on your Mercedes W210, or similar vehicles with advanced electronic systems, you will likely need a scanner with enhanced diagnostic capabilities. This could include:
- An ABS-specific scanner: These tools are designed to specifically communicate with and retrieve codes from the ABS module.
- A professional-grade scan tool: These more advanced scanners, often used by professional mechanics, can access a wider range of vehicle systems and manufacturer-specific codes, including those for ABS and ETS on Mercedes-Benz vehicles.
- A Mercedes-Benz specific scanner: Some scanners are specifically designed for Mercedes-Benz vehicles and offer deep diagnostic capabilities across all systems.
Another question raised is whether to use the Actron scanner to reset IM Readiness functions. IM Readiness monitors relate to emissions testing and are generally independent of ABS/ETS issues. Resetting them with your Actron scanner is unlikely to impact the ETS/ABS lights and is more relevant when preparing for an emissions test after clearing engine-related codes.
The original poster also mentions a brake light issue and a recently replaced stop light switch. Could these be related to the ETS/ABS lights? Absolutely. The brake light system is interconnected with both the ABS and ETS. A faulty brake light switch, wiring issues, or even a blown bulb can indeed trigger these warning lights. The system logic often interprets discrepancies in the brake light circuit as potential braking system malfunctions, activating the ABS and ETS warnings as a safety precaution. While a visual inspection of brake lights and wiring is a good starting point, it’s still crucial to retrieve the actual fault codes from the ABS/ETS system to pinpoint the root cause accurately. Replacing parts without knowing the specific code can be a shot in the dark and may not resolve the underlying problem.
In conclusion, while your Actron CP9135 OBD2 scanner is a valuable tool for many car diagnostic tasks, its limitations become apparent when dealing with complex systems like ABS and ETS, especially on European vehicles like Mercedes-Benz. When troubleshooting ETS/ABS lights, investing in or accessing a scanner capable of reading ABS and manufacturer-specific codes is essential for effective diagnosis and repair. Don’t rely solely on generic OBD2 readings when dealing with these critical safety systems. Accurate diagnosis through the correct diagnostic tools will save you time, money, and ensure the safety and proper functioning of your vehicle’s braking and stability systems.
[
