I'm looking for advice on diagnosing and fixing an ABS warning light issue on my Renault Megane III Coupe 1.4 TCe (2009). Below are the details:
Car Details:
- Make and Model: Renault Megane III Coupe 1.4 TCe
- Year: 2009 (April)
- Fuel Type: Petrol
- Current Mileage: 33,000 miles
- Steering Configuration: Left-hand drive (EU specification)
- Location: Milton Keynes, UK
- Estimated Car Value: £2,500
Issue:
The ABS warning light remains on despite a battery replacement, brake fluid change, and brake pad replacement.
Diagnostics:
- I used a FOXWELL NT630 Plus OBD2 Scanner, which returned the trouble code DF010 with the message:
"Memory, PUMP MOTOR CIRCUIT - Incorrect supply voltage or short circuit."
- I have cleared the code multiple times, but it keeps returning.
- When attempting to run the ABS pump motor test, the scanner displays: "Operation impossible."
Additional Information:
- I am the original owner, having bought the car brand new. It has only covered 33,000 miles and I'm currently averaging around 1,000 miles per year.
- The car is currently SORN as it would not pass the MOT test.
- The compatible replacement ABS pump part numbers are 476604304R and 476602736R.
- A Renault service provider quoted:
- £160 for diagnostics (with potential additional labour charges)
- £1,000 for labour if replacement of ABS pump is needed (6.3 hours)
- £1,300 for a replacement ABS pump and parts
- The total repair cost equals the car's estimated value, so I want to explore DIY diagnosis and possible repairs to reduce costs.
- I enjoy learning about car repairs and have handled regular servicing myself using online resources.
Questions:
1. Diagnosis and Next Steps
What could be the potential cause of the DF010 error and ABS warning light?
Do you agree with ChatGPT's recommendation to focus on inspecting the hydraulic unit (especially the pump motor), the ABS control module, and the relay or fuse that powers the pump motor?
I plan to take the following diagnostic steps:
- Inspect the ABS pump motor connections and wiring for visible damage or corrosion
- Check ABS fuses and relays for proper functionality
- Perform a voltage test on the ABS pump motor circuit
- Use a multimeter to test for continuity in wiring and connectors
Would you recommend any additional steps?
2. ABS Fuse Locations
I have checked the fuse box under the bonnet next to the battery, and all fuses appear fine.
Are there any other fuse boxes related to the ABS pump that I should inspect? If so, where are they located?
3. Locating and Inspecting the ABS Pump
I struggled to locate the ABS pump. The Haynes manual states:
- Drain the AC system at a garage or via a mobile air conditioning service
- The hydraulic unit is located in the far right-hand rear corner of the engine compartment, against the bulkhead
- Access to the unit is far from easy
Do I really need to drain the AC system to access the ABS pump? Can I do this myself, or must I take it to a specialist garage?
What is the best way to locate and inspect the ABS pump?
Best regards