Driving a Honda CRV and getting a shudder through the car when your parking or doing a U turn? This is a very common fault with the CRVs and it is often misdiagnosed. The symptoms can feel like CV Joints or something binding up as you are moving slowly and turning.
The problem is actually the oil in the rear diff. It is a special oil for a special diff system designed by Honda.
Before we get into the technical side of things, if you are experiencing this fault, simply replace the diff oil, however make sure you buy the DPSF Fluid from Honda.
Additionally these cars are known for a CV joint wobble at higher speeds this should not be mistaken as a the DPSF fault. If your issue is only happening at slow speeds its the diff oils, if its at higher speeds its probably not.
How does it all work. Stolen from adwiki.com
Most of the time front wheels are driven; it’s only when they begin to lose grip that the Dual Pump system starts to send power to the rear wheels. This is achieved by a hydraulic torque-split system, consisting of a conventional front-wheel drive arrangement, complete with transfer case, a tail shaft running the length of the vehicle and a Dual Pump system integrated with the rear differential. This is the heart of the system and comprises two hydraulic pumps, one driven by the front wheels via the prop shaft, the other by the rear wheels via the rear differential.
During normal levels of grip the front and rear wheels, and their respective pumps, turn at the same speed; hydraulic pressure circulates between the two pumps, but no pressure is generated. If the front wheels begin to lose traction and start to spin faster than those at the rear, the two pumps turn at different rates; hydraulic pressure proportional to the difference in their speeds is generated, which in turn opens a valve body and activates a mechanical, multi-plate clutch.
This clutch then connects the front prop shaft to the rear diff, which feeds precisely the correct amount of torque to the rear wheels to re-establish overall traction. The more the front wheels slip, the greater the torque fed to the rear wheels.
The Dual Pump arrangement weighs less than a conventional four-wheel drive system and demands little maintenance – just a fluid change at 72,000 miles and thereafter every 36,000 miles. Further advantage of this design is that it automatically disengages under braking, thereby allowing the ABS to operate.
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