ECVT Trouble Code 31

Trouble code 31 from the ECVT Clutch Control Unit (CCU) may be due to the engine idle speed being too high.

The reason this code is displayed is because of the fail-safe function of the clutch control unit.

The clutch control unit looks for input from many areas for proper operation. Some of these inputs are from the accelerator switch and the tachometer signal from the Distributor.

If the Clutch Control Unit sees a tachometer signal above 1,000 rpm, but no signal from the accelerator switch, it assumes that the vehicle is trying to be driven and will start to engage the electromagnetic clutch. Since the Clutch Control Unit sees no input signal from the accelerator switch, it assumes it to be defective and will turn on the "check ECVT" light and, in most cases, display the code for the accelerator switch.

If this condition is happening, the car may creep when the shifter is put into "D" or "DS" range with the brake off and the vehicle on level ground.

The fix is simple. Check and adjust accelerator switch, engine timing and rpm's to specs.

There are, of course, other things that can also produce this trouble code but this simple check should not be overlooked.