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Nissan Leaf Water Pump


Commonly referred to as water pump 1, this pump is located on the driver’s side of the engine bay next to the motor itself (refer to images for location). The fault codes associated with this pump are P31E8 and P31E9



Controlling the water pump

Via pin 3 (see attached files) you can control the speed of the pump. It requires a switched to ground PWM signal. Not all inputs are valid. See below table and graph for the correlation. The normal operating range is defined by the following formula RPM = 68,8 x PWM – 550.



(pwm %)


0 – 8

Invalid input

8 – 12


13 – 17

Invalid input

18 – 20


21 – 79

(65,8 x PWM – 550)

80 – 82


83 – 100

Invalid input

If you do not provide a normal input after a short startup and diagnostics time (4 to 7 seconds) the pump will start running at full speed.

Product Details
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2 other products in the same category:

Reference: MES 70/6E2

Vacuum pump MES 70/6E2 (used)

The 70 / 6E2 pump shown here is manufactured specifically for electric vehicles by MES Switzerland. The 70 / 6E2 has very low levels of noise and acoustic vibration and barely noticed during operation. The vacuum is controlled by an integrated control circuit consisting of a vacuum sensor and a solid-state vacuum switch. The 70 / 6E2 has an absolute...

Price €249
In stock

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