At Low Fluid Temperature

• Fluid viscosity and frictional characteristics of the clutch facing change with fluid temperature. Clutch engaging or band-contacting pressure is compensated for, according to fluid temperature, to stabilize shifting quality.
• The line pressure is reduced below 60°C (140°F) to prevent shifting shock due to low viscosity of automatic transmission fluid when temperature is low.

Fig 1: Low Fluid Temperature Graph (1 Of 2)

Courtesy of NISSAN MOTOR CO., U.S.A.

Line pressure is increased to a maximum, irrespective of the throttle opening, when fluid temperature drops to -10°C (14°F). This pressure rise is adopted to prevent a delay in clutch and brake operation due to extreme drop of fluid viscosity at low temperature.

Fig 2: Low Fluid Temperature Graph (2 Of 2)

Courtesy of NISSAN MOTOR CO., U.S.A.