900 L4-1985cc 2.0L SOHC (1988)
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
25/18 Degree
Non-Turbo
Fig. 28 Thermostatic Switch
The thermostatic switch, Fig. 28, is closed at temperatures below 77°F (25°C). If the temperature has been higher than this, the switch will not close
until the temperature has fallen to 66°F (19°C).
The switch is connected in parallel with terminal 12 in the ECU via terminal X1 in the decel relay. At temperatures below 77°F (25°C), terminal 12 in
the ECU is grounded and a pulse ratio of 60° is selected. At temperatures above 77°F (25°C), the thermostatic switch is open and the preset pulse ratio
is not selected.
Turbo
Fig. 29 Thermostatic Switches
The thermostatic switch, Fig. 29, is closed at temperatures below 77°F (25°C). If the temperature has been higher than this, the switch will not close
until the temperature has fallen to 66°F (19°C).
The switch is connected in parallel with terminal 12 in the ECU. At temperatures below 77°F (25°C), terminal 12 in the ECU is grounded and a fixed
pulse ratio of 60° is selected. At temperatures above 77°F (25°C), the thermostatic switch is open and the preset pulse ratio is not selected.
