Variable Coolant Pump
| ITEM | DESCRIPTION |
|---|---|
| 1 | Variable coolant pump shroud position sensor |
| 2 | Variable coolant pump shroud solenoid |
The variable coolant pump is installed at the front left of the cylinder block. A pulley attaches to the pump flange. The accessory drive belt drives the pulley at engine speed.
The PCM determines the required level of cooling upon the following inputs:
- Cylinder head temperature
- Cylinder block temperature
- Ambient temperatures
- Engine coolant temperature
- Minimum flow map.
The calibration is able to control the variable coolant pump flow in 5 steps and is controlled by an open-loop map.
The control of the shroud solenoid is by a PWM signal from the PCM . The internal pressure within the pump acts against a return spring in the housing. Without a signal from the PCM the solenoid is de-energized. Therefore the shroud returns to its base position under spring force, resulting in full flow from the coolant pump.
For additional information, refer to: ENGINE COOLING