Supercharger Coolant Pump: Description and Operation

Charge Air Cooler Water Pump

The charge air cooler water pump monitor has been implemented to prevent engine damage, in the event of water pump failure. The monitor is only present on supercharged variants and operates continuously during each drive, with a sample rate of 2.048 seconds. The basic operation of the monitor is to compare the value of the intercooler IAT 2 against the IAT 1, at the end of a period of steady state operating conditions. Once the defined steady state conditions are satisfied, a drive delay counter is incremented. Upon exceeding a calibrated threshold, if the difference between the two temperature values (IAT 2 - IAT 1) is greater than the mapped threshold, a failure counter is incremented. If the counter exceeds a calibrated threshold, a failure judgment is made. A normal judgment is made if the two temperature values are below the failure threshold, at the point of judgment.