2015 vw passat tdi check engine light.
Charge air cooler coolant pump control circuit low.
Usually a charge air cooler means an air to air cooler where the heat is rejected using ambient air flowing through the heat exchanger much like the engine s coolant radiator.
Obd ii code wiring issue is defined as a charge air cooler coolant pump control circuit low.
Code p023b charge air cooler coolant pump control circuit low is active when there is a low electrical value within the charge air cooler coolant pump and or its circuit.
For those who get this check engine light with this code something to check before taking to stealership.
The pcm sets the obdii code when the charge air cooler coolant pump is out of factory specifications.
If the ecm detects an improper voltage on the pump relay control circuit this dtc sets.
This allows the spring tension to separate the relay armature contact from the relay load circuit contact which interrupts current flow to the supercharger charge air cooler coolant pump.
Charge air cooling is an important feature of many modern boosted diesel engines that can be used to reduce emissions and fuel consumption and increase power density charge air can be cooled with engine coolant ambient air or a separate low temperature liquid circuit.
This system uses its own coolant pump that is electronically controlled by the engine computer.
What is the severity of this dtc.
The supercharger has an integrated intercooler radiator with its own coolant system to reduce the temperature of the air being forced into the engine.
Severity in this case would be low.
In most cases this fault will not present any immediate safety concerns.
Obd ii code wiring issue is defined as a charge air cooler coolant pump control circuit open.
Charge air cooler is simply an all encompassing term referring to a system that cools the compressed charge air before it is routed into the engine.
The supercharger has an integrated intercooler radiator with its own coolant system to reduce the temperature of the air being forced into the engine.
In an indirect charge air cooling system rather than being released directly to the ambient air the heat from the charge air cooler first passes through a separate low temperature coolant circuit lt cooling circuit before being discharged to the ambient air by a downstream low temperature radiator lt radiator the lt radiator of the indirect charge air cooling.
