Connect Scantool to Data Link Connector (DLC).
Warm engine up to normal operating temperature.
Turn "OFF" electrical devices and A/C.
Monitor "DIFFERENTIAL PRESSURE" and "PRESSURE PRE CPF" parameter on the scantool.
Specification : "DIFFERENTIAL PRESSURE" and "PRESSURE PRE CPF" data vary normally. even at the temperature of below 0℃
Fig. 1) When turning enigne ON at below 0℃ in which water freezes, monitor if "DIFFERENTIAL PRESSURE" and "PRESSURE PRE CPF" data vary normally.
When data do not vary
☞ Check if diconnected differential pressure sensing hose or pressure leakage is detected. Check if the deformation(which may disturb water flow)