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Coolant leakage from the preheated crankcase ventilation

Symptom: Coolant leakage from the preheated crankcase ventilation. The leakage could cause the shaft for the swirl valves to bind which illuminates the CHECK ENGINE lamp, as well as generating diagnostic trouble code P1109.

Coolant leakage from the preheated crankcase ventilation

Fault symptom

Coolant leakage from the preheated crankcase ventilation. The leakage could cause the shaft for the swirl valves to bind which illuminates the CHECK ENGINE lamp, as well as generating diagnostic trouble code P1109.

Criteria

Cars with engine alternative Z19 before Vehicle Identification Number 61102113 could be subject to coolant leakage from the small return line for the crankcase ventilation due to an incorrect hose clip. An improved hose clip has been introduced after the above Vehicle Identification Number.

The hose clip could leak both when the engine is cold and when it is at operating temperature. The leakage can be seen adjacent to the lower section of the engine's intake manifold.

Procedure

Check whether there is any coolant leakage in accordance with the above. Replace the hose clip with a standard hose clip. Clear any diagnostic trouble codes.