Cooling System - MIL ON/ Code 2F22 Set

SI M 17 01 09
Cooling System

May 2009
Technical Service

SUBJECT
DME Fault Code 2F22 "Engine Temperature Plausibility"

MODEL
R55, R56, R57 with N12, N14

SITUATION

Service Engine Soon lamp is illuminated and the fault code 2F22 (Engine temperature plausibility) is stored in DME.

CAUSE

The DME calculates an implausible signal from the coolant temperature sensor. The diagnostic influences on this signal include:

1. Engine speed

2. Heating output

3. Outside temperature

4. Warm-up phase condition

CORRECTION

1. Check the coolant level: Check and repair any causes for leaks. After completing repairs, pressure test the system, including the overflow cap. Top up to correct level if needed.

2. Check the antifreeze condition: Ensure there is a sufficient 50/50 mix.

3. Bleed the system; Follow Repair Instruction RA17 00 005 for proper bleeding of the cooling system

WARRANTY INFORMATION

For information only