Engine Does Not Heat Up To Operating Temperature (LI20.00-P-063327)

Publication date: 2017-08-17
Reference number: LI20.00-P-063327

ENGINE DOES NOT HEAT UP TO OPERATING TEMPERATURE

TECHNICAL SERVICE BULLETIN

Reference Number(s): LI20.00-P-063327 Version 4, Date of Issue: August 17, 2017

MERCEDES-BENZ:	All vehicles with an M133 engine
DESIGN GROUP:	06.50 Cooling
REASON FOR CHANGE:	Updated Xentry AddOn number

COMPLAINT

Check Engine Light/Engine does not heat up

NOTE: Check engine light may illuminate with possible fault code: P012800 - "The coolant temperature is below the coolant thermostat specified temperature." stored in the engine control unit.

CAUSE

Various causes

REMEDY

Perform the following operations:

Perform guided test for fault code: P012800
Strict compliance with operation steps in XENTRY/DAS is absolutely essential.

NOTE: Use Xentry/DAS version 07/2017 with AddOn 8036 or higher

Regardless of the result:

Check software release of engine control unit; update if necessary
If complaint still exists or vehicle returns with the same complaint:
- Drain coolant, check condition of coolant and take photos
- Thoroughly flush cooling system; it is essential to flush heater cooler in both directions.
- Remove coolant thermostat and document production date or take photo
- Replace coolant thermostat
NOTE: Please attach the photos, the results of the coolant check and the production date of the thermostat with the repair order/claim.

CONTROL UNIT/FAULT CODE

Control unit	Fault code	Fault text
N3/10 - Motor electronics 'MED40AMG' for combustion engine 'M133' (ME)	P012800	The coolant temperature is below the coolant thermostat specified temperature. _

PARTS

Part number	ES1	ES2	Designation	Quantity	Note	EPC
A 270 200 06 15			Coolant thermostat	1		X

OPERATION NUMBERS/DAMAGE CODES

Op. no.	Operation text	Time	Damage code	Note
			20102 52