L26 ELECTRIC AIR PREHEATING IS NOT ACTIVATED WITH LOW EXTERNAL TEMPERATURE() - Fiat - STILO - eLearn

3360305 - L26 ELECTRIC AIR PREHEATING IS NOT ACTIVATED WITH LOW EXTERNAL TEMPERATURE()

Outdoor temperature information is displayed correctly on the reconfigurable matrix.

The electrical preheating device (present only on the JTD version) consists of two coils (PTC) of different resistance ratings that generate a maximum power of 700 W when current flows through them. the control unit is able to modulate the heating by activing one coil or both.

System activation is permitted only under the following conditions:

key on and climate control system activated;
Outdoor temperature lower than 20° C;
Coolant temperature lower than 64° C;
battery voltage higher than 12.2V;
engine speed greater than 700 rpm.

0	PRELIMINARY CHECK	All OK	Problems met	Operation
		Results of the tests
	Check the condition of the fuses specific to the air preheating system (electric):	Continue to Step 1	Fuse blown	Replace the blown fuse
1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the Examiner and check for errors in the PTC device control relays	Continue to Step 2	Relay damaged	Change the damaged relay
2	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Keep the Examiner connected and run active diagnosis on the two coils (PTC).	Continue to Step 5	Mulfunctioning of both coils (PTC).	Continue to Step 3
3	CHECKING ELECTRICAL CIRCUIT	All OK	Problems met	Operation
	Check that: the electrical connectors are properly inserted in the relevant device sockets; continuity/insulation of the electrical connection between the climate control system Node, the control relays and the coils (PTC); supply signal to the coils (PTC).	Continue to Step 4	electrical connectors incorrectly connected.	Connect the electrical connectors correctly.
			Electrical connection interrupted or not insulated.	Restore continuity/insulation of electrical connection See E6020 AIR CONDITIONING
			Supply signal missing	Continue to Step 5
4	CHECKING CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	The fault persists	Change the coils (PTC)
5	CHECKING CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	The fault persists	Change the climate control node Op. 5040D18Search for the fault starting from another symptom'