[2] Check component R48/1 (Thermostat).: Short circuit to ground

[2] Check component R48/1 (Thermostat).: Short circuit to ground

Test 1: Check component R48 (Two-disk thermostat heating element).

1. Check component R48 (Two-disk thermostat heating element).

Test 1.1: Function description R48 (Two-disk thermostat heating element)

Test 1.2: Actuation of component R48 (Two-disk thermostat heating element)

Test 1.3: Guided test

1.1. Function description R48 (Two-disk thermostat heating element)
Note

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1.1. No further information available.


1.2. Actuation of component R48 (Two-disk thermostat heating element)
Actuation of component R48 (Two-disk thermostat heating element)
Figure legend

- R48 (Two-disk thermostat heating element)
Special tool

- Adapter cable220 589 00 99 37
Test sequence

- Switch off ignition.
- Detach coupling at component R48 (Two-disk thermostat heating element).
- Connect adapter cable between component R48 (Two-disk thermostat heating element) and engine wiring harness.
- Measure direct voltage with multimeter between sockets 1 and 2
- Switch on ignition.
Specified value in the case of actuation: [9...14] V Move on to actuation with button F2







Warning!Communication with ECU required.


1.3. Guided test
Power supply Check component R48 (Two-disk thermostat heating element).
Figure legend

- R48 (Two-disk thermostat heating element)
Special tool

- Adapter cable220 589 00 99 37
Test sequence

- Switch off ignition.
- Detach coupling at component R48 (Two-disk thermostat heating element).
- Connect adapter cable no. 220 589 00 99 37 to engine wiring harness R48 (Two-disk thermostat heating element).
- Measure direct voltage with multimeter between ground and socket (R48x1) 2
- Switch on ignition.
Specified value

- Voltage[11...14] V
Question

- Is the measurement value OK?







YES
Check internal resistance of component R48 (Two-disk thermostat heating element).
The measurement value is OK.Figure legend

- R48 (Two-disk thermostat heating element)
Test sequence

- Switch off ignition.
- Connect adapter cable no. 220 589 00 99 37 at component R48 (Two-disk thermostat heating element).
- Test resistance.
- Measure resistance with multimeter between sockets (R48) 1 and (R48) 2
Specified value

- Resistor[12...18]ohms
Question

- Is the measurement value OK?







YES
Test signal line between components N3/9 (CDI control unit) and R48 (Two-disk thermostat heating element) for Open circuit.
Figure legend

- R48 (Two-disk thermostat heating element)
Special tools

- Test cable 266 589 01 63 00
- Socket box 129 589 00 21 00
Test sequence

- Switch off ignition.
- Unplug connector of control module and component.
- Connect 126-pole socket box at engine wiring harness.
- Measure resistance with multimeter between socket (M.32) 32 of the 126-pole socket box tester and socket (R48x1) 1
Specified value

- Resistor< 1ohms
Question

- Is the measurement value OK?







YES
The measurement value is OK.Further procedure

- In the event of stored faults with a high fault frequency count or in the event of customer complaints, check lines and connectors for loose contact and corrosion..
Other possible cause of fault

- Component R48 (Two-disk thermostat heating element) is mechanically damaged or it sticks.
End of test

NO
The measurement value is not OK.Possible cause and remedy

- Test lines between components N3/9 (CDI control unit) and R48 (Two-disk thermostat heating element) for Open circuit.
End of test

NO
The measurement value is not OK.Replace component R48 (Two-disk thermostat heating element).End of test

NO
The measurement value is not OK.Possible cause and remedy

- Test lines between components N3/9 (CDI control unit) and R48 (Two-disk thermostat heating element) for Open circuit.
End of test