[1] Check component R39/1 (Vent line heater element).: Short circuit to positive

[1] Check component R39/1 (Vent line heater element).: Short circuit to positive

Test 1: Check component R39/1 (Vent line heater element).

1. Check component R39/1 (Vent line heater element).

Test 1.1: Check power supply of component R39/1 (Vent line heater element).

Test 1.2: Check internal resistance of component R39/1 (Vent line heater element).

Test 1.3: Test wiring from component N3/9 (CDI control unit) to component R39/1 (Vent line heater element) with an ohmmeter for short circuit (positive or negative) and repair, if necessary.

1.1. Check power supply of component R39/1 (Vent line heater element).
Figure legend

- 003Multimeter
- a Adapter cable
- R39/1 (Vent line heater element)
Special tool

- Adapter cable220 589 00 99 35
Test sequence

- Switch off ignition.
- Detach coupling at component R39/1 (Vent line heater element).
- Connect adapter cable no. 220 589 00 99 35 to engine wiring harness R39/1 (Vent line heater element).
- Connect multimeter as specified in connection diagram (right-hand figure).
- Ignition ON
- Measure direct voltage with multimeter between sockets (R39/1x1) 1 and (R39/1x1) 2
Specified value

- Voltage[8,0...9,0] V
Question

- Is the measurement value OK?







YES
The measurement value is OK.Possible cause and remedy

- Check internal resistance of component R39/1 (Vent line heater element).
End of test

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

- Check lines between R39/1 (Vent line heater element) and N3/9 (CDI control unit)
End of test

1.2. Check internal resistance of component R39/1 (Vent line heater element).
Figure legend

- 003Multimeter
- Adapter cable
- R39/1 (Vent line heater element)
Special tool

- Adapter cable220 589 00 99 35
Test sequence

- Switch off ignition.
- Detach coupling at component R39/1 (Vent line heater element).
- Connect adapter cable no. 220 589 00 99 35 at component R39/1 (Vent line heater element).
- Measure resistance with multimeter between sockets 1 and 2
Specified value

- Resistor[12 ...200]ohms
Question

- Is the measurement value OK?







YES
The measurement value is OK.Possible cause and remedy

- 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..
- Test wiring from component N3/9 (CDI control unit) to component R39/1 (Vent line heater element) with an ohmmeter for short circuit (positive or negative) and repair, if necessary.
End of test

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

- Replace component R39/1 (Vent line heater element).
End of test

1.3. Test wiring from component N3/9 (CDI control unit) to component R39/1 (Vent line heater element) with an ohmmeter for short circuit (positive or negative) and repair, if necessary.
Special tools

- Adapter cable220 589 00 99 35
- Test cable 271 589 00 63 00
- Socket box 129 589 00 21 00
Test prerequisite

- The measurement value is not OK.
Test sequence

- Switch off ignition.
- Unplug connector of control module and component.
- Connect 126-pole socket box at engine wiring harness.
- Connect adapter cable no. 220 589 00 99 35 to engine wiring harness R39/1 (Vent line heater element).
- Measure resistance with multimeter between socket [1.91] 91 of the 126-pole socket box tester and socket [R39/1x1] 1
- Measure resistance with multimeter between socket [1.21] 21 of the 126-pole socket box tester and socket [R39/1x1] 2
Specified value:

- Resistance <1 Ohm?
Question

- Are the measurement values OK?


YES
The measurement values are OK.Possible cause and remedy

- 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..
- Test wiring from component N3/9 (CDI control unit) to component R39/1 (Vent line heater element) with an ohmmeter for short circuit (positive or negative) and repair, if necessary.
End of test

NO
The measurement values are not OK.Possible cause and remedy

- Inspect cables and plug connections between component R39/1 (Vent line heater element) and control module N3/9 (CDI control unit) for loose contact, damage and corrosion, repair or replace if necessary.
End of test