Manufacturer Code Charts: 108200

The lower limit value of component B19 (Catalytic converter temperature sensor) was dropped below/not reached.


Possible cause:

- B19 (Catalytic converter temperature sensor)
Affected functions:

- Power generation

-------------------------------------------------

Test 1: Check component B19 (TWC temperature sensor).

1. Check component B19 (TWC temperature sensor).
Voltage supply of component B19 (Catalytic converter temperature sensor)
Figure legend/figure1

- B19x1 (TWC temperature sensor connector)
- G3/2x1 (O2 sensor upstream TWC connector)
Figure legend/figure2

- B19 (TWC temperature sensor)
Special tool

- Adapter cable220 589 00 99 37
Test sequence

- Switch off ignition.
- Detach coupling at component B19 (Catalytic converter temperature sensor).
- Connect adapter cable no. 220 589 00 99 37 to engine wiring harness B19 (Catalytic converter temperature sensor).
- Measure direct voltage with multimeter between sockets (B19x1) 1 and (B19x1) 2
- Switch on ignition.
Specified value

- Voltage[4,75...5,25V]
Question

- Is the measurement value OK?













YES
Check signal lines on component B19 (Catalytic converter temperature sensor).
Test prerequisite

- The power supply of component B19 (Catalytic converter temperature sensor) is OK.
Figure legend/figure1

- B19x1 (TWC temperature sensor connector)
- G3/2x1 (O2 sensor upstream TWC connector)
Figure legend/figure2

- B19 (TWC temperature sensor)
Special tool

- Adapter cable220 589 00 99 37
- Test cable 271 589 00 63 00
- Socket box 129 589 00 21 00
Test sequence

- Switch off ignition.
- Detach coupling at component B19 (Catalytic converter temperature sensor).
- Connect adapter cable no. 220 589 00 99 37 to engine wiring harness B19 (Catalytic converter temperature sensor).
- Connect 126-pole socket box at engine wiring harness.
- Measure resistance with multimeter between socket (M.65) 65 of the 126-pole socket box tester and (B19x1) 1
- Measure resistance with multimeter between socket (M.84) 84 of the 126-pole socket box tester and (B19x1) 2
Specified value

- Resistance in Ohms< 1ohms
Question

- Is the measurement value OK?













YES
Check internal resistance of component B19 (Catalytic converter temperature sensor).
Test prerequisite

- Please only perform this test when engine is cold.
Figure legend/figure1

- B19x1 (TWC temperature sensor connector)
- G3/2x1 (O2 sensor upstream TWC connector)
Figure legend/figure2

- B19 (TWC temperature sensor)
Special tool

- Adapter cable220 589 00 99 37
Test sequence

- Switch off ignition.
- Connect adapter cable to component B19 (Catalytic converter temperature sensor).
- Test resistance.
- Measure resistance with multimeter between sockets (B19x1) 1 and (B19x1) 2
Specified value

- Resistor[ 25°C : 215 ... 225]ohms
- Resistor[ 50°C : 235 ... 245]ohms
Question

- Are the measurement values OK?













YES
The measurement value is OK.Inspect wiring and plug connections between N3/9 (CDI control unit) and control unit B19 (Catalytic converter temperature sensor) for corrosion, loose contacts and damage.Test wiring and plug connections between control module N3/9 (CDI control unit) and B19 (Catalytic converter temperature sensor) for Short circuit and Open circuit, repair or replace if necessary.Continue with button F2

Test wiring/ plug connections ?
Question

- Was the line test OK?


YES
The line test was OK.Replace component B19 (Catalytic converter temperature sensor).

NO
The line test was not OK.Possible cause and remedy

- Repair wiring.


NO
The measurement value is not OK.Replace component B19 (Catalytic converter temperature sensor).End of test

NO
The measurement value is not OK.Inspect wiring and plug connections between N3/9 (CDI control unit) and control unit B19 (Catalytic converter temperature sensor) for corrosion, loose contacts and damage.Test wiring and plug connections between control module N3/9 (CDI control unit) and B19 (Catalytic converter temperature sensor) for Short circuit and Open circuit, repair or replace if necessary.Continue with button F2

Test wiring/ plug connections ?
Question

- Was the line test OK?


YES
Check internal resistance of component B19 (Catalytic converter temperature sensor).
Test prerequisite

- Please only perform this test when engine is cold.
Figure legend/figure1

- B19x1 (TWC temperature sensor connector)
- G3/2x1 (O2 sensor upstream TWC connector)
Figure legend/figure2

- B19 (TWC temperature sensor)
Special tool

- Adapter cable220 589 00 99 37
Test sequence

- Switch off ignition.
- Connect adapter cable to component B19 (Catalytic converter temperature sensor).
- Test resistance.
- Measure resistance with multimeter between sockets (B19x1) 1 and (B19x1) 2
Specified value

- Resistor[ 25°C : 215 ... 225]ohms
- Resistor[ 50°C : 235 ... 245]ohms
Question

- Are the measurement values OK?













YES
The measurement value is OK.Inspect wiring and plug connections between N3/9 (CDI control unit) and control unit B19 (Catalytic converter temperature sensor) for corrosion, loose contacts and damage.Test wiring and plug connections between control module N3/9 (CDI control unit) and B19 (Catalytic converter temperature sensor) for Short circuit and Open circuit, repair or replace if necessary.Continue with button F2

Test wiring/ plug connections ?
Question

- Was the line test OK?


YES
The line test was OK.Replace component B19 (Catalytic converter temperature sensor).

NO
The line test was not OK.Possible cause and remedy

- Repair wiring.


NO
The measurement value is not OK.Replace component B19 (Catalytic converter temperature sensor).End of test

NO
The line test was not OK.Possible cause and remedy

- Repair wiring.


NO
The measurement value is not OK.Inspect wiring and plug connections between N3/9 (CDI control unit) and control unit B19 (Catalytic converter temperature sensor) for corrosion, loose contacts and damage.Test wiring and plug connections between control module N3/9 (CDI control unit) and B19 (Catalytic converter temperature sensor) for Short circuit and Open circuit, repair or replace if necessary.Continue with button F2

Test wiring/ plug connections ?
Question

- Was the line test OK?


YES
Check signal lines on component B19 (Catalytic converter temperature sensor).
Test prerequisite

- The power supply of component B19 (Catalytic converter temperature sensor) is OK.
Figure legend/figure1

- B19x1 (TWC temperature sensor connector)
- G3/2x1 (O2 sensor upstream TWC connector)
Figure legend/figure2

- B19 (TWC temperature sensor)
Special tool

- Adapter cable220 589 00 99 37
- Test cable 271 589 00 63 00
- Socket box 129 589 00 21 00
Test sequence

- Switch off ignition.
- Detach coupling at component B19 (Catalytic converter temperature sensor).
- Connect adapter cable no. 220 589 00 99 37 to engine wiring harness B19 (Catalytic converter temperature sensor).
- Connect 126-pole socket box at engine wiring harness.
- Measure resistance with multimeter between socket (M.65) 65 of the 126-pole socket box tester and (B19x1) 1
- Measure resistance with multimeter between socket (M.84) 84 of the 126-pole socket box tester and (B19x1) 2
Specified value

- Resistance in Ohms< 1ohms
Question

- Is the measurement value OK?













YES
Check internal resistance of component B19 (Catalytic converter temperature sensor).
Test prerequisite

- Please only perform this test when engine is cold.
Figure legend/figure1

- B19x1 (TWC temperature sensor connector)
- G3/2x1 (O2 sensor upstream TWC connector)
Figure legend/figure2

- B19 (TWC temperature sensor)
Special tool

- Adapter cable220 589 00 99 37
Test sequence

- Switch off ignition.
- Connect adapter cable to component B19 (Catalytic converter temperature sensor).
- Test resistance.
- Measure resistance with multimeter between sockets (B19x1) 1 and (B19x1) 2
Specified value

- Resistor[ 25°C : 215 ... 225]ohms
- Resistor[ 50°C : 235 ... 245]ohms
Question

- Are the measurement values OK?













YES
The measurement value is OK.Inspect wiring and plug connections between N3/9 (CDI control unit) and control unit B19 (Catalytic converter temperature sensor) for corrosion, loose contacts and damage.Test wiring and plug connections between control module N3/9 (CDI control unit) and B19 (Catalytic converter temperature sensor) for Short circuit and Open circuit, repair or replace if necessary.Continue with button F2

Test wiring/ plug connections ?
Question

- Was the line test OK?


YES
The line test was OK.Replace component B19 (Catalytic converter temperature sensor).

NO
The line test was not OK.Possible cause and remedy

- Repair wiring.


NO
The measurement value is not OK.Replace component B19 (Catalytic converter temperature sensor).End of test

NO
The measurement value is not OK.Inspect wiring and plug connections between N3/9 (CDI control unit) and control unit B19 (Catalytic converter temperature sensor) for corrosion, loose contacts and damage.Test wiring and plug connections between control module N3/9 (CDI control unit) and B19 (Catalytic converter temperature sensor) for Short circuit and Open circuit, repair or replace if necessary.Continue with button F2

Test wiring/ plug connections ?
Question

- Was the line test OK?


YES
Check internal resistance of component B19 (Catalytic converter temperature sensor).
Test prerequisite

- Please only perform this test when engine is cold.
Figure legend/figure1

- B19x1 (TWC temperature sensor connector)
- G3/2x1 (O2 sensor upstream TWC connector)
Figure legend/figure2

- B19 (TWC temperature sensor)
Special tool

- Adapter cable220 589 00 99 37
Test sequence

- Switch off ignition.
- Connect adapter cable to component B19 (Catalytic converter temperature sensor).
- Test resistance.
- Measure resistance with multimeter between sockets (B19x1) 1 and (B19x1) 2
Specified value

- Resistor[ 25°C : 215 ... 225]ohms
- Resistor[ 50°C : 235 ... 245]ohms
Question

- Are the measurement values OK?













YES
The measurement value is OK.Inspect wiring and plug connections between N3/9 (CDI control unit) and control unit B19 (Catalytic converter temperature sensor) for corrosion, loose contacts and damage.Test wiring and plug connections between control module N3/9 (CDI control unit) and B19 (Catalytic converter temperature sensor) for Short circuit and Open circuit, repair or replace if necessary.Continue with button F2

Test wiring/ plug connections ?
Question

- Was the line test OK?


YES
The line test was OK.Replace component B19 (Catalytic converter temperature sensor).

NO
The line test was not OK.Possible cause and remedy

- Repair wiring.


NO
The measurement value is not OK.Replace component B19 (Catalytic converter temperature sensor).End of test

NO
The line test was not OK.Possible cause and remedy

- Repair wiring.


NO
The line test was not OK.Possible cause and remedy

- Repair wiring.