Volkswagen Golf / Golf GTI / Jetta. Manual — part 171

01-226

Display group 34 - Oxygen Sensor (O2S) control - Oxygen Sensor (O2S) aging
diagnosis of Oxygen Sensor (O2S) before Three Way Catalytic Converter (TWC)

Control module in function "04-Basic setting"

Vehicle stationary, engine running at increased idle speed (only with depressed

brake pedal and accelerator)

System in basic
setting 34

Indicated on display

xxxx
rpm

xxx.x

C

x.xx Text

1

2

3

4

Display zones

Specification Evaluation

Result of Oxygen Sensor
(O2S) before Three Way
Catalytic Converter (TWC)
aging test

(Test OFF / Test ON / B1
P1 OK. / B1 P1 n.OK.)

B1 P1 OK.

Page 01-

227

Dynamic factor of Oxygen Sensor
(O2S) before Three Way Catalytic
Converter (TWC)

1.00...2.50

---

Three Way Catalytic Converter (TWC)
temperature

min. 380.0 C

---

Engine speed

Approx. 2300

rpm

---

Note on display zone 2:

Value calculated from engine speed and engine load.

Measured value (data) blocks

01-227

Evaluation of display group 34, display zone 4 - Oxygen Sensor (O2S) diagnosis -
Oxygen Sensor (O2S) aging before Three Way Catalytic Converter (TWC)

Appears on display

Possible cause

Corrective action

Oxygen Sensor (O2S)
before Three Way
Catalytic Converter
(TWC) not OK.: "B1 P1
n.OK.

DTC stored in DTC

memory

- Check DTC memory

Page

01-23

, DTC memory, checking

and erasing

Oxygen Sensor

(O2S) faulty before
Three Way Catalytic
Converter (TWC)

- Perform a road test to remove
possible residue on Oxygen
Sensor (O2S) and repeat
check.

- Perform diagnosis again if
result is same:

- Check Oxygen Sensor (O2S)
and Oxygen Sensor (O2S)
control before Three Way
Catalytic Converter (TWC)

Page 24-131

Measured value (data) blocks

01-228

Display group 36 - Oxygen Sensor (O2S) control - Oxygen Sensor (O2S)
diagnosis after Three Way Catalytic Converter (TWC) (operational readiness)

Control module in function "04-Basic setting"

Engine running at idle

System in basic
setting 36

Indicated on

display

x.xxx

V

Text ---

---

1

2

3

4

Display zones

Specification

Evaluation

No display

---

---

No display

---

---

Result of operational readiness of
Oxygen Sensor (O2S) after
Three Way Catalytic Converter
(TWC)

(Test OFF / Test ON / B1 P2
OK. / B1 P2 n.OK.)

B1 P2 OK.

Page 01-230

Oxygen Sensor (O2S) voltage, Oxygen
Sensor (O2S) after Three Way Catalytic
Converter (TWC)

0.100...0.900 V

Page 01-229

Measured value (data) blocks

01-229

Evaluating display group 36, display zone 1 - Oxygen Sensor (O2S)
voltage,Oxygen Sensor (O2S) after Three Way Catalytic Converter (TWC)

Appears on

display

Possible cause

Corrective action

Constant 1.100

V

Short to positive via: Oxygen

Sensor (O2S), sensor wiring,
Ground (GND) wiring, Motronic
Engine Control Module (ECM) -
J220-

- Check basic voltage of
Oxygen Sensor (O2S) after
Three Way Catalytic
Converter (TWC)

Page

24-146

Constant 0.000

V

Short to Ground (GND) via:

Oxygen Sensor (O2S), sensor
wiring, Ground (GND) wiring,
Motronic Engine Control Module
(ECM) -J220-

- Check Oxygen Sensor
(O2S) wiring after Three
Way Catalytic Converter
(TWC)

Page 24-148

Constant

between

0.400...0.500 V

Wiring open circuit via: Oxygen

Sensor (O2S), sensor wiring,
Ground (GND) wiring, Motronic
Engine Control Module (ECM) -
J220-

Measured value (data) blocks