Volkswagen Golf / Golf GTI / Golf Variant. Manual — part 126
DTC /
Descrip‐
tion
Monitor
Strategy
Descrip‐
tion
Malfunction Crite‐
ria and Threshold
Value
Secondary Parame‐
ters with Enable
Conditions
Monitoring
Time
Length
MIL Il‐
lum.
Component Diag‐
nostic Procedure
P2251
O2 Sen‐
sor Neg‐
ative
Current
Control
Circuit/
Open
Bank 1
Sensor
1
Oxygen
Sensors
Front
Open Cir‐
cuit Virtu‐
al Ground
(VG)
• Nernst voltage
(VN) > 4.40 V
• Or
• Diff. pump volt‐
age (VIP) vs.
virtual ground
voltage (VG) >
2.35 V
• Ddiff. pump
voltage (VIP)
vs. virtual
ground voltage
(VG) < -2.35 V
• Or
• Diff. nernst
voltage (VN)
vs. virtual
ground voltage
(VG) > 1.60 V
• Diff. nernst
voltage (VN)
vs. virtual
ground voltage
(VG) < -0.10 V
• Or
• Pump current >
0.0115 A
• Or
• Measurement
WRAF sensor
label resistor >
n.a. Ohm
• And
• Choice of:
• Diff. pump volt‐
age (VIP) vs.
virtual ground
voltage (VG)
<= 1.20 V
• Diff. nernst
voltage (VN)
vs. virtual
ground voltage
(VG) <= 1.20 V
• O2S front (linear)
ready
• Measurement of
WRAF sensor la‐
bel resistor finish‐
ed
• Pump current
controller active
• 2.3 s
• Contin‐
uous
• 2
DCY
– Check the Oxy‐
gen Sensor 1
Before Catalytic
Converter -
GX10- . Refer to
GTI 2014 ➤
Generic Scan Tool - Edition 04.2015
3. Diagnosis and Testing
177
DTC /
Descrip‐
tion
Monitor
Strategy
Descrip‐
tion
Malfunction Crite‐
ria and Threshold
Value
Secondary Parame‐
ters with Enable
Conditions
Monitoring
Time
Length
MIL Il‐
lum.
Component Diag‐
nostic Procedure
P2257
AIR Sys‐
tem
Control
"A" Cir‐
cuit Low
Secon‐
dary Air
Injection
Pump
Relay
Short To
Ground
• Output voltage
(hardware val‐
ues) 1.92 –
2.21 V
• Engine running
• Actuator com‐
manded off
• 1.0 s
• Contin‐
uous
• 2
DCY
– Check the Sec‐
ondary Air Injec‐
tion Pump Motor
- V101- / Secon‐
dary Air Injection
Pump Relay -
J299- . Refer to
.
P2258
AIR Sys‐
tem
Control
"A" Cir‐
cuit High
Secon‐
dary Air
Injection
Pump
Relay
Short To
Battery
Plus
• Actuator tem‐
perature > 160
– 200° C
• Or
• Output current
(hardware val‐
ues) > 1.0 – 2.0
A
• Engine running
• Actuator com‐
manded on
• 1.0 s
• Contin‐
uous
• 2
DCY
– Check the Sec‐
ondary Air Injec‐
tion Pump Motor
- V101- / Secon‐
dary Air Injection
Pump Relay -
J299- . Refer to
.
GTI 2014 ➤
Generic Scan Tool - Edition 04.2015
178
Rep. Gr. ST - Generic Scan Tool
DTC /
Descrip‐
tion
Monitor
Strategy
Descrip‐
tion
Malfunction Crite‐
ria and Threshold
Value
Secondary Parame‐
ters with Enable
Conditions
Monitoring
Time
Length
MIL Il‐
lum.
Component Diag‐
nostic Procedure
P2270
O2 Sen‐
sor Sig‐
nal
Biased/
Stuck
Lean
Bank 1
Sensor
2
Oxygen
Sensors
Rear Sig‐
nal
Range
Check
• Max. O2S rear
voltage < 0.87
V
• General condi‐
tions:
• Close the gap
stimulation re‐
quest active
• Vehicle speed >=
6 mph
• Catalyst over‐
heating protec‐
tion not active
• Turbine over‐
heating protec‐
tion not active
• O2S rear ready
• O2S front ready
• ECT @ cylinder
head > 60° C
• Modeled catalyst
temperature 470
– 780° C
• Difference be‐
tween dynamic
and stationary
catalyst tempera‐
ture -306 – 304° C
• Modeled catalyst
temperature once
after engine start
> 550° C
• Integrated MAF,
catalyst temp.
conditions fulfil‐
led >= 0.0 g
• Modeled EGT @
O2S rear <= 900°
C
• MAF per cylinder
30.0 – 200.0 kg/h
• MAF per cylinder
per stroke, lower
range >= 89.99
mg/rev
• MAF per cylinder
per stroke, upper
range <= 750.0
mg/rev
• And
• Low dynamic
conditions devia‐
tion actual
• And
• 60.0 –
70.0 s
• Once /
DCY
• 2
DCY
– Check the Oxy‐
gen Sensor 1 Af‐
ter Catalytic
Converter -
GX7- . Refer to
GTI 2014 ➤
Generic Scan Tool - Edition 04.2015
3. Diagnosis and Testing
179
DTC /
Descrip‐
tion
Monitor
Strategy
Descrip‐
tion
Malfunction Crite‐
ria and Threshold
Value
Secondary Parame‐
ters with Enable
Conditions
Monitoring
Time
Length
MIL Il‐
lum.
Component Diag‐
nostic Procedure
• Target engine
speed < 150 RPM
• Dynamic MAF <
15.01 mg/rev
• Dynamic lambda
controller output
<= 20.0 %
• And
• Integrated MAF
after dynamic
conditions are ful‐
filled > 20.0 g
• Time after a cata‐
lyst purge phase
>= 1.0 s
• O2S rear voltage
@ diagnosis start
>= 0.55 V
• Integrated MAF
to start diagnosis
>= 5.0 g
• Integrated heat
energy >= 800.0
– 2,000.0 kJ
• Engine speed
1,248 – 3,008
RPM
• Coasting function
n.a
• O2S heater rear
active
• Lambda adapta‐
tion not active
• Valve lift n.a.
• And
• Depending on
lambda control:
• Intervention of
trim control be‐
havior activation
of catalyst diag‐
nosis < 0.10 [-]
• Or
• Intervention of
trim control dur‐
ing active catalyst
diagnosis < 0.20
[-]
• Depending on
canister purge:
GTI 2014 ➤
Generic Scan Tool - Edition 04.2015
180
Rep. Gr. ST - Generic Scan Tool
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