Volkswagen Golf / Golf GTI / Golf Variant. Manual — part 121
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
P2178
System
Too
Rich Off
Idle
Bank 1
Fuel Sys‐
tem Di‐
rect Fuel
Injection
System
Too Rich
• Adaptive value
<= -30.0 %
• Barometric pres‐
sure > 73.0 kPa
• MAF > 60.0 mg/
rev
• Engine speed >
576 RPM
• ECT @ cylinder
head > 20° C
• IAT @ manifold >
-48° C
• AAT > -48° C
• Lambda set point
0.95 – 1.05 [-]
• Lambda control
closed loop
• Integrated MAF
>= 5.0 – 200.0 g
• Lambda adapta‐
tion active
• Vehicle speed < 4
mph
• Driver request
low dynamics
• And
• Mass fuel flow
lower range >
0.00 mg/rev
• Mass fuel flow
upper range <
0.00 – 17.74 mg/
rev
• Or
• Evap purge valve
closed
• Or
• Canister load <=
1.20 [-]
• Evap purge flow
at max. value
• Or
• Dependence on
canister purge
min:
• Lower limit of
lambda controller
output n.a.
• Or
• 5.0 s
• Contin‐
uous
• 2
DCY
– Check the Evap‐
orative Emission
(EVAP) System
visually for con‐
tamination.
– Check the Oxy‐
gen Sensor 1
Before Catalytic
Converter -
GX10- . Refer to
– Check the Oxy‐
gen Sensor 1 Af‐
ter Catalytic
Converter -
GX7- . Refer to
– Check the In‐
take Manifold
Sensor - GX9- .
Refer to
– Check the Fuel
Injectors . Refer
to
GTI 2014 ➤
Generic Scan Tool - Edition 04.2015
3. Diagnosis and Testing
157
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
• Upper limit of
lambda controller
output n.a.
• And
• Evap purge flow
at min. value
P2181
Cooling
System
Per‐
for‐
mance
Engine
Cooling
System
Rationali‐
ty Check
• Modeled ECT
@ cylinder
head > 66 – 70°
C
• Choice of:
• ECT @ cylin‐
der head < 65 –
69° C
• Or
• ECT @ radiator
outlet < n.a.° C
• ECT @ cylinder
head @ first start
>= -10° C
• ECT @ cylinder
head @ first start
<= 50 – 55° C
• AAT > -10° C
• Ratio fuel cut off
<= 10.16 %
• Ratio engine load
time <= 39.84 %
• Ratio maximum
vehicle speed <=
14.84 %
• Ratio start-stop
time <= 16.02 %
• Set point of RVC
in measurement
window < 99.61
%
• Case 1:
• Engine speed <
8,160 RPM
• Case 2:
• Engine speed >=
8,160 RPM
• Diff. ECT@ cylin‐
der head during
measurement <
256° C
• For time >= 0.0 s
• 1.0 s
• Once /
DCY
• 2
DCY
– Check cooling
system visually
for leaks or dam‐
aged compo‐
nents.
– Check the cool‐
ant thermostat
and the Engine
Temperature
Control Actuator
- N493- . Refer
to
.
– Check the En‐
gine Coolant
Temperature
Sensor - G62- .
Refer to
.
GTI 2014 ➤
Generic Scan Tool - Edition 04.2015
158
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
Electrical
Thermo‐
stat Ra‐
tionality
Check
• ECT @ cylin‐
der head < 60°
C
• For time >= 0.0
s
• Engine running
• Or
• Engine stopped
• And
• ECT @ cylinder
head once after
start > 65° C
• Or
• ECT @ radiator
outlet n.a.
• And
• AAT sensor sig‐
nal valid
• AAT > -10° C
• Relative actual
MAF > 5.00 %
• ECT @ cylinder
head @ first start
lower limit <=
215° C
• Vehicle speed >=
0 mph
• Modeled ECT @
cylinder head >
60° C
• Start-stop cycles
<= 255.00 [-]
• For time >= 15.0 s
GTI 2014 ➤
Generic Scan Tool - Edition 04.2015
3. Diagnosis and Testing
159
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
P2183
Engine
Coolant
Temper‐
ature
Sensor
2 Circuit
Range/
Per‐
for‐
mance
Engine
Coolant
Tempera‐
ture Sen‐
sor @
Radiator
Outlet
Cross
Check
• High side:
• Diff. ECT @ ra‐
diator outlet @
cold start vs.
IAT @ manifold
@ cold start >
25.0 K
• Diff. ECT @ ra‐
diator outlet @
cold start vs.
AAT @ cold
start > 25.0 K
• Or
• Low side:
• Diff. IAT @
manifold @
cold start vs.
ECT @ radiator
outlet @ cold
start > 25.0 K
• Diff. AAT @
cold start vs.
ECT @ radiator
outlet @ cold
start > 25.0 K
• Engine off time
>= 360.0 min
• Engine off time
plausible time af‐
ter engine start
<= 1,400.0 s
• Depending on
temperature
slope diff. actual
vs previous IAT <
256.0 K
• Diff. actual vs
previous ECT @
cylinder head <
256.0 K
• Diff. actual vs
previous ECT @
radiator outlet <
256.0 K
• Diff. actual vs
previous AAT <
256.0 K
• For time >= 1.0 s
• 0.1 s
• Once /
DCY
• 2
DCY
– Check the En‐
gine Coolant
Temperature
Sensor On Radi‐
ator Outlet -
G83- . Refer to
.
P2184
Engine
Coolant
Temper‐
ature
Sensor
2 Circuit
Low
Engine
Coolant
Tempera‐
ture Sen‐
sor @
Radiator
Outlet
Short To
Ground
• Sensor voltage
< 0.30 V
• 0.5 s
• Contin‐
uous
• 2
DCY
– Check the En‐
gine Coolant
Temperature
Sensor On Radi‐
ator Outlet -
G83- . Refer to
.
P2185
Engine
Coolant
Temper‐
ature
Sensor
2 Circuit
High
Engine
Coolant
Tempera‐
ture Sen‐
sor @
Radiator
Outlet
Short To
Battery /
Open Cir‐
cuit
• Sensor voltage
> 4.90 V
• Modeled IAT @
throttle >= -33° C
• Time after engine
start > 60.0 s
• 0.5 s
• Contin‐
uous
• 2
DCY
– Check the En‐
gine Coolant
Temperature
Sensor On Radi‐
ator Outlet -
G83- . Refer to
.
GTI 2014 ➤
Generic Scan Tool - Edition 04.2015
160
Rep. Gr. ST - Generic Scan Tool
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