Volkswagen Golf / Golf GTI / Golf Variant. Manual — part 166
DTC /
Descrip‐
tion
Monitor
Strategy
Descrip‐
tion
Malfunction Crite‐
ria and Threshold
Value
Secondary Parame‐
ters with Enable
Conditions
Monitor‐
ing Time
Length
MIL Il‐
lum.
Component Diag‐
nostic Procedure
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 accumula‐
ted time engine
load condition vs.
time since engine
start <= 39.84 %
• Determination
engine load con‐
dition:
• Engine load (low‐
er threshold) <=
2.50 %
• engine load (up‐
per threshold) >=
100.00 %
• Ratio accumula‐
ted time high
speed condition
<= 14.84 %
• Determination
high speed condi‐
tion:
• Vehicle speed >
75 mph
• Ratio accumula‐
ted time start-
stop active <=
16.02 %
• Setpoint 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 En‐
gine Tempera‐
ture Control Ac‐
tuator - N493- .
Refer to
– Check the En‐
gine Coolant
Temperature
Sensor - G62- .
Refer to
.
GTI 2014 ➤
Generic Scan Tool - Edition 04.2015
3. Diagnosis and Testing
337
DTC /
Descrip‐
tion
Monitor
Strategy
Descrip‐
tion
Malfunction Crite‐
ria and Threshold
Value
Secondary Parame‐
ters with Enable
Conditions
Monitor‐
ing 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 after en‐
gine start not cali‐
brated [°C]
• And
• AAT sensor sig‐
nal valid
• AAT > -10° C
• Relative actual
MAF > 5.00 %
• ECT @ cylinder
head @ first start
lower limit >= -40°
C
• ECT @ cylinder
head @ first start
upper 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
338
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
Monitor‐
ing 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: ref‐
erence meas‐
uring
• Diff. ECT @ ra‐
diator outlet @
cold start vs.
IAT @ manifold
@ cold start >
25.0 K
• Diff. ECT @ ra‐
diator outlet @
cold start vs.
ECT @ cylin‐
der head
@cold start
n.a. K
• Diff. ECT @ ra‐
diator outlet @
cold start vs.
AAT @ cold
start > 25.0 K
• Min. amount of
faulty refer‐
ence measure‐
ments to detect
defective sen‐
sor 2.00 [-]
• Or
• Low side: refer‐
ence measur‐
ing
• Diff. IAT @
manifold @
cold start vs.
ECT @ radiator
outlet @ cold
start > 25.0 K
• Diff. ECT @
cylinder head
@ cold start vs.
ECT @ radiator
outlet @cold
start n.a. K
• Diff. AAT @
cold start vs.
ECT @ radiator
outlet @ cold
start > 25.0 K
• Min. amount of
faulty refer‐
ence measure‐
ments to detect
defective sen‐
sor 2.00 [-]
• Engine off time
>= 360.00 min
• Engine off time
plausible
• Time after 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 n.a.
K
• Diff. actual vs
previous ECT@
radiator outlet <
256.0 K
• Diff. actual vs
previous AAT <
256.0 K
• For time >= 1.0 s
• Depending on
mean value con‐
dition
• Mean value of all
temperature sen‐
sors @ cold start
>= -256° C
• Number of valid
sensors >= 2.00
[-]
• Depending on
block heater / so‐
lar radiation de‐
tection
• Time after engine
start >= 0.5 s
• Vehicle speed >=
22 mph
• For time >= 20.0 s
• Diff. actual IAT @
manifold vs. min.
IAT @ manifold <
5.0 K
• Diff. actual ECT
@ cylinder head
vs. min. ECT @
cylinder head n.a.
K
• 0.1 s
• Once /
DCY
• 2
DCY
– Check the En‐
gine Coolant
Temperature
Sensor On Radi‐
ator Outlet -
G83- . Refer to
GTI 2014 ➤
Generic Scan Tool - Edition 04.2015
3. Diagnosis and Testing
339
DTC /
Descrip‐
tion
Monitor
Strategy
Descrip‐
tion
Malfunction Crite‐
ria and Threshold
Value
Secondary Parame‐
ters with Enable
Conditions
Monitor‐
ing Time
Length
MIL Il‐
lum.
Component Diag‐
nostic Procedure
• Diff. actual AAT
vs. min. AAT <
4.0 K
• Diff. actual ECT
@ radiator outlet
vs. min. ECT @
radiator outlet <
1.1 K
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
• Con‐
tinu‐
ous
• 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
• IAT @ throttle >=
-33° C
• Time after engine
start > 60 s
• 0.5 s
• Con‐
tinu‐
ous
• 2
DCY
– Check the En‐
gine Coolant
Temperature
Sensor On Radi‐
ator Outlet -
G83- . Refer to
GTI 2014 ➤
Generic Scan Tool - Edition 04.2015
340
Rep. Gr. ST - Generic Scan Tool
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