Content .. 164 165 166 167 ..

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°

• 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°

• For time >= 0.0

• 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°

• 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.

• 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.

• 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

Content .. 164 165 166 167 ..