Content .. 119 120 121 122 ..

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

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°

• 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

– 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°

• For time >= 0.0

• 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

Content .. 119 120 121 122 ..