Volkswagen Golf / Golf GTI / Golf Variant. Service manual - part 201

♦ Return vehicle to Customer.
♦ If all electrical connections are OK:
♦ REPLACE: Engine Control Module - J623- .

Refer to appropriate repair manual.

♦ Repair is complete. Generate Readiness

Code. Refer to

⇒ “1.1 Safety Precautions”, page 2

♦ Return vehicle to Customer.
– NO:

♦ Perform the diagnostic procedure for any

DTC’s.

♦ If no DTC’s return the repair is complete.
♦ Return vehicle to customer.

3.6.10

Engine Coolant Temperature Sensor

On Radiator Outlet - G83- , Checking

General Description
The Engine Coolant Temperature Sensor On Radiator Outlet -

G83- sends information about the current coolant temperature to

the Engine Control Module - J623- . It uses the coolant tempera‐

ture as a correction value for calculating the injection quantity.
Special tools and workshop equipment required
♦ Multimeter.
♦ Wiring Diagram.
♦ Scan Tool.
Test requirements
• Fuses OK.
• Battery voltage OK.
• Switch OFF all electrical and electronic accessories.
• Vehicles with Auto. Transmission, ensure Selector Lever po‐

sition is in “P”.

• Vehicles with Man. Transmission, ensure Shifter Lever posi‐

tion is in “N” with Parking Brake applied.

• Coolant Temperature: ≥ 80° C.

GTI 2014 ➤

Generic Scan Tool - Edition 04.2015

3. Diagnosis and Testing

477

• Observe all safety precautions:

• View clean working conditions:

⇒ “1.2 Clean Working Conditions”, page 3

• For Hybrid vehicles refer to:

⇒ “1.3 High Voltage System General Warnings”, page 4

Test Procedure

Step

Procedure

Result / Action to Take

• PERFORM: Preliminary Check to verify the

customers concern. Refer to

⇒ “3.1 Preliminary Check ”, page 18

– Was Complaint verified?

– YES:

♦ GO TO: Step 2

⇒ page 478

– NO:

♦ GATHER more information from customer

about the complaint.

• IGNITION: OFF.
• DISCONNECT: Engine Coolant Temperature

Sensor On Radiator Outlet - G83- harness con‐

nector.

• CHECK: Engine Coolant Temperature Sensor

On Radiator Outlet - G83- component connec‐

tor terminals 1 to 2 for resistance.

• SPECIFIED VALUE: 2,250 Ω (+/- 750 Ω @ ap‐

prox. 20° C).

– Was Value obtained?

– YES:

♦ GO TO: Step 3

⇒ page 478

– NO:

♦ REPLACE: Engine Coolant Temperature Sen‐

sor On Radiator Outlet - G83- . Refer to appro‐

priate repair manual.

♦ GO TO: Step 4

⇒ page 479

• REMOVE: Engine Control Module - J623- .

Refer to appropriate repair manual.

• CHECK: Engine Coolant Temperature Sensor

On Radiator Outlet - G83- harness connector

terminal 1 to the Engine Control Module - J623-

harness connector T91 / 49 for resistance.

• CHECK: Engine Coolant Temperature Sensor

On Radiator Outlet - G83- harness connector

terminal 2 to the Engine Control Module - J623-

harness connector T91/ 29 for resistance.

• SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω).
– Were Values obtained?

– YES:

♦ GO TO: Step 4

⇒ page 479

– NO:

♦ PERFORM: Visual Inspection of wiring and

component.

♦ CHECK: Wiring for open, high resistance,

short or harness connector for damage, corro‐

sion, loose or broken terminals.

♦ REPAIR: Faulty wiring or connector.
♦ GO TO: Step 4

⇒ page 479

GTI 2014 ➤

Generic Scan Tool - Edition 04.2015

478

Rep. Gr. ST - Generic Scan Tool

Step

Procedure

Result / Action to Take

• Final Procedure
• Perform a road test to verify repair.
– Does the original DTC return?

– YES:

♦ CHECK: Engine Control Module - J623- har‐

ness connector for any damaged, pushed-out

pins.

♦ REPAIR: As necessary.
♦ Clear the DTC’s. Refer to

⇒ “3.3.4 Diagnostic Mode 04 - Erase DTC

Memory”, page 26

♦ Repair is complete. Generate Readiness

Code. Refer to

♦ Return vehicle to Customer.
♦ If all electrical connections are OK:
♦ REPLACE: Engine Control Module - J623- .

Refer to appropriate repair manual.

♦ Repair is complete. Generate Readiness

Code. Refer to

⇒ “1.1 Safety Precautions”, page 2

♦ Return vehicle to Customer.
– NO:

♦ Perform the diagnostic procedure for any

DTC’s.

♦ If no DTC’s return the repair is complete.
♦ Return vehicle to customer.

3.6.11

Engine Speed Sensor - G28- , Checking

General Description
The Engine Speed Sensor - G28- detects rpm and reference

marks from a toothed wheel on the crankshaft. Without an engine

speed signal, the engine will not start. If the engine speed signal

fails while the engine is running, the engine will stop immediately.
Special tools and workshop equipment required
♦ Multimeter.
♦ Wiring Diagram.
♦ Scan Tool.
Test requirements
• Fuses OK.
• Battery voltage OK.
• Switch OFF all electrical and electronic accessories.
• Vehicles with Auto. Transmission, ensure Selector Lever po‐

sition is in “P”.

• Vehicles with Man. Transmission, ensure Shifter Lever posi‐

tion is in “N” with Parking Brake applied.

• Coolant Temperature: ≥ 80° C.
• Observe all safety precautions:

GTI 2014 ➤

Generic Scan Tool - Edition 04.2015

3. Diagnosis and Testing

479

• View clean working conditions:

⇒ “1.2 Clean Working Conditions”, page 3

• For Hybrid vehicles refer to:

⇒ “1.3 High Voltage System General Warnings”, page 4

Test Procedure

Step

Procedure

Result / Action to Take

• PERFORM: Preliminary Check to verify the

customers concern. Refer to

⇒ “3.1 Preliminary Check ”, page 18

– Was Complaint verified?

– YES:

♦ GO TO: Step 2

– NO:

♦ GATHER more information from customer

about the complaint.

• CONNECT: Scan Tool.
• START or CRANK: Engine.
• CHECK: Engine rpm.
• SPECIFIED VALUE: Cranking or Idle rpm.
• IGNITION: OFF.
– Was Value obtained?

– YES:

♦ GO TO: Step 3

– NO:

♦ GO TO: Step 4

• CONDITION: May be intermittent.
• PERFORM: Visual Inspection of wiring and

component.

• CHECK: Wiring for open, high resistance,

short or harness connector for damage, corro‐

sion, loose or broken terminals.

• REPAIR: Faulty wiring or connector.

♦ GO TO: Step 7

• DISCONNECT: Engine Speed Sensor - G28-

harness connector.

• IGNITION: ON.
• CHECK: Engine Speed Sensor - G28- wiring

connector terminals 1 to 3 for voltage.

• SPECIFIED VALUE: About 5.0 V.
• IGNITION: OFF.
– Was Value obtained?

– YES:

♦ GO TO: Step 5

– NO:

♦ GO TO: Step 6

• REMOVE: Engine Control Module - J623- .

Refer to appropriate repair manual.

• CHECK: Engine Speed Sensor - G28- harness

connector terminal 2 to the Engine Control

Module - J623- harness connector T105 / 70

for resistance.

• SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω).
– Was Value obtained?

– YES:

♦ REMOVE: Engine Speed Sensor - G28- . Re‐

fer to appropriate repair manual.

♦ CHECK: Engine Speed Sensor - G28- wheel

for proper seating, damage and/or run - out.

Refer to appropriate repair manual.

♦ Sensor wheel OK
♦ REPLACE: Engine Speed Sensor - G28- . Re‐

fer to appropriate repair manual.

♦ GO TO: Step 7

– NO:

♦ CHECK: Wiring for open, high resistance,

short or harness connector for damage, corro‐

sion, loose or broken terminals.

♦ REPAIR: Faulty wiring or connector.
♦ GO TO: Step 7