Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSVOLKSWAGEN2002GOLF GLS, 2.0 K, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 100 (2.8L - FUEL INJECTION IGNITION, ENGINE CODE(S): AFP (A4 PLATFORM))01 ON BOARD DIAGNOSTIC (OBD)READ MEASURING VALUE BLOCK (SCAN TOOL FUNCTION 08)READ MEASURING VALUE BLOCK, EVALUATINGEVALUATING DISPLAY GROUP 000

2002 Volkswagen Golf GLS, 2.0 K, Standard

Evaluating display group 000

2002 Volkswagen Golf GLS, 2.0 K, StandardSECTION Evaluating display group 000

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 Volkswagen Jetta, 2002 Volkswagen GTI, 2001 Volkswagen Jetta, 2001 Volkswagen GTI, and 2000 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

Engine coolant temperature
Display field: 1	Possible malfunction cause	Corrective action
Less than 185	Engine too cold	If necessary, perform test drive.
	Engine Coolant Temperature (ECT) sensor or wiring to ) Motronic Engine Control Module (ECM J220	Check ECT sensor → Engine Coolant Temperature (ECT) sensor, checking .
Greater than 215	Radiator dirty	Clean radiator.
	Radiator coolant fan not functioning	Check radiator coolant fan. → 19 - ENGINE - COOLING SYSTEM
	Thermostat malfunctioning	Check thermostat. → 19 - ENGINE - COOLING SYSTEM
	Engine Coolant Temperature (ECT) sensor or wiring to Motronic ECM J220	Check ECT sensor → Engine Coolant Temperature (ECT) sensor, checking .

Engine speed (at idle)
Display field: 3	Possible malfunction cause	Corrective action
Less than 16	Throttle valve control module sticking or malfunctioning	Check throttle valve control module → Throttle valve control module J338 , checking . Perform idle speed check → Idle speed, checking .
Greater than 18	Throttle valve control module sticking or malfunctioning Large amount of unmetered air (cannot be compensated for by the idle stabilization)	Check throttle valve control module → Throttle valve control module J338 , checking . Check intake air system for leaks → Intake air system, checking for leaks (unmetered air) . Perform idle speed check → Idle speed, checking .

Motronic Engine Control Module (ECM) J220 supply voltage
Display field: 4	Possible malfunction cause	Corrective action
Less than 170	Generator malfunctioning	Check Generator. Electrical Wiring Diagrams, Troubleshooting Component Locations
	Battery heavily discharged	Check battery (B+) voltage/charge battery. → 27 BATTERY, STARTER, GENERATOR, CRUISE CONTROL
	Battery heavily loaded shortly after starting due to high charging current and electrical consumers	Increase revs slightly for a few minutes and switch off electrical consumers.
	Transfer resistance in the current supply or the Motronic Engine Control Module (ECM) J220 Ground (GND) connection	Check Motronic Engine Control Module (ECM) J220 voltage supply → Engine Control Module (ECM) voltage supply, checking .
	Current draw when ignition is off	Eliminate current draw.
Greater than 213	Voltage regulator on generator malfunctioning	Check voltage regulator and replace if necessary.
	Excess voltage due to jump starting or quick charging unit	Check DTC memory → Diagnostic Trouble Code (DTC) memory, checking and erasing (scan tool functions 02 and 05) .

Throttle valve angle
Display field: 5	Possible malfunction cause	Corrective action
Less than 0	Not possible	---
Greater than 13	Motronic Engine Control Module (ECM) J220 not adapted to throttle valve control module Throttle valve sticking Throttle body in area of throttle valve very dirty	Adapt Motronic Engine Control Module (ECM) J220 to throttle valve control module → Engine Control Module (ECM) to throttle valve control module, adaptation . Check visually and if necessary, eliminate problem.

Idle speed control/Idle stabilization learned value
Display field: 6	Possible malfunction cause	Corrective action
Less than 103	Unmetered air after throttle valve	Check intake air system for leaks → Intake air system, checking for leaks (unmetered air) .
Greater than 180	Excessive engine load	Switch off electrical consumers.
	Throttle valve mechanism sticking Throttle body in area of throttle valve heavily soiled	Check visually and if necessary, eliminate problem.

Idle speed control/Idle stabilization learned value
Display field: 7	Possible malfunction cause	Corrective action
Less than 103	Unmetered air after throttle valve	Check intake air system for leaks → Intake air system, checking for leaks (unmetered air) .
Greater than 153	Excessive engine load	Switch off electrical consumers.
	Throttle valve mechanism sticking Throttle body in area of throttle valve heavily soiled	Check visually and if necessary, eliminate problem.

Oxygen Sensor O2S control value, Bank 1
Display field: 8	Possible Malfunction cause	Corrective action
Less than 116	Engine too rich, Oxygen Sensor O2S control weakens mixture Oxygen Sensor O2S control at limit Lots of fuel from Evaporative Emission (EVAP)	Check oxygen sensor and Oxygen Sensor 2S control before Three way Catalytic Converter (TWC) → Oxygen sensor and oxygen sensor control before Three Way Catalytic Converter (TWC), checking .
	Fuel pressure regulator malfunctioning/hose fallen off	Check fuel pressure regulator → Fuel pressure regulator and residual pressure, checking .
	Fuel injector malfunctioning	Check fuel injectors → Fuel injectors, checking .
	Mass Air Flow (MAF) sensor malfunctioning	Check Mass Air Flow (MAF) sensor → Mass Air Flow (MAF) Sensor G70 , checking .
More than 140	Engine too lean, Oxygen Sensor O2S control richens mixture Oxygen sensor O2S control at limit	Check oxygen sensor and Oxygen Sensor O2S control before Three way Catalytic Converter (TWC) → Oxygen sensor and oxygen sensor control before Three Way Catalytic Converter (TWC), checking .
	Unmetered air	Check intake air system for leaks → Intake air system, checking for leaks (unmetered air) .
	Fuel injector malfunctioning	Check fuel injectors → Fuel injectors, checking .
	Mass Air Flow (MAF) sensor malfunctioning	Check Mass Air Flow (MAF) sensor → Mass Air Flow (MAF) Sensor G70 , checking .
	Secondary Air Injection (AIR) system leaking	Check Secondary Air Injection (AIR) system. → 26 - EXHAUST SYSTEM, EMISSION CONTROLS

Oxygen Sensor O2S control value, Bank 1
Display field: 8	Possible Malfunction cause	Corrective action
Constant 128	Oxygen Sensor O2S control blocked	Check oxygen sensor and Oxygen Sensor O2S control before Three way Catalytic Converter (TWC) → Oxygen sensor and oxygen sensor control before Three Way Catalytic Converter (TWC), checking .
Oxygen Sensor O2S control additive learned value
Display field: 9	Possible Malfunction cause	Corrective action
Less than 112 or more than 144	Evaluating display group 32.
Oxygen sensor control multiplicative learned value
Display field: 10	Possible Malfunction cause	Corrective action
Less than 116 or more than 140	Evaluating display group 32.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.