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 VARIANT/TRIMSECTION 17 (1.9L - TDI AND TDI PD GENERIC SCAN TOOL, ENGINE CODE(S): ALH, BEW (A4 PLATFORM))23 DIESEL FUEL INJECTIONCHECKING COMPONENTSCOLD START INJECTOR, CHECKINGTEST SEQUENCE

2002 Volkswagen Golf GLS, 2.0 K, Standard

Test sequence

2002 Volkswagen Golf GLS, 2.0 K, StandardSECTION Test sequence

WARNING: This page is about a different variant/trim than selected.

Fig 1: Fuel Injection Pump

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect 10-pin harness connector for quantity adjuster (harness connector to injection pump quantity adjuster) (arrow).

Fig 2: 10-Pin Connector & Terminals

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Measure resistance between terminals 9 + 10 on connector.

Specified value: 12 to 20 Ω

If specified value is not obtained:

Replace Cold Start Injector -N108-. Refer to item 17 in Injection pump, servicing .
Erase DTC memory of control module for Diesel-Direct fuel injection system. Refer to Diagnostic mode 4: Reset/erase diagnostic data .
Generate readiness code.

If specified value is obtained:

Connect test box to control module wiring harness. Refer to Test box, connecting for wiring test .

Vehicles with 80-pin control module

Fig 3: 10-Pin Electrical Harness Connector & Terminals

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Check wires between test box and 10-pin connector for open circuit according to wiring diagram.

Terminal 9 + socket 79

Terminal 10 + socket 2

Terminal 10 + socket 28

Wire resistance: max. 1.5 Ω

Vehicles with 121-pin control module

Fig 4: 10-Pin Electrical Harness Connector & Terminals

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Check wires between test box and 10-pin connector for open circuit according to wiring diagram.

Terminal 9 + socket 114

Terminal 10 + socket 1 and 2

Wire resistance: max. 1.5 Ω

Continue for all vehicles

Check wires for short circuit to each other, to vehicle Ground (GND) and to B+.

Specified value: ∞ Ω

If no malfunctions are found in wires:

Replace Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248-. Refer to Control module for Diesel-Direct Fuel Injection System, replacing .
Generate readiness code.

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.