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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSVOLKSWAGEN2003GOLF (1J1) L4-1.9L DSL TURBO (ALH)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSFUEL TEMPERATURE SENSOR, CHECKINGWITH GENERIC SCAN TOOL
2003 Volkswagen Golf (1J1) L4-1.9L DSL Turbo (ALH)
With Generic Scan Tool
2003 Volkswagen Golf (1J1) L4-1.9L DSL Turbo (ALH)SECTION With Generic Scan Tool
Fuel Temperature Sensor, Checking
NOTE: Use only gold-plated terminals when servicing terminals in harness connector to injection pump quantity adjuster.
Recommended special tools and equipment
- VAG1526 multimeter or VAG1715 multimeter
- VAG1594 connector test kit
- Wiring diagram
Test requirement
- The respective fuses of Diesel-Direct fuel injection system must be OK:
- Battery voltage must be at least 11.5 Volts.
Test sequence
- Disconnect 10-pin harness connector (arrow) for fuel temperature sensor (harness connector to injection pump quantity adjuster).
- Measure resistance of sensor at connector terminals 4 + 7.
See diagram for specified value
Range A displays resistance values for the temperature range of 0...50 degree C, range B displays resistance values for the temperature range of 50...100 degree C.
Read-out examples:
30 degree C corresponds to a resistance of 1500 to 2000 Ohm
80 degree C corresponds to a resistance of 275 to 375 Ohm
If specified value is not obtained:
- Replace injection pump, item 3. Procedures
- Erase DTC memory of control module for Diesel-Direct fuel injection system, Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
If specified value is obtained:
- Connect test box to control module wiring harness, connect test box for wiring test. Test Box, Connecting For Wiring Test
Vehicles with 80-pin control module
- Check for open circuit in wires between test box and connector according to wiring diagram.
Terminal 4 + socket 76
Terminal 7 + socket 53
Wire resistance: max. 1.5 Ohm
Vehicles with 121-pin control module
- Check for open circuit in wires between test box and connector according to wiring diagram.
Terminal 7 + socket 111
Terminal 4 + socket 103
Wire resistance: max. 1.5 Ohm
Continuation for all vehicles
- Also check wires for short circuit to each other, to vehicle Ground (GND) and to B+.
Specified value: Infinite Ohm
If no malfunctions are detected in wires:
- Replace Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248- Service and Repair
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.