Fuel Temperature Sensor, Checking

NOTE:

Cylinder bank 1 is located in direction of travel, right.

Cylinder bank 2 is located in direction of travel, left.

Use only gold-plated terminals when servicing terminals in harness connector.

Special tools and workshop equipment required

Multimeter VAG1526 or Multimeter VAG1715
Connector test kit VAG1594
Wiring diagram

Test Prerequisites

Fuses in E-box (plenum chamber, left) must be OK: Refer to SYSTEM WIRING DIAGRAM

Fig 1: Identifying Fuse Holder
Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
Battery voltage must be at least 11.5 volts.
Ignition is switched off.

Fuel Temperature Sensor 1, Test Sequence

-- Disconnect 2-pin connector from Fuel Temperature Sensor -G81-, refer to item: 8.

-- Measure resistance between terminals on sensor.

See diagram for specified value

Fig 2: Identifying Temperature & Resistance Values Graph

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Range A displays resistance values for the temperature range of 0 to 65 °C, range B displays resistance values for the temperature range of 65 to 100°C.

Read-out examples:

30 °C corresponds to a resistance of 3790 to 4270 Ω
80 °C corresponds to a resistance of 600 to 660Ω

If specified value is not obtained:

-- Replace Fuel Temperature Sensor -G81-, refer to item: 8.

-- Erase DTC memory of Engine Control Module (ECM) DIAGNOSTIC MODE 04 - ERASE DTC MEMORY

-- Generate readiness code READINESS CODE .

If specified value is obtained, check Control Module Wires

Control Module Wires, Checking

-- Connect test box (VAG1598/42) to Engine Control Module (ECM) -J623- wiring harness using adapter cable (VAG1598/39-1), connecting test box for wiring test.

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

Fig 3: Identifying 2-Pin Connector & Terminals

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Terminal 1+socket 40

Terminal 2+socket 39

Wire resistance: max. 1.5Ω

-- Also 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 Engine Control Module (ECM) -J623- ENGINE CONTROL MODULES, REPLACING .

Fuel Temperature Sensor 2, Test Sequence

-- Disconnect 2-pin connector from Fuel Temperature Sensor 2 -G248-, refer to item: 11.

-- Measure resistance between terminals on sensor.

See diagram for specified value

Fig 4: Identifying Temperature & Resistance Values Graph

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Range A displays resistance values for the temperature range of 0 to 65°C, range B displays resistance values for the temperature range of 65 to 100°C.

Read-out examples:

30 °C corresponds to a resistance of 3790 to 4270 Ω
80 °C corresponds to a resistance of 600 to 660Ω

If specified value is not obtained:

-- Replace Fuel Temperature Sensor 2 -G248-, refer to item: 11.

-- Erase DTC memory of Engine Control Module (ECM) DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .

-- Generate readiness code READINESS CODE .

If specified value is obtained, check Control Module Wires

Control Module Wires, Checking

-- Connect test box (VAG1598/42) to Engine Control Module 2 -J624- wiring harness using adapter cable (VAG1598/39-1), connecting test box for wiring test.

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

Fig 5: Identifying 2-Pin Connector & Terminals

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Terminal 1+socket 40

Terminal 2+socket 39

Wire resistance: max. 1.5Ω

-- Also 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 Engine Control Module 2 -J624- ENGINE CONTROL MODULES, REPLACING .