Vehicles with engine code ALH

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2006 Volkswagen Golf, 2005 Volkswagen Jetta, 2005 Volkswagen Golf, 2004 Volkswagen Jetta, and 2004 Volkswagen Golf. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Fuel Injection Pump

Courtesy of VOLKSWAGEN UNITED STATES, INC.

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

Fig 2: 10-Pin Connector & Terminals

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Measure resistance of sensor at connector terminals 4 + 7.

Fig 3: Resistance Values Graph

Courtesy of VOLKSWAGEN UNITED STATES, INC.

See diagram for specified value

Range A displays resistance values for the temperature range of 0 to 50 ° C, range B displays resistance values for the temperature range of 50 to 100 ° C.

Read-out examples:

30 ° C corresponds to a resistance of 1500 to 2000 Ω
80 ° C corresponds to a resistance of 275 to 375 Ω

If specified value is not obtained:

Replace injection pump. Refer to item 3 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:

Check wires to control module according to wiring diagram. Refer to Fuel Temperature Sensor, checking .