Fuel gauge -G1-, checking: Checking

If the fuel gauge in the instrument cluster shows an incorrect reading, first check whether the signal is received by the instrument cluster.

Connect VAG1551/VAG1552 Scan Tool (ST) and press buttons -1- and -7- to insert "Instrument Cluster" address word 17 (with ignition switched on). See INSTRUMENT CLUSTER .

Indicated on display

Fig 1: VAG1551 Or VAG1552 Scan Tool (ST) Display - Fuel Gauge Checking (1 Of 8) (Up To M.Y. 1999)

Press -Q- button to confirm input.

Indicated on display (after approximately 5 seconds)

Fig 2: VAG1551 Or VAG1552 Scan Tool (ST) Display - Fuel Gauge Checking (2 Of 8) (Up To M.Y. 1999)

Press => button.

Indicated on display

Fig 3: VAG1551 Or VAG1552 Scan Tool (ST) Display - Fuel Gauge Checking (3 Of 8) (Up To M.Y. 1999)

Press buttons -0- and -8- to select "Read Measuring Value Block" function 08, and press -Q- button to confirm input.

Indicated on display

Fig 4: VAG1551 Or VAG1552 Scan Tool (ST) Display - Fuel Gauge Checking (4 Of 8) (Up To M.Y. 1999)

Indicated on display

Fig 5: VAG1551 Or VAG1552 Scan Tool (ST) Display - Fuel Gauge Checking (5 Of 8) (Up To M.Y. 1999)

Press buttons -0-, -0- and -2- to input display group number 002, and press -Q- button to confirm input.

Indicated on display (1-4 = display fields)

Fig 6: VAG1551 Or VAG1552 Scan Tool (ST) Display - Fuel Gauge Checking (6 Of 8) (Up To M.Y. 1999)

If the correct fuel level is displayed in field 2 on the scan tool, but not by the fuel gauge in the instrument cluster, the instrument cluster is faulty and must be replaced. Removing instrument cluster. See INSTRUMENT CLUSTER, REMOVING AND INSTALLING .

If the correct fuel level is not displayed in field 2 of the scan tool:

Check signal to multi-pin connector at instrument cluster. See INSTRUMENT CLUSTER BULB AND MULTI-PIN CONNECTOR LOCATIONS .
Press => button.

Indicated on display

Fig 7: VAG1551 Or VAG1552 Scan Tool (ST) Display - Fuel Gauge Checking (7 Of 8) (Up To M.Y. 1999)

Press buttons -0- and -6- to select "End Output" function 06.

Indicated on display

Fig 8: VAG1551 Or VAG1552 Scan Tool (ST) Display - Fuel Gauge Checking (8 Of 8) (Up To M.Y. 1999)

Press -Q- button to confirm input.

Connect VAG1598/25 test box to blue 32-pin connector.
Using multimeter US1119 (Fluke 83 or equivalent), measure resistance between terminals 5, (fuel gauge sender) and 7, (signal Ground).

Specifications:

Fuel tank full: approx. 270 ohm
Fuel tank half full: approx. 170 ohm
Fuel tank on reserve: approx. 96 ohm

If specifications are not obtained:

Check wiring per wiring diagram.
If wiring is faulty, repair wiring.

If wiring is OK:

Remove sender from tank.
Test sender.

If specifications are still not obtained:

Replace sender.