Fuel Gauge, Checking (Adaptation)
Fuel Gauge, Checking (Adaptation)
If the fuel gauge displays the contents of the fuel tank as being too high or too low, the fuel gauge needle position can be corrected (adapted).
- Perform Output Diagnostic Test Mode (DTM) for instrument cluster. Output Diagnostic Test Mode (DTM) (Function 03)
- Check function of fuel gauge sender if Output Diagnostic Test Mode (DTM) does not indicate a malfunction.
- Check resistance value of fuel gauge sender in measuring value block. Adaptation (Function 10)
If measuring value block does not indicate a short circuit or open circuit in the wiring or the fuel gauge sender, continue checks:
Special tools, testers, measuring units and auxiliary items required
- Fuel extraction unit VAG 1433 A (or local equivalent)
- Switch off ignition.
- Drain fuel tank completely (VAG 1433 A), then fill with 7 liters (1.84 gal) of fuel (ensure ignition is OFF).
NOTE: Wait a minimum of 1 minute before proceeding with adaptation in order to ensure a stable fuel level for adaptation purposes.
WARNING:
- Fire hazard. DO NOT smoke or work near heaters or have anything in the area that can ignite fuel.
- Always drain fuel from fuel tank using an approved fuel cart.
- Wear fuel-resistant gloves whenever working with open parts of the fuel system.
- Connect VAG 1551 Scan Tool (ST), select 1 "Rapid Data Transfer", switch on ignition, input address word 17 "Instrument cluster".
Indicated on display:
Rapid data transfer Q
17 instrument cluster
- Press -Q- button to confirm input.
Indicated on display (example only):
1C0920901C A4-COMBI INSTR.VDO V04 ->
Coding 00000 WSC 00000
- Press -Q- button to confirm input.
Indicated on display:
IMMO-IDENT No.: VWZ7Z0V0066808 ->
- Press -Q- button to confirm input.
Indicated on display (select function):
Rapid data transfer HELP
Select function XX
- Press buttons -1- and -0- to select function 10 "Adaptation".
Indicated on display:
Rapid data transfer Q
10 - Adaptation
- Press -Q- button to confirm input.
Indicated on display:
Adaptation
Enter channel number XX
- Press buttons -3- and -0- to select channel 30.
Indicated on display:
Adaptation Q
Enter channel number 30
- Press -Q- button to confirm input.
Indicated on display:
Channel 30 Adaptation 128 ->
< - 1 3- >
- Use button 1 to decrease adaptation value down to 120
- Use button 3 to increase value up to 136, e.g. 130.
- Indicated on display:
Adaptation is correct when the fuel gauge needle is positioned on the middle of the three red graduations (reserve) as illustrated.
When needle position is OK:
- Press -Q- button to confirm input.
- Indicated on display (example only):
- Press -Q- button to confirm input.
- Indicated on display:
- Press -> button to complete adaptation sequence.
Indicated on display:
Rapid data transfer HELP
Enter address word XX
NOTE: If fuel gauge cannot be adapted correctly, replace fuel gauge sender.
- Press buttons -0- and -6- to select function 06 "End output".
Indicated on display:
Rapid data transfer Q
06 End output
- Press -Q- button to confirm input.
Indicated on display:
Rapid data transfer HELP
Enter address word XX
The tester is now in basic function again.