Trip Computer: Testing and Inspection
Consumption Signal, Checking
Special tools and equipment
- VAG1526 multimeter
- VAG1598 test box with VAG1598/25 adapter
- VAG1594 connector test kit
- Test box for the individual Engine Control Module (ECM)
- Set display indicator of board computer to current consumption (1/100 km),
- Start engine and perform a road test.
- Observe consumption display in instrument cluster.
What appears in the consumption display?
1. constant 0.0 L/100 km
Possible short circuit to battery Ground (GND) in the signal wire.
- Switch ignition off.
- Connect corresponding test box to the Engine Control Module (ECM).
- Remove instrument cluster and disconnect blue 32-pin connector from instrument cluster.
- Connect VAG1598 tester with VAG1598/25 adapter to the blue 32-pin connector.
- Connect (+) adapter lead to VAG1598/25 test box socket 25 using VAG1526 multimeter
- Connect (-) adapter lead to the corresponding test box of Engine Control Module (ECM) and the corresponding consumption signal socket of the Engine Control Module (ECM).
- Perform a resistance check.
Specification: Display < 2 Ohms
- Connect (+) adapter lead to to the corresponding test box of the Engine Control Module (ECM) using VAG1526 multimeter
- Connect (-) adapter lead to battery Ground (GND).
- Perform a resistance check.
Specification: Display > 9 M Ohms
- If the specified values are reached, the wire connection is OK.
2. constant 51 L/100 km
- Switch ignition off.
- Connect test box to Engine Control Module (ECM).
- Remove instrument cluster and disconnect blue 32-pin connector from instrument cluster.
- Connect VAG1598 tester with VAG1598/25 adapter to the blue 32-pin connector.
- Connect (+) adapter lead to VAG1598/25 test box socket 25 using VAG1526 multimeter.
- Connect (-) adapter lead to the corresponding test box of Engine Control Module (ECM) and the corresponding consumption signal socket of the Engine Control Module (ECM).
- Perform a resistance check.
Specification: Display < 2 Ohms
- Connect (+) adapter lead to to the corresponding test box of the Engine Control Module (ECM) using VAG1526 multimeter
- Connect (-) adapter lead to battery Ground (GND).
- Perform a resistance check.
Specification: Display > 9 M Ohms
If the specified values are reached, the wire connection is OK.
3. The consumption display has no logical or fluctuating consumption value.
- Perform adaptation of consumption display.