Page 19 of 59
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Checking voltage supply
If specified value is not obtained:
Electrical Wiring Diagrams, Troubleshooting & Component Locations
If no malfunctions are found in wires: - Connect multimeter for voltage measurement as follows.3-socket relay carrier in E-box, plenum
chamber, position 2
Terminal
Measure to
2 Engine Ground
(GND)
9 Engine Ground
(GND)
Specification: approx. battery voltage
- Check wire connection between central electronics and voltage supply
relay for open circuit.
- Replace central electrics.
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Page 38 of 59
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Test requirements:
Fuses for engine electronics OK
Electrical Wiring Diagrams, Troubleshooting &
Component Locations
Battery voltage at least 12.7 V
Generator OK
Test sequence
- Connect VAG1598/31 test box at wiring harness
to Engine Control Module (ECM), do not connect
ECM Page 24
-19
.
- Switch ignition on.
Note:
The plus voltage supply for the Engine Control
Module (ECM) travels via terminal 3 and 121
(terminal 15) as well as terminal 62 (terminal
30).
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Page 42 of 59
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- Connect multimeter for voltage measurement as
follows:
VAG1598/31 test box
Socket
Measure to
121
1)
Engine Ground (GND)
1) The motronic Engine Control Module (ECM)
power supply relay -J271- continues to direct
current to terminal 121 of the Engine Control
Module (ECM) for up to 15 minutes after ignition
is switched off.
- Switch ignition on.
Specification: approx. battery voltage
If specified value is not obtained:
- Check wire connections.
Electrical Wiring Diagrams, Troubleshooting &
Component Locations
-
Check motronic Engine Control Module (ECM)
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