Rabbit L5-2.5L (BGP) (2006)
Main Relay (Computer/Fuel System): Testing and Inspection
Motronic Engine Control Module (ECM) Power Supply Relay J271 Checking
Special tools, testers and auxiliary items required
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Multimeter
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wiring diagrams
NOTE: The manufacturers test box Adapter Cable (121-point) VAG 1598/31 is available for purchase or rental. Refer to the Tool catalog .
Test requirements
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The fuse for the engine electronics OK.
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The Ground (GND) connections at the engine and transmission OK.
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The battery voltage at least 12.5 V.
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The generator OK.
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The ignition is switched off.
Test sequence
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Switch the ignition on.
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Using the Multimeter, check the following wiring connections for voltage.
Motronic Engine Control
Measure to
Module (ECM) J623 electrical
connector T121 terminal
or test box socket
1
Battery Positive (B+)
92
Engine Ground (GND)
Specified value: approx. battery voltage.
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Switch the ignition off.
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Using the Multimeter, check the following wiring connections for voltage.
Motronic Engine Control
Measure to
Module (ECM) J623 electrical
connector T121 terminal
or test box socket
3
Engine Ground (GND)
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Switch ignition on.
Specified value: 12.5 battery voltage.
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Switch the ignition off.
If the specified values are not obtained:
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Using the Multimeter, check previously checked wiring connections for continuity.
Specified value: Wire resistance max 1.5 Ohms.
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If necessary, repair the wiring connection.
If no malfunctions are found in the wiring:
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Check the Motronic Engine Control Module (ECM) Power Supply Relay J271.
Final procedures
After the repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. See: Computers and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Diagnostic Mode 03:
Interrogating Fault Memory
2. If necessary, erase the DTC memory. See: Computers and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Diagnostic
Mode 04: Reset/Delete Diagnostic Data
3. If the DTC memory was erased, generate readiness code. See: Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive
Cycles and Readiness Codes
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End of diagnosis.