TT Quattro Roadster L4-1.8L Turbo (AMU) (2002)
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Connect multimeter to terminal 2 and terminal 3 of connector for voltage measurement.
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Operate starter briefly.
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Specification: approx. battery voltage
NOTE: Ground (GND) from the ECM is present at terminal 3 of connector.
If specified value is not obtained:
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Check wire connections.
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Connect multimeter to terminal 3 and terminal 4 of connector for voltage measurement.
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Switch ignition on.
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Specification: about 5 V
If specified value is not obtained:
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Check wire connections.
Check wire connections for Mass Air Flow (MAF) sensor
NOTE: Signal wire is also checked during wire test.
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Connect VAG1598/31 test box at wiring harness to ECM, do not connect ECM. See: Computers and Control Systems/Testing and Inspection/Scan
Tool Testing and Procedures/Scan Tool Testing/Scan Tool Connecting and Initial Checks/Wiring and Component Testing Using VAG1598/31
Test Box