Beetle L4-1781cc 1.8L Turbo (APH) (1999)
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Connect test box to control module wiring harness, connect test box for wiring test. Engine Control Module (ECM) is not connected. See: Testing
and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/With Generic Scan Tool/Test Box, Connecting For Wiring
Test
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Check wire between test box and 6-pin connector for open circuit according to wiring diagram.
Terminal 4 + socket 5
Wire resistance: max. 1.5 ohms
If no malfunctions are found in wires:
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Replace Engine Control Module (ECM).