Beetle L4-1781cc 1.8L Turbo (APH) (1999)
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Set multimeter for voltage measurement and connect it to terminals 1 + 2 at connector to control module.
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Start engine, and let run at idle.
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Measure voltage supply
Specified value: oscillating between 0.0 and 12.0 V
If there is no voltage:
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Switch ignition off.
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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 4-pin connector for open circuit according to wiring diagram.
Terminal 2+socket 63
Wire resistance: max. 1.5 ohms
If specified value is obtained:
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Check wire connection from terminal 1 to Fuel Pump (FP) Relay -J17-according to wiring diagram.
If no malfunctions are found in wires:
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Replace Engine Control Module (ECM).
With Manufacturer's Scan Tool
Heated Oxygen Sensor (HO2S) -G39-, Checking
NOTE:
Only gold-plated contacts must be used to repair the contacts in the oxygen sensors connectors.
Special tools, test equipment and auxiliary items
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Scan tool VAG 1551 or vehicle system tester VAG 1552 with cable VAG 1551/3B
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Test box VAG 1598/31
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Multimeter (Fluke 83 or equivalent)
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Adapter set VAG 1594
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Wiring diagram
Check conditions