Beetle L4-1.9L DSL Turbo (ALH) (1998)
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To do so, measure resistance anew between test box sockets 3 +25:
Specified value: 115...135 ohms
If resistance value is not in specified range:
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Check CAN-Bus wires.
If no malfunctions are detected in wires:
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Replace Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248-.
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Generate readiness code. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles
and Readiness Codes
Checking CAN-Bus wires
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Remove air filter housing.
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Disengage connector from ABS control module and disconnect.
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Disengage connectors from control module for Diesel-Direct fuel injection system and disconnect the connectors.
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Check CAN data bus wires for short circuit to each other:
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To do so, measure resistance anew between test box sockets 3 + 25 at V.A.G 1598/18 Adapter - 68-pin:
Specified value: Infinite Ohms
If specified value is not obtained (wires have no short circuit to each other):
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Eliminate error in wires according to wiring diagram:
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Erase DTC memory of control module for Diesel-Direct fuel injection system, Diagnostic mode 4: Reset/erase diagnostic data. See: Powertrain
Management/Computers and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/With Generic Scan Tool/Diagnostic
Mode 4: Reset/Erase Diagnostic Data
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Generate readiness code. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles
and Readiness Codes
If specified value is obtained (wires have no short circuit to each other):
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Connect test box to control module wiring harness, connect test box for wiring test. See: Powertrain Management/Computers and Control
Systems/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 CAN-Bus wires between test box sockets for open circuit according to wiring diagram:
Socket 68 (1598/22) and Socket 3 (1598/18)
Socket 75 (1598/22) and Socket 25 (1598/18)
Wire resistance: max. 1.5 ohms
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Also check wires for short circuits to B+ or Ground (GND).
If no malfunctions are detected in wires: