Jetta L4-1.8L Turbo (AWP) (2004)
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The respective fuses of Malfunction Indicator Lamp (MIL) -K83-must be OK.
Test sequence
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Switch on ignition: exhaust MIL must light up.
If exhaust MIL does not light up when ignition is switched on:
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Switch ignition off.
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Check wire from ECM to exhaust MIL as follows:
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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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Bridge sockets 2 + 47 of test box with the respective adapter cables.
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Switch on ignition: exhaust MIL must light up.
If Malfunction Indicator Lamp (MIL) does not light up:
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Switch ignition off.
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Remove instrument cluster.
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Check wire connection from Engine Control Module (ECM) to Malfunction Indicator Lamp (MIL) -K83- according to wiring diagram.
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Erase DTC memory of Engine Control Module (ECM), 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 no malfunctions are detected in wire from Engine Control Module (ECM) to Malfunction Indicator Lamp (MIL):
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Replace Motronic Engine Control Module (ECM) -J220-.
If exhaust MIL lights up when ignition is switched on:
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Start engine and let run at idle: Exhaust MIL must go out after a few seconds.
If Malfunction Indicator Lamp (MIL) does not go out:
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Switch ignition off.
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Remove instrument cluster.
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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 wire connection between test box socket 47 and instrument cluster for short circuit to Ground (GND) according to wiring diagram.
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Erase DTC memory of Engine Control Module (ECM), 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 no malfunctions are detected in wire from Engine Control Module (ECM) to Malfunction Indicator Lamp (MIL):
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Replace Motronic Engine Control Module (ECM) -J220-.