Jetta GLS L4-1.8L Turbo (AWD) (2001)
Malfunction Indicator Lamp: Description and Operation
Malfunction Indicator Lamp, Significance
The Malfunction Indicator Lamp (MIL) lights up when malfunctions are recognized by the Engine Control Module (ECM).
Installation position of exhaust MIL
NOTES:
The Malfunction Indicator Lamp (MIL) can blink or be lit continuously. DTC memory should be checked in both cases. Refer to "On Board Diagnostic".
See: Powertrain Management/Computers and Control Systems/Testing and Inspection
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Blinking: There is a malfunction that damages the catalytic converter in this driving condition. In this case, vehicle must only be driven at reduced
power!
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Steady light: There is a malfunction that causes increased emissions. Check DTC memory for Motronic ECM or automatic transmission.
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DTC memory must still be checked if there are drive ability problems or the customer has made a complaint but the MIL is not lit, because
malfunctions can be stored without causing the MIL to light immediately.
Function test:
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Switch on ignition:
exhaust MIL must light.
If exhaust MIL does not light when ignition is switched on:
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Check instrument cluster and Malfunction Indicator Lamp (MIL).
If exhaust MIL does not light when ignition is switched on, continue test as follows:
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Start engine and let run at idle:
Exhaust MIL must go out after a few seconds.
If exhaust MIL does not go out:
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Check DTC memory, repair any malfunctions and then erase DTC memory See Erasing and checking DTC memory. Refer to "On Board
Diagnostic". See: Powertrain Management/Computers and Control Systems/Testing and Inspection
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Read readiness code. Refer to "On Board Diagnostic". See: Powertrain Management/Computers and Control Systems/Testing and Inspection
If DTC memory was erased or the Engine Control Module (ECM) was disconnected from the continuous B+ supply, the readiness code must be
re-generated. Refer to "On Board Diagnostic". See: Powertrain Management/Computers and Control Systems/Testing and Inspection