Beetle L4-1.9L DSL Turbo (ALH) (1998)
Malfunction Indicator Lamp: Testing and Inspection
Malfunction Indicator Lamp, significance
Functional check
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Switch ON ignition
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MIL lamp must light up until engine starts.
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The Glow plug indicator light can also light up during the pre-glow period if the engine is cold.
If MIL lamp does not light-up with ignition switched ON:
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Check MIL lamp wiring / MIL lamp bulb using wiring diagram.
If OK:
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Check instrument cluster / ECM and replace.
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Erase DTC memory.
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Set Readiness code.
If the MIL lamp lights-up with ignition switched on, continue check as follows:
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Start engine and let idle
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MIL lamp must switch OFF after a few seconds.
If MIL lamp does not switch OFF:
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Check DTC memory. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic
Trouble Codes/Reading Diagnostic Trouble Codes If no malfunction stored:
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Check MIL lamp using wiring diagram.
If OK:
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Check instrument cluster / ECM and replace.
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Erase DTC memory.
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Set Readiness code.