Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSVOLKSWAGEN1999CABRIO (1V7) L4-2.0L (ABA)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESGENERIC SCAN TOOLDIAGNOSTIC MODE 3: CHECK DTC MEMORY
1999 Volkswagen Cabrio (1V7) L4-2.0L (ABA)
Diagnostic Mode 3: Check DTC Memory
1999 Volkswagen Cabrio (1V7) L4-2.0L (ABA)SECTION Diagnostic Mode 3: Check DTC Memory
Diagnostic mode 3: Check DTC Memory
Function
This diagnostic mode indicates all stored DTCs of components and systems which are emission relevant.
Malfunction Indicator Lamp (MIL) in instrument cluster lights up for a DTC entry.
SAE Diagnostic Trouble Codes (DTCs)
The DTC always consists of a 5-digit alpha-numeric value with the following meaning:
Procedure
- Connect diagnostic tester.
- Start engine and let run at idle.
Note: Only if engine does not start:
- Operate starter for approx. 6 seconds.
- Do not switch ignition off afterward.
- Under address word 33, select "Diagnostic mode 3: Check DTC memory."
The number of stored malfunctions or "0 malfunctions detected" is displayed.
- End diagnosis and switch ignition off.
- Repair stored malfunctions according to DTC test procedure:
Note: "Emission"-relevant malfunctions are additionally indicated in the instrument cluster via the exhaust Malfunction Indicator Lamp (MIL).
- In Diagnostic mode 2, it can be determined at which operating condition a malfunction was detected and stored by the Engine Control Module (ECM) or by the Transmission Control Module (ECM).
- Erase DTC memory after repairing malfunction.
Display example:
P0444 Evaporative Emission (EVAP) Canister Purge Regulator ValveCircuit Open
Explanation:
P0444 = SAE diagnostic trouble code (malfunction identification number).
Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- = malfunctioning wiring path or malfunctioning component.
Open circuit = Malfunction type as text
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.