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 MANUALSVOLKSWAGEN1991JETTA L4-1984CC 2.0L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTRANSMISSION CONTROL SYSTEMSRELAYS AND MODULES - TRANSMISSION AND DRIVETRAINRELAYS AND MODULES - A/TCONTROL MODULETECHNICAL SERVICE BULLETINS
1991 Volkswagen Jetta L4-1984cc 2.0L DOHC
Control Module: Technical Service Bulletins
1991 Volkswagen Jetta L4-1984cc 2.0L DOHCSECTION Technical Service Bulletins
- Recalls
- Recall - Revised Vehicle System Work Procedures
- General Information
- Precondition and Tools Required
- Work Procedure
- A. Secure Venturi
- B. Checking For Proper Connector Terminals
- C. Replace Vacuum Hoses
- D. Check Engine Manifold Vacuum
- E. Check EGR Valve Function
- F. Check EGR Vacuum Amplifier
- G. Check/Replace Engine Control Module
- H. Check/Replace Engine Control Module
- I. Check/Replace Transmission Control Module (Tcm)
- J. Check Basic Engine Adjustment
- K. Adjust CO Fuel Trim (FT) As Follows
- L. Secure Injector Fuel Lines
- M. Trim A/C Line Foam Tube (GLI and GTI Only)
- N. Replace Shift Lever Handle
- O. Road Test Procedure
- Recall - Revised Vehicle System Work Procedures
- Customer Interest
- All Technical Service Bulletins
- CIS E Motronic ECU - Update
- Recall - Revised Vehicle System Work Procedures
- General Information
- Precondition and Tools Required
- Work Procedure
- A. Secure Venturi
- B. Checking For Proper Connector Terminals
- C. Replace Vacuum Hoses
- D. Check Engine Manifold Vacuum
- E. Check EGR Valve Function
- F. Check EGR Vacuum Amplifier
- G. Check/Replace Engine Control Module
- H. Check/Replace Engine Control Module
- I. Check/Replace Transmission Control Module (Tcm)
- J. Check Basic Engine Adjustment
- K. Adjust CO Fuel Trim (FT) As Follows
- L. Secure Injector Fuel Lines
- M. Trim A/C Line Foam Tube (GLI and GTI Only)
- N. Replace Shift Lever Handle
- O. Road Test Procedure
- OBD - Basic Setting After Disconnecting Battery
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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.