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 SYSTEMSTECHNICAL SERVICE BULLETINSCUSTOMER INTERESTENGINE CONTROLS - INCORRECT FC G68 (SPEED SENSOR) SET
1991 Volkswagen Jetta L4-1984cc 2.0L DOHC
Engine Controls - Incorrect FC G68 (Speed Sensor) Set
1991 Volkswagen Jetta L4-1984cc 2.0L DOHCSECTION Engine Controls - Incorrect FC G68 (Speed Sensor) Set
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Subject: CIS-E Motronic - VAG 1551 Fault Discrepancy
Model(s): Passat, Jetta GLI
Group: D2
Number: D2-90-T01
Date: May 31, 1990
When using the VAG 1551 tester for diagnosing faults in the CIS-E Motronic Engine management System, the following fault may be indicated:
Transmission speed sensor - G68
This fault is in error, it should read:
Speed sensor - G54
The Fault code table on Page D2-30-1 should be revised as follows:
Fault
Code VAG 1551 Display Possible Cause of Fault Repair
1111 Control unit defective Defective components in Replace (J204)
control unit (J 204)
1231 Speed Sensor (G54) (G54) defective Check (G54),
Section D2-50 Test step 5
No signal Open circuit Check wiring
Subject: CIS-E Motronic - VAG 1551 Fault Discrepancy
Model(s): Passat, Jetta GLI
Group: D2
Number: D2-90-T01
Date: May 31, 1990
When using the VAG 1551 tester for diagnosing faults in the CIS-E Motronic Engine management System, the following fault may be indicated:
Transmission speed sensor - G68
This fault is in error, it should read:
Speed sensor - G54
The Fault code table on Page D2-30-1 should be revised as follows:
Fault
Code VAG 1551 Display Possible Cause of Fault Repair
1111 Control unit defective Defective components in Replace (J204)
control unit (J 204)
1231 Speed Sensor (G54) (G54) defective Check (G54),
Section D2-50 Test step 5
No signal Open circuit Check wiring
RENDER: 1.0x
NO RELATED
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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.