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.
1988 Audi 5000 CS, AutomaticFACTORY OEM SERVICE PROCEDURE
Cold Start Valve
- Turn ignition off. Insert fuse into fuel pump relay. Turn ignition on. Remove fuse for 4 seconds. Reinstall fuse for 4 seconds, then remove fuse. Indicator light should display Code 4443.
- Close full throttle switch. Cold start valve should click on and off for 10 seconds maximum. If no click sound is heard, disconnect cold start valve connector.
- Connect LED Tester (US 1115 ) between terminals No. 1 and No. 2 using jumper wire. LED tester should light up. If tester does light up, replace cold start valve. If tester does not light up, connect multimeter between connector terminal No. 1 and ground.
- Multimeter should read 12 volts. If 12 volts are not present, repair break in wiring. If 12 volts are present, remove FICU access cover and disconnect connector.
- Connect multimeter between terminal No. 2 of cold start valve and terminal No. 16 of FICU connector. Multimeter should read .2 ohm. If reading is not to specification, repair break in wiring. If reading is to specification, replace FICU.
Factory Service Tools
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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.