LEMON Manuals: Even more car manuals for everyone
Home >> Audi >> 1994 >> 100 CS, 2.8 K >> Repair and Diagnosis (Single Page) >> Steering >> Power Steering >> Steering System - Electronic Power >> Testing >> System Test

System Test

  1. Turn ignition off. Check fuse No. 9 located in fuse block below instrument panel, on driver's side. See Fig 1 . If fuse is okay, go to next step. If fuse is blown, repair short circuit.
    WARNING: ECU is located behind glove box. See AIR BAG RESTRAINT SYSTEM article in the ACCESSORIES/SAFETY EQUIPMENT section before removing glove box.
  2. Disable passenger-side air bag. Remove glove box. Unplug ECU harness connector. Turn ignition on. Using a DVOM, check for battery voltage between ECU harness connector terminals No. 2 and 7. See Fig 2 . If battery voltage exists, go to next step. If battery voltage does not exist, repair open circuit.
    Fig 1: Identifying Fuses
    G94D55064Courtesy of AUDI OF AMERICA, INC.
    Fig 2: Identifying Electronic Power Steering ECU Connector Terminals
    G94E55065Courtesy of AUDI OF AMERICA, INC.
  3. Remove fuse No. 9. Using an ohmmeter, check for continuity between ECU harness connector terminals No. 8 and 11. If continuity does not exist, go to next step. If continuity exists, repair short circuit.
  4. Using a jumper wire, jump across fuse No. 9 connector terminals. Using an ohmmeter, check for continuity between fuse No. 9 connector terminals. If continuity does not exist, disconnect jumper wire and go to next step. If continuity exist, repair open circuit.
  5. Disconnect electrical connector at flow control valve on gear box. Check for continuity between flow control valve connector terminals. If continuity does not exist, go to next step. If continuity exists, repair open or short circuit.
  6. Using a jumper wire, jump across fuse No. 9 connector terminals. Check for continuity between fuse No. 9 connector terminals. If continuity does not exist, disconnect jumper wire and go to next step. If continuity exists, repair open or short circuit.
  7. Check for continuity between flow control valve terminals at gear box. If continuity is 6-12 ohms, go to next step. If continuity is not as specified, replace flow control valve.
  8. Check for continuity between ECU harness connector terminals No. 7 and 8. If continuity does not exist, go to next step. If continuity exists, repair short circuit.
  9. Check for continuity between ECU harness connector terminals No. 7 and 11. If continuity does not exist, go to next step. If continuity exists, repair short circuit.
  10. Check for continuity between ECU harness connector terminals No. 2 and 11. If continuity does not exist, go to next step. If continuity exists, repair short circuit.
  11. Check for continuity between ECU harness connector terminals No. 2 and 8. If continuity does not exist, replace ECU. If continuity exists, repair short circuit.
scientia non olet · About LEMON Manuals