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Home >> Audi >> 2013 >> S8 >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control Systems >> 4.0L - Generic Scan Tool - Engine Code(S): CEUA & CGTA (Transmission DTC Table & Diagnostic Procedures) >> St Generic Scan Tool >> Diagnosis And Testing >> Diagnostic Procedures >> Fuel Tank Leak Detection Control Module -J909- / Fuel Tank Pressure Sensor -G400-, CHECKING >> Test Procedure

Test Procedure

Step Procedure Result / Action to Take
1
  • PERFORM: Preliminary Check to verify the customers concern. Refer to PRELIMINARY CHECK
-- Was concern verified?
-- YES:
  • GO TO: Step 2
-- NO:
  • Gather more Information from customer about the concern
2
  • DISCONNECT: Fuel Tank Lead Detection Control Module -J909- connector
  • IGNITION: ON
  • CHECK: Fuel Tank Lead Detection Control Module -J909- connector terminal 4 to ground.
  • SPECIFIED VALUE: Battery voltage
  • IGNITION: OFF
-- Was Value obtained?
-- YES:
  • GO TO: Step 3
-- NO:
  • CHECK: wiring for open, high resistance, short or connector for damage, corrosion, loose or broken terminals
  • REPAIR: faulty wiring or connector
  • REPLACE: any open Fuses
  • GO TO: Step 5
3
  • DISCONNECT: Fuel Tank Pressure Sensor -G400- connector.
  • CHECK: Fuel Tank Pressure Sensor -G400- component connector terminals 1 to 2 for resistance.
  • SPECIFIED VALUE: 25 Ω (± 15 Ω @ approx. 20°C)
-- Was Value obtained?
-- YES:
  • GO TO: Step 4
-- NO:
  • REPLACE Fuel Tank Pressure Sensor -G400- Refer to appropriate repair information
  • GO TO: Step 5
4
  • CHECK: Fuel Tank Lead Detection Control Module -J909- connector terminal 1 to the Fuel Tank Pressure Sensor -G400- connector terminal 1 for resistance.
  • CHECK: Fuel Tank Lead Detection Control Module -J909- connector terminal 5 to the Fuel Tank Pressure Sensor -G400- connector terminal 3 for resistance.
  • REMOVE: Engine Control Module - J623-. Refer to appropriate repair information.
  • CHECK: Fuel Tank Lead Detection Control Module -J909- connector terminal 2 to the Engine Control Module - J623- connector terminals T91 / 69 for resistance.
  • CHECK: Fuel Tank Lead Detection Control Module -J909- connector terminal 3 to the Engine Control Module - J623- connector terminals T91 / 89 for resistance.
  • SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω)
-- Were Values obtained?
-- YES:
  • REPLACE Fuel Tank Lead Detection Control Module -J909- Refer to appropriate repair information
  • GO TO: Step 5
-- NO:
  • CHECK: wiring for open, high resistance, short or connector for damage, corrosion, loose or broken terminals
  • REPAIR: faulty wiring or connector
  • GO TO: Step 5
5
  • Final Procedure
  • Perform a road test to verify repair.
  • Do any DTC's return:
-- YES:
  • Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
  • Perform the diagnostic procedure for that DTC.
  • FAULT RETURNS: no malfunction are detected in the wiring.
  • REPLACE: Engine Control Module - J623-. Refer to proper repair information for removal and replace procedures.
-- NO:
  • Repair is complete, Generate readiness code. Refer to READINESS CODES .
  • Return vehicle to Customer