LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Audi >> 2016 >> Q3 Premium Plus >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Generic Scan Tool - Transmission DTC Tables & Diagnostic Procedures >> St Generic Scan Tool >> Diagnosis And Testing >> Diagnostic Procedures >> Accelerator Pedal Module - GX2-, Checking
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Accelerator Pedal Module - GX2-, Checking

General Description 

The Accelerator Pedal Position Sensor -G79- and Accelerator Pedal Position Sensor 2 -G185- are combined in one component and integrated into the Accelerator Pedal Module - GX2-. They are used to detect the position of the accelerator pedal throughout the entire adjustment range. The Engine Control Module - J623- detects the driver's request from these signals and uses them to calculate the injection quantity and EPC Throttle valve operation.

The Accelerator Pedal Module - GX2- contains the following components:

The Accelerator Pedal Module - GX2- components cannot be serviced separately, and they must be serviced as a unit.

Special tools and workshop equipment required 

Test requirements 

Test Procedure 

Step Procedure Result / Action to Take
1
  • PERFORM: Preliminary Check to verify the customers concern. Refer to PRELIMINARY CHECK .
-- Was Complaint verified?
-- YES: -- NO:
  • GATHER more information from customer about the complaint.
  • CONNECT: Scan Tool.
  • IGNITION: ON.
  • CHECK: Throttle valve position closed.
  • SPECIFIED VALUE: 3 - 25%.
  • DEPRESS: Accelerator pedal slowly to WOT while observing the percentage display. The percentage display must increase uniformly.
  • CHECK: Throttle valve position at WOT.
  • SPECIFIED VALUE: 84 - 97%.
  • IGNITION: OFF.
-- Was Value obtained?
-- YES:
  • Condition may be intermittent.
  • PERFORM: Visual Inspection of wiring and component.
  • CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals.
  • REPAIR: Faulty wiring or connector.
  • GO TO: Step 6 Accelerator Pedal Module - GX2-, CHECKING => 6 .
-- NO:
  • DISCONNECT: Accelerator Pedal Module - GX2- harness connector.
  • IGNITION: ON.
  • CHECK: Accelerator Pedal Module - GX2- harness connector terminals 1 to 5 and 2 to 3 for voltage.
  • IGNITION: OFF.
  • SPECIFIED VALUE: About 5.0 V.
-- Were Values obtained?
-- YES: -- NO:
  • REMOVE: Engine Control Module - J623-. Refer to appropriate repair information.
  • CHECK: Accelerator Pedal Module - GX2- harness connector terminal 4 to the Engine Control Module - J623- harness connector T94 / 83 for resistance.
  • CHECK: Accelerator Pedal Module - GX2- harness connector terminal 6 to the Engine Control Module - J623- harness connector T94 / 61 for resistance.
  • SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω).
-- Were Values obtained?
-- YES: -- NO:
  • PERFORM: Visual Inspection of wiring and component.
  • CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals.
  • REPAIR: Faulty wiring or connector.
  • GO TO: Step 6 Accelerator Pedal Module - GX2-, CHECKING => 6 .
  • REMOVE: Engine Control Module - J623-. Refer to appropriate repair information.
  • CHECK: Accelerator Pedal Module - GX2- harness connector terminal 1 to the Engine Control Module - J623- harness connector T94 / 81 for resistance.
  • CHECK: Accelerator Pedal Module - GX2- harness connector terminal 2 to the Engine Control Module - J623- harness connector T94 / 82 for resistance.
  • CHECK: Accelerator Pedal Module - GX2- harness connector terminal 3 to the Engine Control Module - J623- harness connector T94 / 35 for resistance.
  • CHECK: Accelerator Pedal Module - GX2- harness connector terminal 5 to the Engine Control Module - J623- harness connector T94 / 11 for resistance.
  • SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω)
-- Were Values obtained?
-- YES: -- NO:
  • PERFORM: Visual Inspection of wiring and component.
  • CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals.
  • REPAIR: Faulty wiring or connector.
  • GO TO: Step 6 Accelerator Pedal Module - GX2-, CHECKING => 6 .
  • Final Procedure 
  • Perform a road test to verify repair.
-- Does the original DTC return?
-- YES:
  • CHECK: Engine Control Module -J623- harness connector for any damaged, pushed-out pins.
  • REPAIR: As necessary.
  • If all electrical connections are OK:
  • REPLACE: Engine Control Module -J623-. Refer to appropriate repair information.
  • Clear the DTC's. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
  • Repair is complete. Generate Readiness Code. Refer to READINESS CODE .
  • Return vehicle to Customer.
-- NO:
  • Perform the diagnostic procedure for any DTC's.
  • If no DTC's return, the repair is complete.
  • Return vehicle to customer.