Test Procedure

WARNING: This page is about a different car, the 2018 Audi A3 Quattro, 2017 Audi A3 Quattro, 2016 Audi A3 Quattro, 2016 Audi A3, and 2015 Audi A3 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

Step	Procedure	Result / Action to Take
1	PERFORM: Preliminary Check to verify the customers concern. Refer to PRELIMINARY CHECK . -- Was Complaint verified?	-- YES: GO TO: Step 2. -- NO: GATHER more information from customer about the complaint.
2	IGNITION: OFF. DISCONNECT: Motronic Engine Control Module Power Supply Relay -J271- from the Fuse Panel B -SB- in the engine compartment (refer to appropriate wiring diagram). IGNITION: ON. CHECK: Motronic Engine Control Module Power Supply Relay -J271- socket terminals 1/86 and 5/87 to ground for voltage. IGNITION: OFF. SPECIFIED VALUE: Battery Voltage. -- Were Values obtained?	-- YES: GO TO: Step 3. -- 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.
3	REMOVE: Engine Control Module - J623-. Refer to appropriate Service Information. CONNECT: Jumper wire, between the Motronic Engine Control Module Power Supply Relay -J271- socket terminals 5/87 and 3/30. IGNITION: ON. CHECK: Engine Control Module -J623- harness connector T91 / 5 and T91 / 6 to ground for voltage. IGNITION: OFF. SPECIFIED VALUE: Battery Voltage. -- Were Values obtained?	-- YES: GO TO: Step 4. -- NO: GO TO: Step 5.
4	REMOVE: Jumper wire, between the Motronic Engine Control Module Power Supply Relay -J271- socket terminals 5/87 and 3/30. CHECK: Motronic Engine Control Module Power Supply Relay -J271- socket terminal 2/85 to the Engine Control Module -J623- harness connector T91 / 7 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Was Value obtained?	-- YES: REPLACE: Motronic Engine Control Module Power Supply Relay -J271-. Refer to appropriate Service Information. GO TO: Step 6. -- 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.
5	REMOVE: Jumper wire, between the Motronic Engine Control Module Power Supply Relay -J271- socket terminals 5/87 and 3/30. REMOVE: Appropriate Fuse (refer to appropriate wiring diagram for correct fuse). CHECK: Downstream (output) side of Appropriate Fuse to the Engine Control Module -J623- harness connector T91 / 5 and T91 / 6 for resistance (refer to appropriate wiring diagram for correct fuse). SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Were Values obtained?	-- YES: REPLACE: Fuse Panel B -SB- fuse box. Refer to appropriate Service Information. GO TO: Step 6. -- 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.
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 Service 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.