Malfunction Criteria and Threshold Value Adaptive value. Secondary Parameters with Enable Conditions. >50.8 S Engine load 9-45% Delta fuel adaptation

Transcription

1 DTC Error Message P0171 System Too Lean (Bank 1) Diagnostic Procedure Check fuel pump delivery and quantity. Refer to page 126. Check Fuel pressure regulator and residual pressure. Refer to Fuel Injection and Ignition Repair Manual. Check Fuel Pressure Sensor - G247-. Refer to page 179. Check the fuel injectors. Refer to page 187. Check Heated Oxygen Sensor (HO2S) - G39-. Refer to page 191. Check Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) - G130-. Refer to page 193. Check Evaporative Emission (EVAP) Canister Purge Regulator Valve - N80-. Refer to page 130. Malfunction Criteria and Threshold Value Adaptive value >5% Secondary Parameters with Enable Conditions Lambda control, closed loop evap purge valve, closed ECT, > 60 C Substitute ECT, 80 C Engine speed < 1200 RPM Mass air flow < 26 kg/h Duration of multiplicative check >50.8 S Engine load 9-45% Delta fuel adaptation <0.234 Monitoring Time Length 150 Seconds Frequency of checks, MIL Illumination Continuous 2 DCY Check intake system for permitted unless authorised by AUDI AG. leaks AUDI AG (false does not guarantee or accept any liability air). Check exhaust system 5. Engine DTC Table 29

2 DTC Error Message Diagnostic Procedure for proper seal. Malfunction Criteria and Threshold Value Secondary Parameters with Enable Conditions Monitoring Time Length Frequency of checks, MIL Illumination P0172 System Too Rich (Bank 1) Check vacuum lines for leaks Check Fuel pressure regulator and residual pressure Refer to Fuel Injection and Ignition Repair Manual. Adaptive value < -6% Lambda control, closed loop evap purge valve, closed ECT, > 60 C Substitute ECT, 80 C 150 Seconds Continuous 2 DCY Check the fuel injectors. Refer to page 187. Check Evaporative Emission (EVAP) Canister Purge Regulator Valve - N80-. Refer to page 130. Engine speed < 1200 RPM Mass air flow < 26 kg/h Duration of multiplicative check >50.8 S Engine load 9-45% Delta fuel adaptation <0.234 Check Heated Oxygen Sensor (HO2S) - G39-. Refer to page 191. P0190 Fuel Rail Pressure Sensor A Circuit P0192 Fuel Rail Pressure Sensor A Circuit Low Input Check Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) - G130-. Refer to page 193. Check Fuel Pressure Sensor - G247-. Refer to page 179. Check Fuel Pressure Sensor - G247-. Refer to page 179. Signal voltage > 4.8 V Signal voltage < 2.0 V permitted unless authorised by AUDI --- AG. AUDI AG does 0.5 not Sec guarantee or accept any liability onds Seconds Continuous 2 DCY Continuous 2 DCY 30 Rep. Gr.ST - Generic Scan Tool

3 Assembly is performed in the reverse of the removal. Final procedures After the repair work, the following work steps must be performed in the following sequence: 1 - Check the DTC memory. page If necessary, erase the DTC memory. page If the DTC memory was erased, generate readiness code. page 21. End of diagnosis 1.4 Fuel Pump Delivery Quantity, Checking Special tools and workshop equipment required Hand held remote control (jumper). Multimeter. Electrical connector test lead set. Test conditions Battery voltage 12.5 V. Fuse - SD12- OK. Fuse - SF6- OK. Fuse - SC1- OK. Fuel Pump (FP) Control Module - J538- OK. Fuel filter OK. Ignition switched off. Test sequence Remove the rear seat bench. Refer to Body Interior Repair Manual. Remove the left locking flange cover-arrows Rep. Gr.20 - Fuel Supply

4 Disconnect the Transfer Fuel Pump (FP) - G6- electrical harness connector -arrow-. Connect a Hand held remote control (jumper) to terminal -1- of the Transfer Fuel Pump (FP) - G6- and to vehicle battery (+). Connect a jumper cable from a Electrical connector test lead set to terminal -4- of the Transfer Fuel Pump (FP) - G6- and to vehicle Ground (GND). Remove fuel filler cap from fuel filler tube. Remove the engine cover -arrows-. with respect to the correctness WARNING of information in this document. Copyright by AUDI AG. The fuel system is under pressure! Before opening system, place rags around the connection area. Then release pressure by carefully loosening the connection. Disconnect the fuel return line -arrow-. 1. Fuel Supply System, Servicing 127

5 Connect a Fuel pressure test set (high pressure) to the disconnected fuel return line and hold it in the measuring container -arrow-. Press the switch on the Hand held remote control (jumper) and slowly close the shut-off valve of the fuel pressure gauge. Specified value: 4 Bar positive pressure. With the shut-off valve of the fuel pressure gauge in the same position. Empty measuring container. Press the switch on the Hand held remote control (jumper) and operate the fuel pump for 15 seconds. Compare quantity of fuel delivered with minimum delivery rate in the diagram (cm 3 /15s). Note Voltage at the fuel pump with engine stopped and fuel pump running is approx. 2 volts less than battery voltage. If minimum delivery quantity is not obtained, the following malfunctions may be present: Fuel lines pinched. Fuel filter plugged. Fuel pump faulty. If necessary, repair any pinched or plugged lines. Replace the fuel filter. Refer to Fuel Supply System Repair Manual. Replace the fuel pump. Refer to Fuel Supply System Repair Manual. Assembly is performed in reverse order of removal. Final procedures After repair work, the following work steps must be performed in the mentioned sequence: 1 - Check the DTC memory. page If necessary, erase the DTC memory. page If the DTC memory was erased, generate readiness code. page 21. End of diagnosis 128 Rep. Gr.20 - Fuel Supply

6 Assembly is performed in the reverse of the removal. Final procedures After repair work, the following work steps must be performed in the mentioned sequence: 1 - Check the DTC memory. page If necessary, erase the DTC memory. page If the DTC memory was erased, generate readiness code. page 21. End of diagnosis 2.9 Fuel Pressure Sensor, Checking Special tools and workshop equipment required Multimeter. Wiring diagram. Test requirements The Engine Control Module (ECM) - J623- fuses OK. The fuel filter OK. The battery voltage at least 12.5 V. All electrical consumers switched off (radiator fan must NOT run during test). A/C switched off. The fuel tank at least 1 /4 filled. The ignition switched off. Test procedure Perform a preliminary check to verify the customers complaint. Refer to page 20. Start diagnosis Remove engine cover -arrows-. Checking voltage 2. Components, Checking 179

7 Disconnect the Fuel Pressure Sensor - G247- electrical harness connector -1-. Switch the ignition on. Using a Multimeter, check the Fuel Pressure Sensor - G247- electrical harness connector terminals for voltage. Fuel Pressure Sensor - G247- electrical Specified value harness connector terminals 1 to Battery positive (+) Battery positive (+) 2 to Ground (GND) Battery positive (+) 3 to Ground (GND) about 5 V Switch the ignition off. If the specified value was obtained: Replace the Fuel Pressure Sensor - G247-. Refer to Fuel Injection and Ignition Repair Manual If the specified value was not obtained: Checking wiring connections If the manufacturers test box is being used. Perform the following step. Install the test box. Refer to Fuel Injection and Ignition Repair Manual If the manufacturers test box is not being used. Perform the following step. Remove the Engine Control Module (ECM) - J623-. Refer to 180 Rep. Gr.24 - Multiport Fuel Injection

8 Using a Multimeter, check the Fuel Pressure Sensor - G247- electrical harness connector terminals to the Engine Control Module (ECM) - J623- electrical harness connector T60 terminals for resistance. Fuel Pressure Sensor - G247- electrical harness connector terminals Engine Control Module (ECM) - J623- electrical harness connector T60 terminals or test box socket Specified value: 1.5 Ω Max. If the specification is not obtained: Check the wiring for an open circuit, a short circuit to each other, Battery (+), and Ground (GND). Check the electrical harness connector for damage, corrosion, loose or broken terminals. If necessary, repair the faulty wiring connection. If no malfunction is detected in the wiring: Erase the DTC memory. Refer to page 8. Perform a road test to verify repair. If the DTC does not return: Repair complete, Generate readiness code. Refer to page 21. End diagnosis. If the DTC does return and no malfunction is detected in the wiring and the voltage supply was not OK: Replace the Engine Control Module (ECM) - J623-. Refer to Assembly is performed in the reverse of the removal. Final procedures After repair work, the following work steps must be performed in the mentioned sequence: 1 - Check the DTC memory. page If necessary, erase the DTC memory. page If the DTC memory was erased, generate readiness code. page 21. End of diagnosis 2.10 Low Fuel Pressure Sensor, Checking Special tools and workshop equipment required Multimeter. Wiring diagram. Test requirements The Fuel Pump (FP) Control Module - J538- OK. The Engine Control Module (ECM) - J623- fuses OK. The fuel filter OK. 2. Components, Checking 181

9 Using a multimeter, check the Fuel Metering Valve - N290- electrical harness connector terminals to the Engine Control Module (ECM) - J623- electrical harness connector T60 terminals for resistance. Fuel Metering Valve - N290- electrical harness connector terminal 2 19 Engine Control Module (ECM) - J623- electrical harness connector T60 terminal or test box socket Specified value: 1.5 Ω Max. If the specification was not obtained: Check the wiring for an open circuit, a short circuit to each other, Battery (+), and Ground (GND). Check the electrical harness connector for damage, corrosion, loose or broken terminals. If necessary, repair the faulty wiring connection. If no malfunction is detected in the wiring: Erase the DTC memory. Refer to page 8. Perform a road test to verify repair. If the DTC does not return: Repair complete, Generate readiness code. Refer to page 21. End diagnosis. If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK: Replace the Engine Control Module (ECM) - J623-. Refer to Assembly is performed in the reverse of the removal. Final procedures After repair work, the following work steps must be performed in the mentioned sequence: 1 - Check the DTC memory. page If necessary, erase the DTC memory. page If the DTC memory was erased, generate readiness code. page 21. End of diagnosis 2.12 Fuel Injectors, Checking The following test procedure is used to diagnose Fuel Injectors - N30, N31, N32, N33-. Special tools and workshop equipment required Multimeter. Diode test lamp (12V). Wiring diagram. Test requirements The Engine Control Module (ECM) - J623- fuses OK. The Engine Speed (RPM) Sensor - G28- OK. Battery voltage at least 12.5 volts. 2. Components, Checking 187

10 All electrical consumers such as, lights and rear window defroster, switched off. Vehicles with automatic transmission, shift selector lever into position P or N. A/C switched off. Ground (GND) connections between engine/transmission/ chassis OK. Ignition switched off. Observe safety precautions. Observe rules for cleanliness. Test procedure Perform a preliminary check to verify the customers complaint. Refer to page 20. Start diagnosis Remove engine cover -arrows-. Disconnect the Fuel Injector electrical harness connectors. Checking internal resistance Using a multimeter, check the Fuel Injector electrical terminals 1 to 2 for resistance. Specified value: 12.0 to 20.0 Ω (at approx. 20 C) If the specified value was not obtained: Replace the faulty Fuel Injector. Refer to Fuel Injection and Ignition Repair Manual. If the specified value was obtained: Checking activation 188 Rep. Gr.24 - Multiport Fuel Injection

11 Connect a diode test lamp (12V) to the electrical harness connector terminals 1 and 2 of the Fuel Injector to be tested. Operate the starter and test the activation of the Fuel Injector. LED should flicker. Switch the ignition off. If LED does not flicker: Checking wiring If the manufacturers test box is being used. Perform the following step. Install the test box. Refer to Fuel Injection and Ignition Repair Manual If the manufacturers test box is not being used. Perform the following step. Remove the Engine Control Module (ECM) - J623-. Refer to 2. Components, Checking 189

12 Using a Multimeter, check the Fuel Injector electrical harness connector terminals to the Engine Control Module (ECM) - J623- electrical harness connector T60 terminals for resistance. Component Fuel Injector electrical harness connector terminals Engine Control Module (ECM) - J623- electrical harness connector T60 terminals or test box sockets Cylinder 1 Fuel Injector - N Cylinder 2 Fuel Injector - N Cylinder 3 Fuel Injector - N Cylinder 4 Fuel Injector - N Specified value: 1.5 Ω Max. If the specification is not obtained: Check the wiring for an open circuit, a short circuit to each other, Battery (+), and Ground (GND). Check the electrical harness connector for damage, corrosion, loose or broken terminals. If necessary, repair the faulty wiring connection. If no malfunction is detected in the wiring: Erase the DTC memory. Refer to page 8. Perform a road test to verify repair. If the DTC does not return: Repair complete, Generate readiness code. Refer to page 21. End diagnosis. If the DTC does return and no malfunction is detected in the wiring and the voltage supply was not OK: Replace the Engine Control Module (ECM) - J623-. Refer to Assembly is performed in the reverse of the removal. Final procedures After repair work, the following work steps must be performed in the mentioned sequence: 1 - Check the DTC memory. page If necessary, erase the DTC memory. page If the DTC memory was erased, generate readiness code. page 21. End of diagnosis 190 Rep. Gr.24 - Multiport Fuel Injection

13 3 Functions, Checking 3.1 Heated Oxygen Sensor, Checking, page Oxygen Sensor after Catalytic Converter, Checking, page Heated Oxygen Sensor, Checking Note Use only gold-plated terminals when servicing terminals in the electrical harness connector of the Heated Oxygen Sensor (HO2S) - G39-. Special tools and workshop equipment required Multimeter. Wiring diagram. Test requirements Fuse - S344- OK. Engine Component Power Supply Relay - J757- OK. Battery voltage at least 12.5 volts. All electrical consumers such as, lights and rear window defroster, switched off. Vehicles with automatic transmission, shift selector lever into position P or N. A/C switched off. Ground (GND) connections between engine/transmission/ chassis OK. Ignition switched off. Test procedure Perform a preliminary check to verify the customers complaint. Refer to page 20. Start diagnosis Perform the function test in Diagnostic Mode 06. Refer to page 8. If specified values are obtained: End diagnosis and switch the ignition off. If the specified values are not obtained: 3. Functions, Checking 191

14 Checking primary voltage Disconnect the Heated Oxygen Sensor (HO2S) - G39- electrical harness connector -2-. Start the engine. Using a multimeter, check the Heated Oxygen Sensor (HO2S) - G39- electrical harness connector terminals 1 to 5 for voltage. Specified value: to Volts Switch the ignition off. If the specified value was obtained: Replace the Heated Oxygen Sensor (HO2S) - G39-. Refer to Fuel Injection and Ignition Repair Manual. If the specified value was not obtained: Checking wiring If the manufacturers test box is being used. Perform the following step. Install the test box. Refer to Fuel Injection and Ignition Repair Manual If the manufacturers test box is not being used. Perform the following step. Remove the Engine Control Module (ECM) - J623-. Refer to 192 Rep. Gr.24 - Multiport Fuel Injection

15 Using a Multimeter, check the Heated Oxygen Sensor (HO2S) - G39- electrical harness connector terminals to the Engine Control Module (ECM) - J623- electrical harness connector T94 terminals for resistance. Heated Oxygen Sensor (HO2S) - G39- electrical harness connector terminals Engine Control Module (ECM) - J623- electrical harness connector T94 terminals or test box sockets Specified value: 1.5 Ω Max. If the specification was not obtained: Check the wiring for an open circuit, a short circuit to each other, Battery (+), and Ground (GND). Check the electrical harness connector for damage, corrosion, loose or broken terminals. If necessary, repair the faulty wiring connection. If no malfunction is detected in the wiring and the voltage supply was OK: Erase the DTC memory. Refer to page 8. Perform a road test to verify repair. If the DTC does not return: Repair complete, Generate readiness code. Refer to page 21. End diagnosis. If the DTC does return and no malfunction is detected in the wiring and the voltage supply was not OK: Replace the Engine Control Module (ECM) - J623-. Refer to Assembly is performed in the reverse of the removal. Final procedures After repair work, the following work steps must be performed in the following sequence: 1 - Check the DTC memory. page If necessary, erase the DTC memory. page If the DTC memory was erased, generate readiness code. page 21. End of diagnosis 3.2 Oxygen Sensor after Catalytic Converter, Checking Note Use only gold-plated terminals when servicing terminals in the electrical harness connector of the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) - G Functions, Checking 193

16 Special tools and workshop equipment required Multimeter. Wiring diagram. Test requirements Fuse - S344- OK. Engine Component Power Supply Relay - J757- OK. Battery voltage at least 12.5 volts. All electrical consumers such as, lights and rear window defroster, switched off. Vehicles with automatic transmission, shift selector lever into position P or N. A/C switched off. Ground (GND) connections between engine/transmission/ chassis OK. Ignition switched off. Test procedure Perform a preliminary check to verify the customers complaint. Refer to page 20. Start diagnosis Perform the function test in Diagnostic Mode 06. Refer to page 8. If specified values are obtained: End diagnosis and switch the ignition off. If the specified values are not obtained: Checking primary voltage Disconnect the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) - G130- electrical harness connector -1-. Switch the ignition on. 194 Rep. Gr.24 - Multiport Fuel Injection

17 Using a multimeter, check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) - G130- electrical harness connector terminals 3 to 4 for voltage. Specified value: to Volts Switch the ignition off. If the specified value was obtained: Replace the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) - G130-. Refer to Fuel Injection and Ignition Repair Manual. If the specified value was not obtained: Checking wiring If the manufacturers test box is being used. Perform the following step. Install the test box. Refer to Fuel Injection and Ignition Repair Manual If the manufacturers test box is not being used. Perform the following step. Remove the Engine Control Module (ECM) - J623-. Refer to 3. Functions, Checking 195

18 Using a Multimeter, check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) - G130- electrical harness connector terminals to the Engine Control Module (ECM) - J623- electrical harness connector T94 terminals for resistance. Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) - G130- electrical harness connector terminals Engine Control Module (ECM) - J623- electrical harness connector T94 terminals or test box sockets Specified value: 1.5 Ω Max. If the specification was not obtained: Check the wiring for an open circuit, a short circuit to each other, Battery (+), and Ground (GND). Check the electrical harness connector for damage, corrosion, loose or broken terminals. If necessary, repair the faulty wiring connection. If no malfunction is detected in the wiring and the voltage supply was OK: Erase the DTC memory. Refer to page 8. Perform a road test to verify repair. If the DTC does not return: Repair complete, Generate readiness code. Refer to page 21. End diagnosis. If the DTC does return and no malfunction is detected in the wiring and the voltage supply was not OK: Replace the Engine Control Module (ECM) - J623-. Refer to Assembly is performed in the reverse of the removal. Final procedures 1 - Check the DTC memory. page If necessary, erase the DTC memory. page If the DTC memory was erased, generate readiness code. page 21. End of diagnosis 196 Rep. Gr.24 - Multiport Fuel Injection

19 Note Always follow the manufacturers directions for the proper installation and operation of the Smoke tester being used. If a leak is detected: Check the fuel filler cap seal for damage and for proper installation. Replace if necessary. Check the seals under the locking flanges and the union nuts are properly tightened on the fuel tank. Check all hose connections of the fuel supply system and replace or repair any leaking lines. Check all hose connections of the EVAP system and replace or repair any leaking lines. Repair or replace any damaged component. If no leaks are found in the EVAP and Fuel Supply System: Erase the DTC memory if a DTC was set. Refer to page 8. Perform a road test to verify repair. If a DTC was set and does not return: Repair complete, Generate readiness code. Refer to page 21. End diagnosis. If the DTC does return and no leaks are found in the EVAP and Fuel Supply System: Check the DTC memory for any DTC codes pertaining to the EVAP and Fuel Supply Systems. If a DTC is stored, perform the diagnostic test procedure for the suspected component. Refer to page 6. End diagnosis. 2.3 EVAP Canister Purge Regulator Valve, Checking Special tools and workshop equipment required Multimeter. Wiring diagram. Test requirements Fuse - S345- OK. The Engine Component Power Supply Relay - J757- OK. The ignition switched off. Note Voltage for the Evaporative Emission (EVAP) Canister Purge Regulator Valve - N80- is supplied by the Engine Component Power Supply Relay - J757-. Test procedure Perform a preliminary check to verify the customers complaint. Refer to page Rep. Gr.20 - Fuel Supply

20 Start diagnosis Remove engine cover -arrows-. Disconnect the Evaporative Emission (EVAP) Canister Purge Regulator Valve - N80- electrical harness connector. Checking internal resistance Using a Multimeter, check the Evaporative Emission (EVAP) Canister Purge Regulator Valve - N80- terminals 1 and 2 for resistance. Specified value: 22,0 to 30,0 Ω. If the specified value is not obtained: Replace the Evaporative Emission (EVAP) Canister Purge Regulator Valve - N80-. If the specification is obtained: Checking voltage supply Using a Multimeter, check the electrical harness connector terminal 1 to Ground (GND) for voltage. Operate the starter briefly. Specified value: battery voltage. If the specified value is not obtained: Check the Evaporative Emission (EVAP) Canister Purge Regulator Valve - N80- electrical harness connector terminal 1 to the Engine Component Power Supply Relay - J757- terminal 2/87 for an open circuit, short circuit to each other, Battery (+), and Ground (GND). Check the electrical harness connector for damage, corrosion, loose or broken terminals. If necessary, repair the wiring connection. If the specified value was obtained: Checking wiring If the manufacturers test box is being used. Perform the following step. Install the test box. Refer to Fuel Injection and Ignition Repair Manual. If the manufacturers test box is not being used. Perform the following step. Remove the Engine Control Module (ECM) - J623-. Refer to 2. EVAP System 131

21 Using a Multimeter, check the Evaporative Emission (EVAP) Canister Purge Regulator Valve - N80- electrical harness connector terminal 2 to Engine Control Module (ECM) - J623- electrical harness connector T60 terminal 5 for resistance. Evaporative Emission (EVAP) Canister Purge Regulator Valve - N80- electrical harness connector terminal 2 5 Engine Control Module (ECM) - J623- electrical harness connector T60 terminal test box socket Specified value: 1.5 Ω max. If the specification is not obtained: Check the wiring for an open circuit, short circuit to each other, Battery (+), and Ground (GND). Check the electrical harness connector for damage, corrosion, loose or broken terminals. If necessary, repair the wiring connection. If the specification was obtained: Erase the DTC memory. Refer to page 8. Perform a road test to verify repair. If the DTC does not return: Repair complete, Generate readiness code. Refer to page 21. End diagnosis. If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK: Replace the Engine Control Module (ECM) - J623-. Refer to Assembly is performed in the reverse of the removal. Final procedures After repair work, the following work steps must be performed in the mentioned sequence: 1 - Check the DTC memory. page If necessary, erase the DTC memory. page If the DTC memory was erased, generate readiness code. page 21. End of diagnosis 2.4 Leak Detection Pump, Checking Special tools and workshop equipment required Multimeter. Wiring diagram. Test requirements Fuse - S345- OK. The Engine Component Power Supply Relay - J757- OK. The ignition switched off. 132 Rep. Gr.20 - Fuel Supply