System, Checking - VAG Links

Secondary Air Injection (AIR) system, checkingPage 1 of e SecondaryAir Injection(AIR) systemcauses thecatalyticconverter to heatup more quickly,resulting inearlier operatingreadinessfollowing coldstart.PrincipleDue to overenrichment ofthe mixtureduring the coldstart phase,there is anincreasedamount ofuncombustedcarbonmonoxide in theexhaust.Secondary AirInjection (AIR)improvessecondaryoxidation in thecatalyticconverter andthereforereducesemissions. Theheat producedby secondaryoxidation greatlyreduces ?action Goto&target top&type repair&id. 27/02/2005

Secondary Air Injection (AIR) system, checkingPage 2 of 21time for thecatalyticconverter,thereforeimprovingexhaust qualityduring the coldstart let/Display?action Goto&target top&type repair&id. 27/02/2005

Secondary Air Injection (AIR) system, checkingPage 3 of 2126-30FunctionIn the coldstart phase,the ECM -2activatesthesecondaryair pump 12- via therelay forSecondaryAir Injection(AIR) pump-1-. Airreaches thecombinationvalve forSecondaryAir Injection(AIR) -10-.TheSecondaryAir Injection(AIR) valve-3- isactivated inparallel,whichallows thevacuum toreach thecombinationvalve forSecondaryAir Injection(AIR) -10and thevacuumdiaphragmfor chargeair pressureregulation 7-. Thecombinationvalve forSecondaryAir isplay?action Goto&target top&type repair&id. 27/02/2005

Secondary Air Injection (AIR) system, checkingPage 4 of 21therebyopens thepath forsecondaryair to theexhaustchannels ofthe splay?action Goto&target top&type repair&id. 27/02/2005

Secondary Air Injection (AIR) system, checkingPage 5 of 2126-31To preventunnecessaryheating,secondaryair isdivertedpassed theturbocharger-8-. For this,the chargeair pressureregulationpressureunit opensthe chargeair pressurevalve. Thepressureunit,designed asa doublereservoir,has avacuumconnectionfor this onthe intakeside.1 - SecondaryAirInjection(AIR)pumprelayJ2992 - MotronicEngineControlModule(ECM) J2203 - SecondaryAirInjection(AIR)solenoidvalve tion Goto&target top&type repair&id. 27/02/2005

Secondary Air Injection (AIR) system, checkingPage 6 of 214 - isplay?action Goto&target top&type repair&id. 27/02/2005

Secondary Air Injection (AIR) system, checkingPage 7 of 2126-325 - oints indirectionof flow,as shownin figure.6 - Vacuumreservoir7 - Pressureunit forcharge airpressureregulation8Turbocharger9 - Cylinderhead10 Combination- valve forsecondaryair injection(AIR)11 - Air filterhousing12 - SecondaryAirInjection(AIR)pumpmotor tion Goto&target top&type repair&id. 27/02/2005

Secondary Air Injection (AIR) system, checkingPage 8 of 2126-33SecondaryAir Injection(AIR)solenoidvalve N112 -,checkingSpecial toolsand - servlet/Display?action Goto&target top&type repair&id. 27/02/2005

Secondary Air Injection (AIR) system, checkingPage 9 of 2126-34Component locationlocationsOverview of componRepair Manual , 1.8 Liter 4-Cyl. 5V TurboInjection & Ignition, Engine Code(s): AMU,Repair Group 24, Fuel preparation, injectionTest requirement:Output Diagnostic Test Mode (DTM)performedChecking internal resistance- Disconnect harness connector from SecoAir Injection (AIR) valve N112-.- Connect multimeter at valve for resistancmeasurement.Specified value: 25 - 35- If specified value is not obtained, replaceSecondary Air Injection (AIR) solenoid ?action Goto&target top&type repair&id. 27/02/2005

Secondary Air Injection (AIR) system, checkingPage 10 of 2126-35Checking voltage supply- Disconnect harness connector from SecoAir Injection (AIR) valve N112-.- Connect VAG1527B voltage tester as follHarness connectorMeasure toterminal1Engine Ground (GN- Operate starter briefly (engine can also sLED must light up.If LED does not light up:- Perform the following tests marked with dCheck fuse -S243- (in fuse holder, tion Goto&target top&type repair&id. 27/02/2005

Secondary Air Injection (AIR) system, checkingPage 11 of 2126-36Check wire connection fromterminal 1 of connector via fuse S243- (in fuse holder, socket 43)to Fuel Pump (FP) relay foropen circuit:Electrical Wiring Diagrams,Troubleshooting & ComponentLocationsCheck Fuel Pump (FP) relayRepair Manual , 1.8 Liter 4-Cyl.5V Turbo Fuel Injection & Ignition,Engine Code(s): AMU, Repair Group24, Fuel preparation, injectionChecking activation- Connect VAG1527B voltagetester as follows:Harness connector Measure toterminal2B http://127.0.0.1:8080/audi/servlet/Display?action Goto&target top&type repair&id. 27/02/2005

Secondary Air Injection (AIR) system, checkingPage 12 of 2126-37- Initiate output Diagnostic Test Mode (DTactivate Secondary Air Injection (AIR) sovalve N112Repair Manual , 1.8 Liter 4-Cyl. 5V TurbInjection & Ignition, Engine Code(s): AMU,Repair Group 24, Fuel preparation, injectioIndicated on displayOutput Diagnostic Test ModeSecondary air injection solenoid valve -N112LED must blink.If LED does not blink or if it remains consta- Connect VAG1598/31 test box at wiringto ECM, do not connect ECM.Repair Manual , 1.8 Liter 4-Cyl. 5V TurbInjection & Ignition, Engine Code(s): AMU,Group 24, Fuel preparation, injection- Check the following wire connections forcircuit and short circuit to Ground (GND)Harness connector VAG 1598/31 testiterminalBushing29- Repair open circuit or short circuit if nece- If wire connection is OK: Replace EngineControl Module (ECM)Repair Manual , 1.8 Liter 4-Cyl. 5V TurbInjection & Ignition, Engine Code(s): AMU,Group 24, Fuel preparation, y?action Goto&target top&type repair&id. 27/02/2005

Secondary Air Injection (AIR) system, checkingPage 13 of 2126-38SecondaryAir Injection(AIR) pumprelay -J299andactivation,checkingSpecial 1http://127.0.0.1:8080/audi/servlet/Display?action Goto&target top&type repair&id. 27/02/2005

Secondary Air Injection (AIR) system, checkingPage 14 of 2126-39Component locationlocationsOverview of componentRepair Manual , 1.8 Liter 4-Cyl. 5V Turbo FuelInjection & Ignition, Engine Code(s): AMU,Repair Group 24, Fuel preparation, injection- Initiate output Diagnostic Test Mode (DTM) andactivate Secondary Air Injection (AIR) pumprelay -J299Repair Manual , 1.8 Liter 4-Cyl. 5V Turbo FuelInjection & Ignition, Engine Code(s): AMU,Repair Group 24, Fuel preparation, injectionSecondary Air Injection (AIR) pump relay(under cover, left at bulkhead) must triggerand the Secondary Air Injection (AIR) pumpmotor -V101- must run.A - If relay does not trigger:- Check voltage supply of the Secondary AirInjection (AIR) pump relay Page 26-40 .- Check activation of the Secondary Air Injection(AIR) pump relayPage 26-42 .B - If relay triggers, but Secondary Air Injection(AIR) pump does not run:- Check voltage supply of the Secondary AirInjection (AIR) pump motor Page 26-43 .http://127.0.0.1:8080/audi/servlet/Display?action Goto&target top&type repair&id. 27/02/2005

Secondary Air Injection (AIR) system, checkingPage 15 of 2126-40Checking voltage supply of Secondary AInjection (AIR) pump relay- Switch ignition off.- Remove Secondary Air Injection (AIR) purelay- Connect multimeter for voltage measuremfollows:Relay carrier below cover,left at bulkheadMeasureterminal1Engine G(GNDSpecified value: approx. battery voltaIf specified value is not obtained:- Perform the following tests marked with dCheck fuse -S131- (50 A) in main fusebox/battery.Check wire connection from B (terminafuse -S131- for Secondary Air Injectionpump relay -J299- (below cover, left atbulkhead) for open circuit.Electrical Wiring Diagrams, TroubleshooComponent y?action Goto&target top&type repair&id. 27/02/2005

Secondary Air Injection (AIR) system, checkingPage 16 of 2126-41- Connect multimeter for voltage measuremfollows:Relay carrier below cover,left at bulkheadMeasureterminal3Engine G(GND- Operate starter briefly (engine can also sSpecified value: approx. battery voltaIf specified value is not obtained:- Perform the following tests marked with dCheck fuse -S243- (in fuse holder, positCheck wire connection from B (terminafuse -S131- for Secondary Air Injectionpump relay -J299- (below cover, left atbulkhead) for open circuit.Electrical Wiring Diagrams, TroubleshooComponent y?action Goto&target top&type repair&id. 27/02/2005

Secondary Air Injection (AIR) system, checkingPage 17 of 2126-42Check activation of the Secondary AirInjection (AIR) pump relay- Switch ignition off.- Remove Secondary Air Injection (AIR) pumprelay- Connect multimeter for voltage measurement asfollows:Relay carrier below cover, left atbulkheadMeasuretoterminal4B - Initiate output Diagnostic Test Mode (DTM) andactivate Secondary Air Injection (AIR) pumprelay -J299Repair Manual , 1.8 Liter 4-Cyl. 5V Turbo FuelInjection & Ignition, Engine Code(s): AMU,Repair Group 24, Fuel preparation, injectionSpecified value: approx. battery voltageIf specified value is not obtained:- Switch ignition off.- Connect VAG1598/31 test box at wiring harnessto ECM, do not connect ECM.Repair Manual , 1.8 Liter 4-Cyl. 5V Turbo FuelInjection & Ignition, Engine Code(s): AMU,Repair Group 24, Fuel preparation, y?action Goto&target top&type repair&id. 27/02/2005

Secondary Air Injection (AIR) system, checkingPage 18 of 2126-43- Check the following wire connection for opencircuit and short circuit to Ground (GND) and B :Relay carrier below cover,left at bulkheadterminalVAG 1598/31testing boxBushing466- Repair open circuit or short circuit ifnecessary.If no malfunctions are detected:- Replace Secondary Air Injection (AIR) pumprelay -J299-.Check voltage supply of the Secondary AirInjection (AIR) pump motor- Remove connector for Secondary Air Injection(AIR) pump motor -V101-.- Connect VAG1527B voltage tester betweenterminals 1 and 2- Initiate output Diagnostic Test Mode (DTM) andactivate Secondary Air Injection (AIR) pumprelay -J299Repair Manual , 1.8 Liter 4-Cyl. 5V Turbo FuelInjection & Ignition, Engine Code(s): AMU,Repair Group 24, Fuel preparation, injectionLED must light on Goto&target top&type repair&id. 27/02/2005

Secondary Air Injection (AIR) system, checkingPage 19 of 2126-44If LED does not light up:- Perform the following tests marked with dots:Check wire connection from connector atSecondary Air Injection (AIR) pump motor V101- to Secondary Air Injection (AIR) pumprelay -J299- (in relay carrier below cover, leftat bulkhead) for open circuit:Electrical Wiring Diagrams, Troubleshooting &Component LocationsCheck wire connection from connector atSecondary Air Injection (AIR) pump motor V101- to Ground (GND) point in enginecompartment, left, for open circuit:Electrical Wiring Diagrams, Troubleshooting &Component LocationsIf no malfunctions are detected:- Replace Secondary Air Injection (AIR) pumpmotor action Goto&target top&type repair&id. 27/02/2005

Secondary Air Injection (AIR) system, checkingPage 20 of 2126-45Secondary air systemcomponents, removing andinstalling- Testing secondary air systemRepair Manual. 1.8 Liter 4-Cyl. 5VTurbo Fuel Injection & Ignition,Engine Code(s): AMUA- Secondary air pump motor- Remove center section of noiseinsulation.- Disconnect hoses and connectorson secondary air pump- Remove secondary air ion Goto&target top&type repair&id. 27/02/2005

Secondary Air Injection (AIR) system, checkingPage 21 of 2126-46B- Mechanical secondary air valve(combination valve)- Remove engine cover panel.- Disconnect vacuum hose -1- andconnecting pipe -2- atcombination valve.- Unbolt combination valve frombracket y?action Goto&target top&type repair&id. 27/02/2005

Electrical Wiring Diagrams, Troubleshooting & Component Locations Check wire connection from connector at Secondary Air Injection (AIR) pump motor - V101- to Ground (GND) point in engine compartment, left, for open circuit: Electrical Wiring Diagrams, Troubleshooting & Component Locations If no malfunctions are detected: