1998-2000 Volkswagen Golf 4 Owners Manual

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1998-2000 Volkswagen Golf 4 Air Injection system Service Repair Manual. The Secondary Air Injection system blows in air behind the exhaust valves during cold start (+5 C to +33 C Engine Coolant Temperature) for 100 seconds, maximum. This produces an oxygen-rich exhaust gas, causing after burning and reducing the duration of the catalyst heat-up phase. Activation is initiated by the Motronic Engine Control Module -J220- via the Secondary Air Injection pump relay -J229- to the Secondary Air Injection solenoid valve -N112-1) and combivalve. Also, after each subsequent engine start (up to a 96 C max. Engine Coolant Temperature), the Secondary Air Injection system will switch on for 10 seconds during idle and is then monitored by the system. During this procedure the oxygen sensor must be active. Secondary Air Injection system components, removing and installing Repair Manual, 2.0 Liter 4-Cyl. 2V Fuel Injection & Ignition, Engine Code(s): AEG, Repair Group 01 Repair Manual, 2.0 Liter 4-Cyl. 2V Fuel Injection & Ignition, Engine Code(s): AVH, Repair Group 01 Repair Manual, 2.0 Liter 4-Cyl. 2V Fuel Injection & Ignition, Engine Code(s): AEG, Repair Group 01 Repair Manual, 2.0 Liter 4-Cyl. 2V Fuel Injection & Ignition, Engine Code(s): AVH, Repair Group 01 . Perform output diagnostic test and check activation of Secondary Air Injection pump motor relay -J299. Repair Manual, 2.0 Liter 4-Cyl. 2V Fuel Injection & Ignition, Engine Code(s): AVH, Repair Group 01Connect V.A.G 1527 B Voltage Tester to disconnected connector using jumper wires from VW 1594 Adaptor kit. – Start engine and let idle. LED must light up. – Replace Secondary Air Injection solenoid valve -N112- Page 26-25 (item 2 ). – Connect 2-pin harness connector. – Perform output diagnostic test and check activation of Secondary Air Injection solenoid valve N112. Readiness code must be reset if ECM is subject to low voltage with ignition ON or if DTC memory is erased. Remove pressure hose between Secondary Air Injection pump motor -V101- and combi-valve from combi-valve.

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