Audi A6 C5 4.2L V8 5V BAS Secondary Air Injection Maintenance

The secondary air system is designed to enable catalytic converter to heat up and reach its operating temperature more quickly after a cold start.
Principle of operation
Due to extra mixture enrichment during cold-start phase, an increased amount of unburnt hydrocarbons is carried in exhaust gas. The secondary air system improves the afterburning (oxidation) process in the catalytic converter, and in this way reduces toxic emissions. Heat generated by oxidation accelerates "light off" of catalytic converter and significantly improves exhaust gas quality during warm-up.

1989-1996 Dodge Dakota Trucks Ignition Coil Tests

The ignition coil for the vehicles covered by this guide is in the following locations:
• 1989-92 engines: mounted to the firewall
• 1993-96 2.5L engines: mounted on the thermostat housing in front of the coolant temperature sensor
• 1993-96 V6 and V8 LDC engines: mounted to a bracket bolted to the right engine cylinder head
• 1993-96 5.9L HDC engines: mounted to a bracket bolted to the air injection pump (AIR pump) mounting bracket.

1999 Mercedes Benz Truck ML 430 Air Injection Pump Operation

M33 AIR pump Engine 104, 111, 112, 113, 119, 137,166: When actuating, the voltage supply of the engine is performed via the air injection relay. Engine 104, 120: When actuating, the electromagnetic clutch air pump is actuated by force. Work instructions NOTE: Trim panel of cylinder head cover or air cleaner take off. Bolt (5) unscrew Refer to Air Pump NOTE: Pay attention to ground cable. 5/1 Air hose detach. M33

1999 Mercedes Benz Truck ML 430 Diagnostic Trouble Code (DTC)

Secondary Air Injection : Malfunction (Functional Chain)
Test 1 Test secondary air injection (function chain). (only (USA), EURO 3)
Test 2 Check component M33 (electric air pump). (only (USA), EURO 3)
Test 3 Check component Y32 (Air pump switchover valve). (only (USA), EURO 3)
1 Test secondary air injection (function chain). (only (USA), EURO 3)