Secondary Air Injection Pump Relay -J299- / secondary Air Injection Pump Motor -V101-, CHECKING: Function

Injecting additional air into the exhaust pipe triggers an exothermic reaction. This leads to the combustion of HC and CO components that prevail mainly during the warm up phase. This oxidation process releases additional heat. Consequently, the exhaust gas becomes hotter, causing the catalytic converter to heat up at a faster rate. For spark-ignition engines, secondary-air injection is an effective means of reducing HC and CO emissions after starting the engine and to rapidly heat up the catalytic converter. This ensures that the conversion of NOx emissions commences earlier.

Special tools and workshop equipment required 

• Multimeter
• Wiring Diagram
• Scan Tool