System Check - Secondary Air Injection

Diagnostic Chart:

Circuit Description
A fused ignition voltage is supplied to the Air Injection Reaction (AIR) relay. The VCM controls the AIR pump by grounding the AIR relay control circuit. This energizes the relay and supplies voltage to the AIR pump clutch. When the fuel system goes to the Closed Loop mode, the VCM opens the ground to the AIR control circuit.

Diagnostic Aids

An intermittent may be caused by a poor connection, rubbed through wire insulation, or a broken wire inside the insulation.

Check for the following conditions:

^ Poor connection or damaged harness Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection, and a damaged harness.

^ Worn or loose AIR pump drive belt.

^ Pinched, kinked, or restricted AIR pipes, hoses, or fittings.

Test Description

Number(s) below refer to step numbers on the Diagnostic Table

2. This step will determine if the VCM is capable of controlling the AIR system.

3. Leaks in the AIR system may affect other sensor operations.