AIR System Operation Inspection
WARNING: This page is about a different car, the 2005 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.
- Connect the WDS or equivalent to the DLC-2.
- Warm up the engine to normal operating temperature.
- Verify that AIR pump is not operating when idling.
- If the AIR pump is operating, inspect the following items and repair or replace the malfunctioning location.
- AIR pump relay stuck closed
- Short circuit of the wiring harness to ground system (PCM terminal 4O-AIR pump relay terminal A)
- If the AIR pump is operating, inspect the following items and repair or replace the malfunctioning location.
- When AIP RLY is turned from off to on, verify that the AIR pump relay and secondary injection pump can be heard operating.
- If there is no sound of operation from the AIR pump relay, inspect the following items and repair or replace the malfunction part.
- AIR pump relay stuck open
- Wiring harness, connectors: open circuit (PCM terminal 4O-AIR pump)
- Wiring harness, connector: open circuit (main relay terminal D-AIR pump relay terminal A)
- If there is no sound of operation from the AIR pump, inspect the following items and repair or replace the malfunction part.
- Wiring harness, connectors: open or short circuit (Battery-AIR pump relay-AIR pump terminal A)
- Wiring harness, connectors: open or short circuit (AIR pump terminal B-ground)
- If there is no sound of operation from the AIR pump relay, inspect the following items and repair or replace the malfunction part.
- Inspect the discharging pressure of the AIR pump. (See
DISCHARGING PRESSURE INSPECTION .)
- If the discharging pressure is not as specified, replace the AIR pump.
- Remove the vacuum hose connected to the AIR control valve.
- Verify that vacuum hose removed when idling is not pressurized with negative pressure.
- If the negative pressure can be verified, perform the following inspections and repair or replace the malfunction part.
- AIR solenoid valve stuck open
- Wiring harness, connectors to ground: short circuit (PCM terminal 1O-AIR solenoid valve terminal B)
- If the negative pressure can be verified, perform the following inspections and repair or replace the malfunction part.
- Verify that there is negative pressure when the AIR solenoid valve is turned on from off using the simulation function PACTNV.
- If the negative pressure cannot be verified, perform the following inspections and repair or replace the malfunction part.
- AIR solenoid valve stuck closed
- Wiring harness, connectors: open circuit (PCM terminal 1O-AIR solenoid valve terminal B)
- Vacuum hose between intake manifold, vacuum tank, AIR solenoid valve, and AIR control valve (clog, leakage, damage, poor connection)
- If the negative pressure cannot be verified, perform the following inspections and repair or replace the malfunction part.
- Monitor the following PIDs using the monitor function.
- Heated oxygen sensor (front) (WDS PID: O2S11)
- AIR pump relay (WDS PID: AIP_RLY)
- Warm up the engine.
- Connect the vacuum pump to the AIR control valve.
- Operate the AIR pump using the simulation function AIP_RLY.CAUTION:
- Do not operate the AIR pump for more than 1 min to avoid damaging the pump.
- Allow 1 h after energizing for the AIR pump to cool down before operating it again.
- Inspect the following immediately to prevent the catalyst from becoming overheated.
- Verify that the PID O2S11 shows a lean value when pressurizing the AIR pump using a vacuum pump while idling.
- If a lean value for the PID O2S11 cannot be confirmed, inspect the following items and repair or replace the applicable part.
- AIR control valve operation malfunction. (See SECONDARY AIR INJECTION (AIR) CONTROL VALVE INSPECTION .)
- Channel between AIR pump and exhaust manifold (clog, leakage)
- If a lean value for the PID O2S11 cannot be confirmed, inspect the following items and repair or replace the applicable part.