AIR System Operation Inspection

WARNING: This page is about a different car, the 2004 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.

Fig 1: Locating Data Link Connector
Courtesy of MAZDA MOTORS CORP.
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 40-AIR pump relay terminal A)
When AIP RLY is turned from off to on, verify that the AIR pump relay and secondary injection pump can be heard operating.

Fig 2: Locating Air Pump Relay/Caption>
Courtesy of MAZDA MOTORS CORP.
- 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 40-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)
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.

Fig 3: Verifying Negative Pressure
Courtesy of MAZDA MOTORS CORP.
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)
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)
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 hour after air pump has energized for the AIR pump to 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)