1981 Mazda B2000 BaseFACTORY OEM SERVICE PROCEDURE

All Other Models

  1. Warm engine to normal operating temperature. Stop engine and disconnect air pump-to-air control valve hose at air control valve. Start engine and run at idle speed. Disconnect outlet hose from air control valve. Disconnect vacuum sensing tubes from No. 1 and No. 2 relief valves (No. 1 relief valve only on 626). Air should be discharged at air control valve outlet port.
  2. On 626 models, reconnect vacuum sensing tube to No. 1 relief valve. On all others, connect No. 1 relief valve directly to inlet manifold vacuum with additional tubing. Air should not be discharged from air control valve outlet port.
  3. On 626 models, disconnect No. 2 relief valve-to-vacuum pipe hose at vacuum pipe. Disconnect No. 1 relief valve-to-intake manifold hose at air control valve and install "T" fitting. Connect additional tubing between "T" fitting and No. 1 relief valve. Connect No. 2 relief valve-to-vacuum pipe hose to "T" fitting. Air should be discharged at air control valve outlet port. Disconnect and plug vacuum sensing tube from No. 2 relief valve. Air should not be discharged from air control valve outlet port.
    Fig 1: Air Control Valve (Exc. B2000)
    G09313928Courtesy of MAZDA MOTORS CORP.
  4. On all other models, connect No. 2 relief valve directly to inlet manifold vacuum with additional tubing (No. 1 relief valve still connected to inlet manifold vacuum). Air should be discharged from air control valve outlet port.
  5. On all models, if air control valve, No. 1 relief valve or No. 2 relief valve do not respond as outlined, replace air control valve assembly.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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