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Home >> Mazda >> 2001 >> B2500 SE, Automatic >> Repair and Diagnosis (Single Page) >> External Pages >> Different car >> Section 280 (Symptom Troubleshooting [Engine Control System 13B-MSP)) >> Engine Control System Operation Inspection >> Main Relay Operation Inspection
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Main Relay 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.
  1. Verify that the main relay clicks when the ignition switch is turned to the ON position and off.
    • If there is no operation sound, inspect the following:
      • Main relay (See MAIN RELAY OPERATION INSPECTION .)
      • Wiring harness and connector between battery and main relay terminal A.
      • Wiring harness and connector between PCM terminal 5AC, 5AF and main relay terminal C.
      • Wiring harness and connector between PCM terminal 4E and main relay terminal E.
      • Wiring harness and connector between PCM terminal 4Q and engine fuse.
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