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Power Steering Pressure Switch: Miata

WARNING: This page is about a different car, the 2003 Mazda Protege5, 2003 Mazda Protege, 2003 Mazda MX-5 Miata, 2003 Mazda MPV, and 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

  1. Continuity Inspection

    Disconnect Power Steering Pressure (PSP) switch single pin harness connector. Connect ohmmeter between PSP switch terminal and ground. Start engine and operate at idle. Turn steering wheel from side to side and observe ohmmeter. Continuity should be present when steering wheel is turned. Continuity should not be present when steering wheel is in straight ahead position. If continuity is not as specified, replace PSP switch.

  2. Open Circuit Inspection

    Check for continuity in following circuits:
    • Power circuit - PSP switch harness connector terminal (Brown wire) and PCM 31-pin harness connector terminal No. 4C.
    • GND circuit - PSP switch body and ground.

    If continuity is present, go to next step. If continuity is not present, repair open circuit in Brown wire between PSP switch harness connector and PCM 31-pin harness connector terminal No. 4C. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS.

  3. Short Circuit Inspection

    Check for continuity in Brown wire between PSP switch harness connector terminal and PCM 31-pin harness connector terminal No. 4C to ground. If continuity is present, repair short circuit to ground in Brown wire between PSP switch harness connector and PCM 31-pin harness connector terminal No. 4C.
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