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Home >> Mazda >> 2002 >> MX-5 Miata Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0134: Front Heated Oxygen Sensor Circuit No Activity Detected >> Diagnostic Procedure

Diagnostic Procedure

  1. Turn ignition off. Connect New Generation Star (NGS) tester or equivalent to OBD-II Data Link Connector-2 (DLC-2). See Figure. Turn ignition on. Retrieve pending and stored DTCs. If other DTCs are present except P0131 and P0132, follow appropriate DTC diagnostic procedure. Also monitor for FREEZE FRAME DATA and ensure data has been recorded. Check for service bulletins and/or other line of repair information related to DTC P0134. If repair information is available, perform diagnosis and repair as necessary. After repair, go to step  7. If repair information is not available, go to next step.
  2. Check for triggered DTC on recorded FREEZE FRAME DATA. If malfunction code recordedis P0134, go to next step. If malfunction code recordedis different that P0134, follow appropriate DTC diagnostic procedure.
  3. Start engine and let it idle until it reaches normal operation temperature. Using NGS tester or equivalent, access O2S11 PID. Verify O2S11 PID while racing engine (in PARK). Ensure that each value is within following conditions:
    • More than 0.45 volts. when suddenly depressing accelerator pedal (rich condition).
    • Less than 0.45 volts. just after release of accelerator pedal (lean condition).

    If O2S11 PID readings are as specified, go to next step. If any O2S11 PID reading is not as specified, replace front HO2S. After repair, go to step  7.

  4. Turn ignition off. Inspect front HO2S for proper installation. Also check for exhaust leakage between exhaust manifold and front HO2S. If no problem is found, go to next step. If problem is found, reinstall and secure front HO2S and/or repair exhaust leak as necessary. After repair, go to step  7.
  5. Ensure to let engine cool down before performing this test. Remove radiator cap by using thick cloth around it and turning slowly. Implement procedure to bleed air from engine coolant system. Start engine and let it idle. If any small air bubbles which makes engine coolant white at filler opening is found, determine source of air leak into cooling system (possible poor sealing of cylinder head gasket), repair and replace faulty components. After repair, go to step  7. If sealing of engine coolant passage is okay, go to next step.
  6. Return vehicle to original condition. Perform engine compression test. For proper engine compression test. See COMPRESSION under PRELIMINARY INSPECTION & ADJUSTMENTS in BASIC DIAGNOSTIC PROCEDURES article. Compression should be about 198 psi (13.9 kg/cm2 ) at 300 RPM. If engine compression is as specified, go to next step. If engine compression is not as specified, determine source of low compression. Repair as necessary and go to next step.
  7. Return vehicle to original condition. Using NGS tester or equivalent, clear DTCs from PCM memory. Start engine and access ECT PID. Let engine idle until ECT PID is above 158°F (70°C). Increase and keep engine speed above 1500 RPM for at least one minute. Monitor for pending DTCs. If same DTC P0134 is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL, OVERHAUL & INSTALLATION article. If any other DTC is present, follow appropriate DTC diagnostic procedure.
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