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Home >> Mazda >> 2003 >> MPV ES >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0133 Or DTC P0153 >> Diagnostic Procedures
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Diagnostic Procedures

  1. Record freeze frame data. Check for service bulletins and on-line information. Repair as necessary. After repair, go to next step.
  2. Verify Related Pending & Stored DTCs -  Turn ignition off, then on (engine off). Using scan tool, verify stored DTCs. If DTCs P0442 or P0443 with P0133 or P0153 are present, repair those DTC(s) first. After repair, go to step  13. If listed DTCs are not present, go to next step.
  3. Identify Trigger DTC For FREEZE FRAME DATA -  Verify if DTCs P0133 and/or P0153 are present on FREEZE FRAME DATA. If DTC is present, go to next step. If DTC P0133 and/or P0153 are not present, perform diagnostic procedures for DTC that is on FREEZE FRAME DATA. Refer to DIAGNOSTIC TROUBLE CODE IDENTIFICATION .
  4. Verify Current Input Signal Status -  Warm engine to normal operating temperature. Using scan tool, access O2S11 (P0133) or O2S21 (P0153) PIDs. Check PID under following pedal conditions in park:
    • PID reading is more than 0.55 volt when accelerator is suddenly depressed (rich condition).
    • PID reading is less than 0.55 volt just after accelerator pedal is released (lean condition).

    If PID readings are as specified, go to step  7. If PID values are not as specified, go to next step.

  5. Inspect Gas Leakage From Exhaust System -  Check front HO2S installation. If front HO2S is tight, go to next step. If front HO2S is loose, tighten front HO2S. After repair, go to step  13.
  6. Inspect Installation Of Front HO2S -  Check for exhaust leak upstream from front HO2S. If no leaks are found, replace front HO2S. After repair, and go to step  13. If any exhaust leaks are found, repair or replace faulty exhaust system parts. After repair, go to step  13.
  7. Inspect Long Term Fuel Trim -  Using scan tool, access LONGFT1 (P0133) or LONGFT2 (P0153) PIDs. Compare with FREEZE FRAME DATA recorded in step 1). If PID values are less than FREEZE FRAME DATA (engine is driven under rich condition). Go to next step. If PID values are more than FREEZE FRAME DATA (engine is driven under lean condition). Go to step  9.
  8. Inspect Fuel Line Pressure (Excessive Fuel Line Pressure) -  Turn ignition off. Check fuel line pressure with engine running. See FUEL PRESSURE (EXCEPT B2300, B3000, B4000 & TRIBUTE under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article. If fuel pressure is 61-66 psi (420-460 kPa), go to next step. If fuel pressure is not as specified, check fuel pump maximum pressure and fuel return line for clogging. See FUEL PRESSURE (EXCEPT B2300, B3000, B4000 & TRIBUTE under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article. Repair or replace as necessary. If no problem is found, replace fuel pressure regulator. After repair, go to step  13.
  9. Inspect Fuel Line Pressure (Low Fuel Line Pressure) -  Turn ignition off. Check fuel line pressure with engine running. See FUEL PRESSURE (EXCEPT B2300, B3000, B4000 & TRIBUTE under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article. If fuel pressure is 61-66 psi (420-460 kPa), go to step  13. If fuel pressure is not as specified, go to next step.
  10. Inspect Fuel Pump Maximum Pressure -  Perform fuel pump maximum pressure test. See FUEL PRESSURE (EXCEPT B2300, B3000, B4000 & TRIBUTE under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article. If fuel pump maximum pressure is 86-116 psi (590-800 kPa), go to next step. If fuel pressure is not as specified, check open or poor connection in fuel pump circuit. If fuel pump circuit is okay, replace fuel pump. Repair as necessary. After repair, go to step  13.
  11. Inspect Fuel Line From Fuel Pump To Fuel Delivery Pipe -  Check fuel lines for leaks. If any leaks are present, replace leaking fuel line. After repair, go to step  13. If no leaks are found, check high pressure fuel filter for clogging or restriction. Check low pressure fuel filter for foreign materials or stain inside filter. If high pressure fuel filter is clogged or restricted, replace high pressure fuel filter. If foreign material is found inside low pressure fuel filter. Clean fuel tank and filter. If both fuel filters are okay, replace fuel pressure regulator. After repair, go to step  13.
    WARNING: Removing radiator cap when radiator is hot is dangerous. Scalding coolant and steam may shoot out and cause serious injury. When removing radiator cap, wrap a thick cloth around and turn it slowly.
    NOTE: Large bubbles are normal since they are remaining air coming out from engine coolant passage.
  12. Inspect Sealing Of Engine Coolant Passage -  Check cooling system for combustion gasses. Remove radiator cap. Bleed air from cooling system. Start engine and let idle. Check for small bubbles which make coolant white at filler neck. If combustion gasses are not present, go to next step. If combustion gasses are present, repair leak as necessary and go to next step.
  13. Verify Trouble Shooting Of DTC P0133 Or P0153 Completed -  Reconnect all components. Turn ignition on, engine off. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine and perform MODE 1 - PCM ADAPTIVE MEMORY PRODUCE DRIVE MODE  and MODE 3 - HO2S HEATER, HO2S & TWC REPAIR VERIFICATION DRIVE MODE  under DRIVE MODES. Stop vehicle. Access ON BOARD SYSTEM READINESS TEST to inspect DRIVE MODE completion status. Ensure Readiness Function Check (RFC) flag changes to YES for oxygen sensor. If RFC flag does not change, run DRIVE MODE again. Verify following TEST # values in DIAGNOSTIC MONITORING TEST RESULTS:
    • For DTC P0133 - 10:01:11, 10:02:11 or 10:03:11.
    • For DTC P0153 - 10:01:21, 10:02:21 or 10:03:21.

    If all tests are not less than MAX value, go to next step. If all tests are less than MAX value, replace PCM. After repair, go to next step.

  14. Verify After Repair Procedure -  Perform after repair procedure. See AFTER REPAIR PROCEDURE . If DTC is not present, testing is complete. If any DTC is present, go to appropriate test for diagnosis and repair.
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