LEMON Manuals: Even more car manuals for everyone
Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 60 (Engine Controls [Self-Diagnostics 2.3L]) >> Diagnostic Tests >> DTC P0133: Front Heated Oxygen Sensor Circuit - Slow Response >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
  1. If FREEZE FRAME DATA has been recorded, go to next step. If FREEZE FRAME DATA has not been recorded, record FREEZE FRAME DATA. Go to next step.
  2. Verify Related Repair Information Availability -  Check for related Service Bulletins and/or on-line repair information availability. If any related repair information is available, perform repair or diagnosis according to available repair information. If vehicle is not repaired, go to next step. If related repair information is not available, go to next step.
  3. Inspect For Other DTCs -  Check for other DTCs, using WDS or equivalent. If no other DTCs are present, go to next step. If other DTCs have been stored, repair circuit malfunction for applicable DTCs. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  4. Identify Trigger DTC For FREEZE FRAME DATA -  If DTC P0133 is present on FREEZE FRAME DATA, go to next step. If any other DTC triggered FREEZE FRAME DATA, diagnose that DTC first. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  5. Verify Current Input Signal Status -  Warm up engine. Access O2S11 PID using WDS or equivalent. Check PID under following accelerator pedal conditions (in PARK (ATX) or NEUTRAL (MTX)).
    • More Than 0.55 volt  when suddenly depressing accelerator pedal (rich condition)
    • Less Than 0.55 volt  just after release of accelerator pedal (lean condition)
    If PID reading is not okay, go to next step. If PID reading is okay, go to step  8.
  6. Inspect Installation Of Front HO2S -  Check if front HO2S is loosely installed. If front HO2S is installed securely, go to next step. If front HO2S is not installed securely, retighten front HO2S. After repair, go to step  13.
  7. Inspect Gas Leakage From Exhaust System -  Visually check if any gas leakage is found between exhaust manifold and front HO2S. If exhaust gas leak is not present, replace front HO2S. After repair, go to step  13. If any exhaust gas leakage is present, repair or replace any faulty exhaust system component. After repair, go to step  13.
  8. Inspect Long Term Fuel Trim -  Access LONGFT1 PIDs. Compare it with FREEZE FRAME DATA recorded at step  1. If LONGFT1 PID value less than FREEZE FRAME DATA value, engine is driven under rich condition. Go to next step. If LONGFT1 PID value is not less than FREEZE FRAME DATA value, engine is driven under lean condition. Go to step  9.
  9. Inspect Fuel Line Pressure (Excessive Fuel Line Pressure) -  Turn ignition off. Inspect fuel line pressure while engine is running. Refer to FUEL PRESSURE (EXCEPT B2300, B3000, B4000 & TRIBUTE) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article. If fuel line pressure is okay, go to next step. If fuel line pressure is excessive, replace fuel pump. After repair, go to step  13.
  10. Inspect Fuel Line Pressure (Low Fuel Line Pressure) -  Turn ignition off. Inspect fuel line pressure while engine is running. If fuel line pressure is low, go to next step. If fuel line pressure is okay, go to step  13.
  11. Inspect Fuel Line From Fuel Pump To Fuel Delivery Pipe -  Visually inspect fuel line for any leakage. If any fuel leakage is present, replace suspected fuel line. After repair, go to next step. If fuel leakage is not present, inspect low-pressure side fuel filter for foreign material or stain inside fuel filter. If foreign material or stain is found inside fuel filter (low-pressure side), clean of fuel tank and filter. If low-pressure side fuel filter is okay, replace fuel pump unit. After repair, go to step  13.
    12. 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: If there are any small bubbles which make engine coolant white at filler opening, air is getting in from poor sealing to head gasket or other areas between combustion chamber and engine coolant passage. Large bubbles are normal since they are remaining air coming out from engine coolant passage.
  12. Inspect Sealing Of Engine Coolant Passage -  Remove radiator cap. Perform procedure to bleed air from engine coolant, then run engine at idle. If there are any small bubbles which make engine coolant white at filler opening, repair or replace faulty parts. After repair, go to next step. If small bubbles are not present, go to next step.
  13. Verify Trouble Shooting Of DTC P0133 Is Completed -  Make sure to reconnect all disconnected connectors. Turn ignition on, engine off. Clear DTC from memory using WDS or equivalent. Perform MODE 1 - PCM ADAPTIVE MEMORY PRODUCE DRIVE MODE  and MODE 3 - HO2S HEATER, HO2S & TWC REPAIR VERIFICATION DRIVE MODE  under DRIVE CYCLES. Stop vehicle and access ON BOARD SYSTEM READINESS TEST to inspect DRIVE MODE completion status. Verify O2S_EVAL PID to Yes. If not, run DRIVE MODE again. Access following item (TEST #) values.
    • TEST #10:01:05 (Front HO2S rich-to-lean response time)
    • TEST #10:01:06 (Front HO2S lean-to-rich response time)
    • TEST #10:01:0A (Front HO2S inversion cycles)
    If all test values are less than maximum value, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION article. After repair, go to next step. If all test values more than maximum value, go to next step.
  14. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If any DTCs are present, go to appropriate DTC inspection. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, trouble shooting is complete.
scientia non olet · About LEMON Manuals