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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 60 (Engine Controls [Self-Diagnostics 2.3L]) >> Diagnostic Tests >> DTC P0131 Or P0132 >> 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 P0131 and P0132 are present on FREEZE FRAME DATA, go to next step. If DTC P0131 and P0132 are not present on FREEZE FRAME DATA, go to trouble shooting procedures for DTC that triggered FREEZE FRAME DATA. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  5. Verify Current Input Signal Status - Is Concern Intermittent Or Constant -  Warm-up engine. Access O2S11 for P0131 and P0132 PID using WDS or equivalent. Verify PID value while racing engine (in PARK - ATX) or NEUTRAL - MTX).
    • More than 0.45 volt  when suddenly depressing accelerator pedal (rich condition)
    • Less than 0.45 volt  just after release of accelerator pedal (lean condition)
    If PID reading is okay, go to next step. If PID readings are not okay, replace front HO2S. After repair, go to step  19.
  6. Inspect Long Term Fuel Trim -  Access LONGFT1 for P0131 and P0132 PID using WDS or equivalent. Compare it with FREEZE FRAME DATA recorded at step 1. If PID value decreased, engine is driven under rich condition. Go to next step. If PID value did not decrease, engine is driven under lean condition. Go to step  9.
  7. Inspect Fuel Line Pressure (Excessive Fuel Line Pressure) -  Turn ignition off. Inspect fuel line pressure. 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 incorrect, inspect following parts and repair or replace if necessary:
    • Fuel pump maximum pressure
    • Fuel return pipe for being clogged
    If all components are okay, replace fuel pressure regulator. After repair, go to step  19.
  8. Inspect Purge Solenoid Valve For Being Stuck Open -  Turn ignition off. Disconnect both hoses from purge solenoid valve. Blow air through purge solenoid valve. If air blows through, replace purge solenoid valve. After repair, go to step  19. If air does not blow through purge solenoid valve, go to step  13.
  9. Inspect PCV Valve Operation -  Inspect PCV valve operation. Refer to POSITIVE CRANKCASE VENTILATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If PCV valve is okay, go to next step. If PCV valve is faulty, replace PCV valve. After repair, go to step  19.
  10. Inspect Fuel Line Pressure (Low Fuel Line Pressure) -  Turn ignition off. Inspect fuel line pressure. Refer to FUEL PRESSURE (EXCEPT B2300, B3000, B4000 & TRIBUTE) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article. If fuel line pressure is incorrect, go to next step. If fuel pressure is okay, go to step  13.
  11. Inspect Fuel Pump Maximum Pressure -  Stop engine. Turn ignition on, engine off. Perform fuel pump maximum pressure test. Refer to FUEL PRESSURE (EXCEPT B2300, B3000, B4000 & TRIBUTE under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article. If fuel pump maximum pressure is okay, go to next step. If fuel pump maximum pressure is incorrect, inspect fuel pump circuit for open or poor connection. Repair or replace suspected circuit. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If circuit is okay, replace fuel pump. After repair, go to step  19.
  12. Inspect Fuel Line From Fuel Pump To Fuel Delivery Pump -  Visually inspect fuel line for any leakage. If any fuel leakage is found, replace suspected fuel line. After repair, go to step  19. If no fuel leakage is found, inspect fuel filters for following:
    • Restriction or clogging at fuel filter (high-pressure side)
    • Foreign materials or stain inside fuel filter (low-pressure side)
    If restriction or clogging is found at fuel filter (high-pressure side), replace fuel filter. If foreign materials or stain is found inside fuel filter (low-pressure side), clean fuel tank and filter. If all items are okay, replace pressure regulator. After repair, go to step  19.
  13. Check Ignition Coil Operation -  Using spark tester, perform spark test. Refer to IGNITION CHECKS in BASIC DIAGNOSTIC PROCEDURES article. If all cylinders do not show blinking condition, go to next step. If all cylinders show blinking condition, go to step  16.
  14. Inspect Power Supply Terminal At Ignition Coil Connector -  Disconnect ignition coil 3-pin harness connector. Turn ignition on, engine off. Measure voltage between ignition coil 3-pin harness connector terminal "B" (Black/White wire) and body ground. See Fig 1. If voltage reading is battery voltage, go to next step. If voltage reading is not battery voltage, check for open circuit between ignition coil 3-pin harness connector terminal "B" (Black/White wire) and ignition switch (Blue wire). See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Repair or replace wiring harness. After repair, go to step  19.
    Fig 1: Identifying Ignition Coil 3-Pin Connector & Terminals (MAZDA6 2.3L)
    G00158954Courtesy of MAZDA MOTORS CORP.
  15. Inspect Ignition Coil Resistance -  Check ignition coil resistance. Refer to COIL PACKS under IGNITION SYSTEM in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If ignition coil resistance reading is okay, go to next step. If ignition coil resistance reading is not okay, replace ignition coil. After repair, go to step  19.
  16. Inspect Engine Compression -  Inspect engine compression. Refer to MECHANICAL INSPECTION in BASIC DIAGNOSTIC PROCEDURES article. If engine compression is okay, go to next step. If engine compression is not okay, perform engine overhaul for repairs. After repair, go to next step.
  17. Inspect Fuel Injector Operation -  Turn ignition off. Inspect fuel injectors. Refer to FUEL CONTROL under FUEL SYSTEM in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If all fuel injectors are okay, go to next step. If any fuel injectors are not okay, replace faulty fuel injector. After repair, go to step  19.
    18. 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 cap 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.
  18. 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, then go to next step. If small bubbles are not present, go to next step.
  19. Verify Trouble Shooting Of DTC P0131 Or P0132 Is Completed -  Make sure to reconnect all disconnected connectors. Turn ignition on, engine off. Clear DTC from memory using WDS or equivalent. Start engine. Access ECT and RPM PIDs using WDS or equivalent. Make sure that ECT PID is more than 176°F (80°C). Increase and keep engine speed at more than 1500 RPM for at least one minute. If PENDING CODE of same DTC is not present, go to next step. If PENDING CODE of same DTC is present, 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.
  20. 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.
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