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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Engine Controls [Self-Diagnostics 3.0L]) >> Diagnostic Tests >> DTC P0131, DTC P0132, DTC P0151 Or DTC P0152 >> 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. Verify Related Pending & Stored DTCs -  Turn ignition off, then on (engine off). Verify pending and stored DTCs using WDS or equivalent. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If no other DTC is present, go to next step. If other DTC is present, go to appropriate DTC troubleshooting procedure for that DTC. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  4. Identify Trigger DTC For FREEZE FRAME DATA -  If DTC P0131, P0132, P0151 and P0152 are 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 for P0131 and P0132 or O2S21 for P0151 and P0152 PID using WDS or equivalent. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Verify PID while racing engine in Park (ATX) or Neutral (MTX).
    • Rich Condition -  More than 0.45 volt when suddenly depressing accelerator pedal
    • Lean Condition -  Less than 0.45 volt just after release of accelerator pedal
    If PID reading is okay, go to next step. If PID reading is not okay, replace HO2S. After repair, go to step  20.
  6. Inspect Long Term Fuel Trim -  Access following PIDs:
    • LONGFT1 for P0131 and P0132
    • LONGFT2 for P0151 and P0152
    Compare PID values with FREEZE FRAME DATA values recorded in step  1. If PID value is less than FREEZE FRAME DATA value, vehicle is driven under rich condition. Go to next step. If PID value is more than FREEZE FRAME DATA value, vehicle 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 malfunction is not present, inspect following parts and repair or replace if necessary:
    • Fuel pump maximum pressure
    • Fuel return pipe for clogged
    If all items are okay, replace pressure regulator. After repair, go to step  20. If malfunction is present, go to step next step.
  8. Inspect Whether Purge Solenoid Valve Is Stuck Open -  Turn ignition OFF. Disconnect both hoses from purge solenoid valve. Blow air through purge solenoid valve. If air blows through purge solenoid valve, replace purge solenoid valve. If air does not flow 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  20.
  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 low, go to next step. If fuel line pressure is okay, go to step  20.
  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  20.
  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  20. 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  20.
  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  17.
  14. Check Ignition Coils Of No Blinking Cylinder -  Turn ignition off. Inspect ignition coils for installation condition, corrosion on terminal, open lead and damaged cover. If condition of ignition coils are okay, go to next step. If ignition coils are faulty, replace faulty coil(s). After repair, go to step  20.
  15. Inspect Power Supply Terminal At Ignition Coil Connector -  Disconnect ignition coil 2-pin harness connector. Turn ignition on, engine off. Measure voltage between ignition coil harness connector power supply terminal "A" and body ground. If battery voltage is present, go to next step. If voltage reading is not battery voltage, check for open circuit between ignition coil harness connector power supply terminal "A" and ignition switch. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Repair or replace wiring harness. After repair, go to step  20.
  16. Inspect Ignition Coil -  Inspect ignition coil. Refer to IGNITION COILS under IGNITION SYSTEMS in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If all ignition coils are okay, go to next step. If any ignition coil is faulty, replace faulty ignition coil. After repair, go to step  20.
  17. 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.
  18. Inspect Fuel Injector -  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  20.
    19. 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 at 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.
  19. 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.
  20. Verify Trouble Shooting Of DTCs P0131, P0132, P0151 Or P0152 Is Completed -  Make sure to reconnect all disconnected connectors. Turn ignition on, engine off. Clear DTC from memory using WDS or equivalent. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. 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.
  21. 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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