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Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Mazda B4000, 2003 Mazda B3000, and 2003 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
  1. If QUICK TEST was not performed, go to QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If QUICK TEST was performed, go to next step.
  2. Verify Related Pending & Stored DTCs -  If any other DTCs are present during QUICK TEST, go to appropriate diagnostic procedure. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no other DTCs are present during QUICK TEST, go to next step.
  3. Identify Trigger DTC For Freeze Frame Data -  If DTC P1130 or P1150 are on Freeze Frame Data, go to next step. If DTC P1130 or P1150 are not on Freeze Frame Data, go to trouble shooting procedure for DTC that triggered Freeze Frame Data.
    4. NOTE: It is necessary to address all Continuous Memory ignition and misfire DTCs if they were received during Continuous Memory testing before addressing any KOER HO2S DTCs.
  4. DTCs P1130 & P1150: Fuel System Not Switching At Fuel Trim (Rich Or Lean) -  Check air cleaner housing and filter for blockage. Check air intake system for leaks and damage. Check PCV system. Check vacuum leaks. If any problems are found, repair as necessary. After repair, go to step  16 . If any problems are not found, go to next step.
  5. Check HO2S Ability To Generate A Voltage More Than 0.5 Volt -  Inspect HO2S harness for chafing, burned wiring or other damage. Repair as necessary. Disconnect suspect HO2S 4-pin harness connector. Connect DVOM to HO2S signal circuit and HO2S SIG RTN or HO2S GND at HO2S 4-pin connector (component side). See Fig 1 . Run engine at 2000 RPM for 3 minutes. Run KOER Self-Test and monitor HO2S voltage. Turn ignition off. If voltage reading is more than 0.5 volt during or at end of Self-Test, go to next step. If voltage reading is not more than 0.5 volt during or at end of Self-Test, replace faulty HO2S. After repair, go to step  16 .
    Fig 1: HO2S Harness Connector Circuit Identification
    G95E35968Courtesy of MAZDA MOTORS CORP.
  6. Monitor HO2S PID For Proper Switching -  With KOER and engine at operating temperature, using scan tool, select DIAGNOSTIC DATA LINK. Select PCM. Select PID/DATA MONITOR AND RECORD. Access O2S11 (Front Right) or O2S21 (Front Left) PID and monitor while wiggling, bending and shaking small sections of wiring harness between HO2S 4-pin harness connector and PCM 104-pin harness connector. Turn ignition off. If HO2S voltage reading stayed high (more than 0.45 volt) or low (less than 0.45 volt), isolate cause and lack of HO2S switching. Repair as necessary. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  16 . If HO2S voltage reading did not stay high (more than 0.45 volt) or low (less than 0.45 volt), go to next step.
    WARNING: Fuel system retains fuel pressure with engine not running. Use caution when working on fuel system.
  7. Check Fuel Pressure -  Install fuel pressure gauge. With KOEO, using scan tool, select DIAGNOSTIC DATA LINK. Select PCM. Select ACTIVE COMMAND MODES. Access OUTPUT TEST MODE and run fuel pump to obtain maximum fuel pressure. Fuel pump will run for about 8 seconds when OUTPUT TEST MODE is activated. See FUEL PRESSURE SPECIFICATIONS  table. If fuel pressure is within specification, fuel system is okay. Go to next step. If fuel pressure is not within specification, see FUEL DELIVERY SYSTEM  testing under SYSTEM TESTS.
    FUEL PRESSURE SPECIFICATIONS

    Engine psi (kPa)
    2.3L 35-55 (240-380)
    3.0L & 4.0L 30-65 (207-448)
  8. Check Injector Fault PIDs -  Using scan tool, access INJ1F-INJ6F PIDs. If an injector fault is present, go to next step. If an injector fault is not present, go to step  12 .
    9. NOTE: Next test step erases Continuous Memory DTCs.
    Fig 2: Fuel Injector Harness Connector Circuit Identification
    G00155536Courtesy of MAZDA MOTORS CORP.
  9. Check Fuel Injector(s) & Harness Resistance -  Turn ignition off. Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure . Use injector fault PID to determine which fuel injector(s) to test. Measure resistance of suspect fuel injector between INJ circuit and breakout box terminal No. 71 (VPWR circuit). See Fig 2 . See FUEL INJECTOR RESISTANCE SPECIFICATIONS  table. If resistance reading is within specification, replace faulty PCM. After repair, go to step  16 . If resistance reading is not within specification, go to next step.
    FUEL INJECTOR RESISTANCE SPECIFICATIONS

    Engine Ohms
    2.3L 11-13
    3.0L 8.5-15.5
    4.0L 11-18
  10. Check Fuel Injector Harness Resistance -  Disconnect fuel injector harness 2-pin harness connector at suspect fuel injector. Measure resistance of VPWR circuit between breakout box terminal No. 71 and fuel injector harness connector. See Fig 2 . Record reading. Measure resistance of INJ circuit between appropriate breakout box terminal and fuel injector harness connector. Record reading. If each resistance reading is less than 5 ohms, go to next step. If either resistance reading is 5 ohms or more, repair open wiring harness. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  16 .
  11. Check Fuel Injector Harness Circuit For Short To Power & Ground -  Measure resistance between suspect fuel injector circuit breakout box terminal and breakout box terminal No. 71 (VPWR). Record reading. Measure resistance between suspect fuel injector circuit breakout box terminal and breakout box terminal No. 103 (PWR GND). Record reading. If each resistance reading is more than 10,000 ohms, go to next step. If either resistance reading is 10,000 ohms or less, repair short circuit in suspect wire. After repair, go to step  16 .
  12. Flow Test Fuel Injector(s) -  Using a fuel injector tester, flow test fuel injectors following equipment manufacturers instructions. See FUEL INJECTOR FLOW RATE SPECIFICATIONS  table. If flow rate values are within specification, go to next step. If flow rate values are not within specification, replace faulty fuel injector(s). After repair, go to step  16 .
    FUEL INJECTOR FLOW RATE SPECIFICATIONS

    Engine Lbs. Hr. (kg/hr)
    2.3L 21 (9.6)
    3.0L 12 (5.5)
    4.0L 19 (8.7)
  13. Inspect Induction System For Air Leaks -  Inspect following areas for signs of air leaks:
    • Inlet tube(s) from air cleaner to throttle body assembly.
    • Gaskets between upper and lower intake manifold assemblies.
    • Vacuum hoses and lines for cracks and proper connections.
    • PCV system integrity.

    If any leak is found, repair as necessary. After repair, go to step  16 . If no leak is found, go to next step.

  14. Check Cylinder Compression -  Check cylinder compression. See MECHANICAL INSPECTION under PRELIMINARY INSPECTION & ADJUSTMENTS in BASIC DIAGNOSTIC PROCEDURES article. If cylinder compression is within specification, go to next step. If cylinder compression is not within specification, repair as necessary. After repair, go to step  16 .
    15. NOTE: Next test step requires a helper to monitor PID.
  15. Test Drive While Monitoring HO2S PID For Proper Switching -  Using scan tool, select DIAGNOSTIC DATA LINK. Select PCM. Select PID/DATA MONITOR AND RECORD. Access O2S11 (Front Right) or O2S21 (Front Left) PID. While observer monitors PID, test drive vehicle under different road conditions in an attempt to simulate original fault. If HO2S appears to switch properly, unable to duplicate fault at this time. Go to next step. If HO2S does not appear to switch properly, replace faulty HO2S. After repair, go to next step.
  16. Drive Cycle -  Reconnect all electrical connectors. Using scan tool, clear DTCs from PCM memory. Perform EVAP RUNNING LOSS SYSTEM REPAIR VERIFICATION DRIVE CYCLE  in MONITOR REPAIR VERIFICATION DRIVE CYCLES under DRIVE CYCLE PROCEDURES. Using scan tool, retrieve DTCs. If same DTC is not present, go to next step. If same DTC is present, replace faulty PCM. After repair, go to next step.
  17. Verify Repair -  Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If any DTC is present, go to applicable procedure for other DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no DTC is present, trouble shooting is complete.
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