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Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Mazda B4000, 2002 Mazda B3000, and 2002 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:
    • For KOER DTC P1101, go to step  2 .
    • For KOEO DTC P1101, go to step  4 .
    • For Continuous Memory DTC P1100, go to step  14 .
    • For DTC P0102, go to step  3 .
    • For DTC P0103, go to step  16 .

  2. DTC P1101: Check For MAF Sensor Continuous Memory DTCs

    Using scan tool, clear DTCs. Drive vehicle 6-10 minutes. Retrieve Continuous Memory DTCs. If a Continuous Memory DTC is not present with KOER DTC P1101, go to step  4 . If a Continuous Memory DTC is present with KOER DTC P1101, perform the following:

  3. DTC P0102: Check MAF Sensor Signal Low Input To PCM

    Inspect air intake system ducting for broken or loose clamps and cracks or holes or other damage to components. Repair as necessary. Start engine and idle. If KOER DTC P0505 is set, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  . On A/T vehicles, if engine stalls and cannot maintain idle, go to step  8 . On all other applications, increase engine speed to 1500 RPM for 5 seconds, then bring back to idle. Access MAF V PID. If voltage is less than 0.23 volt, go to step  5 . If voltage is 0.23 volt or more, go to next step.

  4. DTC P1101: Check For MAF Sensor Signal Out Of Self-Test Range

    Turn ignition off. DTC P1101 may be generated by a low charged vehicle battery or a garage exhaust ventilation system. Repair vehicle battery as necessary. Remove garage exhaust ventilation system and vent vehicle exhaust to outside. Rerun KOEO self-test. Verify MAF sensor is connected. Turn ignition on. With KOER, access MAF V PID. If voltage is 0.46-2.44 volts, fault is not present at this time. See INTERMITTENT  under SYSTEM TESTS. If voltage is not 0.46-2.44 volts, go to next step.

  5. Check VPWR Voltage to MAF Sensor

    Turn ignition off. Disconnect MAF sensor. With KOEO, check voltage between VPWR circuit (Red wire) at MAF sensor harness connector and battery negative terminal. See Fig 1 . If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open circuit. See WIRING DIAGRAMS article. Go to step  19 .
    Fig 1: Identifying MAF/IAT Sensor Circuits
    G00155528Courtesy of MAZDA MOTORS CORP.

  6. Check Power Ground Circuit Between MAF Sensor & Power Relay

    Measure voltage between PWR GND circuit (Black wire) at MAF sensor harness connector and battery positive terminal. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open circuit. See WIRING DIAGRAMS article. Go to step  19 .

  7. Check VPWR Circuit For Open In Harness

    Turn ignition off. Disconnect PCM connector. Install breakout box with PCM disconnected. Measure resistance of VPWR circuit (Red wire) between PCM pin No. 71 and MAF sensor harness connector. See Fig 1 . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit. See WIRING DIAGRAMS article. Go to step  19 .

  8. Check MAF Circuit Short To PWR GND Or MAF RTN In Harness

    Disconnect scan tool from DLC. Measure resistance between MAF circuit (Light Blue/Red wire) and PWR GND circuit (Black wire). See Fig 1 . Record reading. Measure resistance between MAF circuit (Light Blue/Red wire) and MAF RTN circuit (Tan/Light Blue wire). Record reading. If either resistance value is more than 10,000 ohms, go to next step. If either resistance value is 10,000 ohms or less, repair appropriate circuit for short circuit. See WIRING DIAGRAMS article. Go to step  19 .

  9. Check MAF RTN Circuit Short To PWR GND In Harness

    Measure resistance between MAF RTN circuit (Tan/Light Blue wire) and PWR GND circuit (Black wire) at MAF sensor harness connector. See Fig 1 . If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short circuit. See WIRING DIAGRAMS article. Go to step  19 .

  10. Check MAF Circuit Voltage Cycling Integrity

    Reconnect PCM connector and scan tool to DLC. With KOEO, access MAF V PID and record reading. Jumper MAF RTN and PWR GND at MAF sensor harness connector. See Fig 1 . Observe MAF V PID. If voltage changed from less than 0.23 volt (closer to zero volts) to more than 4.5 volts, replace faulty MAF sensor. Go to step  19 . If voltage did not change as specified, for DTC P0102, go to next step. For DTC P1101 without P0102 set, go to step  12 .

  11. Check MAF Circuit For Open In Harness

    Turn ignition off. Disconnect PCM connector. Install breakout box with PCM disconnected. Measure resistance of MAF circuit (Light Blue/Red wire) between breakout box terminal No. 88 and MAF sensor harness connector. See Fig 1 . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit. See WIRING DIAGRAMS article. Go to step  19 .

  12. Check PWR GND Circuit For Open In Harness

    Turn ignition off. Disconnect scan tool from DLC. Measure resistance of PWR GND circuit (Black wire) between MAF sensor harness connector and battery negative terminal. See Fig 1 . If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or more, repair open circuit. See WIRING DIAGRAMS article. Go to step  19 .

  13. Check MAF RTN For Open In Harness

    Measure resistance of MAF RTN circuit (Tan/Light Blue wire) between breakout box terminal No. 36 and MAF sensor harness connector. See Fig 1 . If resistance is less than 5 ohms, replace faulty PCM. Go to step  19 . If resistance is 5 ohms or more, repair open circuit. See WIRING DIAGRAMS article. Go to step  19 .

  14. DTC P1100: Check MAF Circuit For Intermittent Voltage To PCM

    Start engine. If stable idle is not at least 700 RPM, go to TROUBLE SHOOTING - NO CODES article. If idle is okay, run engine up to 1500 RPM for 5 seconds, then return to idle. Access MAF V PID and observe while lightly tapping on MAF sensor and wiggling wiring harness to simulate road shock. If voltage goes to less than 0.23 volt (minimum) or more than 4.6 volts (maximum), inspect MAF sensor connector. If sensor connector is okay, replace faulty MAF sensor. Go to step  19 . If voltage does not exceed minimum or maximum specifications, go to next step.

  15. Check For MAF Sensor Circuit For Intermittent Opens Or Shorts

    Access MAF V PID and observe. With KOEO, grasp MAF sensor harness and harness connector and shake and bend harness back to dash panel. Shake and bend harness from dash panel to PCM. If voltage goes to less than 0.23 volt (minimum) or more than 4.6 volts (maximum), repair harness as necessary. See WIRING DIAGRAMS article. Go to step  19 . If voltage does not exceed minimum or maximum specifications, fault is not present at this time. See INTERMITTENT  under SYSTEM TESTS.

  16. DTC P0103: Check MAF Sensor Signal High Input To PCM

    This DTC may be caused by an airflow restriction at MAF sensor screen. Before continuing with procedure, inspect MAF sensor screen and clean if necessary. If screen was blocked with material, recheck for DTCs after cleaning screen. If screen is okay, start engine and idle. If KOER DTC P0505 is set, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If KOER DTC P0505 is not set, increase engine speed to 1500 RPM for 5 seconds, then return to idle. MAF V PID should be more than 4.6 volts. Access MAF V PID and record voltage. Turn ignition off. Disconnect MAF sensor connector. Jumper PWR GND (Black wire) and MAF RTN (Tan/Light Blue wire) circuits at MAF sensor harness connector. See Fig 1 . Observe voltage with KOER. If voltage is less than the previous voltage of 0.23 volt, turn ignition off. Remove jumper. Replace faulty MAF sensor. Go to step  19 . If voltage is not less than the previous voltage of 0.23 volt, turn ignition off. Remove jumper. Go to next step.

  17. Check MAF Circuit For Short To VPWR In Harness

    Disconnect PCM connector. Install breakout box with PCM disconnected. With KOEO, measure voltage between breakout box terminal No. 88 (MAF circuit) and terminals No. 51, 77 and 103 (PWR GND circuit). See Fig 1 . If voltage is less than one volt, go to next step. If voltage is one volt or more, repair short circuit. See WIRING DIAGRAMS article. Go to step  19 .

  18. Check MAF Circuit For Short To VREF In Harness

    Turn ignition off. Measure resistance between breakout box terminal No. 88 (MAF circuit) and terminal No. 90 (VREF circuit). If resistance is more than 10,000 ohms, if an idle concern is not present, replace faulty PCM.If an idle concern is still present, disregard DTC P0103 at this time. Go to next step. If resistance is 10,000 ohms or less, repair short circuit. See WIRING DIAGRAMS article. Go to next step.

  19. Verify Trouble Shooting Of DTCs Completed

    Make sure all electrical connectors are reconnected. Clear DTCs from PCM memory using scan tool. Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If the same DTC is present, replace faulty PCM. Repeat QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no DTCs are present, test is complete.
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