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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, go to next step.

  2. Check MAP PID

    Obtain local barometric pressure reading. Access MAP PID. If MAP PID is not available, disconnect PCM connector and install breakout box. With KOEO, measure voltage at breakout box terminal No. 63 (MAP circuit). If MAP PID is available, with KOEO compare PID voltage with MAP SENSOR VOLTAGE SPECIFICATIONS  table. If PID voltage matches voltage in table, go to next step. If PID voltage does not match voltage in table, for DTC P0108, go to step  6 . For DTC P0107 and P0109, go to step  5 .
    MAP SENSOR VOLTAGE SPECIFICATIONS

    Barometric Pressure In. Hg (kPa) Volts
    3.0 (10.0) 0.5
    6.8 (23.1) 1.0
    10.7 (36.1) 1.5
    18.5 (62.3) 2.5
    20.4 (68.8) 2.6
    22.3 (75.4) 3.0
    26.2 (88.4) 3.5
    27.2 (91.7) 3.6
    28.1 (95.0) 3.75
    29.1 (98.2) 3.8
    30.1 (101.5) 4.12
    31.1 (104.8) 4.12
    32.0 (108) 4.25

  3. Check MAP Transition With Vacuum

    Remove MAP sensor from intake manifold. Ensure MAP sensor electrical connector is connected. Access MAP PID. If MAP PID is not available, measure at breakout box terminal No. 63 (MAP circuit). Slowly apply 18 in. Hg of vacuum to sensor and watch voltage for smooth transition down as vacuum is applied. If voltage value decreases smoothly with vacuum application, go to next step. If voltage value does not decrease smoothly with vacuum application, replace faulty MAP sensor. Go to step  11 .

  4. Check MAP Output With Vacuum

    Subtract applied vacuum from local barometric pressure reading. See MAP SENSOR VOLTAGE SPECIFICATIONS  table and compare with voltage specification in table. If voltage value compares with value in MAP SENSOR VOLTAGE SPECIFICATIONS table, failure is intermittent. See INTERMITTENT  under SYSTEM TESTS. If voltage value does not compare with value in MAP SENSOR VOLTAGE SPECIFICATIONS table, replace faulty MAP sensor. Go to step  11 .

  5. Check VREF Voltage To MAP Sensor

    Disconnect MAP sensor electrical connector. Measure voltage between VREF (Brown/White wire) and SIG RTN (Gray/Yellow wire) circuits at MAP sensor harness connector. See Fig 1 . If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to VEHICLE REFERENCE VOLTAGE  under SYSTEM TESTS.
    Fig 1: Identifying MAP Sensor Circuits (2.3L)
    G00155529Courtesy of MAZDA MOTORS CORP.

  6. Check MAP Circuit For Short To Power

    Measure voltage at MAP sensor harness connector between MAP circuit (Light Green/Black wire) and battery negative terminal. See Fig 1 . If voltage is more than 10.5 volts, a short to VPWR is indicated. Go to step  8 . If voltage is 10.5 volts or less, go to next step.

  7. Check MAP Signal Circuit

    Turn ignition off. Jumper VREF circuit (Brown/White wire) and MAP circuit (Light Green/Black wire) at MAP sensor harness connector. See Fig 1 . With KOEO, measure voltage at breakout box terminal No. 63 (MAP circuit) and terminal No. 90 (PWR GND circuit). If voltage is the same as VREF voltage, replace faulty MAP sensor. Go to step  11 . If voltage is not the same as VREF voltage, go to step  10 .

  8. Isolate MAP Circuit For Short To VPWR

    Turn ignition off. Disconnect PCM connector. Install breakout box and leave PCM disconnected. With KOEO, measure voltage between terminal No. 63 (MAP circuit) and terminal No. 103 (PWR GND circuit). If voltage is more than 10.5 volts, repair short circuit between MAP circuit and VPWR. See WIRING DIAGRAMS article. Go to step  11 . If voltage is 10.5 volts or less, MAP is shorted to VPWR inside PCM. Replace faulty PCM. Go to step  11 .

  9. Check For Shorted MAP Circuit In Harness

    Turn ignition off. Disconnect scan tool from DLC. Measure resistance between MAP circuit (Light Green/Black wire) and SIG RTN circuit (Gray/Red wire) at MAP sensor harness connector. See Fig 1 . Record reading. Measure resistance between MAP circuit (Light Green/Black wire) and chassis ground. Record reading. If either resistance measurement is more than 10,000 ohms, MAP circuit is shorted to SIG RTN or ground inside PCM. Replace faulty PCM. Go to step  11 . If either resistance measurement is 10,000 ohms or less, repair short circuit in harness. See WIRING DIAGRAMS article. Go to step  11 .

  10. Check MAP & SIG RTN Circuits For Open

    Turn ignition off. Disconnect PCM connector. Connect breakout box and leave PCM disconnected. Check continuity of MAP circuit (Light Green/Black wire) between MAP harness connector and breakout box terminal No. 63. See Fig 1 . Check continuity of SIG RTN circuit (Gray/Red wire) between MAP harness connector and breakout box terminal No. 91. If continuity is present at either circuit, MAP or SIG RTN circuit is open inside PCM. Replace faulty PCM. Go to next step. If continuity is not present at either circuit, repair open circuit in harness. See WIRING DIAGRAMS article. Go to next step.

  11. 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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