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Home >> Mazda >> 2018 >> MX-5 Miata Club, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> System >> Symptom Troubleshooting - Engine Control >> Engine Control System Operation Inspection >> Related PIDs
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Related PIDs

Item (definition) Unit/Condition Definition Condition/Specification (Reference)
VT_IN_ACT °(deg) Actual intake variable valve timing control
  • Advance amount from max retard position
  • Displays actual intake variable valve timing-advance amount from max retard position

    Ignition switched ON (engine off)

    • Approx. 28 ° (ECT is 89 °C {192 °F}) Idle (after warm up)
    • Approx. 24.75 ° (ECT is 91 °C {196 °F}) Racing (engine speed is 2, 000 RPM)
    • Approx. 18.62 ° (ECT is 89 °C {192 °F}) Racing (engine speed is 4, 000 RPM)
    • Approx. 0.18 ° (ECT is 88 °C {190 °F})
VT_IN_DES °(deg) Target intake variable valve timing control
  • Advance amount from max retard position
  • Displays target intake variable valve timing-advance amount from max retard position Ignition switched ON (engine off)
    • Approx. 27.81 ° (ECT is 89 °C {192 °F}) Idle (after warm up)
    • Approx. 24.56 ° (ECT is 91 °C {196 °F}) Racing (engine speed is 2, 000 RPM)
    • Approx. 18.62 ° (ECT is 89 °C {192 °F}) Racing (engine speed is 4, 000 RPM)
    • Approx. 0 ° (ECT is 88 °C {190 °F})


Item (definition) Unit/Condition Definition Condition/Specification (Reference)
OIL_P_SOL Off/On Engine oil solenoid valve operation status
  • ECT below 98 °C {208 °F} and engine speed below 4, 000 RPM: On
  • ECT above 98 °C {208 °F} or engine speed above 4, 000 RPM: Off
RPM RPM Engine speed
  • Displays engine speed
ECT °C, °F Engine coolant temperature input from ECT sensor No. 1
  • Displays ECT
V ECT sensor No. 1 voltage Ignition switched ON (engine off)
  • ECT is 92 °C {198 °F}: Approx. 0.65 V Idle (after warm up)
  • ECT is 93 °C {199 °F}: Approx. 0.64 V Racing (Engine speed is 2, 000 RPM)
  • ECT is 92 °C {198 °F}: Approx. 0.66 V Racing (Engine speed is 4, 000 RPM)
  • ECT is 93 °C {199 °F}: Approx. 0.64 V


Item (definition) Unit/Condition Definition Condition/Specification (Reference)
ECT °C, °F Engine coolant temperature input from ECT sensor No. 1
  • Displays ECT
V ECT sensor No. 1 voltage Ignition switched ON (engine off)
  • ECT is 92 °C {198 °F}: Approx. 0.65 V Idle (after warm up)
  • ECT is 93 °C {199 °F}: Approx. 0.64 V Racing (Engine speed is 2, 000 RPM)
  • ECT is 92 °C {198 °F}: Approx. 0.66 V Racing (Engine speed is 4, 000 RPM)
  • ECT is 93 °C {199 °F}: Approx. 0.64 V
IAT °C, °F Intake air temperature (No. 1) input from IAT sensor No. 1
  • Displays IAT (No. 1)
V IAT sensor No. 1 voltage
  • IAT is 60 °C {140 °F}: Approx. 1.13 V
  • IAT is 63 °C {145 °F}: Approx. 1.07 V
  • IAT is 65 °C {149 °F}: Approx. 1.01 V
RPM RPM Engine speed
  • Displays engine speed


Item (definition) Unit/Condition Definition Condition/Specification (Reference)
RPM RPM Engine speed
  • Displays engine speed


Item (definition) Unit/Condition Definition Condition/Specification (Reference)
ETC_ACT °(deg) Actual throttle valve opening angle Ignition switched ON (engine off)
  • Accelerator pedal released: Approx. 12.94 °
  • Accelerator pedal fully depressed: Approx. 86.18 ° Idle (after warm up)
  • Accelerator pedal released: Approx. 2.22 °
ETC_DSD °(deg) Target throttle valve opening angle
  • Displays target TP opening angle Ignition switched ON (engine off)
    • Accelerator pedal released: Approx. 12.9 °
    • Accelerator pedal fully depressed: Approx. 86 °
% Target throttle valve opening angle (percent)
  • Displays target TP opening angle(percent)

Ignition switched ON (engine off)

  • Accelerator pedal released: Approx. 14.9%
  • Accelerator pedal fully depressed: Approx. 100 %


Item (definition) Unit/Condition Definition Condition/Specification (Reference)
FUELPW Sec Fuel injection pulse width (fuel injector energization time) output to fuel injector
  • Idle (after warm up): Approx. 1.8 ms (ECT is 92 °C {198 °F})
  • Racing (engine speed is 2, 000 RPM): Approx. 1.36 ms (ECT is 86 °C {187 °F})
  • Racing (engine speed is 4, 000 RPM): Approx. 0.87 ms (ECT is 84 °C {183 °F})
RPM RPM Engine speed
  • Displays engine speed

If data monitor function of M-MDS is not used:

  1. Warm up the engine and idle it.
  2. Measure the fuel injector control signal wave profile using the oscilloscope while performing the following steps:
    1. Depress the accelerator pedal and increase the engine speed to 4, 000 RPM.
    2. Quickly release the accelerator pedal (brake pedal is not depressed) and verify that the wave profile constant B+, and the wave appears when the engine speed drops below 1, 200 RPM. (See PCM INSPECTION ).


Item (definition) Unit/Condition Definition Condition/Specification (Reference)
APP1 % Accelerator pedal opening angle (absolute value) input from APP sensor No. 1
  • Accelerator pedal released: Approx. 15.29%
  • Accelerator pedal fully depressed: Approx. 90.98%
V APP sensor No. 1 voltage
  • Accelerator pedal released: Approx. 0.77 V
  • Accelerator pedal fully depressed: Approx. 4.55 V
APP2 % Accelerator pedal opening angle (absolute value) input from APP sensor No. 2
  • Accelerator pedal released: Approx. 7.84%
  • Accelerator pedal fully depressed: Approx. 45.49%
  V APP sensor No. 2 voltage
  • Accelerator pedal released: Approx. 0.38 V
  • Accelerator pedal fully depressed: Approx. 2.27 V
EVAPCP % Purge solenoid valve control duty value
  • Idle (after warm up): Approx. 0% (ECT is 94 °C {201 °F})
  • Racing (Engine speed 2, 000 RPM): 0% (ECT is 94 °C {201 °F})
  • Racing (Engine speed 4, 000 RPM): Approx. 10.1% (ECT is 94 °C {201 °F})
MAF g/Sec Mass air flow input from MAF sensor
  • Displays MAF
V MAF sensor voltage
  • Ignition switched ON (engine off) (MAF: 0.39 g/s {0.052 lb/min}): Approx. 0.72 V (ECT is 89 °C {192 °F})
  • Idle (after warm up) (MAF: 4.29 g/s {0.567 lb/min}): Approx. 1.15 V (ECT is 88 °C {190 °F})
  • Racing (engine speed is 2, 000 RPM) (MAF: 4.32 g/s {0.571 lb/min}): Approx. 1.15 V (ECT is 89 °C {192 °F})
  • Racing (engine speed is 4, 000 RPM) (MAF: 12.71 g/s {1.681 lb/min}): Approx. 1.66 V (ECT is 89 °C {192 °F})
LOAD % Ratio of actual amount of intake air to the maximum air charging amount (mass volume) of cylinder
  • Idle (after warm up): Approx. 27.05% (ECT is 91 °C {196 °F})
  • Racing (engine speed is 2, 000 RPM): Approx. 16.86% (ECT is 89 °C {192 °F})
  • Racing (engine speed is 4, 000 RPM): Approx. 17.64% (ECT is 87 °C {189 °F})
TP_REL % Throttle valve opening angle (relative value) with value at throttle valve fully close timing as the start point
  • Accelerator pedal released: Approx. 12.15%
  • Accelerator pedal fully depressed: Approx. 81.96%

If simulation function of M-MDS is not used:

  1. Start the engine.
  2. Remove the seal cover. (See SEAL COVER REMOVAL/INSTALLATION ).
  3. Disconnect the evaporative hose between the purge solenoid valve and the charcoal canister.
  4. Put a finger to the purge solenoid valve and verify that there is no vacuum applied when the engine is cold.
    • If there is a vacuum, inspect the following:
  5. Set the vehicle on a dynamometer or chassis roller.
    WARNING:
    • When the dynamometer or chassis roller is operating, there is a possibility that the operator may come into contact with or be caught up in the rotating parts, leading to serious injuries or death. When performing work while the dynamometer or chassis roller is operating, be careful not to contact or be caught up in any of the rotating parts.
  6. Drive the vehicle at an engine speed to approx. 2000 RPM for 30 s or more.
  7. Put a finger to the purge solenoid valve and verify that there is no vacuum applied during Step 3.
    • If there is no vacuum, inspect the following:
    • If there is vacuum, inspect the following:
      • Evaporative hose (Purge solenoid valve*Charcoal canister)


Item (definition) Unit/Condition Definition Condition/Specification (Reference)
APP1 % Accelerator pedal opening angle (absolute value) input from APP sensor No. 1
  • Accelerator pedal released: Approx. 15.29%
  • Accelerator pedal fully depressed: Approx. 90.98%
V APP sensor No. 1 voltage
  • Accelerator pedal released: Approx. 0.77 V
  • Accelerator pedal fully depressed: Approx. 4.55 V
APP2 % Accelerator pedal opening angle (absolute value) input from APP sensor No. 2
  • Accelerator pedal released: Approx. 7.84%
  • Accelerator pedal fully depressed: Approx. 45.49%
V APP sensor No. 2 voltage
  • Accelerator pedal released: Approx. 0.38 V
  • Accelerator pedal fully depressed: Approx. 2.27 V
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