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Home >> Mazda >> 2021 >> CX-3 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Symptom Troubleshooting - Engine >> 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

Idle (after warm up)
  • Below 1°

Racing (engine speed is 2, 000 RPM)
  • Approx. 20.6°

Racing (engine speed is 4, 000 RPM)
  • Approx. 31.2°
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

Idle (after warm up)
  • Approx. 0°

Racing (engine speed is 2, 000 RPM)
  • Approx. 21.4°

Racing (engine speed is 4, 000 RPM)
  • Approx. 31.6°


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 29°C {84°F}: Approx. 2.65 V

Idle (after warm up)
  • ECT is 88°C {190°F}: Approx. 0.71 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 29°C {84°F}: Approx. 2.65 V

Idle (after warm up)
  • ECT is 88°C {190°F}: Approx. 0.71 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 20°C {68°F}: Approx. 2.70 V
  • IAT is 40°C {104°F}: Approx. 1.80 V
  • IAT is 60°C {140°F}: Approx. 1.20 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. 12.89°
  • Accelerator pedal fully depressed: Approx. 86.03°

Idle (after warm up)
  • Accelerator pedal released: Approx. 2.77-2.84° (ECT is 89°C {192°F})
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. 1.71 ms
  • Racing (engine speed is 2, 000 RPM): Approx. 1.35 ms
  • Racing (engine speed is 4, 000 RPM): Approx. 1.21 ms
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. 16%
  • Accelerator pedal fully depressed: Approx. 91%
V APP sensor No. 1 voltage
  • Accelerator pedal released: Approx. 0.78 V
  • Accelerator pedal fully depressed: Approx. 4.54 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. 0.39 V
  • Accelerator pedal fully depressed: Approx. 2.27 V
EVAPCP % Purge solenoid valve control duty value
  • Idle (after warm up): 0%
  • Racing (Engine speed 2, 000 RPM): 33-35% (ECT is 94°C {201°F})
  • Racing (Engine speed 4, 000 RPM): 53-55% (ECT is 94°C {201°F})
MAF g/Sec Mass air flow input from MAF sensor
  • Displays MAF
V MAF sensor voltage Without coolant control valve
  • Ignition switched ON (engine off) (MAF: 0.59 g/s {0.078 lb/min}): Approx. 0.72 V
  • Idle (after warm up) (MAF: 2.17 g/s {0.287 lb/min}): Approx. 0.97 V
  • Racing (engine speed is 2, 000 RPM) (MAF: 4.73 g/s {0.626 lb/min}): Approx. 1.26 V

With coolant control valve
  • Ignition switched ON (engine off) (MAF: 0.00 g/s {0 lb/min}): Approx. 1.69 V (ECT is 53°C {127°F})
  • Idle (after warm up) (MAF: 2.50 g/s {0.331 lb/min}): Approx. 1.89 V (ECT is 93°C {199°F})
  • Racing (engine speed is 2, 000 RPM) (MAF: 3.80 g/s {0.503 lb/min}): Approx. 2.02 V (ECT is 95°C {203°F})
LOAD % Ratio of actual amount of intake air to the maximum air charging amount (mass volume) of cylinder
  • Idle (after warm up): Approx. 22.35%
  • Racing (engine speed is 2, 000 RPM): Approx. 17.25%
  • Racing (engine speed is 4, 000 RPM): Approx. 19.21%
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%
  • Accelerator pedal fully depressed: Approx. 82%

If simulation function of M-MDS is not used:

  1. Start the engine.
  2. Remove the plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION .)
  3. Disconnect the vacuum 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:
      • Wiring harness and connectors (Purge solenoid valve-PCM terminal 1AI) (Without coolant control valve)
      • Wiring harness and connectors (Purge solenoid valve-PCM terminal 1AW) (With coolant control valve)
      • Purge solenoid valve (See PURGE SOLENOID VALVE INSPECTION .)
  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:
    • Wiring harness and connector (Main relay-Purge solenoid valve-PCM terminal 1AI) (Without coolant control valve)
    • Wiring harness and connector (Main relay-Purge solenoid valve-PCM terminal 1AW) (With coolant control valve)
    • Purge solenoid valve (See PURGE SOLENOID VALVE INSPECTION .)
    • If there is vacuum, inspect the following:
      • Vacuum 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. 16%
  • Accelerator pedal fully depressed: Approx. 91%
V APP sensor No. 1 voltage
  • Accelerator pedal released: Approx. 0.78 V
  • Accelerator pedal fully depressed: Approx. 4.54 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. 0.39 V
  • Accelerator pedal fully depressed: Approx. 2.27 V
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