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Home >> Mazda >> 2025 >> CX-5 S >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (VIN L) >> Pcm Inspection >> Using The M-MDS
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Using The M-MDS

NOTE:
  1. Connect the M-MDS to the DLC-2.
  2. Switch the ignition ON.
  3. Measure the PID value.
    • If PID value is not within the specification, follow the instructions in Action column.
    NOTE:
    • The PID/DATA MONITOR function monitors the calculated value of the input/output signals in the PCM. Therefore, an output device malfunction is not directly indicated as a malfunction of the monitored value for the output device. If a monitored value of an output device is out of specification, inspect the monitored value of the input device related to the output control.
    • The simulation items that are used in the ENGINE CONTROL SYSTEM OPERATION INSPECTION are as follows.
      • ACCS, AIRSHUT_DSD, ARPMDES, EVAPCP, EVAPCV, FAN1, FAN2, FP, INJ_1, INJ_2, INJ_3, INJ_4, LAFS_CM, OIL_P_SOL, Test

    *: Vehicles with active air shutter system 

    -: Not applicable

    Item (definition) Unit/Condition Value type Condition/Specification (Reference)
    AAT (Ambient air temperature) °C, °F -
    • Displays ambient air temperature
    AC_PRES (Refrigerant pressure) KPa {MPA}, mBar {BAR}, psi, in H20 Calculation
    • Displays refrigerant pressure
    V Input
    • Refrigerant pressure is 1.0 MPa {10 kgf/cm2 , 145 psi}: Approx. 1.58 V
    • Refrigerant pressure is 1.1 MPa {11 kgf/cm2 , 160 psi}: Approx. 1.75 V
    • Refrigerant pressure is 1.2 MPa {12 kgf/cm2 , 174 psi}: Approx. 1.88 V
    AC_REQ (A/C request signal) Off/On Input
    • A/C switch OFF: Off
    • A/C switch ON: On
    ACCS (A/C relay) Off/On Input
    • A/C relay is OFF: Off
    • A/C relay is ON: On
    AIRSHUT_ACT (4) (Active air shutter position) % Calculation
    • Active air shutter position is 0°: 0%
    • Active air shutter position is 90°: 100%
    AIRSHUT_CAL (4) (Active air shutter position) Not Done/Completed Calculation
    • Displays active air shutter fully open/closed position learning status
    ALTF (Generator field coil control duty value) % Calculation
    • Ignition switched ON (engine off): 0%
    • Idle: Approx. 46%
    • Racing (Engine speed is 2, 000 rpm): Approx. 36%
    ALTF_ACT (Actually measured value of field coil current signal input from generator) % Calculation
    • Displays actual generator field current control duty value
    AMB_TEMP (Ambient air temperature) °C, °F Calculation
    • Displays ambient air temperature
    APP (Accelerator pedal position) % Calculation
    • Accelerator pedal released: Approx. 0%
    • Accelerator pedal depressed: Approx. 100%
    APP1 (APP sensor No. 1) % Calculation
    • Accelerator pedal released: Approx. 15%
    • Accelerator pedal depressed: Approx. 90.58%
    V Input
    • Accelerator pedal released: Approx. 0.75 V
    • Accelerator pedal depressed: Approx. 4.52 V
    APP2 (APP sensor No. 2) % Calculation
    • Accelerator pedal released: Approx. 7.45%
    • Accelerator pedal depressed: Approx. 45.49%
    V Input
    • Accelerator pedal released: Approx. 0.38 V
    • Accelerator pedal depressed: Approx. 2.26 V
    ARPMDES (Target engine speed) RPM Calculation
    • Displays target engine speed
    BARO (Barometric pressure) KPa {MPA}, mBar {BAR}, psi, in H20 Calculation
    • Displays BARO
    BOO (Brake switch No. 1 signal) High/Low Calculation
    • Brake pedal released: Low
    • Brake pedal depressed: High
    BPA (Brake switch No. 2 signal) High/Low Calculation
    • Brake pedal released: Low
    • Brake pedal depressed: High
    BT_AH_ACCMLTD (Battery accumulated amp hour (Ah)) - Calculation
    • Displays battery accumulated amp hour
    CATT11_DSD (Estimated catalytic converter temperature) °C, °F Calculation
    • Displays estimated catalytic converter temperature
    CHRGLP (Charging system warning light) Off/On Calculation
    • Charging system warning light not illuminated: Off
    • Charging system warning light illuminated: On
    CLR_DIST (Distance after DTC cleared) - Calculation
    • Displays the mileage after DTC cleared
    CLU_CUT_SW (1) (Starter interlock switch status) Off/On Calculation
    • Displays starter interlock switch status
    CLU_SW (1) (CPP switch status) Off/On Calculation
    • Displays CPP switch status
    CPP (1) (Clutch pedal position) Off/On Calculation
    • Clutch pedal released: Off
    • Clutch pedal depressed: On
    % Calculation
    • Clutch pedal released: Approx. 3%
    • Clutch pedal depressed: Approx. 99%
    CPP/PNP (1) (Shift lever position) Off/On Calculation
    • Other than neutral: Off
    • Neutral: On
    DIS_EMD (3) (Total traveled distance after EVAP monitoring is completed) km, ft, mi Calculation
    • Displays total traveled distance after EVAP monitoring is completed
    ECT (Engine coolant temperature) °C, °F Calculation
    • Displays ECT
    V Input
    • ECT is 20°C {68°F}: Approx. 3.10 V
    • ECT is 40°C {104°F}: Approx. 2.16 V
    • ECT is 60°C {140°F}: Approx. 1.40 V
    • ECT is 80°C {176°F}: Approx. 0.87 V
    • ECT is 100°C {212°F}: Approx. 0.54 V
    ECT2_V (ECT sensor No. 2 voltage) V Input
    • ECT is 20°C {68°F}: Approx. 3.10 V
    • ECT is 40°C {104°F}: Approx. 2.16 V
    • ECT is 60°C {140°F}: Approx. 1.40 V
    • ECT is 80°C {176°F}: Approx. 0.87 V
    • ECT is 100°C {212°F}: Approx. 0.54 V
    ENG_CL_V_POS (Coolant control valve opening angle) ° (deg) Calculation
    • Displays target coolant control valve opening angle
    ENG_CL_V_POS_R (Coolant control valve opening angle raw) ° (deg) Input
    • Ignition switched ON (engine off): Approx. 114°
    ENG_EX_FLW (Engine exhaust flow rate) - Calculation
    • Displays engine exhaust flow rate
    ENG_FRCTN_PER (Engine friction percent torque) % Calculation
    • Displays engine friction percent torque
    EOL (Engine oil level) mm, in Calculation
    • Displays engine oil level
    EOP (Engine oil pressure) KPa {MPA}, mBar {BAR}, psi, in H20 Calculation
    • Switch ignition ON (engine off): 0-1 kPa {0.00-0.01 kgf/cm2 , 0.0-0.1 psi}
    • Idle: Approx. 150 kPa {1.53 kgf/cm2, 21.8 psi}
    EOT2 (5) (Engine oil temperature from engine oil level sensor) °C, °F Calculation
    • Displays engine oil temperature
    EQ_RAT11 (Equivalence ratio (lambda)) - Calculation
    • Idle (after warm up): Approx. 1
    EQ_RAT11_DSD (Desired equivalence ratio (lambda)) - Calculation
    • Indicate target lambda (Excess air factor = supplied air amount/theoretical air/fuel ratio)
    ETC_ACT (Electric throttle control actual) ° (deg) Calculation Ignition switched ON (engine off) 
    • Accelerator pedal released: Approx. 12.89°
    • Accelerator pedal depressed: Approx. 86.03°

    Idle (after warm up) 
    • Accelerator pedal released: Approx. 3.87°
    ETC_DSD (Electric throttle control desired) % Calculation
    • Displays target TP angle (percent)
    ° (deg) Calculation
    • Displays target TP angle
    EVAPCP (Purge solenoid valve duty value) % Calculation
    • Idle (after warm up): 0% (Engine coolant temperature 59°C {140°F} or less)
    • Racing (Engine speed 2, 000 rpm): Approx. 4.7%
    • Racing (Engine speed 4, 000 rpm): Approx. 35.35%
    EVAPCV (3) (Evaporative emission canister vent valve) Off/On Calculation
    • Simulation item (EVAPCV) is ON: On
    FAN_DUTY Displays in the M-MDS but it does not operate.
    FAN1 (Cooling fan relay No. 1) Off/On Calculation
    • Cooling fan relay No. 1 not operating: Off
    • Cooling fan relay No. 1 operating: On
    FAN2 (Cooling fan relay No. 2) Off/On Calculation
    • Cooling fan relay No. 2 not operating: Off
    • Cooling fan relay No. 2 operating: On
    FAN3 Displays in the M-MDS but it does not operate.
    FCL (3) (Check fuel cap warning light) Off/On Calculation
    • Check fuel cap warning light not illuminated: Off
    • Check fuel cap warning light illuminated: On
    FIA (Fuel injection amount) - Calculation
    • Displays fuel injection amount
    FLI (Fuel level) % Calculation
    • Fuel gauge level F: Approx. 100%
    • Fuel gauge level E: Approx. 0%
    FP (Fuel pump relay) Off/On Calculation
    • Ignition switched ON (engine off): Off
    • Cranking: On
    • Idle (after warm up): On
    FP_DUTY (Fuel pump control module) % Calculation
    • Ignition switched ON (engine off): Approx. 56.72%
    • Cranking: Approx. 95%
    • Idle (after warm up): Approx. 56.72%
    FRP (Fuel distributor pressure) KPa {MPA}, mBar {BAR}, psi, in H20 Calculation
    • Displays fuel distributor pressure
    FRP_A (Actual fuel distributor pressure) KPa {MPA}, mBar {BAR}, psi, in H20 Calculation
    • Ignition switched ON (engine off): Approx. 3.36 MPa {34.3 kgf/cm2 , 487 psi}
    • Idle (after warm up): Approx. 2.96-3.13 MPa {30.2-31.9 kgf/cm2 , 430-453 psi}
    • Racing (engine speed is 2, 000 rpm): Approx. 3.3 MPa {34 kgf/cm2 , 479 psi}
    • Racing (engine speed is 4, 000 rpm): Approx. 4.94 MPa {50.4 kgf/cm2 , 716 psi}
    FRP_A_CMD (Target fuel distributor pressure) KPa {MPA}, mBar {BAR}, psi, in H20 Calculation
    • Ignition switched ON (engine off): Approx. 6 MPa {61 kgf/cm2 , 870 psi}
    • Idle (after warm up): Approx. 3.1 MPa {32 kgf/cm2 , 450 psi}
    • Racing (engine speed is 2, 000 rpm): Approx. 3.37 MPa {34.4 kgf/cm2 , 489 psi}
    • Racing (engine speed is 4, 000 rpm): Approx. 4.97 MPa {50.7 kgf/cm2 , 721 psi}
    FRP_A_CMD_S (Presence/non-presence of target fuel distributor pressure) No/Yes Calculation
    • With fuel distributor: Yes
    • Without fuel distributor: No
    FRP_A_S (Presence/non-presence of actual fuel distributor) No/Yes Calculation
    • With fuel distributor: Yes
    • Without fuel distributor: No
    FRT_A (Fuel distributor temperature) °C, °F Calculation
    • Displays fuel distributor temperature
    FT_A_S (Presence/non-presence of fuel distributor temperature) No/Yes Calculation
    • With fuel distributor: Yes
    • Without fuel distributor: No
    FTP (3) (Fuel tank pressure sensor) KPa {MPA}, mBar {BAR}, psi, in H20 Calculation
    • Displays fuel tank pressure
    V Input
    • Fuel tank pressure is equal to barometric pressure: Approx. 2.5 V
    FUEL_P_DSD (Fuel pressure desired) KPa {MPA}, mBar {BAR}, psi, in H20 Calculation
    • Displays target fuel pressure
    FUEL_PRES (Fuel pressure sensor) KPa {MPA}, mBar {BAR}, psi, in H20 Calculation
    • Displays fuel pressure
    V Input Idle (ECT 80°C {176°F})
    • Fuel pressure is 10 MPa {102 kgf/cm2 , 1450 psi}: Approx. 1.4 V
    FUELPW (Fuel injector duration) Sec Calculation
    • Idle (after warm up): Approx. 1.26 ms
    • Racing (engine speed is 2, 000 rpm): Approx. 1.2 ms
    • Racing (engine speed is 4, 000 rpm): Approx. 1.1 ms
    FUELSYS (Fuel system status) OL/CL/OL_Drive/OL_Fault/CL_Fault Calculation
    • Idle (after warm up): OL or CL
    • Racing (engine speed is 2, 000 rpm): CL
    • Deceleration fuel cut (accelerator pedal released from engine speed of 4, 000 rpm or more): OL-Drive
    GEAR (2) (Gear commanded) Unknown/1st/2nd/3rd/4th/5th/6th/Not in P/Park/Neutral/Drive/Reverse Calculation
    • Selector lever at P position: Park
    • Selector lever at R position: Reverse
    • Selector lever at N position: Neutral
    • Selector lever in 1GR at D position: 1st
    HTR11 (A/F sensor heater) Off/On Calculation
    • Ignition switched ON (engine off): Off
    • Idle (after warm up): On
    % Calculation
    • Ignition switched ON (engine off): 0%
    • Idle (after warm up): Approx. 43%
    HTR12 (HO2S heater control) Off/On Calculation
    • Ignition switched ON (engine off): Off
    • Idle (after warm up): On
    % Calculation
    • Ignition switched ON (engine off): 0%
    • Idle (after warm up): Approx. 53%
    IAT (Intake air temperature No. 1) °C, °F Calculation
    • Displays IAT (No. 1)
    V Input
    • 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
    IAT2 (Intake air temperature No. 2) °C, °F Calculation
    • Displays IAT (No. 2)
    V Input
    • IAT2 is 20°C {68°F}: Approx. 3.57 V
    • IAT2 is 40°C {104°F}: Approx. 2.70 V
    • IAT2 is 60°C {140°F}: Approx. 1.87 V
    INGEAR (Gears are engaged) Off/On Calculation MTX 
    • When the following conditions are satisfied: On
      • Other than neutral
      • Clutch pedal released
    • Except above: Off

    ATX 
    • Selector lever at P position or N position: Off
    • Except above: On
    ISC_FBK (ISC feedback value) % Calculation
    • Displays ISC feedback value
    ISC_FBK_LRN (Learning value for calculating ISC feedback amount) % Calculation
    • Displays learning value for calculating ISC feedback amount
    IVS (Idle flag) Off Idle/Idle Calculation
    • Other than idling: Off Idle
    • Idle: Idle
    KNOCKR (Ignition timing correction for suppressing engine knock) (6) ° (deg) Calculation
    • Ignition switched ON (engine off): 0°
    • Idle (after warm up): 0°
    LAFS_CM Displays in the M-MDS but it does not operate.
    LOAD (Engine load) % Calculation
    • Idle (after warm up): Approx. 16.07%
    • Racing (engine speed is 2, 000 rpm): Approx. 13.33%
    • Racing (engine speed is 4, 000 rpm): Approx. 15.29%
    LONGFT1 (Long term fuel trim) % Calculation
    • Idle (after warm up): Approx. -3.9%
    • Racing (engine speed is 2, 000 rpm): Approx. -0.78%
    • Racing (engine speed is 4, 000 rpm): Approx. -0.78%
    LONGFT12 (Long term fuel trim (HO2S)) % Calculation
    • Idle (after warm up): Approx. 0%
    LOW_OIL (Engine Oil Level Status) Never Detected/Detected Calculation
    • Ignition switched ON (engine off): Detected
    • Idle (after warm up): Never Detected
    LRN_KCS (Knock control system learning value) - Calculation
    • Displays knock control system learning value
    M_GEAR (1) (Manual Gear Position) Neutral/1st gear/2nd gear/3rd gear/4th gear/5th gear/6th gear/Reverse/Undefined/Auto/In_Progress/YSF/Error Calculation
    • Displays manual gear position
    MAF (Mass airflow) g/Sec Calculation
    • Displays MAF
    V Input
    • 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})
    MAP (Manifold absolute pressure) KPa {MPA}, mBar {BAR}, psi, in H20 Calculation
    • Displays MAP
    MAP_V (MAP sensor voltage) V Input
    • Ignition switched ON (engine off) (MAP:100 kPa {1.02 kgf/cm2 , 14.5 psi}): Approx. 4.04 V
    • Idle (after warm up) (MAP: 35 kPa {0.36 kgf/cm2 , 5.1 psi}): Approx. 1.40 V
    • Racing (engine speed is 2, 000 rpm) (MAP: 26 kPa {0.27 kgf/cm2 , 3.8 psi}): Approx. 1.01 V
    MF_CAT_2 (Number of misfires corresponding to possible catalytic converter damage (No. 2 cylinder)) - Calculation
    • Displays number of misfires corresponding to possible catalytic converter damage (No. 2 cylinder)
    MF_CAT_3 (Number of misfires corresponding to possible catalytic converter damage (No. 3 cylinder)) - Calculation
    • Displays number of misfires corresponding to possible catalytic converter damage (No. 3 cylinder)
    MF_CAT_4 (Number of misfires corresponding to possible catalytic converter damage (No. 4 cylinder)) - Calculation
    • Displays number of misfires corresponding to possible catalytic converter damage (No. 4 cylinder)
    MF_CAT_FCC (Number of misfire determinations (for catalytic converter)) - Calculation
    • Displays number of misfire determinations (for catalytic converter)
    MF_CAT_TTL (Number of misfires corresponding to possible catalytic converter damage (total)) - Calculation
    • Displays number of misfires corresponding to possible catalytic converter damage (total)
    MF_CAT1 (Number of misfires corresponding to possible catalytic converter damage (No. 1 cylinder)) - Calculation
    • Displays number of misfires corresponding to possible catalytic converter damage (No. 1 cylinder)
    MF_EMI_2 (Number of misfires possibly affecting emission (No. 2 cylinder)) - Calculation
    • Displays number of misfires possibly affecting emission (No. 2 cylinder)
    MF_EMI_3 (Number of misfires possibly affecting emission (No. 3 cylinder)) - Calculation
    • Displays number of misfires possibly affecting emission (No. 3 cylinder)
    MF_EMI_4 (Number of misfires possibly affecting emission (No. 4 cylinder)) - Calculation
    • Displays number of misfires possibly affecting emission (No. 4 cylinder)
    MF_EMI_FCC (Number of misfire determinations (for emission)) - Calculation
    • Displays number of misfire determinations (for emission)
    MF_EMI_TTL (Number of misfires possibly affecting emission (total)) - Calculation
    • Displays number of misfires possibly affecting emission (total)
    MF_EMI1 (Number of misfires possibly affecting emission (No. 1 cylinder)) - Calculation
    • Displays number of misfires possibly affecting emission (No. 1 cylinder)
    MIL (Check engine light) Off/On Calculation
    • Check engine light not illuminated: Off
    • Check engine light illuminated: On
    MIL_DIS (Travelled distance since the check engine light illuminated) km, ft, mi Calculation
    • Displays travelled distance since the check engine light illuminated
    O2S11 (A/F sensor) μA Input
    • Idle (after warm up): Approx. -39 μA
    • Deceleration fuel cut (accelerator pedal released from engine speed of 4, 000 rpm or more): Approx. 3.84 mA
    O2S12 (HO2S) V Input
    • Idle (after warm up): 0-1.0 V
    • Deceleration fuel cut (accelerator pedal released from engine speed of 4, 000 rpm or more): Approx. 0 V
    OIL_P_SOL (Estimated engine oil pressure) Off/On Calculation
    • ECT above 98°C {208°F} or engine speed above 4, 000 rpm: Off
    • ECT below 98°C {208°F} and engine speed below 4, 000 rpm: On
    OIL_PRES (Engine oil solenoid valve) V Calculation
    • Displays estimated engine oil pressure
    OIL_TEMP (Estimated engine oil) °C, °F Calculation
    • Displays estimated engine oil temperature
    V Calculation
    • Displays estimated engine oil temperature voltage
    PN_SW (2) (Parking/neutral) Open/Closed Calculation
    • Selector lever at P position or N position: Closed
    • Except above: Open
    REV_SW (1) (Back-up light switch status) Off/On Calculation
    • Displays back-up light switch status
    RO2FT1 (HO2S fuel trim) % Calculation
    • Idle (after warm up): Approx. 1.5%
    • Deceleration fuel cut (accelerator pedal released from engine speed of 4, 000 rpm or more): Approx. 3.99%
    RPM (Engine speed) RPM Calculation
    • Displays engine speed
    SHRTFT1 (Short term fuel trim) % Calculation
    • Idle (after warm up): Approx. 2.34%
    • Racing (engine speed is 2, 000 rpm): Approx. 3.9%
    • Racing (engine speed is 4, 000 rpm): Approx. 1.56%
    SHRTFT12 (Short term fuel trim (HO2S)) % Calculation
    • Idle (after warm up): Approx. 0%
    SPARKADV (Ignition timing) ° (deg) Calculation
    • Displays ignition timing
    Test (Test mode) Off/On Calculation
    • Test mode OFF: Off
    • Test mode ON: On
    TH_M (Thermostat monitor) °C, °F Calculation
    • Displays thermostat monitor engine coolant temperature
    - Calculation
    • Displays thermostat monitor heat radiation ratio
    TH_M_MAX (Thermostat monitor) °C, °F Calculation
    • Displays thermostat monitor engine coolant temperature (max limit)
    - Calculation
    • Displays thermostat monitor heat radiation ratio (max limit)
    TH_M_MIN (Thermostat monitor) °C, °F Calculation
    • Displays thermostat monitor engine coolant temperature (min limit)
    - Calculation
    • Displays thermostat monitor heat radiation ratio (min limit)
    Time_D_LR (Lean to rich delayed time) Sec Calculation
    • Displays lean to rich delayed time
    Time_D_RL (Rich to lean delayed time) Sec Calculation
    • Displays rich to lean delayed time
    Time_SR_LR (Lean to rich slow response time) Sec Calculation
    • Displays lean to rich slow response time
    Time_SR_RL (Rich to lean slow response time) Sec Calculation
    • Displays rich to lean slow response time
    TP_REL (Relative throttle position) % Calculation
    • Accelerator pedal released: Approx. 12%
    • Accelerator pedal depressed: Approx. 82%
    TP1 (TP sensor No. 1) V Input
    • Accelerator pedal released: Approx. 1.11 V
    • Accelerator pedal depressed: Approx. 4.59 V
    % Calculation
    • Accelerator pedal released: Approx. 22%
    • Accelerator pedal depressed: Approx. 92%
    TP2 (TP sensor No. 2) V Input
    • Accelerator pedal released: Approx. 3.92 V
    • Accelerator pedal depressed: Approx. 0.41 V
    % Calculation
    • Accelerator pedal released: Approx. 22%
    • Accelerator pedal depressed: Approx. 92%
    TPCT (TP sensor No. 1 voltage at CTP) V Input
    • Ignition switched ON (engine off): Approx. 0.5 V
    TPCT2 (TP sensor No. 2 voltage at CTP) V Input
    • Ignition switched ON (engine off): Approx. 4.5 V
    VPWR (Battery positive voltage) V Input
    • Displays battery voltage
    VSS (Vehicle speed) KPH, MPH Calculation
    • Displays vehicle speed
    VT_Adv_CM
    • Displays in the M-MDS but it does not operate.
    VT_CM
    VT EX_DES (Desired exhaust valve timing) ° (deg) Calculation
    • Displays desired exhaust valve timing
    VT IN_ACT (Actual intake valve timing) ° (deg) Calculation
    • Displays actual intake valve timing
    VT IN_DES (Desired intake valve timing) ° (deg) Calculation
    • Displays desired intake valve timing
    VT_EX_ACT (Actual exhaust valve timing) ° (deg) Calculation
    • Displays actual exhaust valve timing
    VT_EX_DUTY (OCV control) % Calculation
    • Idle (after warm up): Approx. 0%
    • Racing (engine speed is 2, 000 rpm): Approx. 40%
    (1) MTX

    (2) ATX

    (3) U.S.A. and CANADA

    (4) Vehicle with active air shutter

    (5) Vehicle with engine oil level sensor

    (6) Performs retard correction (negative indication) according to the occurrence of engine knock, and it approaches approx. 0° by the advance correction due to engine knock suppression.
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