LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mazda >> 2018 >> 6 Touring >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (VIN M) >> Pcm Inspection >> Using The M-MDS
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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, FANL FAN2, FP, INJ_1, INJ_2, INJ_3, INJ_4, LAFS_CM, OIL_P_SOL, Test

-: 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(1)
(Active air shutter position)		 % Calculation
  • Active air shutter position is 0°: 0%
  • Active air shutter position is 90°: 100%
AIRSHUT_CAL(1)
(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 % Calculation
  • Accelerator pedal released: Approx. 15%
  • Accelerator pedal depressed: Approx. 90.58%
(APP sensor No. 1) 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
DIS_EMD
(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)		 % Calculation
  • Displays target coolant control valve opening angle
ENG_CL_V_POS_R
(Coolant control valve opening angle raw)		 % Input
  • Ignition switched ON (engine off): Approx. 63.92 %
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
(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
(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
(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
(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
  • Fuel pressure is 3.0 MPa {31 kgf/cm2 , 435 psi}: Approx. 0.92 V
  • Fuel pressure is 4.8 MPa {49 kgf/cm2 , 696 psi}: Approx. 1.17 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
(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
  • 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)(2)		 ° (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%
L0NGFT12
(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
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
(Engine oil solenoid valve)		 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
(Parking/neutral)		 Open/Closed Calculation
  • Selector lever at P position or N position: Closed
  • Except above: Open
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
  °C, °F Calculation
  • Displays thermostat monitor engine coolant temperature
TH_M
(Thermostat monitor)		 - 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) With active air shutter
(2) 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.
scientia non olet · About LEMON Manuals