LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2014 >> Q50 Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Introduction) (Except Hybrid) >> System Description >> Diagnosis System (ECM) >> Diagnosis Description >> CONSULT Function >> Data Monitor Mode
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Data Monitor Mode

NOTE:
  • The following table includes information (items) inapplicable to this vehicle. For information (items) applicable to this vehicle, refer to CONSULT display items.
  • For reference values of the following items, refer to "REFERENCE VALUE ".
MONITORED ITEM

Monitored item Unit Monitor Item Selection Description Remarks
ECU INPUT SIGNALS MAIN SIGNALS
ENG SPEED RPM x x
  • Indicates the engine speed computed from the signal of the crankshaft position sensor (POS) and camshaft position sensor (PHASE).
  • Accuracy becomes poor if engine speed drops below the idle RPM.
  • If the signal is interrupted while the engine is running, an abnormal value may be indicated.
MAS A/F SE-B1 V x x
  • The signal voltage of the mass air flow sensor is displayed.
  • When the engine is stopped, a certain value is indicated.
  • When engine is running, specification range is indicated in "SPEC".
MAS A/F SE-B2 x x
B/FUEL SCHDL ms x x
  • "Base fuel schedule" indicates the fuel injection pulse width programmed into ECM, prior to any learned on board correction.
  • When engine is running, specification range is indicated in "SPEC".
A/F ALPHA-B1 %    
  • The mean value of the air-fuel ratio feedback correction factor per cycle is indicated.
  • When the engine is stopped, a certain value is indicated.
  • This data also includes the data for the air-fuel ratio learning control.
  • When engine is running, specification range is indicated in "SPEC".
A/F ALPHA-B2    
COOLANT TEMP/S °C or °F x x
  • The engine coolant temperature (determined by the signal voltage of the engine coolant temperature sensor) is displayed.
  • When the engine coolant temperature sensor is open or short-circuited, ECM enters fail-safe mode. The engine coolant temperature determined by the ECM is displayed.
A/F SEN1 (B1) V x x
  • The A/F signal computed from the input signal of the air fuel ratio (A/F) sensor 1 is displayed.
  
HO2S2 (B1) V x x
  • The signal voltage of the heated oxygen sensor 2 is displayed.
  
HO2S2 (B2) x x
HO2S2 MNTR (B1) RICH/LEAN   x
  • Display of heated oxygen sensor 2 signal:

    RICH: means the amount of oxygen after three way catalyst is relatively small.

    LEAN: means the amount of oxygen after three way catalyst is relatively large.
  • When the engine is stopped, a certain value is indicated.
HO2S2 MNTR (B2)   x
VHCL SPEED SE km/h or mph x x
  • The vehicle speed computed from the vehicle speed signal sent from combination meter is displayed.
  
BATTERY VOLT V    
  • The power supply voltage of ECM is displayed.
  
ACCEL SEN 1 V    
  • The accelerator pedal position sensor signal voltage is displayed.
  • ACCEL SEN 2 signal is converted by ECM internally. Thus, they differs from ECM terminal voltage signal.
ACCEL SEN 2    
TP SEN 1-B1 V x x
  • The throttle position sensor signal voltage is displayed.
  • TP SEN 2-B1 signal is converted by ECM internally. Thus, they differs from ECM terminal voltage signal.
TP SEN 2-B1 x x
FUEL T/TMP SE °C or °F    
  • The fuel temperature (determined by the signal voltage of the fuel tank temperature sensor) is displayed.
  
EVAP SYS PRES V    
  • The signal voltage of EVAP control system pressure sensor is displayed.
  
FUEL LEVEL SE V x  
  • The signal voltage of the fuel level sensor is displayed.
  
START SIGNAL On/Off    
  • Indicates start signal status [On/Off] computed by the ECM according to the signals of engine speed and battery voltage.
  • After starting the engine, [Off] is displayed regardless of the starter signal.
CLSD THL POS On/Off x x
  • Indicates idle position [On/Off] computed by ECM according to the accelerator pedal position sensor signal.
  
AIR COND SIG On/Off x x
  • Indicates [On/Off] condition of the air conditioner switch as determined by the air conditioner signal.
  
PW/ST SIGNAL On/Off x x
  • [On/Off] condition of the power steering system (determined by the signal voltage of the power steering pressure sensor signal) is indicated.
  
LOAD SIGNAL On/Off x x
  • Indicates [On/Off] condition from the electrical load signal.

    On: Rear window defogger switch is ON and/or lighting switch is in 2nd position.

    Off: Both rear window defogger switch and lighting switch are OFF.

  
IGNITION SW On/Off x x
  • Indicates [On/Off] condition from ignition switch signal.
  
HEATER FAN SW On/Off x  
  • Indicates [On/Off] condition from the heater fan switch signal.
  
BRAKE SW On/Off    
  • Indicates [On/Off] condition from the stop lamp switch signal.
  
INJ PULSE-B1 msec    
  • Indicates the actual fuel injection pulse width compensated by ECM according to the input signals.
  • When the engine is stopped, a certain computed value is indicated.
INJ PULSE-B2    
IGN TIMING BTDC x x
  • Indicates the ignition timing computed by ECM according to the input signals.
  • When the engine is stopped, a certain value is indicated.
CAL/LD VALUE %    
  • "Calculated load value" indicates the value of the current air flow divided by peak air flow.
  
MASS AIRFLOW g/s    
  • Indicates the mass air flow computed by ECM according to the signal voltage of the mass air flow sensor.
  
PURG VOL C/V %    
  • Indicates the EVAP canister purge volume control solenoid valve control value computed by the ECM according to the input signals.
  • The opening becomes larger as the value increases.
  
INT/V SOL (B1) %    
  • The control value of the intake valve timing control solenoid valve (determined by ECM according to the input signals) is indicated.
  • The advance angle becomes larger as the value increases.
  
INT/V SOL (B2)    
AIR COND RLY On/Off    
  • The air conditioner relay control condition (determined by ECM according to the input signals) is indicated.
  
FUEL PUMP RLY On/Off    
  • Indicates the fuel pump relay control condition determined by ECM according to the input signals.
  
VENT CONT/V On/Off    
  • The control condition of the EVAP canister vent control valve (determined by ECM according to the input signals) is indicated.

    On: Closed

    Off: Open

  
THRTL RELAY On/Off    
  • Indicates the throttle control motor relay control condition determined by the ECM according to the input signals.
  
A/F S1 HTR (B2) %    
  • Air fuel ratio (A/F) sensor 1 heater control value computed by ECM according to the input signals.
  • The current flow to the heater becomes larger as the value increases.
  
HO2S2 HTR (B1) On/Off    
  • Indicates [On/Off] condition of heated oxygen sensor 2 heater determined by ECM according to the input signals.
  
HO2S2 HTR (B2)    
ALT DUTY SIG On/Off    
  • The control condition of the power generation voltage variable control (determined by ECM according to the input signals) is indicated.

    On: Power generation voltage variable control is active.

    Off: Power generation voltage variable control is inactive.

  
I/P PULLY SPD RPM    
  • Indicates the engine speed computed from the input speed sensor signal.
  
VEHICLE SPEED km/h or mph    
  • The vehicle speed computed from the vehicle speed signal sent from TCM is displayed.
  
IDL A/V LEARN Yet/CMPLT    
  • Displays the condition of Idle Air Volume Learning

    Yet: Idle air volume learning has not been performed yet.

    CMPLT: Idle air volume learning has already been performed successfully.

  
TRVL AFTER MIL km or mile    
  • Distance traveled while MIL is activated.
  
ENG OIL TEMP °C or °F    
  • The engine oil temperature (determined by the signal voltage of the engine oil temperature sensor) is displayed.
  
A/F S1 HTR (B1) %    
  • Air fuel ratio (A/F) sensor 1 heater control value computed by ECM according to the input signals.
  • The current flow to the heater becomes larger as the value increases.
  
VHCL SPEED SE km/h or mph    
  • The vehicle speed computed from the vehicle speed signal sent from combination meter is displayed.
  
MAIN SW On/Off    
  • Indicates [On/Off] condition from MAIN switch signal.
  
CANCEL SW On/Off    
  • Indicates [On/Off] condition from CANCEL switch signal.
  
RESUME/ACC SW On/Off    
  • Indicates [On/Off] condition from RESUME/ACCELERATE switch signal.
  
SET SW On/Off    
  • Indicates [On/Off] condition from SET/COAST switch signal.
  
BRAKE SW1 On/Off    
  • Indicates [On/Off] condition from brake pedal position switch signal.
  
BRAKE SW2 On/Off    
  • Indicates [On/Off] condition of stop lamp switch signal.
  
DIST SW On/Off    
  • Indicates [On/Off] condition from DISTANCE switch signal.
  
CRUISE LAMP On/Off    
  • Indicates [On/Off] condition of CRUISE lamp determined by the ECM according to the input signals.
  
FAN DUTY %    
  • Indicates a command value for cooling fan. The value is calculated by ECM based on input signals.
  
AC EVA TEMP °C or °F        
AC EVA TARGET °C or °F    
ALT DUTY %    
  • Indicates the duty ratio of the power generation command value. The ratio is calculated by ECM based on the battery current sensor signal.
  
BAT CUR SEN mV    
  • The signal voltage of battery current sensor is displayed.
  
A/F ADJ-B1 -    
  • Indicates the correction of factor stored in ECM. The factor is calculated from the difference between the target air-fuel ratio stored in ECM and the air-fuel ratio calculated from A/F sensor 1 signal.
  
A/F ADJ-B2    
TP SEN 1-B2 mV    
  • The throttle position sensor signal voltage is displayed.
  • TP SEN 2-B2 signal is converted by ECM internally. Thus, they differs from ECM terminal voltage signal.
TP SEN 2-B2    
P/N POSI SW On/Off x x
  • Indicates [On/Off] condition from the park/neutral position (PNP) signal.
  
INT/A TEMP SE °C or °F x x
  • The intake air temperature (determined by the signal voltage of the intake air temperature sensor) is indicated.
  
AC PRESS SEN V    
  • The signal voltage from the refrigerant pressure sensor is displayed.
  
A/F SEN1 (B2) V x x
  • The A/F signal computed from the input signal of the air fuel ratio (A/F) sensor 1 is displayed.
  
INT/V TIM (B1) °CA    
  • Indicates [°CA] of intake camshaft advance angle.
  
INT/V TIM (B2)    
MAP SENSOR V    
  • The signal voltage from the manifold absolute pressure (MAP) sensor is displayed.
  
EVAP LEAK DIAG Yet/CMPLT    
  • Indicates the condition of EVAP leak diagnosis.

    Yet: EVAP leak diagnosis has not been performed yet.

    CMPLT: EVAP leak diagnosis has been performed successfully.

  
EVAP DIAG READY On/Off    
  • Indicates the ready condition of EVAP leak diagnosis.

    On: Diagnosis has been ready condition.

    Off: Diagnosis has not been ready condition.

  
VVEL LEARN Yet/DONE    
  • Display the condition of VVEL learning

    Yet: VVEL learning has not been performed yet.

    DONE: VVEL learning has already been performed successfully.

  
VVEL SEN LEARN-B1 V    
  • Indicates the VVEL learning value.
  
VVEL SEN LEARN-B2    
VVEL POSITION SENB1 V    
  • The VVEL control shaft position sensor signal voltage is displayed.
  
VVEL POSITION SEN-B2    
VVEL TIM-B1 deg    
  • Indicates [deg] of VVEL control shaft angle.
  
VVEL TIM-B2    
FPCM Hi/Mid/Low/Off    
  • The control condition of the fuel pump control module (FPCM) (determined by ECM according to the input signals) is indicated.
  
BAT TEMP SEN V    
  • The signal voltage from the battery temperature sensor is displayed.
  
FUEL PUMP DUTY %    
  • The control condition of the fuel pump control module (FPCM) (determined by ECM according to the input signals) is indicated.
  
THRTL STK CNT B1 -    
NOTE: The item is indicated, but not used.
  
THRTL STK CNT B2    
HO2 S2 DIAG1 (B2) INCMP/CMPLT    
  • Indicates DTC P0159 self-diagnosis (delayed response) condition.

    INCMP: Self-diagnosis is incomplete.

    CMPLT: Self-diagnosis is complete.

  
A/F SEN1 DIAG1 (B2) INCMP/CMPLT    
  • Indicates DTC P015C or P015D self-diagnosis condition.

    INCMP: Self-diagnosis is incomplete.

    CMPLT: Self-diagnosis is complete.

  
A/F SEN1 DIAG1 (B1) INCMP/CMPLT    
  • Indicates DTC P015A or P015B self-diagnosis condition.

    INCMP: Self-diagnosis is incomplete.

    CMPLT: Self-diagnosis is complete.

  
A/F SEN1 DIAG2 (B2) INCMP/CMPLT    
  • Indicates DTC P014E or P014F self-diagnosis condition.

    INCMP: Self-diagnosis is incomplete.

    CMPLT: Self-diagnosis is complete.

  
A/F SEN1 DIAG2 (B1) INCMP/CMPLT    
  • Indicates DTC P014C or P014D self-diagnosis condition.

    INCMP: Self-diagnosis is incomplete.

    CMPLT: Self-diagnosis is complete.

  
A/F SEN1 DIAG3 (B2) ABSNT/PRSNT    
  • Indicates DTC P014C, P014D, P015A or P015B self-diagnosis condition.

    ABSNT: The vehicle condition is not within the diagnosis range.

    PRSNT: The vehicle condition is within the diagnosis range.

  
A/F SEN1 DIAG3 (B1) ABSNT/PRSNT    
  • Indicates DTC P014C, P014D, P015A or P015B self-diagnosis condition.

    ABSNT: The vehicle condition is not within the diagnosis range.

    PRSNT: The vehicle condition is within the diagnosis range.

  
HO2 S2 DIAG2 (B2) INCMP/CMPLT    
  • Indicates DTC P0159 self-diagnosis (slow response) condition.

    INCMP: Self-diagnosis is incomplete.

    CMPLT: Self-diagnosis is complete.

  
HO2 S2 DIAG2 (B1) INCMP/CMPLT    
  • Indicates DTC P0139 self-diagnosis (slow response) condition.

    INCMP: Self-diagnosis is incomplete.

    CMPLT: Self-diagnosis is complete.

  
HO2 S2 DIAG1 (B1) INCMP/CMPLT    
  • Indicates DTC P0139 self-diagnosis (delayed response) condition.

    INCMP: Self-diagnosis is incomplete.

    CMPLT: Self-diagnosis is complete.

  
SYSTEM 1 DIAGNOSIS A B2 INCMP/CMPLT    
  • Indicates DTC P117A self-diagnosis condition.
    • INCMP: Self-diagnosis is incomplete.
    • CMPLT: Self-diagnosis is complete.
  
SYSTEM 1 DIAGNOSIS A B1 INCMP/CMPLT    
  • Indicates DTC P117B self-diagnosis condition.
    • INCMP: Self-diagnosis is incomplete.
    • CMPLT: Self-diagnosis is complete.
  
SYSTEM 1 DIAGNOSIS B B2 ABSNT/PRSNT    
  • Indicates DTC P117A self-diagnosis condition.
    • ABSNT: Self-diagnosis standby
    • PRSNT: Under self-diagnosis
  
SYSTEM 1 DIAGNOSIS B B1 ABSNT/PRSNT    
  • Indicates DTC P117B self-diagnosis condition.
    • ABSNT: Self-diagnosis standby
    • PRSNT: Under self-diagnosis
  
NOTE: Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.
scientia non olet · About LEMON Manuals