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Home >> Nissan-Datsun >> 2012 >> Sentra Base, Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Introduction (MR20DE) (Except CALIFORNIA) >> Service Information >> Trouble Diagnosis >> CONSULT Function (ENGINE) >> Data Monitor Mode
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Data Monitor Mode

Monitored Item

Monitored item [Unit] Description Remarks
ENG SPEED [rpm] Indicates the engine speed computed from the signals 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] 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".
B/FUEL SCHDL [ms] "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.
  • When engine is running specification range is indicated in "SPEC".
  • This data also includes the data for the air/fuel ratio learning control.
COOLAN TEMP/S [°C] or [°F] 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] The A/F signal computed from the input signal of the A/F sensor 1 is displayed.  
HO2S2 (B1) [V] The signal voltage of the heated oxygen sensor 2 is displayed.  
HO2S2 MNTR(B1) [RICH/LEAN]
  • 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.
VHCL SPEED SE [km/h] or [mph] The vehicle speed computed from the vehicle speed signal 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, it differs from ECM terminal voltage signal.
ACCEL SEN 2 [V]
TP SEN 1-B1 [V] The throttle position sensor signal voltage is displayed. TP SEN 2-B1 signal is converted by ECM internally. Thus, it differs from ECM terminal voltage signal.
TP SEN 2-B1 [V]
FUEL T/TMP SE [°C] or [°F] The fuel temperature (determined by the signal voltage of the fuel tank temperature sensor) is displayed.  
INT/A TEMP SE [°C] or [°F] The intake air temperature (determined by the signal voltage of the intake air temperature sensor) is indicated.  
EVAP SYS PRES [V] The signal voltage of EVAP control system pressure sensor is displayed.  
FUEL LEVEL SE [V] 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] Indicates idle position [ON/OFF] computed by the ECM according to the accelerator pedal position sensor signal.  
AIR COND SIG [ON/OFF] Indicates [ON/OFF] condition of the air conditioner switch as determined by the air conditioner signal.  
P/N POSI SW [ON/OFF] Indicates [ON/OFF] condition from the park/neutral position (PNP) signal.  
PW/ST SIGNAL [ON/OFF] [ON/OFF] condition of the power steering system (determined by the signal sent from EPS control unit) is indicated.  
LOAD SIGNAL [ON/OFF]
  • 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] Indicates [ON/OFF] condition from ignition switch.  
HEATER FAN SW [ON/OFF] 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.
IGN TIMING [BTDC] 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 airflow divided by peak airflow.  
MASS AIRFLOW [g/s] Indicates the mass airflow 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 TIM(B1) [°CA] Indicates [°CA] of intake camshaft advanced angle.  
INT/V SOL(B1) [%]
  • The control value of the intake valve timing control solenoid valve (determined by ECM according to the input signal) is indicated.
  • The advance angle becomes larger as the value increases
 
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.  
COOLING FAN [HI/MID/LOW/OFF]
  • Indicates the condition of the cooling fan (determined by ECM according to the input signals).

  • HI: High speed operation
  • MID: Middle speed operation
  • LOW: Low speed operation
  • OFF: Stop
 
HO2S2 HTR (B1) [ON/OFF] Indicates [ON/OFF] condition of heated oxygen sensor 2 heater determined by ECM according to the input signals.  
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]
  • Display 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.  
A/F S1 HTR(B1) [%]
  • Indicates 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.
 
AC PRESS SEN [V] The signal voltage from the refrigerant pressure sensor is displayed.  
VHCL SPEED SE [km/h] or [mph] The vehicle speed computed from the vehicle speed signal sent from TCM is displayed.  
SET VHCL SPD [km/h] or [mph] The preset vehicle speed 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 ASCD brake switch signal.  
BRAKE SW2 [ON/OFF] Indicates [ON/OFF] condition of stop lamp switch signal.  
VHCL SPD CUT [NON/CUT]
  • Indicates the vehicle cruise condition.

  • NON: Vehicle speed is maintained at the ASCD set speed.
  • CUT: Vehicle speed increased to excessively high compared with the ASCD set speed, and ASCD operation is cut off.
 
LO SPEED CUT [NON/CUT]
  • Indicates the vehicle cruise condition.

  • NON: Vehicle speed is maintained at the ASCD set speed.
  • CUT: Vehicle speed decreased to excessively low compared with the ASCD set speed, and ASCD operation is cut off.
 
AT OD MONITOR [ON/OFF] Indicates [ON/OFF] condition of CVT according to the input signal from the TCM. For M/T models always "OFF" is displayed
AT OD CANCEL [ON/OFF] Indicates [ON/OFF] condition of CVT cancel signal sent from the TCM. For M/T models always "OFF" is displayed
CRUISE LAMP [ON/OFF] Indicates [ON/OFF] condition of CRUISE lamp determined by the ECM according to the input signals.  
SET LAMP [ON/OFF] Indicates [ON/OFF] condition of SET lamp determined by the ECM according to the input signals.  
A/F ADJ-B1 Indicates the correction 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 air fuel ratio (A/F) sensor 1 signal.  
ENG OIL TEMP [°C] or [°F] The engine oil temperature (determined by the signal voltage of the engine oil temperature 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.
 
HO2 S2 DIAG1 (B1) [INCMP/CMPLT]
  • Indicates DTC P0139 self-diagnosis (delayed 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.
 
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(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(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.
 
THRTL STK CNT B1
NOTE: The item is indicated, but not used.
 
NOTE: Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.