LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Nissan-Datsun >> 2008 >> Quest Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - Introduction >> Trouble Diagnosis >> CONSULT-III Function (ENGINE) >> Data Monitor Mode >> Monitored Item
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Monitored Item

DATA MONITOR MODE

x: Applicable
Monitored item [Unit] Unit Description Remarks
ENG SPEED [rpm]
  • 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]
  • The signal voltage of the mass air flow sensor is displayed.
  • When the engine is stopped, a certain value is indicated.
B/FUEL SCHDL
 
[msec]
  • Base fuel schedule indicates the fuel injection pulse width programmed into ECM, prior to any learned on board correction.
 
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.
A/F ALPHA-B2 [%]  
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.
 
A/F SEN1 (B2) [V]
HO2S2 (B1) [V]
  • The signal voltage of the heated oxygen sensor 2 is displayed.
 
HO2S2 (B2) [V]
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.
HO2S2 MNTR (B2)
 
[RICH/LEAN]
VHCL SPEED SE
 
[km/h] or [mph]
  • 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, it differs from ECM terminal voltage signal.
ACCEL SEN 2 [V]
THRTL SEN 1 [V]
  • The throttle position sensor signal voltage is displayed.
  • THRTL SEN 2 signal is converted by ECM internally. Thus, it differs from ECM terminal voltage signal.
THRTL SEN 2 [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.
 
EGR TEMP SEN [V]
  • The signal voltage of EGR temperature sensor is displayed.
EVAP SYS PRES [V]
  • The signal voltage of EVAP control system pressure sensor is displayed.
 
FUEL LEVELSE [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 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) switch signal.
 
PW/ST SIGNAL
 
[ON/OFF]
  • [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]
  • 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 signal.
 
HEATER FAN SW
 
[ON/OFF]
  • Indicates [ON/OFF] condition from 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
 
[msec]
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 air flow divided by peak air flow.
 
MASS AIRFLOW
 
[g.m/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.
 
EGR VOL CON/V [step]
  • 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 TIM (B2)
 
[°CA]
INT/V SOL (B1) [%]
  • The control condition 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) [%]
VIAS S/V
 
[ON/OFF]
  • The control condition of the VIAS control solenoid valve (determined by ECM according to the input signals) is indicated.

    ON: VIAS control solenoid valve is operating.

    OFF: VIAS control solenoid valve is not operating.

 
AIR COND RLY
 
[ON/OFF]
  • The air conditioner relay control condition (determined by ECM according to the input signals) is indicated.
 
ENGINE MOUNT
 
[IDLE/TRVL]
  • The control condition of the electronic controlled engine mount (determined by ECM according to the input signals) is indicated.

    IDLE: Engine speed is below 950 rpm

    TRVL: Engine speed is above 950 rpm

 
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]
  • The control condition of the cooling fan (determined by ECM according to the input signals) is indicated.

    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.
 
HO2S2 HTR (B2)
 
[ON/OFF]
I/P PULLY SPD
 
[rpm]
  • Indicates the engine speed computed from the turbine revolution sensor signal.
 
VEHICLE SPEED
 
[km/h] or [MPH]
  • Indicates the vehicle speed computed from the revolution sensor signal.
 
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) [%]
  • 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.
 
A/F S1 HTR (B2) [%]
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 O/D according to the input signal from the TCM.
 
AT OD CANCEL
 
[ON/OFF]
  • Indicates [ON/OFF] condition of CVT O/D cancel signal sent from the TCM.
 
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 A/F sensor 1 signal.
 
A/F ADJ-B2 -