2009 Infiniti QX56 AWDFACTORY OEM SERVICE PROCEDURE

Data Monitor Mode

Monitored Item

DATA MONITOR MODE REFERENCE CHART

x: Applicable
Monitored item [Unit] ECM INPUT SIGNALS MAIN SIGNALS Description Remarks
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".
B/FUEL SCHDL [msec] 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.
  • When engine is running specification range is indicated in "SPEC".
  • This data also includes the data for the air-fuel ratio learning control.
A/F ALPHA-B2 [%]    
COOLAN 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 A/F sensor 1 is displayed.
  
A/F SEN1 (B2) [V] x x
HO2S2 (B1) [V] x x
  • The signal voltage of the heated oxygen sensor 2 is displayed.
  
HO2S2 (B2) [V] 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) [RICH/LEAN]   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, it differs from ECM terminal voltage signal.
ACCEL SEN 2 [V]    
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, it differs from ECM terminal voltage signal.
TP SEN 2-B1 [V] 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.
  
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.
  
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.
  
P/N POSI SW [ON/OFF] x x
  • Indicates [ON/OFF] condition from the park/neutral position (PNP) 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 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.
  
INT/V TIM (B1) [°CA]    
  • Indicates [°CA] of intake camshaft advanced angle.
  
INT/V TIM (B2) [°CA]    
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]   x
  • Indicates the throttle control motor relay control condition determined by the ECM according to the input signals.
  
COOLING FAN [HI/OFF]   x
  • The control condition of the cooling fan (determined by ECM according to the input signals) is indicated.

    HI: High 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 combination meter 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.
  
DIST SW [ON/OFF]    
  • Indicates [ON/OFF] condition from DISTANCE switch signal.
  
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.
  
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.

  
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.
  
A/F ADJ-B2    
NOTE: Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.