2003 Infiniti M45FACTORY OEM SERVICE PROCEDURE

Data Monitor Mode

For DATA MONITOR mode descriptions, seeDATA MONITOR MODE DESCRIPTIONS  table.

DATA MONITOR MODE DESCRIPTIONS

Monitored Item ECM Input Signals Main Signals Description
ENG SPEED [RPM] Applicable Applicable (1) Indicates the engine speed computed from the crankshaft position sensor (POS) signal.
MAS A/F SE-B1 [V] Applicable Applicable (2) The signal voltage of the mass airflow sensor is displayed. When the engine is stopped, a certain value is indicated.
COOLAN TEMP/S [°C] or [°F] Applicable Applicable (3) The engine coolant temperature (determined by the signal voltage of the engine coolant temperature sensor) is displayed.
HO2S1 (B1) Or (B2) [V] Applicable Applicable To B1 Only The signal voltage of the heated oxygen sensor 1 (front) is displayed.
HO2S2 (B1) Or (B2) [V] Applicable N/A The signal voltage of the heated oxygen sensor 2 (rear) is displayed.
HO2S1 MNTR (B1) Or (B2) [RICH/LEAN] Applicable Applicable To B1 Only (4) Display of heated oxygen sensor 1 (front) signal during air-fuel ratio feedback control: RICH - means the mixture became "RICH", and control is being affected toward a leaner mixture. LEAN - means the mixture became "lean", and control is being affected toward a rich mixture.
HO2S2 MNTR (B1) Or (B2) [RICH/LEAN] Applicable N/A (2) 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.
VHCL SPEED SE [Km/h] or [MPH] Applicable Applicable The vehicle speed computed from the vehicle speed sensor signal is displayed.
BATTERY VOLT [V] Applicable Applicable The power supply voltage of ECM is displayed.
ACCEL SEN 1 Or 2 [V] Applicable Applicable To SEN 1 Only Accelerator pedal position sensor signal voltage is displayed.
THRTL SEN 1 Or 2 [V] Applicable Applicable To SEN 1 Only Throttle position sensor signal voltage is displayed.
FUEL T/TMP SE [°C] or [°F] Applicable N/A The fuel temperature judged from the fuel tank temperature sensor signal voltage is displayed.
INT/A TEMP SE [°C] or [°F] Applicable Applicable The intake air temperature determined by the signal voltage of the intake air temperature sensor is indicated.
EVAP SYS PRES [V] Applicable N/A The signal voltage of EVAP control system pressure sensor is displayed.
FUEL LEVEL SE [V] Applicable N/A The signal voltage of the fuel level sensor is displayed.
START SIGNAL [ON/OFF] Applicable Applicable (5) Indicates [ON/OFF] condition from the starter signal.
CLSD THL POS [ON/OFF] Applicable Applicable Indicates idle position [ON/OFF] computed by ECM according to the throttle position sensor signal.
AIR COND SIG [ON/OFF] Applicable Applicable Indicates [ON/OFF] condition of the air conditioner switch as determined by the air conditioner signal.
P/N POSI SW [ON/OFF] Applicable Applicable Indicates [ON/OFF] condition from the Park/Neutral Position (PNP) switch signal.
PW/ST SIGNAL [ON/OFF] Applicable Applicable [ON/OFF] condition of the power steering pressure switch determined by the power steering pressure signal is indicated.
LOAD SIGNAL [ON/OFF] Applicable Applicable Indicates [ON/OFF] condition from the electrical load signal and/or lighting switch. ON - rear defogger is operating and/or lighting switch is on. OFF - rear defogger is not operating and lighting switch is not on.
IGNITION SW [ON/OFF] Applicable N/A Indicates [ON/OFF] condition from ignition switch.
HEATER FAN SW [ON/OFF] Applicable N/A Indicates [ON/OFF] condition from heater fan switch signal.
BRAKE SW [ON/OFF] N/A N/A Indicates [ON/OFF] condition from stop lamp switch signal.
INJ PULSE-B1 Or B2 [msec] N/A Applicable To B1 Only 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.
B/FUEL SCHDL [msec] N/A N/A "Base fuel schedule" indicates the fuel injection pulse width programmed into ECM, prior to any learned on board correction.
IGN TIMING [BTDC] N/A Applicable (2) Indicates the ignition timing computed by ECM according to the input signals.
A/F ALPHA-B1 Or B2 [%] N/A Applicable 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.
CAL/LD VALUE [%] N/A N/A "Calculated load value" indicates the value of the current airflow divided by peak airflow.
MASS AIRFLOW [g m/s] N/A N/A Indicates the mass airflow computed by ECM according to the signal voltage of the mass airflow sensor.
PURG VOL C/V [%] N/A N/A 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) Or (B2) [°CA] N/A N/A Indicates [°CA] of intake camshaft advanced angle.
INT/V SOL (B1) Or (B2) [%] N/A N/A The control condition of intake valve timing control solenoid valve (determined by ECM according to input signals) is indicated. ON - intake valve timing control is operating. OFF - intake valve timing control is not operating.
VIAS S/V [ON/OFF] N/A N/A The control condition of VIAS control solenoid valve (determined by ECM according to input signals) is indicated. ON - VIAS control solenoid valve is operating. OFF - VIAS control solenoid valve is not operating.
AIR COND RLY [ON/OFF] N/A Applicable The air conditioner relay control condition (determined by ECM according to the input signal) is indicated.
FUEL PUMP RLY [ON/OFF] N/A Applicable Indicates the fuel pump relay control condition determined by ECM according to the input signals.
FPCM [HI/LOW] N/A Applicable The control condition of fuel pump control module (determined by ECM according to input signals) is indicated.
VC/V BYPASS/V [ON/OFF] N/A N/A The control condition of the vacuum cut valve bypass valve (determined by ECM according to the input signal) is indicated. ON - Open; OFF - Closed
VENT CONT/V [ON/OFF] N/A N/A The control condition of the EVAP canister vent control valve (determined by ECM according to the input signal) is indicated. ON - Closed; OFF - Open
THRTL RELAY [ON/OFF] N/A N/A Indicates throttle control motor relay control condition determined by ECM according to input signals.
HO2S1 HTR (B1) Or (B2) [ON/OFF] N/A N/A Indicates [ON/OFF] condition of heated oxygen sensor 1 heater (front) determined by ECM according to the input signals.
HO2S2 HTR (B1) Or (B2) [ON/OFF] N/A N/A Indicates [ON/OFF] condition of heated oxygen sensor 2 heater (rear) determined by ECM according to the input signals.
IDL A/V LEAN N/A N/A 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. INCMP - Idle air volume learning has not been performed successfully.
TRVL AFTER MIL [km] or [Mile] N/A N/A Distance traveled while MIL is activated.
TRGT FAN RPM [rpm] N/A N/A Target speed of cooling fan operation (determined by ECM according to input signals) is displayed.
RADIATOR TEMP [°C] Or [°F] N/A N/A Radiator coolant temperature (determined by radiator coolant temperature sensor signal) is displayed.
AC PRESS SEN [V] N/A N/A The signal voltage from the refrigerant pressure sensor is displayed.
CAN COMM [OK/NG]; CAN CIRC 1, 2, 3 Or 4 [OK/UNKWN] N/A N/A Indicates communication condition of CAN communication line.
(1) 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.
(2) When the engine is stopped, a certain value is indicated.
(3) 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.
(4) After turning ON the ignition switch, RICH is displayed until air-fuel mixture ratio feedback control begins. When the air-fuel ratio feedback is clamped, the value just before the clamping is displayed continuously.
(5) After starting the engine, [OFF] is displayed regardless of the starter signal.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.