Subaru Select Monitor Display Details

Engine Load
Display: 0 - 100 %

The engine load is displayed. The ECM calculates the engine load via the engine speed and signals from the pressure sensor. The engine load increases when the engine speed and absolute pressure of the intake manifold increase.

Coolant Temp.
Display:-40 to 215 °C (-40 to 419 °F)

The coolant temperature transmitted from the engine coolant temperature sensor is displayed.

A/F Correction #1
Display: -100 to 99 %

Using the signal from the front oxygen (A/F) sensor, the correction value of the fuel supply amount regulated by the ECM is indicated. When the A/F is lean and when displayed value becomes 0 % or more, ECM increases the fuel. When the A/F is rich and when displayed value becomes 0 % or less, ECM decreases the fuel.

A/F Learning #1
Display: -100 to 99.2 %

The ECM calculates the long-term fuel trim value from the short-term fuel trim value. The long-term fuel trim value means the correction value of long- term fuel supply amount. If the displayed value is less than 0%, the fuel system is in rich status and the ECM restricts the fuel supply (by shortening the injector pulse). If the displayed value is more than 0%, the fuel system is in lean status and the ECM increases the fuel supply (by extending the injector pulse).

Main Absolute Pressure
Display: 0-254.9 kPa (0 - 1,912.5 mmHg, 0 - 75.3 inHg)

The pressure in the intake manifold is displayed. The ECM detects the pressure in the intake tube via the signal from the pressure sensor. The ECM calculates the air mass required for the engine.

Engine Speed
Display: 0 - 16,383 rpm

The engine speed transmitted from the crankshaft position sensor is detected.

Vehicle Speed
Display: 0-255 km/h (0-158 MPH)

The vehicle speed transmitted from the vehicle speed sensor is displayed.

Ignition Timing
Display: -64 to 63.5 deg.

The advanced ignition timing value is displayed. The ECM calculates the advanced ignition timing value using engine coolant temperature, engine speed, and engine load.

Intake Air Temp.
Display: 40 - 215 °C (104 - 419 °F)

The intake air temperature is displayed. The ECM detects the intake air temperature via the signal from the intake air temperature sensor, and corrects the ignition timing and fuel supply amount.

Rear O2 sensor
Display: 0-327.7 Volt

The ECM correct air-fuel ratio by the signal sent from O2 sensor. Also, the signal is used for catalyst degradation diagnosis.

Battery Voltage
Display: 0 - 20.4 V

The battery voltage is displayed.

Throttle Sensor Voltage
Display: 0-5 V

The throttle angle is displayed in voltage. When the throttle is fully-closed, the displayed voltage value is approx. 0.5 V. When it is fully-open, the voltage is approx. 4 V or more.

Fuel injection #1 Pulse
Display: 0 - 65.3 m/sec (0-214.2 l/sec)

The injector valve opening time is displayed. The longer the injector valve opening time, the more the fuel is supplied. The higher the engine load, the longer the injector valve opening time becomes.

Knocking Correction
Display: -64 to 63.5 deg.

The ECM controls the ignition timing via the signal from the knock sensor.

Atmosphere Pressure
Display: 0-254.9 kPa (0 - 1,912.5 mmHg, 0 - 75.3 inHg)

The atmospheric pressure is displayed. The ECM detects the atmospheric pressure via the signal from the atmosphere sensor.

Main. Relative Pressure
Display: 0-126.9 kPa (0-952 mmHg, 0- 37.5 inHg)

A value calculated by subtracting the absolute pressure in the intake tube from the atmospheric pressure is displayed. A larger load leads to a larger value.

Fuel tank pressure
Display: 0-3.2 kPa (0-24 mmHg, 0-0.94 inHg)

The pressure in the fuel tank is displayed.

Learned Ignition Timing
Display: -64 to 63.5 deg.

The advanced ignition timing value is displayed. The ECM calculates the learned ignition timing in each driving range via the signal from the knock sensor. A positive value indicates advanced timing, and a negative value indicates retarded timing.

Fuel Temp.
Display: -40 to 215 °C (-40 to 419 °F)

The fuel temperature is displayed. The ECM detects the fuel temperature via the signal from the fuel temperature sensor. This signal is used for the evaporation diagnosis.

Front 02 Heater #1
Display: 0 - 10 A

The heater current of the front oxygen (A/F) sensor is displayed. A larger current value leads to increased heat generation.

Rear O2 Heater Current
Display: 0 - 10 A

The heater current of the rear O2 sensor is displayed. A larger current value leads to increased heat generation.

Fuel Level
Display: 0-5 V

The float inside the fuel tank is a variable resistor which varies the resistance based on fuel level. The ECM then averages this voltage and the signal voltage from the fuel tank in order to determine fuel level. The scan tool displays close to 0.7 volts for an empty tank, and close to 5 volts for a full tank.

CPC Valve Duty Ratio
Display: 0 - 100 %

The purge control solenoid valve is regulated by the ECM. The displayed value of 0 % indicates that the purge amount is 0, and 100 % indicates that the purge amount becomes the maximum.

ISC Valve Step
Display: 0-255 step

The idle air control solenoid valve is driven by the stepping motor. The number of steps is regulated by the ECM. A value of 0 step indicates that the air bypass circuit is closed, and the value of 255 steps indicates that it is fully open.

A/F Sensor #1
Display: 0 - 2

The air surplus ratio output from the front oxygen (A/F) sensor is displayed. Air overflow ratio = 1.0 is regarded as a stoichiometric A/F ratio. A value above 1.0 indicates A/F lean range, and below 1.0 indicates A/F rich range.

A/F Correction #3
Display:

The correction value of fuel supply amount regulated by the ECM via the signal from the rear oxygen sensor is displayed.

AT Vehicle ID Signal
Display: ON or OFF

AT and MT vehicles are identified. For AT vehicles, ON is displayed, and for MT ones, OFF is displayed.

Neutral Position Switch
Display: ON or OFF

When the shift lever stays in the neutral position, ON is displayed. When in other positions, OFF is displayed.

Idle Switch Signal
Display: ON or OFF

When the accelerator pedal is released fully, ON is displayed. When depressed fully, OFF is displayed.

P/S Switch
Display: ON or OFF

When the steering wheel is turned fully, ON is displayed. When returned, OFF is displayed. This signal is used for idle control or other controls.

A/C Switch
Display: ON or OFF

When the A/C switch is turned ON, ON is displayed. When turned OFF, OFF is displayed. This signal is used for idle control or other controls.

Starter Switch
Display: ON or OFF

When the vehicle is cranking, ON is displayed. When not cranking, OFF is displayed.

Rear O2 Rich Signal
Display: ON or OFF

When the A/F ratio is rich, ON is displayed. When lean, OFF is displayed.

Knocking Signal
Display: ON or OFF

When knocking occurs and the ignition timing is retarded, ON is displayed. At any other time, OFF is displayed.

Crankshaft Position Signal
Display: ON or OFF

When a crankshaft signal exists, ON is displayed. At any other time (at engine stall), OFF is displayed.

Camshaft Position Sig.
Display: ON or OFF

When a camshaft signal exists, ON is displayed. At any other time (at engine stall), OFF is displayed.

Rear Defogger SW
Display: ON or OFF

When the rear defogger switch is turned ON, ON is displayed. When turned OFF, OFF is displayed. This signal is used for idle control or other controls.

Blower Fan SW
Display: ON or OFF

When the blower fan switch is turned ON, ON is displayed. When turned OFF, OFF is displayed. This signal is used for idle control or other controls.

Light Switch
Display: ON or OFF

When the light switch is turned ON, ON is displayed. When turned OFF, OFF is displayed. This signal is used for idle control or other controls.

A/C Compressor Signal
Display: ON or OFF

When the A/C clutch is engaged, ON is displayed. When disengaged, OFF is displayed.

Radiator Fan Relay #1, #2
Display: ON or OFF

When the radiator fan relay is ON (radiator operates), ON is displayed. When OFF (radiator stops), OFF is displayed.

Fuel Pump Relay
Display: ON or OFF

When the radiator fan relay is ON (fuel pump operates), ON is displayed. When OFF (fuel pump stops), OFF is displayed.

PCV Solenoid Valve
Display: ON or OFF

The status of the pressure control solenoid valve is displayed. When the pressure control solenoid valve is closed, OFF is displayed. When open, ON is displayed. During an evaporation leak diagnosis, the pressure control solenoid valve is only open when vacuum in the intake tube is taken into the fuel tank.

Vent Solenoid Valve
Display: ON or OFF

The status of the drain valve is displayed. When the drain valve is closed, ON is displayed. When open, OFF is displayed. Except during an evaporation leak diagnosis, the drain valve is always open.

Assist Air Sol. Valve
Display: ON or OFF

When the air assist injector solenoid valve is open, ON is displayed. When closed, OFF is displayed. The air assist injector solenoid valve opens to increase mass air flow at cold start, improving the mixture formation.

Tank Sensor Cont. Valve
Display: ON or OFF

When the atmospheric pressure solenoid valve is open, ON is displayed. When closed, OFF is displayed. The valve is only activated during a 0.02- inch evaporation leak diagnosis.

Torque Control Signal #1, #2
Display: ON or OFF

When a torque down signal exists, ON is displayed. When it doesn't, OFF is displayed.

Torque Permission Signal
Display: ON or OFF

The signal which notifies whether or not torque down is possible is displayed. This signal is transmitted from the ECU in response to a torque down signal from the TCU. When torque down is prohibited, ON is displayed. When permitted, OFF is displayed.