Scan Tool Testing and Procedures
Scan Tool Data
ECM
Since the data values are standard values estimated on the basis of values obtained from the normally operating vehicles by using a scan tool, use them as reference values. Even when the vehicle is in good condition, there may be cases where the checked value does not fall within each specified data range. Therefore, do not judge things to be abnormal just by checking the data alone.
Also, conditions that can be checked with a scan tool are those detected by ECM and output from ECM as commands and there may be cases where the engine or actuator is not operating (in the condition) as indicated by the scan tool. Be sure to use the timing light to check the ignition timing. Testing and Inspection
NOTE:
- With the generic scan tool, only asterisk (*) data in the following table can be read.
- When checking the data with the engine running at idle or racing, be sure to place gear shift lever in "Neutral" (M/T model) or select lever in "P" range (CVT model) and apply the parking brake lever fully. Also, if nothing or "no load" is indicated, turn OFF A/C, all electric loads, and P/S.
- Refer to Scan Tool Testing and Procedures Scan Tool Data
for the parameter related to cruise control system.
- For "Ignition mode" described in the following table, it means power supply mode in keyless push start system.
For more details of ignition mode, refer to Description of Keyless Engine Start Function Description of Keyless Engine Start Function.
Scan Tool Data Definitions
Fuel System (Fuel System Status)
A/F ratio feedback loop status is displayed as follows.
OL: Open-loop has not yet satisfied engine conditions (ECT > 10 °C, IAT, TP, A/F sensor/system = OK) to go to closed-loop.
CL: Closed-loop using oxygen sensor(s) as feedback for fuel control.
OL-DRIVE: Open-loop due to driving conditions (Power enrichment, etc.).
OL-FAULT: Open-loop due to detected system fault.
CL-FAULT: Closed-loop due to detected system fault.
Short Term Fuel Trim (%)
Short term fuel trim value represents short term corrections to the air/fuel mixture computation. A value of 0 indicates no correction, a value greater than 0 means an enrichment correction, and a value less than 0 implies an enleanment correction.
Long Term Fuel Trim (%)
Long term fuel trim value represents long term corrections to the air/fuel mixture computation. A value of 0 indicates no correction, a value greater than 0 means an enrichment correction, and a value less than 0 implies an enleanment correction.
Total Fuel Trim (%)
The value of Total Fuel Trim is obtained by calculating based on values of Short Term Fuel Trim and Long Term Fuel Trim. This value indicates how much correction is necessary to keep the air/fuel mixture stoichiometrical.
Inj Pulse Width (Fuel Injection Pulse Width, msec.)
This parameter indicates time of the injector drive (valve opening) pulse which is output from ECM (but injector drive time of NO.1 cylinder for multiport fuel injection).
Ignition Advance (Ignition Timing Advance for NO.1 Cylinder, ° BTDC)
Ignition timing of No.1 cylinder commanded by ECM. The actual ignition timing should be checked using a timing light.
Calculated Load (Calculated Load Value, %)
This parameter indicates calculated engine load in percent based on input to ECM from various engine sensors.
Engine Speed (rpm)
It is computed from reference pulses from the camshaft position sensor.
Desired Idle (Desired Idle Speed, rpm)
The Desired Idle Speed is an ECM internal parameter which indicates idle speed requested by ECM. If the engine is not running, this number is not valid.
MAF (Mass Air Flow rate, g/sec, lb/min.)
It represents total mass of air entering intake manifold which is measured by MAF sensor.
Vehicle Speed (km/h, mph)
It is computed based on pulse signals from front wheel speed sensors.
ECT (Engine Coolant Temperature, °C, °F)
It is detected by engine coolant temperature sensor.
Intake Air Temperature. (°C, °F)
It is detected by intake air temperature sensor.
Barometric Pres (kPa, mmHg, inHg, bar)
This parameter represents a measurement of barometric air pressure and is used for altitude correction of the fuel injection quantity.
EVAP Canist Prg Duty (EVAP Canister Purge Flow Duty, %)
This parameter indicates valve ON (valve open) time rate within a certain set cycle of EVAP canister purge valve which controls the amount of EVAP purge.
VVT Gap (Target Actual Position, °)
It is calculated using the formula: target valve timing advance-actual valve timing advance.
IAC Throttle Opening (Idle Air Throttle Valve Opening, %)
This parameter indicates throttle valve opening of idle air control in %.
(100% indicates the maximum idle air flow.)
TP Sensor 1 Volt (TP Sensor (Main) Output Voltage, V)
TP Sensor (Main) reading provides throttle valve opening information in the form of voltage.
TP Sensor 2 Volt (TP Sensor (SUB) Output Voltage, V)
TP Sensor (Sub) reading provides throttle valve opening information in the form of voltage.
APP Sensor 1 Volt (APP Sensor (Main) Output voltage, V)
APP Sensor (Main) reading provides accelerator pedal opening information in the form of voltage.
APP Sensor 2 Volt (APP Sensor (sub) Output Voltage, V)
APP Sensor (Sub) reading provides accelerator pedal opening information in the form of voltage.
Accel Position (Absolute Accelerator Pedal Position, %)
When accelerator pedal is in fully position, accelerator pedal position is indicated as 0 - 2% and 90 - 100% when it is in fully depressed position.
Throttle Position (Absolute Throttle Position, %)
When TP sensor is at fully closed position, throttle opening is indicated as 0 - 6% and 90 - 100% full open position.
Target throttle Posi (Target throttle Valve Position, %)
Target Throttle Valve Position is ECM internal parameter which indicates the throttle valve position requested by ECM.
Throttle Motor Volt (Throttle Actuator Supply Voltage) (V)
This parameter indicates power supply voltage of throttle actuator (motor) drive circuit (input voltage from throttle actuator control relay).
O2S B1 S2 (HO2S, V)
It indicates output voltage of HO2S installed on exhaust No.1 pipe (post-TWC). It is used to detect catalyst deterioration.
A/F B1 S1 Current (A/F Sensor Output Current, mA)
This parameter indicates output current of A/F sensor installed on exhaust manifold (pre-TWC).
Battery Voltage (V)
This parameter indicates battery positive voltage inputted from main relay to ECM.
Fuel Tank Level (%)
This parameter indicates approximate fuel level in fuel tank. Detectable range of fuel level sensor is set as 0 to 100%.
A/C Pressure (A/C Refrigerant Absolute Pressure, kPa)
This parameter indicates A/C refrigerant absolute pressure detected by A/C refrigerant pressure sensor.
Generator Cont Duty (Generator Control Duty, %)
This parameter indicates generator control duty ratio that controls production electricity of generator by ECM.
100%: No limitation for the generating
0%: Maximum limitation for the generating
Generator Field Duty (Generator Field Coil Duty, %)
This parameter indicates operating rate (status of production electricity) for generator by field coil duty ratio.
100%: maximum operation.
0%: minimum operation.
Leak check P sensor (EVAP Leak check Pressure sensor, in.Hg, kPa)
This parameter indicates the pressure in the EVAP system.
It is equal to the barometric pressure while EVAP vent valve control is OFF (valve open).
When EVAP leak check module operates, the pressure indicates EVAP system pressure.
Radiator Fan (Radiator Cooling Fan Control Relay, Low/Mid/High/Off)
Low: ON command is being output to radiator cooling fan relay No.1.
Mid: ON command is being output to radiator fan relay No.1 and No.3
High: ON command is being output to radiator cooling fan relay No.1, No.2 and No.3.
Off: No command being output.
A/C Comp Relay (A/C Compressor Relay, ON/OFF)
This parameter indicates the state of the A/C compressor relay.
Leak Check Pump (Mon) (EVAP Leak Detection Pump, ON / OFF)
ON: ON command is being output to EVAP leak detecting pump.
OFF: ON command is not being output.
Fuel Pump (ON / OFF)
ON is displayed when ECM activates the fuel pump via the fuel pump relay switch.
Intake Tuning Sol (Com) (Intake Tuning Solenoid Command, Open / Close)
This parameter indicates the state of IMT valve actuator.
Throttle Motor Relay (ON/OFF)
ON: Throttle actuator control relay is activated by ECM.
OFF: Throttle actuator control relay is stopped by ECM.
Starter SW (Starter Switch, ON / OFF)
This parameter indicates condition of starting motor relay output.
ON: Starting motor relay is ON
OFF: Starting motor relay is OFF
A/C Switch (ON/OFF)
ON: Command for A/C operation is being output from ECM to HVAC.
OFF: Command for A/C operation is not being output.
Blower Fan (ON/OFF)
This parameter indicates the state of the blower speed selector.
Brake Switch (ON/OFF)
This parameter indicates the state of the brake switch.
Electric Load (ON/OFF)
ON: Headlight, small light or rear defogger ON signal is inputted.
OFF: Above electric loads all turned OFF.
PNP Signal (P/N or D range) (CVT model)
It indicates whether the transmission range switch is in P or N range or other ranges are displayed. If it is in P or N range, "P/N" is displayed and if it is in a range other than "P" or "N", "D" is displayed.
Clutch SW (Declutch / Clutched)
Declutch: Clutch pedal fully depressed
Clutched: Clutch pedal released
Fuel Cut (ON/OFF)
ON: Fuel is being cut (output signal to injector is stopped)
OFF: Fuel is not being cut
Closed Throttle Pos (Closed Throttle Position, ON/OFF)
This parameter reads ON when throttle valve is fully closed, or OFF when it is not fully closed.
O2S B1 S2 ACT (HO2S, Active / Inactive)
This parameter indicates the activation condition of HO2S
ACTIVE: The sensor is activated.
INACTIVE: The sensor is being warmed up or not activated.
A/F B1 S1 ACT (A/F Sensor, Active / Inactive)
This parameter indicates the activation condition of A/F sensor
ACTIVE: The sensor is activated.
INACTIVE: The sensor is being warmed up or not activated.