1. 1A
Scan Tool Data
ECM
As 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, judgment
as abnormal should not be made depending on these data alone.
Also, conditions that can be checked by the 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. Refer to Ignition Timing
Inspection.
NOTE:
When checking the data with the engine running at idle or racing, be
sure to place gear shift lever in “Neutral” and apply the parking brake
fully.
Scan tool data Vehicle condition Normal condition / reference
value
Fuel System
Open-loop control before satisfaction of
closed-loop control conditions (ECT >
20 °C, HO2S, IAT, TP sensor/system =
OK)
OL (open-loop)
Open-loop control due to driving
conditions (Power enrichment, etc.)
OL-Drive (open-loop)
Open-loop control due to system fault
detected
OL-Fault (open-loop)
Closed-loop control using HO2S as
feedback sensor for fuel control
CL (closed-loop)
Closed-loop control due to system fault
detected
CL-Fault (closed-loop)
When engine stops with ignition “ON” —
Short Term Fuel
Trim
Specified idle speed for 2 min. after
warm-up
Approx. –20 to 20%
Long Term Fuel
Trim
Specified idle speed for 2 min. after
warm-up
Approx. –20 to 20%
Total Fuel Trim
Specified idle speed for 2 min. after
warm-up
Approx. –30 to 30%
Inj Pulse Width
Specified idle speed with no load after
warm-up
Approx. 1.5 to 4.5 msec
Ignition
Advance
Specified idle speed with no load after
warm-up
5 ± 5° BTDC
Ignition timing: Fix (using “Fixed
Spark” of “Engine / Active Test” mode
on scan tool)
5° BTDC
Calculated Load
Specified idle speed with no load after
warm-up
Approx. 15 to 40%
Engine Speed •Engine condition: Specified idle speed Approx. 850 to 950 rpm

2. after warm-up
•Radiator cooling fan: Stopped
•All electrical parts: OFF
•Shift lever: Neutral position
Desired Idle
•Engine condition: Specified idle speed
after warm-up
•Radiator cooling fan: Stopped
•All electrical parts: OFF
•Shift lever: Neutral position
Approx. 900 rpm
Vehicle Speed
Vehicle running The same value as speedometer
MAP
Specified idle speed with no load after
warm-up
Approx. 20 to 45 kPa
ECT Specified idle speed after warm-up
Approx. 80 to 100 °C (176 to
212 °F)
Intake Air
Temperature
Specified idle speed after warm-up
–5 °C (23 °F) + environmental
temperature to 40 °C (104 °F) +
environmental temperature
Barometric Pres
—
Barometric pressure is
displayed.
EVAP Canist Prg
Duty
Specified idle speed after warm-up 0%
IAC Flow Duty
Specified idle speed with no load after
warm-up
Approx. 5 to 40%
•Engine condition: Specified idle speed
after warm-up
•A/C switch: ON
•Blower fan switch: 3rd position
Approx. 10 to 50%
TP Sensor1 Volt
•Engine condition: Stopped
•Accelerator pedal: Released 0.6 to 1.0 V
•Engine condition: Stopped
•Accelerator pedal: Depressed fully 3.7 to 4.2 V
Throttle Position
•Engine condition: Stopped
•Accelerator pedal: Released Approx. 0%
•Engine condition: Stopped
•Accelerator pedal: Depressed fully 90 to 100%
O2S B1 S1
2,000 rpm for 3 min. or more after
warm-up
Approx. 0 to 1.0 V
Battery Voltage
Specified idle speed Approx. 12 to 15 V
Fuel Tank Level
Ignition switch: ON 0 to 100%
Radiator Fan
Radiator cooling fan: ON ON
Other than above condition OFF
A/C Comp Relay
A/C switch and blower motor switch
turned ON
ON
Other than above condition OFF
Fuel Pump
Engine running ON
Other than above condition OFF

3. Starter SW
Ignition switch: ST position (engine
cranking)
ON
Other than above condition OFF
A/C Switch
A/C switch: ON ON
Other than above condition OFF
Blower Fan
Blower fan switch: 2nd or higher
position
ON
Other than above condition OFF
Brake Switch
Brake pedal: Depressed fully ON
Brake pedal: Released OFF
Electric Load 1
Position light: ON ON
Position light: OFF OFF
Electric Load 2
Rear defogger: ON ON
Rear defogger: OFF OFF
Fuel Cut
Specified idle speed after warm-up OFF
•Accelerator pedal: Released
•Engine condition: 2,000 rpm or more
ON
after warm-up
Closed Throttle
Pos
•Engine condition: Stopped
•Accelerator pedal: Released ON
•Engine condition: Stopped
•Accelerator pedal: Depressed fully OFF
O2S B1 S1 Act
Specified idle speed after warm-up Active
Scan Tool Data Definitions
Fuel System (Fuel System Status)
This parameter indicates A/F ratio feedback loop. Refer to “Scan Tool Data”
Short Term Fuel Trim (%)
This parameter indicates the short term corrections of the air / fuel mixture
computation.
0%: No correction
Above 0%: Enrichment correction
Below 0%: Lean mixture correction
Long Term Fuel Trim (%)
This parameter indicates the long term corrections of the air / fuel mixture
computation.
0%: No correction
Above 0%: Enrichment correction
Below 0%: Lean mixture correction
Total Fuel Trim (%)
This parameter indicates the calculated total fuel trim value based on values of
short term fuel trim and long term fuel trim.
0%: No correction
Above 0%: Enrichment correction
Below 0%: Lean mixture correction
Inj Pulse Width (Fuel Injection Pulse Width, msec)

4. This parameter indicates the 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)
This parameter indicates the ignition timing of No.1 cylinder commanded by ECM.
The actual ignition timing should be checked using the timing light.
Calculated Load (Calculated Load Value, %)
This parameter indicates the percentage of engine load calculated based on input
signal to ECM from various engine sensors.
Engine Speed (rpm)
This parameter indicates the calculated engine speed based on reference pulses
from the camshaft position sensor.
Desired Idle (Desired Idle Speed, rpm)
This parameter indicates the ECM internal parameter which indicates the idle speed
requested by ECM. If the engine is not running, this number is not valid.
Vehicle Speed (km/h, MPH)
This parameter indicates the calculated vehicle speed based on vehicle speed
sensor signal.
MAP (Manifold Absolute Pressure, kPa, inHg, inH2O, mmHg, psi)
This parameter indicates the calculated manifold pressure based on MAP sensor
signal.
ECT (Engine Coolant Temperature, °C, °F)
This parameter indicates the calculated engine coolant temperature based on ECT
sensor signal.
Intake Air Temperature (°C, °F)
This parameter indicates the calculated intake air temperature based on IAT sensor
signal.
Barometric Pres (Barometric Pressure, kPa, inHg, inH2O, mmHg,
psi)
This parameter indicates the calculated barometric air pressure based on MAP
sensor signal.
EVAP Canist Prg Duty (EVAP Canister Purge Flow Duty, %)
This parameter indicates the calculated opening rate of EVAP canister purge valve
based on control signal of EVAP canister purge valve.
0%: EVAP canister purge valve is fully closed
100%: EVAP canister purge valve is fully opened
IAC Flow Duty (Idle Air Control Flow Duty, %)
This parameter indicates the calculated opening rate of ISC valve based on ISC
valve control signal.
0%: Minimum idle air flow
100%: Maximum idle air flow
TP Sensor1 Volt (TP Sensor Output Voltage, V)
This parameter indicates the signal voltage of throttle position sensor.

5. Throttle Position (Absolute Throttle Position, %)
This parameter indicates the calculated opening percentage of throttle valve based
on signal voltage of throttle position sensor.
0 – 5%: Throttle valve position is fully closed
90 – 100%: Throttle valve position is fully opened
O2S B1 S1 (HO2S, V)
This parameter indicates the output voltage of HO2S installed on exhaust manifold
(pre-TWC).
Battery Voltage (V)
This parameter indicates battery voltage input 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%.
Radiator Fan (Radiator Cooling Fan Relay, ON / OFF)
This parameter indicates the state of radiator cooling fan relay.
ON: ON command being output to radiator cooling fan relay
OFF: No command being output
A/C Comp Relay (A/C Compressor Relay, ON / OFF)
This parameter indicates the state of A/C compressor relay.
ON: ON command being output to A/C compressor relay
OFF: No command being output
Fuel Pump (Fuel Pump Relay, ON / OFF)
This parameter indicates the state of fuel pump relay.
ON: ON command being output to fuel pump relay
OFF: No command being output
Starter SW (Starter Switch, ON / OFF)
This parameter indicates the state of starting motor relay.
ON: Starting motor relay is ON
OFF: Starting motor relay is OFF
A/C Switch (ON / OFF)
This parameter indicates the state of A/C switch.
ON: A/C switch is ON
OFF: A/C switch is OFF
Blower Fan (ON / OFF)
This parameter indicates the state of the blower fan motor switch.
ON: Blower fan is ON
OFF: Blower fan is OFF
Brake Switch (ON / OFF)
This parameter indicates the state of the brake switch.
ON: Brake pedal is depressed position
OFF: Brake pedal is released position
Electric Load 1 (ON / OFF)
This parameter indicates the state of electrical load.
ON: Headlight or small light ON signal input
OFF: Above electric loads all turned OFF

6. Electric Load 2 (ON / OFF)
This parameter indicates the state of rear defogger.
ON: Rear defogger is ON
OFF: Rear defogger is OFF
Fuel Cut (ON / OFF)
This parameter indicates the state of fuel cut control.
ON: Fuel injection being cut (output signal to injector is stopped)
OFF: Fuel injection not being cut
Closed Throttle Pos (Closed Throttle Position, ON / OFF)
This parameter indicates the state of throttle valve position.
ON: Throttle valve position is idle position (fully closed)
OFF: Throttle valve position is opened position
O2S B1 S1 ACT (HO2S, Active / Inactive)
This parameter indicates the activation condition of HO2S.
Active: The sensor is activated
Inactive: The sensor is warmed up or not active