Scan Tool Data List

The "SCAN" data values, listed below, are typical for the test parameters of a TECH-1 or equivalent scan tool connected to the Data Link Connector (DLC) (formerly the ALDL) diagnostic connector, and under the following conditions:

Idle
Upper Radiator Hose Hot
Park or Neutral
Closed Throttle
Closed Loop
Accessories "OFF".

Many of the parameters show "data" rather than voltage or resistance values, and cannot be read using a volt/ohm meter.


SCAN POSITION UNITS DISPLAYED TYPICAL DATA VALUE

Engine Speed RPM +/- 100 RPM from desired RPM (+/- 50 in drive)
Desired Idle RPM ECM idle command (varies with temp.)
Engine Coolant Temp. °C/°F 85°C - 105°C (185°F - 221°F)
Intake Air Temp. °C/°F 10°C - 90° (50°F - 194°F)
MAP Volts/kPa 30 - 70 kPa/1.02 - 3.5 volts (varies with altitude)
Throttle Position Volts 0.3 - 1.0
Throttle Angle Percentage 0 %
S.T. Fuel Trim Counts Varies
L.T. Fuel Trim Counts 118 - 138
O2S Millivolts 1 - 1000 and varying
Loop Status Open/Closed Closed loop (may go open with extended idle)
Injector Pulse Width Milliseconds 1.0 - 1.5
Air Fuel Ratio Ratio 14.7 to 1
Fuel Trim Cell Cell # 0 - 4
Fuel Trim Enable Yes/No Varies
Knock Signal Yes/No No (Yes, when knock is detected)
Knock Retard Degrees 0
Spark Advance Degrees 15° (Varies)
Idle Air Control Counts 5 - 50
Park Neutral Position P-N-/-R-DL P-N-
Vehicle Speed km/h-MPH 0
A/C Monitor OK/Not OK OK
A/C Request Yes/No No
A/C Clutch ON/OFF OFF
Oil Life Monitor Percentage Varies
Fan 1 ON/OFF OFF
Fan 2 ON/OFF OFF
EGR Duty Cycle Percentage 0 %
Fuel EVAP Purge Percentage 0 %
Power Steering High Pressure/
Normal Normal
Air Pump System ON/OFF OFF
System Volts Voltage 13.5 - 14.5
Fuel Pump Volts Voltage 13.5 - 14.5
PASS-Key II Enabled / Disabled Enabled
QDM Fault Yes/No No
TCC 4th ON/OFF Yes/No OFF No
Calibration I.D. 0 - 9999 Varies
Time From Start Hrs/Min Varies