For 1990-2009 cars

The engine Scan Tool Data List contains all engine related parameters that are available on the scan tool. The list is arranged in alphabetical order. The parameters in the Typical Scan Data values column represent values that would be seen on a normally running engine.

Important:: A scan tool that displays faulty data should not be used, and the problem should be reported to the scan tool manufacturer. Use of a faulty scan tool can result in misdiagnosis and unnecessary parts replacement.

Only the parameters listed below are referred to in this service manual for use in diagnosis. For further information on using the scan tool to diagnose the ECM and related sensors, refer to the applicable reference section listed below. If all values are within the typical range described below, refer to Symptoms - Engine Controls . The Typical Scan Data Values table contains all the parameters included in the following data lists arranged in alphabetical order:

• | General Info--Inputs

• | General Info--Outputs

• | Fuel and Emissions

• | Ignition

• | Misfire

• | Auxiliary Emissions

• | Idle/Speed Control

• | Engineering

For scan tool parameter definitions, refer to Scan Tool Data Definitions .

Important: Use the Typical Scan Data Values only after the following conditions are met:

• | The Diagnostic System Check - Engine Controls has been completed.

• | The engine is idling unless checking a value at a specified RPM.

• | The throttle is closed unless checking a value at a specified RPM.

• | The vehicle is in PARK or NEUTRAL.

• | The vehicle is operating in Closed Loop.

• | The vehicle accessories are turned OFF.

Scan Tool Parameter | Data List | Units Displayed | Typical Data Value
--- | --- | --- | ---
AC Relay CKT Short to Ground | General Info-Outputs | Yes/No | Yes
AC Relay CKT Short to Voltage | General Info-Outputs | Yes/No | No
A/C High Side Pressure | General Info-Outputs, General Info-Inputs | Volts | --
A/C Relay Command | General Info-Inputs, General Info-Outputs, Idle/Speed Control, Output Driver Status | On/Off | Off unless commanded On
A/C Request | General Info-Inputs, General Info-Outputs, Idle/Speed Control | Yes/No | No
Air Flow | Engineering | Grams/Sec | --
Air Fuel Ratio | Fuel and Emissions | Ratio | --
Air Pump Rel. CKT Open or Short to Ground | General Info-Outputs | Yes/No | No
Air Pump Rel. CKT Short to Voltage | General Info-Outputs | Yes/No | No
Air Pump Relay Commanded | General Info-Outputs | On/Off | Off
AIR Pump Relay Command | Auxiliary Emissions | On/Off | --
BARO | Fuel and Emissions | kPa | --
CAL. Compression Output | Misfire | Counts | --
Calc Converter Temp | Engineering | °C/°F | --
CKP Active Counter | General Info-Inputs, Ignition | Counts | --
CMP Active Counter | General Info-Inputs, Ignition | Counts | --
CMP Resync Counter | General Info-Inputs, Ignition | Counts | --
Cooling Fan Relay CMD | General Info-Outputs, Output Driver Status | On/Off | 0=Off 1=ON
Cruise Brake Switch/ Clutch Switch | General Info, Inputs, Idle/Speed Control | Released/Applied | --
Cruise Engaged | General Info-Inputs, | Yes/No | No
Cruise Engaged | Idle/Speed Control | On/Off | --
Current IAC Memory | Engineering | Counts | --
Decel Fuel Cut-Off | Fuel and Emissions | Yes/No | --
Desired Idle Speed | Idle/Speed Control | RPM | --
ECT | General Info-Inputs, General Info-Outputs, Fuel and Emissions, Misfire, Auxiliary Emissions, Idle/Speed Control, Engineering, Ignition | °C/°F | --
Engine LOAD | General Info-Inputs, General Info-Outputs, Fuel and Emissions, Misfire, Auxiliary Emissions, Idle/Speed Control, Engineering, Ignition | % | --
Engine Oil Life Remaining | General Info-Inputs | % | --
Engine Run Time | General Info-Inputs, General Info-Outputs, Fuel and Emissions, Misfire, Auxiliary Emissions, Idle/Speed Control, Engineering, Ignition | H:MM:SS | --
Engine Speed | General Info-Inputs, General Info-Outputs, Fuel and Emissions, Misfire, Auxiliary Emissions, Idle/Speed Control, Engineering, Ignition | RPM | Varies
EVAP Purge CKT Open or Short to Ground | General Info-Outputs | Yes/No | No
EVAP Purge CKT Short to Voltage | General Info-Outputs | Yes/No | No
EVAP Purge Solenoid DC | General Info-Outputs, Fuel and Emissions, Auxiliary Emissions | % | --
EVAP Tank Vac. Slope | Engineering | mm Hg/in H2O | --
EVAP Vent CKT Open or Short to Ground | General Info-Outputs | Yes/No | No
EVAP Vent CKT Short to Voltage | General Info-Outputs | Yes/No | No
EVAP Vent Solenoid | General Info-Outputs, Auxiliary Emissions | On/Off | --
FC 1 Relay CKT Open or Short to Ground | General Info-Outputs | Yes/No | No
FC 1 Relay CKT Short to Voltage | General Info-Outputs | Yes/No | No
FC 2 Relay CKT Open or Short to Ground | General Info-Outputs | Yes/No | No
FC 2 Relay CKT Short to Voltage | General Info-Outputs | Yes/No | No
Fan Control 1 Command | General Info-Outputs | On/Off | Off
Fan Control 2 Command | General Info-Outputs | On/Off | Off
Fuel Level | General Info-Inputs/Ignition/Fuel and Emissions | % | --
Fuel Tank Pressure | General Info-Inputs | mm Hg/in H2O | --
Fuel Tank Pressure Sensor | General Info-Inputs, Auxiliary Emissions | Volts | --
Fuel Trim Cell | Fuel and Emissions | Cell # | --
Fuel Trim Index | Fuel and Emissions | % | --
Generator F Terminal DC | General Info Outputs | % | --
Generator L Terminal | General Info Outputs | Disabled/Enabled | 0=Disabled 1=Enabled
HO2S 1, 2 | General Info-Inputs, Fuel and Emissions, Auxiliary Emissions | mV | 0-1,000 mV and varying
HO2S 1, 2 Heater Current | Auxiliary Emissions, General Info, Fuel and Emissions | Amps | 0.5-0.6 Amps
IAT | General Info-Inputs, General Info-Outputs, Fuel and Emissions, Misfire, Auxiliary Emissions, Idle/Speed Control, Engineering, Ignition | °C/°F | --
Ignition 1 | General Info-Inputs, General Info-Outputs, Fuel and Emissions, Misfire, Auxiliary Emissions, Idle/Speed Control, Engineering, Ignition | Volts | --
Injector PWM | Fuel and Emissions | Milliseconds (ms) | --
KS Active Counter | Ignition | Counts | --
Knock Retard | Ignition | Degree | --
Knock Sensor 1 | General Info-Inputs, Ignition | Volts | --
Lean/Rich Avg. Time | Engineering | Milliseconds (ms) | --
Lean/Rich Transitions | Engineering | Counts | --
Long Term FT | Fuel and Emissions, Auxiliary Emissions, Ignition | % | --
Loop Status | Fuel and Emissions | Open/On | 0=Open 1=ON
Low Oil Pressure | General Info Inputs | No/Yes | --
Low Spark Modifier | Ignition | Degree | --
MAP | General Info-Inputs, General Info-Outputs, Fuel and Emissions, Misfire, Auxiliary Emissions, Idle/Speed Control, Engineering, Ignition | kPa | --
MAP Sensor | General Info-Inputs | Volts | --
Misfire Current #1-4 | Misfire | Counts | --
Misfire History #1-4 | Misfire | Counts | --
Module Driver Overtemp | General Info-Outputs | Yes/No | No
Module Driver Overvoltage | General Info-Outputs | Yes/No | No
Park/Neutral Switch | Idle/Speed Control | R, D, L, P, N | 0=R, D, L 1=P, N
Power Enrichments | Fuel and Emissions | Inactive/Active | --
Rich/Lean Avg. Time | Engineering | Milliseconds (ms) | --
Rich/Lean Transitions | Engineering | Counts | --
Seed and Key Timer | Engineering | Seconds | --
Short Term FT | Fuel and Emissions, Auxiliary Emissions, Ignition, General Info-Inputs | % | --
Spark | Ignition | Degree (BTDC) | --
Start Up ECT | Fuel and Emissions | °C/°F | --
TP Sensor | General Info-Inputs, Idle/Speed Control | Volts | --
TP Angle | General Info-Inputs, General Info-Outputs, Fuel and Emissions, Misfire, Auxiliary Emissions, Idle/Speed Control, Engineering, Ignition | % | --
Total Misfire Count | Misfire | Counts | --
Vehicle Speed | General Info-Inputs, General Info-Outputs, Fuel and Emissions, Misfire, Auxiliary Emissions, Idle/Speed Control, Engineering, Ignition | km/h / mph | Varies