Scan Tool Data List
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
- Output Driver Status
- 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 Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| A/C High Side Pressure | 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 Relay - High Volts | Output Driver Status | Test Not Run/Test Pass | - |
| A/C Relay - Low Volts | Output Driver Status | Test Not Run/Test Pass | - |
| A/C Relay - Open | Output Driver Status | Test Not Run/Test Passed | - |
| A/C Request | General Info-Inputs, General Info-Outputs, Idle/Speed Control | Yes/No | No |
| Air Flow Calculated | Engineering/Fuel and Emissions | Grams/Sec | - |
| Air Fuel Ratio | Fuel and Emissions | Ratio | - |
| BARO | Fuel and Emissions | kPa | - |
| Brake Switch | General Info-Inputs, Idle/Speed Control | Applied/Released | - |
| Calc Converter Temp | Engineering | °C/°F | - |
| Clutch Pedal Switch | General Info Input | Released/Applied | - |
| CMP Resync Counter | General Info-Inputs, Ignition | Counts | - |
| Cooling Fan Relay CMD | General Info-Outputs, Output Driver Status | On/Off | 0=Off 1=ON |
| Cooling Fan Relay - High | Output Driver Status | Test Not Run/Test Passed | - |
| Cooling Fan Relay - Low | Output Driver Status | Test Not Run/Test Passed | - |
| Cooling Fan Relay - Open | Output Driver Status | Test Not Run/Test Passed | - |
| Crank Learned | Misfire | Yes | No |
| Cruise Brake Switch | General Info, Inputs, Idle/Speed Control | Released/Applied | - |
| Cruise Control Clutch - High Volts | Output Driver Status | Test Not Run/Test Passed | - |
| Cruise Control Clutch - Low Volts | Output Driver Status | Test Not Run/Test Passed | - |
| Cruise Control Clutch - Open | Output Driver Status | Test Not Run/Test Passed | - |
| Cruise Control Dir. Ckt - High Volts | Output Driver Status | Test Not Run/Test Passed | - |
| Cruise Control Dir. Ckt - Low Volts | Output Driver Status | Test Not Run/Test Passed | - |
| Cruise Control Dir. Ckt - Open | Output Driver Status | Test Not Run/Test Passed | - |
| Cruise Clutch Command | Idle/Speed Control, Output Driver Status | On/Off | 0=Off 1=ON |
| Cruise Delta | Idle/Speed Control | km/h/mph | - |
| Cruise Direction Command | Idle/Speed Control, Output Driver Status | No/Yes | - |
| Cruise Gear Out of Range | Idle/Speed Control | - | - |
| Cruise In Release State | Idle/Speed Control | Yes/No | 0=No 1=Yes |
| Cruise Move Ckt - High Volts | Output Driver Status | Test Not Run/Test Passed | - |
| Cruise Move Ckt - Low Volts | Output Driver Status | Test Not Run/Test Passed | - |
| Cruise Move Ckt - Open | Output Driver Status | Test Not Run/Test Passed | - |
| Cruise Move Command | Output Driver Status | On/Off | - |
| Cruise Off Brake | Idle/Speed Control | Off/On | - |
| Cruise Resume/Accel | General Info-Inputs, Idle/Speed Control | On/Off | 0=Off 1=ON |
| Cruise RPM Out of Range | Idle/Speed Control | Yes/No | - |
| Cruise Set/Coast | General Info-Inputs, Idle/Speed Control | On/Off | 0=Off 1=ON |
| Cruise Set Speed | Idle/Speed Control | km/h /mph | - |
| Cruise Switch | General Info-Inputs, Idle/Speed Control | On/Off | 0=Off 1=ON |
| Cruise Switch Voltage | Idle/Speed Control | Volts | - |
| Cruise Traction Active | Idle/Speed Control | Yes/No | - |
| Cruise Trans Range SW | Idle/Speed Control | Yes/No | - |
| Cruise Volt Out of Range | Idle/Speed Control | Yes/No | - |
| Cruise VSS Out of Range | Idle/Speed Control | - | - |
| Decel Fuel Off | Fuel and Emissions | Yes/No | - |
| Decel Rich Fault | Fuel and Emissions | Yes/No | - |
| Desired Idle Speed | Idle/Speed Control | RPM | - |
| Dist. Since Code Clear | Engineering | km/miles | - |
| ECT | General Info-Inputs, General Info-Outputs, Fuel and Emissions, Misfire, Auxiliary Emissions, Idle/Speed Control, Engineering | °C/°F | - |
| Engine LOAD | General Info-Inputs, General Info-Outputs, Fuel and Emissions, Misfire, Auxiliary Emissions, Idle/Speed Control, Engineering | % | - |
| Engine Oil Life Remaining | General Info-Inputs | % | - |
| Engine Oil Life Reset | General Info-Inputs | Yes/No | 0=No 1=Yes |
| Engine Run Time | General Info-Inputs, General Info-Outputs, Fuel and Emissions, Misfire, Auxiliary Emissions, Idle/Speed Control, Engineering | 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 Large Leak | Auxiliary Emissions | Not Ran/Pass/Fail | 0,0=Not Ran 1,0=Fail 0,1=Pass |
| EVAP Pressure Slope | Engineering | H2O/Sec | - |
| EVAP Purge - High Volts | Output Driver Status | Test Not Run/Test Passed | - |
| EVAP Purge - Low Volts | Output Driver Status | Test Not Run/Test Passed | - |
| EVAP Purge - Open | Output Driver Status | Test Not Run/Test Passed | - |
| EVAP Purge Solenoid | General Info-Outputs, Output Driver Status | On/Off | 0=Off 1=ON |
| EVAP Purge Solenoid DC | General Info-Outputs, Fuel and Emissions, Auxiliary Emissions | % | - |
| EVAP Purge Valve Leak | Auxiliary Emissions | Not Ran/Pass/Fail | 0,0=Not Ran 1,0=Fail 0,1=Pass |
| EVAP System Small Leak | Auxiliary Emissions | Not Ran/Pass/Fail | 0,0=Not Ran 1,0=Fail 0,1=Pass |
| EVAP Tank Vac. Filtered | Engineering | H2O/Sec | - |
| EVAP Tank Vac. Slope | Engineering | mm Hg/s /in H2O/s | - |
| EVAP Vent Blockage | Auxiliary Emissions | Not Ran/Pass/Fail | 0,0=Not Ran 1,0=Fail 0,1=Pass |
| EVAP Vent - High Volts | Output Driver Status | Test Not Run/Test Passed | - |
| EVAP Vent - Low Volts | Output Driver Status | Test Not Run/Test Passed | - |
| EVAP Vent - Open | Output Driver Status | Test Not Run/Test Passed | - |
| EVAP Vent Solenoid | General Info-Outputs, Output Driver Status | On/Off | - |
| Fuel Cutoff | Fuel and Emissions | On/Off | - |
| Fuel Level Sensor | Fuel and Emissions/Ignition | Volts | - |
| Fuel Level | General Info-Inputs/Ignition/Fuel and Emissions | % | - |
| Fuel Pump Relay - High Volts | Output Driver Status | Test Not Run/Test Passed | - |
| Fuel Pump Relay - Low Volts | Output Driver Status | Test Not Run/Test Passed | - |
| Fuel Pump Relay - Open | Output Driver Status | Test Not Run/Test Passed | - |
| Fuel Pump Relay Command | General Info-Outputs, Output Driver Status | On/Off | 0=Off 1=ON |
| Fuel Tank Pressure | General Info-Inputs, Auxiliary Emissions | mm Hg/in H2O | - |
| Fuel Tank Pressure Sensor | General Info-Inputs, Auxiliary Emissions | Volts | - |
| Fuel Trim Cell | Fuel and Emissions | Cell # | - |
| Generator F Terminal DC | General Info Inputs | % | - |
| Generator L Terminal | General Info Inputs | Disabled/Enabled | 0=Disabled 1=Enabled |
| High Spark Modifier | Ignition | Degree | - |
| HO2S 1, 2 Heater Command | Output Driver Status, General Info Inputs | On/Off | 0=Off 1=ON |
| 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 |
| HO2S 1, 2 Heater - High Volts | Output Driver Status | Test Not Run/Test Passed | - |
| HO2S 1, 2 Heater - Low Volts | Output Driver Status | Test Not Run/Test Passed | - |
| HO2S 1, 2 Heater - Open | Output Driver Status | Test Not Run/Test Passed | - |
| IAC Motor Ckt - High Volts | Output Driver Status | Test Pass/Fail | - |
| IAC Motor Command | Output Driver Status | On/Off | - |
| IAC Position | Idle/Speed Control | Counts | - |
| IAC Position with A/C | Engineering, Idle/Speed Control | Counts | - |
| IAC Position without A/C | Engineering, Idle/Speed Control | Counts | - |
| IAT | General Info-Inputs, General Info-Outputs, Fuel and Emissions, Misfire, Auxiliary Emissions, Idle/Speed Control, Engineering, Ignition | °C/°F | - |
| Ign. Coil 1 and 4 - Command | Output Driver Status | On/Off | - |
| Ign. Coil 1 and 4 - High Volts | Output Driver Status | Test Not Run/Test Passed | - |
| Ign. Coil 1 and 4 - Low Volts | Output Driver Status | Test Not Run/Test Passed | - |
| Ign. Coil 1 and 4 - Open | Output Driver Status | Test Not Run/Test Passed | - |
| Ign. Coil 2 and 3 - Command | Output Driver Status | On/Off | - |
| Ign. Coil 2 and 3 - High Volts | Output Driver Status | Test Not Run/Test Passed | - |
| Ign. Coil 2 and 3 - Low Volts | Output Driver Status | Test Not Run/Test Passed | - |
| Ign. Coil 2 and 3- Open | Output Driver Status | Test Not Run/Test Passed | - |
| Ignition 1 | General Info-Inputs, General Info-Outputs, Fuel and Emissions, Misfire, Auxiliary Emissions, Idle/Speed Control, Engineering | Volts | - |
| Injector PWM | Fuel and Emissions | Milliseconds (ms) | - |
| Injector 1-4 Command | Output Driver Status | On/Off | 0=Off 1=ON |
| Injector 1-4 - High Volts | Output Driver Status | Test Not Run/Test Passed | - |
| Injector 1-4 - Low Volts | Output Driver Status | Test Not Run/Test Passed | - |
| Injector 1-4 - Open | Output Driver Status | Test Not Run/Test Passed | - |
| KS Noise | Ignition | Counts | - |
| Knock Retard | Ignition | Degree | - |
| 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 Coolant Level | General Info-Inputs, Idle/Speed Control | Yes/No | - |
| Low Oil Pressure | General Information | 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 | - |
| MIL Command | Output Driver Status | On/Off | 0=Off 1=ON |
| M/T Clutch Disengaged | Idle/Speed Control | Yes/No | - |
| Mid Spark Modifier | Ignition | Degree | - |
| MIL High Volts | Output Driver Status | Test Not Run/Test Pass | - |
| MIL Low Volts | Output Driver Status | Test Not Run/Test Pass | - |
| MIL Open | Output Driver Status | Test Not Run/Test Status | - |
| Misfire Current #1-4 | Misfire | Counts | - |
| Misfire Enabled | Misfire | Yes/No | 0=No 1=Yes |
| Misfire History #1-4 | Misfire | Counts | - |
| O2S 1 | General Info-Inputs, Fuel and Emissions, Auxiliary Emissions | Millivolts | - |
| O2S Transition Time Ratio | Engineering | Ratio | - |
| Park Brake Switch | Idle/Speed Control | Off/On | - |
| 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 | % | - |
| Spark | Ignition | Degree (BTDC) | - |
| Starter Relay Command | Output Driver Status | On/Off | - |
| Starter Relay-High Volts | Output Driver Status | Test Pass/Test Not Run | - |
| Starter Relay- Low Volts | Output Driver Status | Test Pass/Test Fail | |
| Starter Relay-Open | Output Driver Status | Test Pass/Test Fail | - |
| Start Up ECT | Fuel and Emissions | °C/°F | - |
| Steering Assist Sol. DC | General Info-Inputs | % | - |
| Steering Sol. Command | Output Driver Status | - | - |
| Steering Solenoid - High Volts | Output Driver Status | - | - |
| Steering Solenoid - Low Volts | Output Driver Status | - | - |
| Steering Solenoid - Open | Output Driver Status | - | - |
| System Power Mode | General Info Inputs | Run/Off | - |
| 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 | % | - |
| Vehicle Speed | General Info-Inputs, General Info-Outputs, Fuel and Emissions, Misfire, Auxiliary Emissions, Idle/Speed Control, Engineering, Ignition | km/h / mph | Varies |
| VTD Fail Enable | Engineering | On/Off | - |
| VTD Fuel Cutoff | - | Yes/No | 0=No 1=Yes |
| VTD Fuel Disable | Engineering | Active/Inactive | - |