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. A parameter may appear in any one of the data lists, and in some cases may appear more than once, or in more than one data list in order to group certain related parameters together.

Use the Engine Scan Tool Data List only after the following conditions are determined:

• | The Diagnostic System Check - Engine Controls is completed.

• | There are no diagnostic trouble codes (DTCs).

• | The on-board diagnostics are functioning correctly.

Scan tool values from an engine that is operating correctly may be used for comparison with the engine you are diagnosing. The Engine Scan Tool Data List represents the values that would be seen on a normal operating engine.

Important: Do not use a scan tool that displays faulty data. The scan tool concern should be reported to the manufacturer. Use of a faulty scan tool may result in misdiagnosis and unnecessary parts replacement.

Only the parameters listed below are referenced in this service information for use in diagnosis. If all values are within the typical range described below, refer to Symptoms - Engine Controls for diagnosis.

The column labeled Data List indicates where a parameter is located on the scan tool. Review the scan tool operating manual for the exact locations of the data lists. The following is a description of each term listed:

All: The Parameter is in all data lists indicated below.
Eng: Engine Data
EGR: EGR Data
EVAP: EVAP Data
FT: Fuel Trim Data
HO2S: O2S/HO2S Data
MF: Misfire Data
CH: Cooling/HVAC Data
IPC: IPC Data
FF: Freeze Frame Data
FR: Failure Records Data

#### Scan Tool Data List

Scan Tool Parameter | Data List | Parameter Range/Units | Typical Data Values
--- | --- | --- | ---
Engine Idling/Radiator Hose Hot/Park or Neutral/Closed Loop/Accessories Off
5 Volt Reference 1 | EGR, EVAP, CH | 0-5 Volts | 5.0 Volts
A/C High Side Pressure Sensor | CH | 0-5 Volts | Varies
A/C High Side Pressure Sensor | CH | kPa/psi | Varies
A/C Relay Command | Eng, EGR, MF, CH | On/Off | Off
A/C Request Signal | CH | Yes/No | No
Air Flow Calculated | Eng , FT, HO2S, MF, FF, FR | g/s | 3-6 g/s
Air Fuel Ratio | Eng, FT, HO2S, FF, FR | Ratio | 14.7:1
BARO | Eng , EGR, EVAP, HO2S, FT, FF, FR, MF | 65-104 kPa | Varies with altitude
Catalytic Converter Protection Active | HO2S, FT, MF | Yes/No | No
CMP Active Counter | Eng, MF | 1-3 Counts | Varies
Coolant Hot Lamp (If Equipped) | IPC | On/Off | Off
Decel. Fuel Cutoff | EGR, FT, HO2S | Active/Inactive | Inactive
Desired EGR Position | EGR | % | Varies
Desired IAC Position | Eng | Counts | Varies
Desired Idle Speed | Eng, EVAP, FF, FR | 0-7,000 RPM | 800-950 RPM
ECT Sensor | Eng , EGR, EVAP, FT, HO2S, MF, CH, IPC, FF, FR | -39°C to +140°C (-38°F to +284°F) | Varies
EGR Flow Test Count | EGR | Counts | Varies
EGR Learned Minimum | EGR | Volts | Varies
EGR Position Sensor | Eng, EGR, FT, MF | % | Varies
EGR Position Sensor | EGR | Volts | Varies
EGR Position Variance | EGR | Counts | Varies
EGR Solenoid Command | EGR | % | Varies
Engine Load | Eng , EGR, EVAP, FT, HO2S, MF, CH, FF, FR | 0-99% | 25-40% - Idle 25-40% - 2500 RPM
Engine Run Time | ALL | 0:00:00 | Varies
Engine Speed | ALL | RPM | 750-950 RPM
EVAP Purge Solenoid Command (If Equipped) | Eng, EVAP, FT, HO2S | 0-100% | Varies
EVAP Vent Solenoid Command (If Equipped) | Eng, EVAP | Venting/Not Venting | Venting
Fail Counter | FF, FR | Counts | Varies
Fans High Speed | CH | ON/OFF | Varies
Fans Low Speed | CH | ON/OFF | Varies
Fuel Level to Cluster | EVAP, IPC | % | Varies
Fuel Level Sensor | Eng, EVAP, FT, IPC | 0-5 Volts | Varies
Fuel Level Sensor | Eng, EVAP, FT, IPC | % | Varies
Fuel Pump Relay Command | Eng, FT | On/Off | On
Fuel Tank Pressure Sensor (If Equipped) | Eng, EVAP | in H2O/mm Hg | Varies
Fuel Tank Pressure Sensor (If Equipped) | Eng, EVAP, FF, FR | 0-5 Volts | Varies
Fuel Trim Cell | Eng, FT, FF, FR | Cell Number | Varies
Fuel Trim Learn | Eng, FT, FF, FR | Enabled/Disabled | Enabled
O2S/HO2S 1 | Eng, EVAP, FT, HO2S, FF, FR | 0-1,006 mV | Varies 400-800 mV
O2S/HO2S 1 Ready | HO2S | Yes/No | Yes
O2S/HO2S 2 | Eng, EVAP, FT, HO2S, FF, FR | 0-1,006 mV | Varies 400-800 mV
IAC Position | Eng, EGR, FT, HO2S, CH, FF, FR | Counts | 15-40 Counts
IAT Sensor | Eng, EGR, EVAP, FT, HO2S, MF, CH, FF, FR | -39° to +140°C (-38° to +284°F) | Varies
Ignition 1 Signal | Eng, EGR, EVAP, FT, HO2S, MF, CH, IPC | Volts | 12.0-14.5 Volts
IMT Valve Command (If Equipped) | Eng | On/Off | Off
Injector PWM | Eng, FT, HO2S, MF, FF, FR | 0-9 ms | 4.6-5.4 ms
Knock Retard | Eng, EGR, CH | Degrees | Varies
KS Active Counter | Eng | Counts | Varies
Long Term FT | Eng, EVAP, FT, HO2S, FT, FF, FR | -100% to +100% | 0%
Long Term FT Avg. | FT | -100% to +100% | 0%
Loop Status | Eng, EVAP, FT, HO2S, FF, FR | Open Loop/Closed Loop | Closed Loop
Low Fuel Lamp Command (If Equipped) | IPC | On/Off | Off
MAP Sensor | Eng, EGR, EVAP, FT, HO2S, MF, FF, FR | kPa | 38-50 kPa Varies with Altitude
MAP Sensor | Eng, MF, FF, FR | 0-5 Volts | 0.9-1.7 Volts
MIL Command | Eng, IPC | On/Off | Off
Mileage Since First Failure | FF, FR | km - miles | Varies
Mileage Since Last Failure | FF, FR | km - miles | Varies
Misfire Current Cyl. 1-4 | MF | 0-255 Counts | 0
Misfire History Cyl. 1-4 | MF | 0-65,535 Counts | 0
Not Run Counter | FF, FR | Counts | Varies
Pass Counter | FF, FR | Counts | Varies
PNP Switch | Eng, EGR, IPC | Park/Neutral/In Gear | Park/Neutral
Power Enrichment | FT, HO2S, MF, FF, FR | Active/Inactive | Inactive
Power Steering Switch (If Equipped) | Eng, CH | High Pressure/Normal Pressure | Normal Pressure
Rich/Lean to Lean/Rich Ratio Sensor 1 | FT, HO2S | Counts | Varies
Rich/Lean Transition Sensor 1 | FT, HO2S | Counts | Varies
Rough Road Sensor (If Equipped) | MF | 0-5 Volts | 2-3 Volts
Short Term FT Avg. | FT | -25% to +25% | -3% to +3%
Short Term FT | Eng, EVAP, FT, HO2S, FF, FR | -25% to +25% | -3% to +3%
Spark | Eng, FT, HO2S, MF, CH | -20 to +40 Degrees | 2-10 Degrees
Start Up ECT | EVAP, HO2S, CH, FF, FR | -39° to +140°C (-38° to +284°F) | Varies
Start Up IAT | EVAP, HO2S, CH, FF, FR | -39° to +140°C (-38° to +284°F) | Varies
SVS Lamp Command (If Equipped) | IPC | On/Off | Off
TCC Enable Solenoid Command (If Equipped) | Eng, MF | On/Off | Off
Total Fuel Trim Average | EVAP, FT, HO2S | -100 to +100% | Varies
Total Misfire | MF | Counts | 0
TP Sensor | Eng, EGR, EVAP, FT, HO2S, MF, FF, FR | 0-5 Volts | 0.0-0.3 Volts
TP Sensor | Eng, EGR, EVAP, FT, HO2S, MF, FF, FR | % | 5-15 %
TWC Temperature Calculated | MF | Temperature | Varies
Vehicle Security Status (If Equipped) | Eng, IPC | Enabled/Disabled | Disabled
Vehicle Speed Sensor | Eng, EGR, EVAP, FT, HO2S, MF, CH, IPC, FF, FR | Km/h mph | 0 km/h (0 mph)