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 the order shown on the scan tool.

Use the Engine Scan Tool Data List only after performing the following inspections:

• | Powertrain On-Board Diagnostic System Check is completed.

• | No diagnostic trouble codes (DTCs) are present.

• | On-board diagnostics are functioning properly.

Use the scan tool data values from a properly running engine for comparison with the engine that is being diagnosed. The Engine Scan Tool Data List represents values that would be seen on a properly running engine.

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

The scan tool data parameters listed below are the only parameters referenced in this service manual for use in diagnosis. If all scan tool data values are within the typical ranges described below, refer to Symptoms for additional diagnosis.

Scan Tool Parameter | Data List | Units Displayed | Typical Data Value
--- | --- | --- | ---
Engine Idling/Upper Radiator Hose Hot/Closed Throttle/Park or Neutral/Closed Loop
Engine Speed | Engine Data | RPM | 700 - 800 RPM
Desired Idle Speed | Engine Data | RPM | 750 RPM
ECT | Engine Data | °C (°F) | 80°C to 100°C (176°F to 212°F)
IAT | Engine Data | °C (°F) | Varies with underhood and ambient air temperatures
Engine Load | Engine Data | % | 3-6%
MAP | Engine Data | kPa | 28 to 47 kPa
MAP | Engine Data | Volts | 1.32-1.90 Volts (varies with vacuum and barometer and altitude)
BARO | Engine Data | kPa | 89 to 99 kPa (varies with vacuum and barometer and altitude)
TP Sensor | Engine Data | Volts | 0.42-1.00 Volts
TP Angle | Engine Data | % | 7 to 18%
IAC Duty Cycle | Engine Data | % | 8-35%
Closed Throttle Switch | Engine Data | Idle/Not Idle | Idle
HO2S 1 | Engine Data | mV | 50 to 950 mV (varies)
HO2S 2 | Engine Data | mV | 50 to 950 mV (varies)
Loop Status | Engine Data | Open/Closed Loop | Closed Loop
HO2S 1 Ready | Engine Data | Yes/No | Yes
HO2S 2 Ready | Engine Data | Yes/No | varies
Short Term FT | Engine Data | % | -20 to +20% (varies()
Short Term FT | Engine Data | Counts | 128 Counts (varies)
Long Term FT | Engine Data | % | -15 to +15% (varies)
Long Term FT | Engine Data | Counts | 128 Counts (varies)
Total Fuel Trim | Engine Data | % | -35% to +35% (varies)
Injector PWM | Engine Data | ms | 2-4 ms
Fuel Cutoff Signal | Engine Data | Yes/No | No
Spark | Engine Data | ° | 9° to 15°
Spark Advance Adjust Test Switch | Engine Data | On/Off | Off
EVAP Duty Cycle | Engine Data | % | 0-100%
EVAP Vent Solenoid | Engine Data | On/Off | Off (solenoid is OFF with engine coolant temp. below 80°C)
EVAP Density Trim | Engine Data | Counts | 0 to 14 Counts (varies)
Fuel Level | Engine Data | % | Varies with the amount of fuel in the tank (90% with a full tank)
Fuel Tank Pressure | Engine Data | mmHg/in H2O | 0.0 mmHg (with fuel filler cap removed)
EVAP Tank Pressure Control Solenoid | Engine Data | On/Off | varies
Air Conditioning | Engine Data | On/Off | Off
Engine Coolant Fan | Engine Data | On/Off | Varies with engine coolant temperature
Fuel Pump | Engine Data | On/Off | On
Power Steering Switch | Engine Data | On/Off | Off (with steering wheel straight ahead)
Starter Switch | Engine Data | Released/Cranking | Released
Battery Voltage | Engine Data | Volts | 12-14 Volts
Electrical Load Signal | Engine Data | Yes/No | No (with all of the electrical accessories turned Off)
PNP (A/T Only) | Engine Data | P-N/R-D-L | P-N
Vehicle Speed | Engine Data | km/h / MPH | 0 km/h / 0 MPH