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 powertrain control module (PCM) 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 in engine controls section for diagnosis. The Typical Scan Data Values table contains all the parameters included in the following data lists arranged in alphabetical order:

• | Engine Data 1--Contains general information regarding fuel delivery and basic engine operating conditions.

• | Engine Data 2--Contains general information regarding air conditioning (A/C), crankshaft position (CKP), camshaft position (CMP), knock sensor (KS), and basic engine operating conditions.

• | Engine Data 3--Contains general information regarding fuel delivery, engine coolant temperature (ECT), idle air temperature (IAT), vehicle theft deterrent (VTD), and basic engine operating conditions.

• | Evaporative Emission (EVAP) Data--Contains information specific to the evaporative emissions (EVAP) control system. Also displays parameters required to verify proper EVAP system operation.

• | Fuel Trim Data--Contains specific information regarding fuel trim.

• | Misfire Data--Contains specific information regarding misfire diagnostics and parameters required to verify proper operation with regard to misfire.

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.

#### Typical Scan Tool Data List

Scan Tool Parameter | Data List | Units Displayed | Typical Data Value
--- | --- | --- | ---
A/C High Side Pressure | Engine 2 | Volts | 0-5.0 Volts
A/C High Side Pressure | Engine 2 | kPa/psi | 0-3100 kPa/0-450 psi (varies with the refrigerant pressure)
Another TWC Test Desired | Fuel Trim | Yes/No | No
A/C Relay Command | Engine 1 Engine 2 Engine 3 Misfire | ON/OFF | OFF (ON with the A/C requested)
A/C Request Signal | Engine 2 | Yes/No | No (Yes with A/C ON)
Air Flow Calculated | Engine 1 Engine 2 Engine 3 Fuel Trim Misfire | g/s | Varies
Air/Fuel Ratio | Engine 2 Engine 3 Fuel Trim | Ratio | 14.6:1 (varies)
BARO | Engine 1 EVAP Fuel Trim | kPa | 65-104 (varies with the altitude and barometric pressure).
CKP Active Counter (7X Reference) | Engine 2 | 0-255 Counts | 0-255--Increments while cranking or running
CMP Active Counter | Engine 2 | 0-255 Counts | 0-255--Increments while cranking or running
CMP Resync Counter | Engine 2 | 0-255 Counts | 0
Cruise Control Active | Engine 1 Engine 2 Engine 3 | Yes/No | No
Cruise Release Clutch / TCC Pedal Switch | Engine 1 Engine 2 Engine 3 | Applied/Unapplied | Unapplied
Current Gear | Engine 1 Engine 2 Fuel Trim | 1-6 | 6
Cycles of Misfire Data | Misfire | Counts | 0-99 (varies)
Desired Idle Speed | Engine 1 Engine 2 Engine 3 EVAP | RPM | PCM commanded idle speed (varies with calibration).
ECT Sensor | Engine 1 Engine 2 Engine 3 EVAP Fuel Trim

Misfire

°C-°F

85°C-115°C/185°F-239°F (varies with coolant temperature).

Engine Load | Engine 1 Engine 2 Engine 3 EVAP Fuel Trim

Misfire

%

11%-21%

16-29% at 2,500 RPM

Engine Oil Life Remaining | Engine 3 | % | 0-100% (varies)
Engine Oil Pressure Switch | Engine 3 | Low/OK | OK (Low with low oil pressure)
Engine Run Time | Engine 1 Engine 2 Engine 3 EVAP Fuel Trim

Misfire

Hr:Min:Sec

Depends on time since startup.

Engine Speed | Engine 1 Engine 2 Engine 3 EVAP Fuel Trim

Misfire

RPM

±100 RPM from Desired Idle

EVAP Purge Solenoid Command | Engine 1 EVAP Fuel Trim | % | 0%-100% (varies)
EVAP Test Results | EVAP | Passed/No Result | No Result
EVAP Test Abort Reason | EVAP | Aborted/Not Aborted | Not Aborted
EVAP Test State | EVAP | Test Completed/Test Running | Test Running
EVAP Vent Solenoid Command | Engine 1 EVAP Fuel Trim | Venting/Non-venting | Varies
FC Relay Command | Engine 2 Engine 3 | ON/OFF | OFF (Varies with fan request)
Fuel Level Sensor | Engine 1 EVAP | % | 0-100% Depends on fuel level
Fuel Pump Relay Command | Engine 1 | ON/OFF | ON
Fuel Tank Pressure Sensor | Engine 1 EVAP | mm Hg/in H2O | Depends on Pressure/Vacuum
Fuel Tank Pressure Sensor | EVAP | Volts | Depends on Pressure/Vacuum
Fuel Trim Cell | Engine 1 EVAP Fuel Trim | Cell number | 18-21 at idle (Varies with the air flow, RPM P/N and A/C
Generator L Terminal Signal | Engine 2 | Voltage/No Voltage | Voltage
Generator F Terminal Signal | Engine 2 | % | 0-100% (Varies)
HO2S 2 | Engine 1 Fuel Trim | mV | 0-1000, constantly varying
IAC Position | Engine 1 Fuel Trim | Counts | 5-60
IAT Sensor | Engine 1 Engine 2 Engine 3 EVAP Fuel Trim | °C-°F | 10°-80°C (50°-176°F varies with under hood temperature)
Ignition 1 Signal | Engine 1 Engine 2 Engine 3 EVAP Fuel Trim | Volts | 12.0-15.0 Volts (Varies)
Injector PWM | Engine 2 Fuel Trim Misfire | mS | 3-4 mS
Injector 1 Command | Engine 3 | mS | 3-4 mS
Injector 2 Command | Engine 3 | mS | 3-4 mS
Injector 3 Command | Engine 3 | mS | 3-4 mS
Injector 4 Command | Engine 3 | mS | 3-4 mS
Knock Retard | Engine 1 | Degrees | 0°
Long Term FT | Engine 1 Engine 2 Engine 3 EVAP Fuel Trim | 0% +/- 10-% | 58-198 (-100%- to 100% varies)
Loop Status | Engine 1 Engine 2 Engine 3 EVAP Fuel Trim | Open/Closed | Closed
MAP Sensor | Engine 1 Engine 2 Engine 3 EVAP Fuel Trim

Misfire

kPa

25-48 kPa

MAP Sensor | Engine 1 Engine 2 Engine 3 | Volts | 1-3 volts (Varies with the vacuum and BARO pressure)
MIL Command | Engine 1 | ON/OFF | OFF (with no codes)
Misfire Current #1-#4 | Misfire | 0-255 Counts | 0 (increase with a misfire)
Misfire History #1-#4 | Misfire | 0-255 Counts | 0 (increase with a misfire)
Med. Resolution Resync Counter | Engine 2 | 0-255 Counts | 0
Number of DTCs | Engine 1 EVAP Fuel Trim | Number | 0
O2S 1 | Engine 1 EVAP Fuel Trim | mV | 1-1000 and varying
Power Enrichment | Engine 2 Misfire | Active/Inactive | Inactive
Short Term FT | Engine 1 Engine 2 Engine 3 EVAP Fuel Trim | % | 0% +/- 10%
Spark | Engine 1 Engine 2 Engine 3 Fuel Trim Misfire | Degrees | Varies
Start Up ECT | Engine 2 EVAP Fuel Trim | °C-°F | Varies with start up temperature
TCC Enable Solenoid Command | Engine 1 Engine 2 Misfire | ON/OFF | ON
TP Sensor | Engine 1 Engine 2 EVAP Fuel Trim Misfire | % | 0% (up to 100% at wide open throttle)
TP Sensor | Engine 1 Engine 2 Engine 3 | Volts | 0.200--0.900 volts (up to 5.0 volts at wide open throttle)
TR Switch | Engine 2 Engine 3 Fuel Trim | Low/High | Low/Low/High/High
TWC Temperature Calculated | Fuel Trim | °C-°F | Varies
Vehicle Speed Sensor | Engine 1 Engine 2 Engine 3 EVAP Fuel Trim

Misfire

Km/h/MPH

0

VTD Fuel Disable | Engine 3 | Active/Inactive | Inactive
VTD Auto. Learn Timer | Engine 3 | Active/Inactive | Inactive