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 given 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 is determined:

• | The Diagnostic System Check - Vehicle is completed.

• | No DTCs

• | On-board diagnostics are functioning properly.

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

Only the parameters listed below are referenced in this service manual 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 can be located on the scan tool. Refer to 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 of the data lists indicated below.
CMP: CMP Actuator Data
ED: Engine Data
EVAP: EVAP Data
FT: Fuel Trim Data List
IND: Induction Data
MF: Misfire Data List
TAC: Throttle Actuated Control Data List
HO2S: HO2S Data
ID: Ignition Data

Scan Tool Parameter | Data List | Parameter Range/Units | Typical Data Values
--- | --- | --- | ---
Operating Conditions: Engine Idling/Radiator Hose Hot/Closed Throttle/Park or Neutral/Closed Loop/Accessories Off
5-Volt Reference 1 | EVAP, ID, IND, TAC | Volts | 4.5 Volts
5-Volt Reference 1 Circuit Status | ID, IND, TAC | OK/Incomplete/Short B+/ Short Ground/ Short Open | OK
5-Volt Reference 2 | EVAP, ID, IND, TAC | Volts | 4.5 Volts
5-Volt Reference 2 Circuit Status | ID, IND, TAC | OK/Incomplete/Short B+/ Short Ground/ Short Open | OK
A/C Relay Command | ED, MF, IND, TAC | On/Off | Off
Air Flow Calculated | ED, EVAP, FT, HO2S, IND, MF, TAC | g/s | 3-5 g/s
Ambient Air Temp | ED, EVAP | Degrees | Varies
APP Indicated Angle | ALL | 0-96% | 0%
APP Sensor 1 | TAC | Volts | 1.02 Volts
APP Sensor 1 Indicated Position | TAC | % | 0%
APP Sensor 2 | TAC | Volts | 4.04 Volts
APP Sensor 2 Indicated Position | TAC | % | 0%
APP Sensor 1 and 2 | TAC | Agree/Disagree | Agree
APP Sensors | TAC | % | 0%
BARO | ED, EVAP, FT, HO2S, ID, IND | kPa | 65-104 kPa/ Varies w/Altitude
BPP Circuit Signal | TAC | Applied/Released/ Invalid | Released
Calc. TWC Temp | FT, MF | °C/°F | 800-1,000°F
Catalytic Converter Protection Active | FT, HO2S | Yes/No | No
CKP Active Counter | ID | Counts | Varies
CKP Resync Counter | ID | Counts | 0
CKP Sensor | ID | RPM | 600-700
CMMD. A/F Equivalence Ratio | ED, FT, IND, HO2S | Ratio | 1.0:1
CMP Sensor | CMP, ID, MF | RPM | Varies
Cold Start-Up | ED, EVAP | Yes/No | Varies
CPP Switch | ED, TAC | Applied/Released | Released
Cruise Control Active | ED, TAC | Yes/No | No
Cycles of Misfire Data | MF | 0-100 Counts | Varies
Cyl. 1 IC Circuit Status | MF | OK/Incomplete/ Short B+/ Short Ground/ Short Open | OK
Cyl. 2 IC Circuit Status | MF | OK/Incomplete/ Short B+/ Short Ground/ Short Open | OK
Cyl. 3 IC Circuit Status | MF | OK/Incomplete/ Short B+/ Short Ground/ Short Open | OK
Cyl. 4 IC Circuit Status | MF | OK/Incomplete/ Short B+/ Short Ground/ Short Open | OK
Cyl. 1 Inj. Circuit Status | MF | OK/Incomplete/ Short B+/ Short Ground/ Short Open | OK
Cyl. 2 Inj. Circuit Status | MF | OK/Incomplete/ Short B+/ Short Ground/ Short Open | OK
Cyl. 3 Inj. Circuit Status | MF | OK/Incomplete/ Short B+/ Short Ground/ Short Open | OK
Cyl. 4 Inj. Circuit Status | MF | OK/Incomplete/ Short B+/ Short Ground/ Short Open | OK
Decel Fuel Cutoff | ED, FT, HO2S | Active/Inactive | Inactive
Desired Exh. CMP | CMP | Degrees | 0
Desired Idle Speed | CMP, ED, EVAP, TAC | RPM | PCM Controlled
Desired Int. CMP | CMP | Degrees | 0°
Distance Since DTC Cleared | ED | km/h /mph | Varies
EC Ignition Relay Circuit Status | TAC | OK/Incomplete/ Short B+/ Short Ground/ Short Open | Incomplete
EC Ignition Relay Command | ED, TAC | ON/OFF | ON
EC Ignition Relay Feedback Signal | ED, TAC | Volts | 12-15 Volts
ECT Sensor | ALL | -40 to -40°C (+151 to +303°F) | 88-105°C (190-221°F)
Engine Load | ALL | 0-100% | 23-24% @ Idle
Engine Oil Life Remaining | CMP | % | Varies
Engine Oil Pressure Switch | CMP, ED, MF | OK/Low | OK
Engine Oil Temp Calculated | CMP | Degrees | Varies
Engine Run Time | ALL | Hrs, Min, Sec | Varies
Engine Speed | ALL | 0-10,000 RPM | 500-700 RPM
Engine Off Time | EVAP | HH:MM:SS | Varies
EVAP Fault History | EVAP | No Fault/ Excess Vacuum/ Purge Valve Leak/ Small Leak/ Weak Vacuum/ No Test Result | No Fault
EVAP Purge Solenoid Command | ED, EVAP, FT, HO2S | 0-100% | 10-30%
EVAP Purge Solenoid Circuit Status | EVAP | OK/Incomplete/ Short B+/ Short Ground/ Short Open | OK
EVAP Vent Solenoid Command | ED, EVAP | Not Venting/Venting | Venting
EVAP Vent Solenoid Status | EVAP | OK/Incomplete/ Short B+/ Short Ground/ Short Open | Incomplete
Exh. CMP Active Counter | CMP, ID | Counts | 0-250
Exh. CMP Angle | CMP | Degrees | 0°
Exh. CMP Command | CMP | % | 0%
Exh. CMP Solenoid Circuit Status | CMP | OK/ Incomplete/ Short B+/ Short Ground/ Short Open | Incomplete
Exh. CMP Variance | CMP | Degrees | 0°
Fuel Level Sensor | EVAP | Volts | 1-2 Volts
Fuel Pump Relay Circuit Status | ED | OK/ Incomplete/ Short B+/ Short Ground/ Short Open | Incomplete
Fuel Tank Level Remaining | ED, EVAP, FT, MF | 0% | Varies
Fuel Tank Pressure Sensor | EVAP | mm/Hg / In H2O | -1 to +1
Fuel Tank Pressure Sensor | EVAP | Volts | 1.5 Volts
Fuel Tank Rated Capacity | EVAP | Liters | 62.4
Fuel Trim Cell | ED, FT | Counts | 16, 17, 21
Fuel Trim Learn | FT | Enable/Disable | Enabled
Fuel Trim System | FT | Disabled/ Enabled/ Run purge test | --
Fuel Trim System Test State | FT | Monitoring | Varies
Fuel Volatility | EVAP, FT | Low/ Med/ High | Low
HO2S 1 | ED, EVAP, FT, HO2S, IND | mV | 10-1,000 mV and Varying
HO2S 1 Heater | HO2S | Amps | Varies
HO2S 1 Heater Circuit Status | HO2S | OK/ Incomplete/ Short B+/ Short Ground/ Short Open | OK
HO2S 1 Heater Command | HO2S | ON/ OFF | ON
HO2S 1 Heater Command | TAC | % | 98%
HO2S 2 | ED, FT, HO2S | mV | 10-1,000 mV and Varying
HO2S 2 Heater | HO2S | Amps | Varies
HO2S 2 Heater Circuit Status | HO2S | OK/ Incomplete/ Short B+/ Short Ground/ Short Open | OK
HO2S 2 Heater Command | HO2S | ON/ OFF | ON
HO2S 2 Heater Command | TAC | % | 98%
Hot Open Loop | FT, HO2S | Active/Inactive | Inactive
IAT Sensor | ALL | -40 to +151°C (-40 to +303°F) | Depends on ambient temperature
Ignition Accessory Signal | ED, TAC | On/Off | Off
Ignition 1 Signal | ALL | 0-25 volts | 11.5-14.5 Volts
Injector 1 Disabled Due to Misfire | MF | Yes/ No | No
Injector 2 Disabled Due to Misfire | MF | Yes/ No | No
Injector 3 Disabled Due to Misfire | MF | Yes/ No | No
Injector 4 Disabled Due to Misfire | MF | Yes/ No | No
Int. CMP Active Counter | CMP, ID | Counts | 0-250
Int. CMP Angle | CMP | Degrees | 0%
Int. CMP Command | CMP | % | 0%
Int. CMP Solenoid Circuit Status | CMP | OK/ Incomplete/ Short B+/ Short Ground/ Short Open | Incomplete
Int. CMP Variance | CMP | Degrees | 0%
Intake Manifold Pressure | ED, FT, IND | kPa | 55-65 kPa
Injector PWM | ED, FT, HO2S, MF | Milliseconds | 2-6 ms
Knock Detected Cyl. 1 | ID | Yes/No | No
Knock Detected Cyl. 2 | ID | Yes/No | No
Knock Detected Cyl. 3 | ID | Yes/No | No
Knock Detected Cyl. 4 | ID | Yes/No | No
Knock Retard | ID | Degrees | 0°
Long Term FT | ED, EVAP, FT, HO2S | % | Near 0%
Long Term Fuel Trim Test Avg. | FT | Counts | 0.95-1
Long Term Fuel Trim Test Avg. w/o Purge | FT | Counts | 0.95-1
Loop Status | ED, EVAP, FT, HO2S | Open/Closed | Closed
MAF Performance Test | FT, IND, TAC | OK/ Fault | OK
MAF Sensor | IND | Hz | 1,800-2,400
MAF Sensor | ALL | g/s | 3-6g/s
MAP Performance Test 1 | FT, MAP, IND, TAC | OK | OK
MAP Performance Test 2 | FT, IND, TAC | OK/ Fault | OK
MAP Sensor | IND | Volts | 1-2 Volts
MAP Sensor | ALL | kPa | 20-48 kPa
MIL Circuit Status | ED | OK/ Incomplete/ Short B+/ Short Ground/ Short Open | Incomplete
MIL Command | ED | Off/On | Off
MIL Requested By DTC | ALL | Yes/No | No
Misfire Current Cyl #1 | MF | Counts | 0
Misfire Current Cyl #2 | MF | Counts | 0
Misfire Current Cyl #3 | MF | Counts | 0
Misfire Current Cyl #4 | MF | Counts | 0
Misfire History Cyl #1 | MF | Counts | 0
Misfire History Cyl #2 | MF | Counts | 0
Misfire History Cyl #3 | MF | Counts | 0
Misfire History Cyl #4 | MF | Counts | 0
PNP Switch | ED | Park/ Net/ In Gear | Varies
Power Enrichment | ED, FT, HO2S, MF | Active/Inactive | Inactive
Reduced Engine Power | TAC | Active/Inactive | Inactive
Short Term Fuel Trim Test Avg. | FT | Counts | 0.95-1
Short Term FT | ED, EVAP, FT, HO2S | % | Near 0%
Spark | ED, FT, HO2S, ID, IND, MF | Degrees | 5-20°
Start Up ECT | EVAP, HO2S | °C/°F | Varies
Start Up IAT | EVAP, HO2S | °C/°F | Varies
TAC Forced Engine Shutdown | TAC | Yes/No | No
TAC Motor | TAC | Enabled/Disabled | Enabled
TAC Motor Command | TAC | % | 20%
TCC/Cruise Brake Pedal Switch | ED, TAC | Applied/Released | Released
TCS Torque Delivered Signal | TAC | % | 0%
TCS Torque Request Signal | TAC | % | 0%
Torque Management Spark Retard | ID | Degrees | 0°
Total Knock Retard | ID | Degrees | 0°
Total Misfire Count | MF | Count | 0
TP Desired Angle | TAC | % | 4%
TP Indicated Angle | ALL | % | 4.2%
TP Performance Test | FT, IND, TAC | Active/Inactive | Inactive
TP Sensor 1 | TAC | 0-5 Volts | 4.24 Volts
TP Sensor 1 Indicated Position | TAC | % | 4%
TP Sensor 1 Learned Minimum | TAC | Volts | 0.55 Volts
TP Sensors 1 and 2 | TAC | Agree/Disagree | Agree
TP Sensor 2 | TAC | 0-100% | 4%
TP Sensor 2 | TAC | 0-5 Volts | 0.43 Volts
TP Sensor 2 Indicated Position | TAC | % | 4%
TP Sensor 2 Learned Minimum | TAC | Volts | 0.57 Volts
Vehicle Speed Sensor | ALL | km/h (mph) | 0
Warm-ups Since DTC Cleared | ED | Counts | Varies
Warm-ups Without Emission Faults | ED | Counts | Varies
Warm-ups Without Non-Emission Faults | ED | Counts | Varies
Wide Open Throttle | TAC | Yes/No | No