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
COOL: Cooling/HVAC Data
ED: Engine Data
EVAP: EVAP Data
FSD: Fuel System Data
FT: Fuel Trim Data List
I/M: I/M Data
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 | Typical Values
--- | --- | --- | ---
Operating Conditions: Engine Idling/Radiator Hose Hot/Closed Throttle/Park or Neutral/Closed Loop/Accessories OFF
5-Volt Reference 1 Circuit Status | COOL, EVAP, FSD, TAC, IND, ID | OK / Fault | OK
5-Volt Reference 2 Circuit Status | EVAP, COOL, FSD, TAC, IND, ID | OK / Fault | OK
5-Volt Reference 3 Circuit Status | EVAP, COOL, FSD, ID, IND, TAC | OK / Fault | OK
A/C Disengage 1 History | COOL | None / Battery Voltage / High Pressure / Engine Speed | None
A/C Disengage 2 History | COOL | None / Battery Voltage / High Pressure / Engine Speed | None
A/C Disengage 3 History | COOL | None / Battery Voltage / High Pressure / Engine Speed | None
A/C Disengage 4 History | COOL | None / Battery Voltage / High Pressure / Engine Speed | None
A/C Disengage 5 History | COOL | None / Battery Voltage / High Pressure / Engine Speed | None
A/C Disengage 6 History | COOL | None / Battery Voltage / High Pressure / Engine Speed | None
A/C Disengage 7 History | COOL | None / Battery Voltage / High Pressure / Engine Speed | None
A/C Disengage 8 History | COOL | None / Battery Voltage / High Pressure / Engine Speed | None
A/C High Side Pressure Sensor | COOL | Volts | 0.96
A/C High Side Pressure Sensor | COOL | kPa / psi | 518 kPa / 75 psi
A/C Off For WOT | COOL | Yes / No | No
A/C Pressure Disable | COOL | Yes / No | No
A/C Relay Circuit Status | COOL | OK / Incomplete / Short B+ / Short GND / Open | Incomplete
A/C Relay Command | COOL, MF, IND, TAC | On / Off | Off
A/C Relay Command | ED, MF | On / Off | Off
A/C Request Signal | COOL | Yes / No | No
Actual Fuel Rail Pressure | ED, FSD, FT | MPa | 3.0-6.0
Air Flow Calculated | EVAP, TAC, ED, HO2S, IND, FT, MF | g/s | Varies
Air Fuel Ratio | ED | Ratio | 14.7:1
APP Indicated Angle | ED, FSD, FT, HO2S, ID, IND, MF, TAC, EVAP, CMP | % | 0
APP Sensor 1 | TAC | Volts | --
APP Sensor 1 and 2 | TAC | Agree / Disagree | Agree
APP Sensor 2 | TAC | Volts | 0.47
APP Sensors | TAC | % | 0
Aux. Vac. Pump Relay Circuit Status | IND | OK / Fault / Indeterminate | Indeterminate
Aux. Vac. Pump Relay Command | IND | On / Off | OFF
Average Injector PWM | FT | ms | 1
BARO | ID, FT, ED, EVAP, FSD, IM, IND, HO2S | kPa | Varies with altitude
BARO Sensor | IND | Volts | 3
Boost Pressure Sensor | FT, IND | kPa | 98
Boost Pressure Sensor | IND | Volts | 1.78
Brake Booster Pressure Sensor | ED | kPa | 26
Brake Pedal Signal Status | ED, TAC | Valid / Invalid | Valid
Calc. TWC Temp. | MP, FT | °C (°F) | 408°C (766°F)
Calculated ECT-Closed Loop Fuel Control | ED, COOL | °C (°F) | Varies
Calculated ECT-Thermostat Diagnosis | ED, COOL | °C (°F) | Varies
Catalyst Monitor Complete This Ignition | I/M | Yes / No | No
Catalyst Monitor Enabled This Ignition | I/M | Yes / No | Yes
Catalytic Converter Protection Active | FT, HO2S | Yes / No | No
CKP Active Counter | ID | Counts | Varies
CKP Resync Counter | ID | Counts | Varies
Cmmd. A/F Equivalence Ratio | FSD, FT, IND, HO2S | Ratio | 1.0:1
CMP Sensor | CMP, ID, MF | RPM | 0
Cold Startup | EVAP, ED, IM | Yes / No | Varies
Control Module Voltage Signal | CMP, FSD, IM, ID, EVAP, ED, COOL, MF, FT, IND, HO2S | Volts | 14.1
Cooling Fan Motor Command | COOL | % | 0
CPP Switch (If equipped) | ED, IM, TAC | Applied / Released | Released
Cruise Control Active | ED, TAC | Yes / No | No
Cycles of Misfire Data | MF | Counts | 0-1999
Cylinder 1 IC Circuit Status | MF | OK / Incomplete / Short B+ / Short Ground / Open | OK
Cyliner 1 Knock Retard | ID | Degrees | Varies
Cyliner 2 Knock Retard | ID | Degrees | Varies
Cyliner 3 Knock Retard | ID | Degrees | Varies
Cyliner 4 Knock Retard | ID | Degrees | Varies
Cylinder 1 Injector Circuit Status | MF | OK / Incomplete / Short B+ / Short Ground / Open | OK
Cylinder 2 IC Circuit Status | MF | OK / Incomplete / Short B+ / Short Ground / Open | OK
Cylinder 2 Injector Circuit Status | MF | OK / Incomplete / Short B+ / Short Ground / Open | OK
Cylinder 3 IC Circuit Status | MF | OK / Incomplete / Short B+ / Short Ground / Open | OK
Cylinder 3 Injector Circuit Status | MF | OK / Incomplete / Short B+ / Short Ground / Open | OK
Cylinder 4 IC Circuit Status | MF | OK / Incomplete / Short B+ / Short Ground / Open | OK
Cylinder 4 Injector Circuit Status | MF | OK / Incomplete / Short B+ / Short Ground / Open | OK
Decel. Fuel Cutoff | FSD, ED, FT, HO2S | Active / Inactive | Inactive
Desired Exh. CMP | CMP | Degrees | 0
Desired Fuel Rail Pressure | FSD, FT | MPa | 3.8
Desired HO2S 1 | FT, HO2S | Lambda | 0.991
Desired HO2S 1 | HO2S | Volts | 0
Desired Idle Speed | CMP, ED, FSD, TAC, EVAP, IND | RPM | 800
Desired Int. CMP | CMP | Degrees | 0
Desired TC Boost | IND | kPa | 48
Distance Since DTC Cleared | ED | km / miles | Varies
EC Ignition Relay Circuit Status | TAC | OK / Incomplete / Short B+ / Short Gnd / Open | Incomplete
EC Ignition Relay Command | ED | On / Off | On
EC Ignition Relay Feedback Signal | ED, TAC | Volts | 14.1
ECT Sensor | IM, ED, FSD, FT, HO2S, EVAP, CMP, COOL | °C (°F) | 92°C (197°F)
Engine Load | ED, CMP, EVAP, FSD, FT, HO2S, ID, IND, TAC, COOL, MF | % | 15-22
Engine Off EVAP Test Conditions Met | EVAP, IM | Yes / No | Yes
Engine Off Time | ID | HH:MM:SS | Varies
Engine Oil Pressure Switch | ED, MF, CMP | OK / Low | OK
Engine Oil Temperature Calculated | CMP, COOL | °C / °F | 87°C /188 °F
Engine Run Time | All | HH:MM:SS | Varies
Engine Speed | All | RPM | 700-900
EVAP Fault History | EVAP | No Fault, No Test Result | No Test Result
EVAP Monitor Complete This Ignition | IM | Yes / No | No
EVAP Monitor Enabled This Ignition | IM | Yes / No | No
EVAP Purge Solenoid Circuit Status | EVAP | OK / Incomplete / Short B+ / Short Gnd / Open | OK
EVAP Purge Solenoid Command | EVAP, FT, HO2S | % | 0-100
EVAP Vent Solenoid Circuit Status | EVAP | OK / Incomplete / Short B+ / Short Gnd / Open | Incomplete
EVAP Vent Solenoid Command | ED, EVAP | Venting / Not Venting | Varies
Exh. CMP Active Counter | CMP, ID | Counts | 255
Exh. CMP Angle | CMP | Degrees | 0
Exh. CMP Command | CMP | % | 6
Exh. CMP Solenoid Circuit Status | CMP | OK / Incomplete / Short B+ / Short Gnd / Open | OK
Exh. CMP Variance | CMP | Degrees | 0
FC Circuit Status | COOL | OK / Incomplete / Short B+ / Short Gnd / Open | Incomplete
FRP Regulator Command | FSD, FT | Degrees | 125
Fuel Level Sensor | EVAP, FSD | Volts | Varies
Fuel Pump Relay Circuit Status | FSD, FT | OK / Incomplete / Short B+ / Short Gnd / Open | Fault
Fuel Pump Relay Command | FSD, ED | On / Off | On
Fuel Rail Pressure Sensor | FT, ED | Volts | 1.2-1.5
Fuel Tank Level Remaining | ED, FSD, FT, EVAP, MF, IM | % | Varies
Fuel Tank Level Remaining | EVAP, MF, IM | Gallons / Liters | Varies
Fuel Tank Pressure Sensor | EVAP, ED, FSD | mm/Hg / in H2O | Varies
Fuel Tank Pressure Sensor | EVAP | Volts | 1.5
Fuel Tank Rated Capacity | EVAP | Gallons / Liters | Varies
Fuel Trim Learn | FT | Enabled / Disabled | Disabled
Fuel Volatility | FT, FSD, EVAP | Low / Moderate / High | Varies
HO2S 1 | HO2S, IND, EVAP, ED, FT | Lambda | Varies
HO2S 1 Heater Circuit Status | HO2S | OK / Incomplete / Short B+ / Short Gnd / Open | Incomplete
HO2S 1 Heater Command | HO2S | On / Off | On
HO2S 1 Heater Command | HO2S | % | 37
HO2S 1 Sensing Element | HO2S | Ohms | 300
HO2S 2 | FT, HO2S, ED | Mv | 0.795 (Varies)
HO2S 2 Heater Circuit Status | HO2S | OK / Incomplete / Short B+ / Short Gnd / Open | Incomplete
HO2S 2 Heater Command | HO2S | On / Off | On
HO2S 2 Heater Command | HO2S | % | 100
HO2S 2 Sensing Element | HO2S | Ohms | 0
HO2S Heater Monitor Complete This Ignition | IM | Yes / No | No
HO2S Heater Monitor Enabled This Ignition | IM | Yes / No | Yes
HO2S Sensor 1 Module Signal | CMP, FT, HO2S, MF | Volts | 1.47
HO2S/O2S Monitor Complete This Ignition | IM | Yes / No | No
HO2S/O2S Monitor Enabled This Ignition | IM | Yes / No | Yes
IAT Sensor | All | °C (°F) | --
IAT Sensor 2 | ED, EVAP, COOL, FT, IND | °C (°F) | 15-40
Ignition 0 Signal | ED, TAC | Units | --
Ignition 1 Signal | ED, EVAP | On / Off | On
Ignition Off Time | ED, EVAP, IM | HH:MM:SS | Varies
Initial Brake Apply Signal | IM, TAC | Released / Applied | Released
Inj. 1 Disabled Due to Misfire | MF | Yes / No | No
Inj. 2 Disabled Due to Misfire | MF | Yes / No | No
Inj. 3 Disabled Due to Misfire | MF | Yes / No | No
Inj. 4 Disabled Due to Misfire | MF | Yes / No | No
Injector 1 Command | FT | ms | Varies
Injector 2 Command | FT | ms | Varies
Injector 3 Command | FT | ms | Varies
Injector 4 Command | FT | ms | Varies
Int. CMP Active Counter | CMP, ID | Counts | 255
Int. CMP Angle | CMP | Degrees | 0
Int. CMP Command | CMP | % | 6
Int. CMP Solenoid Circuit Status | CMP | OK, Incomplete, Short B+, Short Gnd / Open | OK
Int. CMP Variance | CMP | Degrees | 0
Intake Manifold Pressure | ED, FT, IND | kPa | Varies
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 | Varies
KS 1 Signal | ID | Volts | Varies
KS 2 Signal | ID | Volts | Varies
Long Term FT | ED, EVAP, FT, HO2S | % | 0
Loop Status Sensor 1 | ED, EVAP, FT, HO2S | Open / Closed | Varies
Loop Status Sensor 2 | ED, EVAP, FT, HO2S | Open / Closed | Varies
LT FT Idle/Decel. | ED, EVAP, FT, HO2S | % | 0
MAF Sensor | ID, FT, ED, EVAP, CMP, FSD, MF, TAC, HO2S | g/s | 2-4
MAF Sensor | IND | Hz | 1950
MAP Sensor | IND, FT, ED, TAC, CMP, FSD, EVAP, MF | kPa | 30-38
MAP Sensor | IND | Volts | 0.67
MIL Circuit Status | ED | OK / Incomplete / Short B+ / Short Gnd / Open | Incomplete
MIL Command | ED | On / Off | 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
Moderate Brake Apply Signal | TAC | Applied / Released | Released
PNP Switch | ED | Park / Neutral | Park
Post Inj. Cyl. 1 Command | FT | ms | 0
Post Inj. Cyl. 2 Command | FT | ms | 0
Post Inj. Cyl. 3 Command | FT | ms | 0
Post Inj. Cyl. 4 Command | FT | ms | 0
Power Enrichment | ED, FSD, MF, FT | Active / Inactive | Inactive
Reduced Engine Power | TAC | Active / Inactive | Inactive
Short Term FT | ED, EVAP, FT, HO2S | % | 0
Spark | HO2S, FT, ED, FSD, IND, MF, COOL, ID | Degrees | Varies
Start Up ECT | EVAP, COOL, IM, HO2S | °C (°F) | Varies
Start Up IAT | ED, FT, IND | °C (°F) | --
Stop Lamp Pedal Switch | IM | Released / Applied | Released
System Power Mode | ED, EVAP | Offawake / Run / Accessory | Run
TAC Forced Engine Shutdown | TAC | Yes / No | No
TAC Motor | TAC | Enabled / Disabled | Enabled
TC Bypass Solenoid Circuit Status | IND | OK, Incomplete, Short B+, Short Gnd / Open | --
TC Bypass Solenoid Command | ID | On / Off | On
TC Wastegate Solenoid Circuit Status | ID, IND | OK, Incomplete, Short B+, Short Gnd / Open | Incomplete
TCS Torque Delivered Signal | ID, TAC | % | 0
TCS Torque Request Signal | TAC | % | 98
Total Fuel Trim Average | EVAP, ID, HO2S, FT | % | Varies
Total Knock Retard | COOL, ID | Degrees | Varies
Total Misfire | MF | Counts | 0
TP Desired Angle | TAC | % | 2
TP Indicated Angle | HO2S, ED, TAC, FSD, FT, CMP, EVAP, MF, IND | % | 2-5
TP Sensor 1 | TAC | Volts | 4.22
TP Sensor 1 Learned Minimum | TAC | Volts | 4.31
TP Sensor 2 | TAC | Volts | 0.76
TP Sensor 2 Learned Minimum | TAC | Volts | 0.69
TP Sensors 1 and 2 | TAC | Agree / Disagree | Agree
Vehicle Speed Sensor | ALL | kmh / mph | 0
Volumetric Efficiency | ID, ED, EVAP, FT, HO2S, CMP, MF, COOL | % | 15-22
Warm-ups Since DTC Cleared | ED | Counts | Varies
Wastegate Solenoid Command | IND | % | 0
Wide Open Throttle | TAC | Yes / No | No