GM Service Manual Online
For 1990-2009 cars only

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 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 the values that would be seen on a normal running 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 can result in misdiagnosis and in 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 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 1: Engine Data 1 List

Eng 2: Engine Data 2 List

Eng 3: Engine Data 3 List

CC: Cruise Control Data

EE: Enhanced EVAP Data

FT: Fuel Trim Data List

MF: Misfire Data List

TAC: TAC Data List

Scan Tool Parameter

Data List

Parameter Range/Units

Typical Data Values

Engine Idling/Radiator Hose Hot/Closed Throttle/Park or Neutral/Closed Loop/Accessories Off

A/C Clutch Feedback Signal

Eng 2

On/Off

Off

A/C High Side Pressure

Eng 2

kPa/psi

Varies

A/C High Side Pressure

Eng 2

Volts

Varies

A/C Relay Command

Eng 1, 2, 3, MF

On/Off

Off

A/C Request

Eng 2

Yes/No

No

Air Fuel Ratio

ENG 3, 2

Ratio

14.7:1

AIR Pump Relay

Eng 1, FT

On/Off

Off

AIR Solenoid Command

Eng 1, FT

On/Off

Off

APP Average

TAC

Counts

Varies

APP Indicated Angle

ENG 1, 2, EE, FT, CC, TAC

0-100%

Varies

APP Sensor 1

TAC

Volts

0.25-1.1V

APP Sensor 2

TAC

Volts

3.9-4.8

APP Sensor 3

TAC

Volts

3.2-4.5

APP Sensor 1 Angle

TAC

0-100%

0%

APP Sensor 2 Angle

TAC

0-100%

0%

APP Sensor 3 Angle

TAC

0-100%

0%

APP Sensor 1 and 2

TAC

Agree/Disagree

No

APP Sensor 1 and 3

TAC

Agree/Disagree

No

APP Sensor 2 and 3

TAC

Agree/Disagree

No

BARO

Eng 1, FT, EE

kPa/Volts

65-104 kPa/3.5-4.9V (Varies w/Altitude)

CMP Sensor High to Low

Eng 2

Counts

Varies

CMP Sensor Low to High

Eng 2

Counts

Varies

Clutch Pedal Switch

CC, Eng 1

Applied/Released

Released

Cold Start Up

EE

Yes/No

Varies

Column Lock Fuel Disable-ABS DTC

Eng 3

Yes/No

No

Column Lock Fuel Disable-BCM DTC

Eng 3

Yes/No

No

Column Lock PCM-BCM Com.

Eng 3

Fault/OK

OK

Cruise Control Active

Eng 1, 2, 3, TAC, CC

Yes/No

No

Cruise Disengage History 1-8

CC

Go to Diagnostic System Check - Cruise Control in Cruise Control

Varies

Cruise ON/OFF Switch

CC, TAC

On/Off

Off

Cruise Release Brake Pedal Switch

Eng 2, 3, CC, TAC

Applied/Released

--

Cruise Resume/Accel

TAC, CC

On/Off

Off

Cruise Set/Coast

TAC, CC

On/Off

Off

Current Gear

Eng 2

1-4

1

Cycles Of Misfire Data

MF

Counts

0-100

Desired Idle Speed

Eng 1, 2, 3, , EE, TAC

RPM

PCM Controlled

DTC Set This Ignition

Eng 1, 2, EE, FT, CC

Yes/No

No

ECT

Eng 1, 2, 3, EE, FT, MF, TAC

-39° to 140°C (-38° to 284°F)

90° to 110°C (194° to 230°F)

Engine Load

Eng 1, 2, 3, CC, EE, FF, FR, FT, MF, TAC

0-100%

2% at Idle

9% at 2500 RPM

Engine Oil Level Switch

Eng 2, 3

OK/Not OK

OK

Engine Oil Life Remaining

ALL

0-100%

Varies

Engine Oil Pressure Sensor

Eng 3

kPa/psi/Volts

Varies

Engine Run Time

ALL

Hrs, Min, Sec

Varies

Engine Speed

All

0-10,000 RPM

Varies

EVAP Purge Solenoid Command

Eng 1, EE, FT

0-100%

Varies

EVAP Vent Solenoid Command

Eng 1, EE, FT

Venting/Not Venting

Varies

Extended Travel Brake Pedal Switch

Eng 1, 2, 3

Applied/Released

Released

FC Relay 1

Eng 2, 3

On/Off

Depends on engine temperature and A/C Pressure

FC Relay 2 and 3

Eng 2, 3

On/Off

Depends on engine temperature and A/C Pressure

Fuel Level Sensor Left Tank

EE

5-0V

0.7-2.5 Volts

Fuel Level Sensor Right Tank

EE

5-0V

0.7-2.5 Volts

Fuel Tank Level Remaining

FT, EE

0-19 gal./0-73L

Varies

Fuel Tank Level Remaining

FT, EE

0-100%

Varies

Fuel Tank Pressure

Eng 1, EE

-32.7 to 14.0 mm/Hg

-17.5 to 7.5 in/H2O

Varies

Fuel Tank Pressure

EE

0-5 Volts

Varies

Fuel Tank Rated Capacity

EE

73L (19 gal.)

73L (19 gal.)

Fuel Trim Cell

Eng 1, FT, EE

0-23

Varies

Fuel Trim Learn

Eng 1, EE, FT

Enabled/Disabled

Enabled (may Toggle)

Generator F Terminal

Eng 2

0-100%

Varies

Generator L Terminal

Eng 2

Voltage/No Voltage

Voltage

HO2S Bank 1 Sensor 1

Eng 1, FT, EE

Millivolts

10-1,000 mV and Varying

HO2S Bank 1 Sensor 2

Eng 1, FT

Millivolts

10-1,000 mV and Varying

HO2S Bank 2 Sensor 1

Eng 1, FT, EE

Millivolts

10-1,000 mV and Varying

HO2S Bank 2 Sensor 2

Eng 1, FT

Millivolts

10-1,000 mV and Varying

IAT

Eng 1, 2, 3,. EE, FT

-39° to 140°C (-38° to 284°F)

Varies

Ignition 1 Signal

Eng 1, 2, 3, EE, CC, FT, TAC

0-25 Volts

11.5-14.5

Inj. PWM Average Bank 1

Eng 2, FF, FT, MF

Milliseconds

1-4

Inj. PWM Average Bank 2

Eng 2, FT, FF, MF

Milliseconds

1-4

Knock Retard

Eng 1

0°-16°

Varies

Long Term FT Avg. Bn 1

FT

Percentage

Near 0 %

Long Term FT Avg. Bn 2

FT

Percentage

Near 0 %

Long Term FT Bank 1

Eng 1, 2, 3, EE, FT

Percentage

Near 0 %

Long Term FT Bank 2

Eng 1, 2, 3, EE, FT

Percentage

Near 0 %

Loop Status

Eng 1, 2, 3, EE, FT MF

Open/Closed

Closed

MAF Sensor

Eng 1, 2, 3, EE, FT, MF, TAC

Grams Per Second (g/s)

5-9 at Idle (depends on altitude)

20-26 at 2500 RPM (depends on altitude)

MAF Sensor

Eng 3

0-31,999Hz

Varies

MAP Sensor

Eng 1, 2, 3, EE, FT, MF, TAC

kPa/Volts

20-48 kPa/1.0-2.0 V (varies w/altitude)

MIL Command

Eng 1

Off/On

Off

Mileage Since DTC Cleared

Eng 3

km/Miles

Varies

Misfire Current 1-8

MF

0-200

0

Misfire History 1-8

MF

0-65,535

0

PCM Reset

Eng 1, EE, FT

Yes/No

No

PCM/VCM in VTD Fail Enable

Eng 3

Yes/No

No

Power Enrichment

Eng 2, FT

Active/Inactive

--

Powertrain Induced Chassis Pitch

Eng 3

Active/Inactive

Inactive

Reduced Engine Power

Eng 1, 3, TAC, CC

Active/Inactive

Inactive

Reverse Inhibit Solenoid

Eng 1

On/Off

No

Short Term FT Avg. Bn 1

FT

Percentage

Near 0 %

Short Term FT Avg. Bn 2

FT

Percentage

Near 0 %

Short Term FT Bank 1

Eng 1, 2, 3, EE, FT

Percentage

Near 0 %

Short Term FT Bank 2

Eng 1, 2, 3, EE, FT

Percentage

Near 0 %

Skip Shift Lamp Command

Eng 1

On/Off

Off

Skip Shift Solenoid Command

Eng 1

No Skip/Skip

No Skip

Spark

Eng 1, 2, 3, FT, MF

Degrees

Varies

Start Up ECT

Eng 2, EE, FT

C°/F°

Varies

Stop Lamp Pedal Switch

Eng 1, 2, 3, TAC, CC

Applied/Released

Released

TAC/PCM Communication

TAC, CC

OK/Fault

OK

TCC/Cruise Brake Pedal Switch

Eng 2

Applied/Released

Released

TCC Enable Solenoid Command

Eng 2, MF

Enabled/Disabled

Disabled

TFP Sw.

Eng 2, 3

Park/Neutral, Reverse, Drive 4, Drive 3, Drive 2, Drive 1, Invalid

Park/Neutral

TFT Sensor (If equipped)

Eng 3

C°/F°

--

Torque Delivered Signal

ENG 2, TAC,

N·m/Ft-Lbs

Varies

Torque Request Signal

ENG 2, TAC

N·m/Ft-Lbs

Varies

TP Desired Angle

Eng 1, 2, EE, TAC, CC

Percentage

3-10 %

TP Indicated Angle

All

Percentage

3-9%

TP Sensor 1

TAC

Percentage

Varies

TP Sensor 1

TAC

Volts

0.25-1.5 V

TP Sensor 2

TAC

Percentage

Varies

TP Sensor 2

TAC

Volts

4.0-1.5 V

TP Sensors 1 and 2

TAC

Agree/Disagree

No

Traction Control Signal

CC

Active/Inactive

Inactive

Traction Control Status

Eng 2

Active/Inactive

Inactive

Tr Sw.

Eng 2, 3

Transaxle Gear Position

Park/Neutral

Vehicle Speed Sensor

ALL

km/h/mph

0 km/h (0 mph)

VTD Auto Learn Timer

Eng 3

Active/Inactive

Inactive

VTD Fuel Disable

Eng 3

Active/Inactive

Inactive

VTD Fuel Disable Until Ign. Off

Eng 3

Yes/No

No

Warm-Ups w/o Emis. Faults

Eng 3

Counts

0-255

Warm-Ups w/o Non-Emis. Faults

Eng 3

Counts

0-255