GM Service Manual Online
For 1990-2009 cars only

Scan Tool Data List 3.0LL46

The 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 Scan Tool Data List only after the following is determined:

    • Powertrain On-Board Diagnostic (OBD) System Check is completed.
    • No Diagnostic Trouble Codes (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 Scan Tool Data List represents values that would be seen on a normally running engine.

Important: A scan tool that displays faulty data should not be used. The scan tool concern 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 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:

Engine Data1: Engine Data 1 List

EGR Data: Exhaust Recirculation Valve Data

IPC Data: Instrument Panel Cluster Data

Misfire Data: Cylinder Misfire Data

ODD Data: Output Driver Data

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

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

3X Crank Sensor

Misfire

RPM

Varies

24X Crank Sensor

Eng 1, Misfire

RPM

Varies

1-2 Solenoid

ODD

OK/Fault/Invalid State

OK

2-3 Solenoid

ODD

OK/Fault/Invalid State

OK

Abuse Management

Misfire

Active/Inactive

Inactive

A/C High Side Pressure

Eng 1

Volts/PSI

Varies

A/C Relay

ODD

OK/Fault/Invalid State

OK

A/C Request

Eng 1, EGR, Misfire

Yes/No

No

Actual EGR Position

Eng 1, EGR, Misfire

Percent

0

Air Fuel Ratio

Eng 1

Ratio

14.2:1-14.7:1

BARO

Eng 1, EGR

kPa/Volts

65-110 kPa/3.5-4.5 Volts

Brake Switch

Eng1

Applied/Released

Released

Cam Signal Present

Eng1,Misfire

Yes/No

Yes

Commanded A/C

Eng 1, Misfire,EGR

On/Off

Off

Commanded Fuel Pump

Eng 1

On/Off

On

Commanded Gen

IPC

On/Off

On

Current Gear

Eng 1, EGR

Transmission Gear Position

Park(1)

Cycles Of Misfire Data

Misfire

Counts

0-99

Cyl. 1-6 Injector Ckt. History

ODD

OK/Stuck Low (open)/Stuck High/Fault

OK

Cyl. 1-6 Injector Ckt. Status

ODD

OK/Stuck Low (open)/Stuck High

OK

Decel Fuel Mode

EGR, Misfire

Active/Inactive

Inactive

Desired EGR Position

EGR, Misfire

Percent

0

Desired Idle Speed

Eng 1

RPM

PCM Controlled (varies)

Driver Module 1 Status

ODD

Enabled/Off-High Volts/Off High Temp/Invalid State

Enabled

Driver Module 2 Status

ODD

Enabled/Off-High Volts/Off High Temp/Invalid State

Enabled

Driver Module 3 Status

ODD

Enabled/Off-High Volts/Off High Temp/Invalid State

Enabled

Driver Module 4 Status

ODD

Enabled/Off-High Volts/Off High Temp/Invalid State

Enabled

ECT

Eng 1, EGR, Misfire

°C/°F

Varies

EGR Closed Valve Pintle

EGR

Volts

0.14-1.0

EGR Duty Cycle

EGR

Percent

0

EGR Feedback

EGR

Volts

0.14-1.0

EGR Flow Test Count

EGR

Counts

0-10

EGR Position Error

EGR

Percent

0-100

Engine Load

Eng 1, Misfire, EGR

Percent

2-10

Engine Oil Level

IPC

OK/Low

OK

Engine Oil Life

IPC

Percent

0-100

Engine Oil Pressure

IPC

OK/Low/High

OK

Engine Speed

Eng 1, EGR, Misfire

RPM

Varies

Engine Run Time

Eng 1, EGR

Hr: Min: Sec

Varies

EVAP Canister Purge

Eng1

Percent

Low and Varying

EVAP Purge Solenoid

ODD

OK/Fault/Invalid State

OK

Fans High Speed

Eng 1

On/Off

Off

Fans Low Speed

Eng 1

On/Off

Off

FC Relay 1

ODD

OK/Fault/Invalid State

OK

FC Relay 2 and 3

ODD

OK/Fault/Invalid State

OK

Fuel Level

IPC

Percent

0-100

Fuel Pump Ckt. History

ODD

OK/Stuck Low (open)/Stuck High/Fault

OK

Fuel Pump Ckt. Status

ODD

OK/Stuck Low (open)/Stuck High/Fault

OK

Fuel Trim Learn

Eng 1

Enabled/Disabled

Enabled

Generator PWM

IPC

Percent

Varies

HO2S Sensor 1

Eng 1

Ready/Not Ready

Ready

HO2S Sensor 1

Eng 1, Misfire

millivolts

0-1000 and Varying

HO2S XCounts

Eng1

Counts

Varies

Hot Mode

Misfire

On/Off

Off

Hot Open Loop

EGR

Active/Inactive

Inactive

IAC Position

Eng 1

Counts

Varies

IAT

Eng 1,EGR

°C/°F

Varies

Ignition 1

Eng 1, EGR, Misfire, IPC

Volts

Varies

Ignition Mode

Eng 1

IC/Bypass

IC

Injector Pulse Width

Eng 1, Misfire

milliseconds

Varies (1.5-3.5)

Knock Retard

Eng 1, EGR

Degrees

0

Long Term FT

Eng 1

Percent

0-10

Loop Status

Eng 1, EGR

Open/Closed

Closed

MAF

Eng 1, EGR, Misfire

Grams per Second

MAF Frequency

Eng 1

Hz

1200-3000 (depends on altitude and engine load)

MAP

Eng 1, EGR

kPa/Volts

20-48 kPa/0.75-2 Volts (depends on altitude)

MIL

IPC

On/Off

Off

MIL

ODD

OK/Fault/Invalid State

OK

Misfire Current Cyl. 1-6

Misfire

Counts

0

Misfire History Cyl. 1-6

Misfire

Counts

0

Non-Volatile Memory

Eng 1, IPC, EGR, Misfire, ODD

Pass/Fail

Pass

Power Enrichment

Eng 1, Misfire, EGR

Active/Inactive

Inactive

Short Term FT

Eng 1

Percent

0-10

Spark

Eng 1, Misfire

Degrees

20 (varies)

Start Up ECT

Eng 1

°C/°F

Varies

Start Up IAT

Eng 1

°C/°F

Varies

TCC Engaged

Eng1, EGR , Misfire

Engaged/Disengaged

Disengaged

TCC Solenoid

ODD

OK/Fault/Invalid State

OK

Total Misfire Current Count

Misfire

Counts

0

Total Misfire Failures

Misfire

Counts

0

Total Misfire Passes

Misfire

Counts

0

TP Angle

Eng 1, EGR, Misfire

Percent

0

TP Sensor

Eng 1, EGR

Volts

0.20-0.74

Transmission Range

Eng 1, EGR

Transmission Gear Position

Park

TR Switch A

Eng 1

Low/High

Low

TR Switch B

Eng 1

Low/High

High

TR Switch C

Eng 1

Low/High

High

TR Switch P

Eng 1

Low/High

Low

Vehicle Speed

Eng 1, EGR, Misfire

MPH/Km/h

0

VTD Fuel Disable

Eng 1

Active/Inactive

Inactive