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 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 Engine Controls Diagnostic 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 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.

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.

DPF: DPF Data

EGR: EGR Data

Eng 1: Eng Data 1

Eng 2: Eng Data 2

FS1: Fuel System Data 1

FS2: Fuel System Data 2

IAF: IAF Value Data

TC: TC Data

Engine Scan Tool Data List

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Engine Idling/Lower Radiator Hose Hot/Closed Throttle/Park or Neutral/Accessories Off

5-Volt Reference 1-3

Eng 1

Volts

5 V

A/C Request Signal

Eng 1

Yes/No

No

Actual Fuel Rail Pressure

All

MPa/PSI

25-40 MPa (3,626-5,801 PSI)

After Injection Fuel Rate

DPF

mm³

Varies

APP Indicated Angle

All

%

0.0

APP Sensor 1

Eng 1

Volts

0.44-0.95

APP Sensor 2

Eng 1

Volts

3.9-4.5

APP Sensor 3

Eng 1

Volts

3.6-4.1

Balancing Rate Cyl. 1-6

FS2

mm³

-2.7 to +2.7

BARO

FS1, FS2, EGR

kPa

Varies

Basic Fuel Rate

FS2

mm³

Varies

Battery Voltage

Eng 1

Volts

12-14

Boost Pressure Sensor

All

kPa/PSI

60-170 kPa

Crank Requests Signal

Eng 1

Yes/No

No

Crank Signal Present

Eng 2

Yes/No

Yes

CAM Signal Present

Eng 1

Yes/No

Yes

Catalytic Converter 1

DPF

°C/°F

Varies

Catalytic Converter 2

DPF

°C/°F

Varies

Clutch Pedal Switch

Eng 1, Eng 2

Applied/Released

Released

Cruise Control Active

Eng 1

Yes/No

No

Cruise ON/OFF Switch

Eng 1

ON/OFF

OFF

Cruise Resume/Accel Switch

Eng 1

ON/OFF

OFF

Cruise Set/Coast Switch

Eng 1

ON/OFF

OFF

Des. TC Van Pos. Ctrl. Solenoid

TC

amps

0.6-0.8

Desired Boost

TC

kPa

Varies

Desired EGR Position

EGR

%

0

Desired FRP Regulator

FS

mA

1,700-1,900

Desired Fuel Rail Pressure

Eng 1, Eng 2, FS, EGR

MPa/PSI

25-40 MPa (3,626-5,801 PSI)

Desired Idle Speed

Eng 1, FS, DPF

RPM

600-700

Desired TC Vane Position

TC

%

32

DPF Error Count

DPF

Counts

0

DPF Manual Regenerates On Time

DPF

Seconds

Varies

DPF Regeneration Status

DPF

Varies

Complete

DPF Regeneration Complete Status

DPF

Varies

Complete

DPF Regeneration Switch

DPF

Yes/No

No

DPF Regeneration Time

DPF

Seconds

Varies

DTC Set This Ignition

Eng 1

Yes/No

No

ECT Sensor

Eng 1, FS, EGR, TC, DPF

°C/ °F

85-105°C /185-220°F

EGR Learned Minimum Position

EGR

%

Varies

EGR Learned Minimum Position

EGR

mm

Varies

EGR Position Sensor

EGR

%

0

EGR Position Variance

EGR

%

0

EGR Solenoid Command

EGR

%

15-20

EGR Sensor 1

DPF

°C/ °F

Varies

EGR Sensor 2

DPF

°C/ °F

Varies

EGR Temperature Sensor 1

EGR

°C/ °F

Varies

EGR Temperature Sensor 2

EGR

°C/ °F

Varies

Engine Load

Eng 1, EGR, TC, DPF

%

0

Engine Oil Level Switch

Eng 1

OK/Low

OK

Engine Oil Life Remaining

Eng 1

%

0-100

Engine Oil Pressure Sensor

FS

Volts

Varies

Engine Power Relay

Eng 1

ON/OFF

ON

Engine Run Time

All

Hrs/Mins/Sec

Varies with engine run time

Engine Speed

All

RPM

600-700

Exhaust Brake Relay Command

Eng 1

ON/OFF

OFF

Exhaust Brake Throttle Command

DPF

Yes/No

No

Exhaust Brake Switch

Eng 1

ON/OFF

OFF

Exhaust Pressure Sensor

EGR, TC

kPa

0

Exhaust Pressure Variance Entrance

DPF

kPa

0

Final Fuel Rate

Eng 1, Eng 2, FS

mm³

varies

FRP Regulator Fuel Flow Command

FS

mm³

varies

FRP Regulator Command

FS

mA

1,700-1,900

Fuel Level Sensor

FS

%

0-100

Fuel Level Sensor Rear Tank

FS

Volts

Varies

Fuel Level to Cluster

FS

%

Varies

Fuel Rate at Start

FS

mm³

Varies

Fuel Rate Correction

FS

mm³

Varies

Fuel Tank Rated Capacity

FS

Liters/Gallons

Varies

Fuel Temperature Sensor

Eng 1, Eng 2, Eng 3, FS

°C/°F

10-90°C/50-194°F

GEN L-Terminal Signal

Eng 1

Voltage/No Voltage

Voltage

Glow Plug Relay

Eng 1

ON/OFF

OFF

High Idle Switch

Eng 1

ON/OFF

OFF

IAF Valve Position

Eng 1, EGR, TC, DPF

%

Varies

IAT Sensor 1 or 2

Eng 1, FS, EGR, TC, DPF

°C/°F

10-90°C/50-194°F

Ignition 1 Signal

DPF, Eng 1, EGR, TC

Volts

12-14

Injector 1-6 Command

DPF, Eng 2

ms

0.7-0.9

Intake Air Heater Relay Command

Eng 1

ON/OFF

OFF

Low Coolant Level

Eng 1

Yes/No

No

MAF Sensor

DPF, Eng 1, EGR, TC

g/s

Varies

MAF Sensor

Eng 1, EGR

Volts

Varies

Main Injection Fuel Rate

DPF

mm³

Varies

Main Injection Timing

Eng 1, Eng 2, FS

degrees

1-1.5

MIL Command

Eng 1

ON/OFF

OFF

Particulate Filter Pressure

DPF

kPa

0

PCM Reset

Eng 1

Yes/No

No

PNP Switch

Eng 1

Applied/Released

Released

Post Injection Fuel Rate

DPF

mm³

Varies

Power Relay Status

Eng 1

ON/OFF

OFF

Pre-Injection Fuel Rate

DPF

mm³

Varies

PTO Enable

Eng 1

Yes/No

No

PTO Engage Relay Command

Eng 1

ON/OFF

OFF

PTO Engine Shutdown Signal

Eng 1

Yes/No

No

PTO Feedback Signal

Eng 1

Relay ON/Relay OFF

Relay OFF

Reverse Enable

Eng 1

Yes/No

No

Starter Relay Command

Eng 1

ON/OFF

OFF

Start up ECT

Eng 1, FS

°C/°F

Varies

Stoplamp Pedal Switch

Eng 1

Applied/Released

Released

TC Vane Learned Open Position

TC

Counts

Varies

TC Vane Position Control Solenoid

TC

Amps

Varies

TC Vane Position Control Solenoid

TC

% Duty Cycle

Varies

TC Vane Position Sensor

EGR, TC

%

Varies

TC Vane Position Sensor

TC

Volts

0-5 Volts

Two Speed Axle Switch

Eng 1

ON/OFF

OFF

Vehicle Speed Sensor

Eng 1, FS, EGR, TC, DPF

mph/km/h

0

Wait To Start

Eng 1

ON/OFF

OFF