GM Service Manual Online
For 1990-2009 cars only

Use the scan tool data listed in this table for comparison after performing the Powertrain On-Board Diagnostic System Check and finding the on-board diagnostics function properly with no diagnostic codes displayed. Not all parameters will apply to each vehicle. Use only the parameters which apply to your particular vehicle.

The typical scan tool data values are an average of the display values recorded from normally operating vehicles. The typical scan tool data values represent the values that a system that is functioning normally should display. The values you get may vary due to a low battery charge or other reasons, but they should be very similar to the typical values provided in the following list.

Do not use a scan tool that displays erroneous data. Report the problem to the manufacturer. The use of a faulty scan tool can result in misdiagnosis and unnecessary parts replacement.

Use only the parameters listed in the tables for diagnosis.

Scan Tool Data Display

Engine at Operating Temp/Engine Idling in Closed Loop/Closed Throttle/Park or Neutral/Accessories OFF

Scan Position

Data List

Units Displayed

Typical Data Value

1-2 Solenoid

ENG 2

ON/OFF

ON

2-3 Solenoid

ENG 2

ON/OFF

ON

3-2 Downshift Solenoid

ENG 2

ON/OFF

ON

4WD

ENG 2

Enable/Disable

Enable

4WD Low

ENG 2

Enable/Disable

Disable

A/C Evaporator Switch

ENG 2

Open/Closed

Closed

A/C Sec. High Pres. Switch

ENG 2

Open/Closed

Open

A/C Relay

ENG 2, Misfire

ON/OFF

OFF

A/C Request

ENG 2, Misfire

YES/NO

NO

Actual EGR Position

ENG 1, 2, HO2S

%

0%

AIR Pump Relay

HO2S

Volts

OFF

Air Fuel Ratio

ENG 1, HO2S

Ratio

14.7:1

BARO

ENG 1, 2, EVAP

Volts

4.76 Volts

BARO

ENG 1, 2, EVAP

kPa

101 kPa

Brake Switch

ENG 2, HO2S, Misfire

Applied/Released

Released

CL Since Restart

ENG 2, HO2S

YES/NO

YES

Clutch Pedal Switch

ENG 2, Misfire

Applied/Released

Released

CMP Retard

ENG 1

Degrees

0°-2°

Cruise

ENG 2

Enable/Disable

Disable

Cycles of Misfire Data

Misfire

Counts

Varies

Decel Fuel Mode

ENG 2

Active/Inactive

Inactive

Desired EGR Position

ENG 1, 2, HO2S

%

0%

Desired IAC Position

ENG 1, 2, HO2S

Counts

18 Counts

Desired Idle Speed

ENG 1, 2, HO2S, EVAP

RPM

650 RPM

DTC Set This Ignition

ENG 2, HO2S, Misfire

YES/NO

NO

ECT

ENG 1, 2, EVAP, HO2S, Misfire

Degrees

93°C (200°F)

ECT Sensor

ENG 1, 2, HO2S

Volts

2.00 volts

EGR Duty Cycle

ENG 1, 2, HO2S

%

0%

EGR Sensor

ENG 1

Volts

0.64 Volts

Engine Load

ENG 1, 2, EVAP, HO2S, Misfire

%

2% idle

11%@2500 RPM

Engine Run Time

ENG 1, 2, EVAP, HO2S, Misfire

Hr/Min/Sec

Varies

Engine Speed

ENG 1, 2, EVAP, HO2S, Misfire

RPM

650 RPM

EVAP Canister Purge

ENG 1, 2, EVAP, HO2S

ON/OFF

ON

EVAP Duty Cycle

ENG 1, 2, EVAP, HO2S

%

17%

EVAP Vent Solenoid

ENG 2, EVAP

Open/Closed

Open

Excess Vacuum Test

EVAP

Pass/Not R/F

Pass

Fuel Level

ENG 2, EVAP

%

Varies

Fuel Level Sensor

EVAP

Volts

Varies

Fuel Tank Pressure

EVAP

In H2O

Varies

Fuel Tank Vacuum Pres.

ENG 2, EVAP

Volts

Varies

Fuel Trim Cell

ENG 1, EVAP, HO2S

Cell

Cell 17

Fuel Trim Enable

ENG 1, 2, HO2S

YES/NO

YES

HO2S Bank 1 Sensor 1

HO2S

mV

Varies

HO2S Bank 1 Sensor 2

HO2S

mV

Varies

HO2S Bank 1 Sensor 3

HO2S

mV

Varies

HO2S Bank 2 Sensor 1

HO2S

mV

Varies

HO2S Bank 2 Sensor 2

HO2S

mV

Varies

HO2S XCounts Bank 1

HO2S

Counts

Varies

HO2S XCounts Bank 2

HO2S

Counts

Varies

HVAC in Recirculation Mode

ENG 2

YES/NO

NO

IAC Position

ENG 1, 2, HO2S

Counts

Varies

IAT

ENG 1, 2, EVAP

Degrees

Varies

IAT Sensor

ENG 1

Volts

Varies

Ignition 1

ENG 1, 2

Volts

13.5 Volts

Ignition 1 Low

ENG 2

YES/NO

NO

Ignition 1 High

ENG 2

YES/NO

NO

Ignition 1 On

ENG 2

YES/NO

YES

Inj. PWM. Average B1

ENG 2, HO2S, Misfire

ms

3.6 ms

Inj. PWM. Average B2

ENG 2, HO2S, Misfire

ms

3.6 ms

KS Active Counter

Misfire

Counts

Varies

KS Activity

ENG 1

Counts

Varies

KS Adjust Factor

EVAP, Misfire

Degrees

Knock Retard

ENG 1

Degrees

0°-2°

Knock Sensor

ENG 1

Volts

4.8 Volts

KS Active Counter

Misfire

Counts

0

KS Activity

ENG 1

Counts

Varies

Long Term FT Bank 1

ENG 1, HO2S

Counts

127 Counts

Long Term FT Bank 1

ENG 1, HO2S

%

0%

Long Term FT Bank 2

ENG 1, HO2S

Counts

127 Counts

Long Term FT Bank 2

ENG 1, HO2S

%

0%

Loop Status

ENG 1, EVAP, HO2S

Open Loop/Closed Loop

Closed Loop

MAF

ENG 1, 2, EVAP, HO2S, Misfire

g/s

5.2g/s

MAF Frequency

ENG 1, 2, HO2S

Hz

2520 Hz

MAP

ENG 1, 2, EVAP, HO2S, Misfire

Volts

1.22 Volts

MAP

ENG 1, 2, EVAP, HO2S, Misfire

kPa

33kPa

Mileage Since DTC Cleared

ENG 2, HO2S

Km/Mi

Varies

Misfire Current Cyl. #1

Misfire

Counts

0

Misfire Current Cyl. #2

Misfire

Counts

0

Misfire Current Cyl. #3

Misfire

Counts

0

Misfire Current Cyl. #4

Misfire

Counts

0

Misfire Current Cyl. #5

Misfire

Counts

0

Misfire Current Cyl. #6

Misfire

Counts

0

Misfire History Cyl. #1

Misfire

Counts

0

Misfire History Cyl. #2

Misfire

Counts

0

Misfire History Cyl. #3

Misfire

Counts

0

Misfire History Cyl. #4

Misfire

Counts

0

Misfire History Cyl. #5

Misfire

Counts

0

Misfire History Cyl. #6

Misfire

Counts

0

PCM/VCM in VTD Fail

ENG 2

YES/NO

NO

Pre HO2S

ENG 1, HO2S

Ready/Not Ready

Ready

Post HO2S

ENG 1, HO2S

Ready/Not Ready

Ready

Power Enrichment

ENG 2

Active/Inactive

Inactive

Purge Leak Test

EVAP

Pass/Not Run/Fail

Pass

Reference Pulse Occurred

ENG 1

YES/NO

YES

Rich/Lean Bank 1

ENG 1, 2, EVAP, HO2S

Rich/Lean

Lean

Rich/Lean Bank 2

ENG 1, 2, EVAP, HO2S, Misfire

Rich/Lean

Lean

Short Term FT Bank 1

ENG 1, HO2S

Counts

127 Counts

Short Term FT Bank 1

ENG 1, HO2S

%

0%

Short Term FT Bank 2

ENG 1, HO2S

Counts

127 Counts

Short Term FT Bank 2

ENG 1, HO2S

%

0%

Small Leak Test

EVAP

Pass/Not Run/Fail

Pass

Spark

ENG 1, Misfire

Degrees

21°

Spark Control

ENG 1

Advance/Retard

Retard

Start Up ECT

ENG 1, 2, EVAP, HO2S

Degrees

Varies

Start Up IAT

ENG 1, 2, EVAP

Degrees

Varies

TCC Enable

ENG 2, Misfire

YES/NO

NO

TCC Duty Cycle

ENG 2, Misfire

%

0%

TFP SW. A/B/C

ENG 2

ON/OFF

OFF/ON/OFF

Total Misfire Current Count

Misfire

Counts

Varies

Total Misfire Failures

Misfire

Counts

Varies

Total Misfire Passes Since First Failure

Misfire

Counts

0

TP Angle

ENG 1, 2, EVAP, HO2S, Misfire

%

0%

TP Sensor

ENG 1, 2, EVAP, HO2S

Volts

0.55 Volts

TR Switch

ENG 2

Drive/Neutral

Drive

Valid Ref. Pulse Occurred

ENG 1

YES/NO

YES

Vehicle Speed

ENG 1, 2, HO2S, Misfire

km/h, mph

0 mph

VTD Auto Learn Timer

ENG 2

Inactive/Active

Inactive

VTD Fuel Disable

ENG 2

Inactive/Active

Inactive

VTD Fuel Disable Until Ign. OFF

ENG 2

YES/NO

NO

Weak Vacuum Test

EVAP

Pass/Not Run/Fail

Pass