GM Service Manual Online
For 1990-2009 cars only

Typical Scan Tool Data Values

Scan Tool Parameter

Units Displayed

Typical Data Value

Reference

3X Crank Sensor Scan Data Display and Definition - 60 Degree

RPM

Same as engine speed, above 1280 RPM

DTC P1374 Crankshaft Position (CKP) High to Low Resolution Frequency Correlation

24X Scan Data Display and Definition - 60 Degree

RPM

Sam as engine speed, up to 1280 RPM

DTC P0336 Crankshaft Position (CKP) Sensor Performance

Abuse Management Scan Data Display and Definition - 60 Degree

Active / Inactive

Inactive

4T60-E Automatic Transaxle Diagnosis

A/C Clutch Scan Data Display and Definition - 60 Degree

Yes / No

No (Yes with A/C Compressor engaged)

PCM Controlled Air Conditioning

A/C High Side SCAN Data Display and Definition - 60 Degree

PSI

Varies with refrigerant temperature

PCM Controlled Air Conditioning

A/C Off For WOT

Yes / No

No

PCM Controlled Air Conditioning

A/C PSI Disable Scan Data Display and Definition - 60 Degree

Yes / No

No (Yes with low or high A/C refrigerant pressure)

PCM Controlled Air Conditioning

A/C Request

Yes / No

No (Yes with A/C ON)

PCM Controlled Air Conditioning

Actual EGR Position

Percent

0%

DTC P1406 Exhaust Gas Recirculation (EGR) Position Sensor Performance

Air/Fuel Ratio

Ratio

14.2:1-14.7:1

Fuel Metering Modes of Operation

Air Pump Scan Data Display and Definition

On / Off

Off (On during Open loop fuel control - Cold Start/Hot restart

Secondary Air Injection System Description

DTC P0410 Secondary Air Injection (AIR) System

AIR Active Test Scan Tool Data

Active / Inactive

Inactive (Active with failed AIR Passive Test

Secondary Air Injection System Description

DTC P0410 Secondary Air Injection (AIR) System

BARO

kPa

65-110 (Depends on altitude and barometric pressure).

Information Sensors

CAM SIG Present Scan Data Display and Definition - 60 Degree

Yes / No

Yes

Information Sensors

DTC P0341 Camshaft Position (CMP) Sensor Performance

Commanded Fan 1/Commanded Fan 2

On / Off

Off (On with low speed fans running)

Electric Cooling Fan

Commanded Fan 1/Commanded Fan 2

On / Off

Off (On with high speed fans running)

Electric Cooling Fan

Commanded Gen

On / Off

On

DTC P0560 System Voltage

Cruise Engaged

Yes / No

No

Stepper Motor Cruise Control Module Gen Desc.

Cruise Inhibited

Yes / No

Yes

Stepper Motor Cruise Control Module Gen Desc.

Current Gear

1 / 2 /3 / 4

1

4T60-E Automatic Transaxle Diagnosis

Decel Fuel Mode

Active / Inactive

Inactive

Fuel Metering Modes of Operation

Desired EGR Position

Percent

0%

DTC P1406 Exhaust Gas Recirculation (EGR) Position Sensor Performance

Desired Idle

RPM

PCM commanded idle speed (varies with temperature).

Idle Air Control System Check

ECT

°C, °F

85°C-105°C / 185°F-220°F (varies with temperature).

Information Sensors

EGR Closed Valve Pintle Position

Volts

0.14-1.0 volt

DTC P1406 Exhaust Gas Recirculation (EGR) Position Sensor Performance

EGR Duty Cycle

Percent

0%

DTC P1406 Exhaust Gas Recirculation (EGR) Position Sensor Performance

EGR Feedback

Volts

0.14-1.0 volt

DTC P1406 Exhaust Gas Recirculation (EGR) Position Sensor Performance

EGR Position Error

Percent

0%-9%

DTC P1406 Exhaust Gas Recirculation (EGR) Position Sensor Performance

EGR Test Count

Counts

0-10

DTC P1406 Exhaust Gas Recirculation (EGR) Position Sensor Performance

Engine Load

Percent

2%-5% at idle

7%-10% at 2500 RPM

Engine Load

Oil Level

OK / Low

OK

Engine Oil Level Sensor Diagnosis

Engine Run Time

Hr: Min: Sec

Depends on time since startup.

Engine Run Time

Engine Speed

RPM

±100 RPM from Desired Idle

Information Sensors

Idle Air Control System Check

EVAP Purge PWM

Percent

0%-25% (varies)

EVAP Control System

EVAP Vacuum Switch

Purge / No Purge

No Purge (Purge if over 25% EVAP Purge PWM is commanded).

EVAP Control System

Fuel Pump

On / Off

On

Fuel Pump Electrical Circuit Diagnosis

Fuel Trim Cell

Cell #

0

DTC P0172 Fuel Trim System Rich

Fuel Trim Learn

Disabled / Enabled

Enabled

Fuel Trim Learn

Generator Lamp

On / Off

Off

PCM Controlled Warning Lamps

HO2S Sen. 1

Not Ready / Ready

Ready

Information Sensors

HO2S Sen. 1

millivolts

0-1000, constantly varying

Information Sensors

HO2S Sen. 2

mIllivolts

0-1000,varies

Information Sensors

HO2S XCount

Counts

Varies

--

IAC Position

Counts

10-40

Idle Air Control System Check

IAT

°C, °F

Varies with ambient air temperature.

Information Sensors

Ignition 1

Volts

13 (Varies)

DTC P0560 System Voltage

IGN Bypass Scan Data Display and Definition - 60 Degree

Active / Inactive

Inactive (Active with Ignition Control Module Controlling ignition timing)

Electronic Ignition (EI) System

IC Mode Scan Data Display and Definition - 60 Degree

Active / Inactive

Active (Inactive with Ignition Control Module Controlling ignition timing)

Electronic Ignition (EI) System

Injector Fault Scan Data Display and Definition - 60 Degree

Yes / No

No

DTC P1200 Injector Control Circuit

Injector Pulse Width

milliseconds

1.5-3.5 (Varies with engine load)

Injector Pulse Width

KS Activity

Yes / No

No

Knock Sensor (KS) System

KS Noise Channel

Volts

0.1-3.0 (varies)

Knock Sensor (KS) System

Knock Retard

Degrees

Knock Sensor (KS) System

Long Term Fuel Trim

Percent

-10%-10%

DTC P0171 Fuel Trim System Lean

Loop Status

Open / Closed

Closed

DTC P0125 Engine Coolant Temperature (ECT) Excessive Time to Closed Loop Fuel Control

Low Oil Lamp Scan Data Display and Definition

On / Off

Off

PCM Controlled Warning Lamps

MAF

gm/s

3-6 gm/s at idle

13-16 gm/s at 2500 RPM (Depends on engine load and barometric pressure)

Information Sensors

MAF Frequency

Hz

1200-3000 (Depends on engine load and barometric pressure).

Information Sensors

MAP

kPa / Volts

25-48 kPa / 1-2 Volts (Depends on engine load and barometric pressure).

Information Sensors

MPH / km/h

MPH, Km/h

0

4T60-E Automatic Transaxle Diagnosis

MIL

On / Off

Off

A Powertrain On Board Diagnostic (OBD) System Check

Misfire Failures Since First Fail

Counts

0

DTC P0300 Engine Misfire Detected

Misfire Cur. #1-#6

Counts

0-4

DTC P0300 Engine Misfire Detected

Misfire Hist. #1-#6

Counts

0

DTC P0300 Engine Misfire Detected

Misfire Passes Since First Fail

Counts

0

DTC P0300 Engine Misfire Detected

Non-Volatile Scan Data Display and Definition - 60 Degree

Pass / Fail

Pass

--

Power Enrichment

Active / Inactive

Inactive

Fuel Metering Modes of Operation

Short Term Fuel Trim

Percent

-10%-10%

DTC P0171 Fuel Trim System Lean

Spark

Degrees

20° (varies)

--

Start Up ECT

°C, °F

Depends on engine coolant temperature at time of startup

--

Start Up IAT

°C, °F

Depends on intake air temperature at time of startup

--

TCC Brake Switch Scan Data Display and Definition

Applied / Released

Released

4T60-E Transaxle Diagnosis

TCC Engaged Scan Data Display and Definition

Yes / No

No

4T60-E Transaxle Diagnosis

Total Misfire Current Count

Counts

0-5

DTC P0300 Engine Misfire Detected

TP Angle

Percent

0%

DTC P0123 Throttle Position (TP) Sensor Circuit High Voltage

TP Sensor

Volts

0.20-0.74

DTC P0123 Throttle Position (TP) Sensor Circuit High Voltage

Information Sensors

Transmission Range

Park / Reverse / Neutral / Drive 4 / Drive 3 / Drive 2 / Low

Park

Information Sensors

TR P A B C

X / 0

0 0 X X

Information Sensors

Trans Hot Mode

Active / Inactive

Inactive

4T60-E Transaxle Diagnosis

TWC Diagnostic

Enabled / Disabled

Enabled

DTC P0420 Catalyst System Low Efficiency

TWC Monitor Test Counter

Counts

0

DTC P0420 Catalyst System Low Efficiency

TWC Protection

Active / Inactive

Inactive

Fuel Metering Modes of Operation

VTD Fuel Disable

Active / Inactive

Inactive

VTD Fuel Disable