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

RPM

Same as engine speed

DTC P1374 3X Reference Circuit

24X Crank Sensor

RPM

Same as engine speed, up to 1600 RPM

DTC P0336 CKP Sensor Circuit Performance

Abuse Management

Active / Inactive

Inactive

Automatic Transaxle Diagnosis

A/C High Side

Pressure / Volts

Varies with refrigerant temperature

PCM Controlled Air Conditioning Diagnosis

A/C OFF For WOT

Yes / No

No

PCM Controlled Air Conditioning Diagnosis

A/C Pressure Disable

Yes / No

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

PCM Controlled Air Conditioning Diagnosis

A/C Request

Yes / No

No (Yes with A/C ON)

PCM Controlled Air Conditioning Diagnosis

Actual EGR Position

Percent

0%

EGR System Description

Air/Fuel Ratio

Ratio

14.2:1-14.7:1

Fuel Metering Modes of Operation

BARO

Volts / kPa

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

Information Sensors Description

Brake Switch

Applied / Released

Released

Transaxle Diagnosis

Cam Signal Present

Yes / No

Yes

Information Sensors Description

DTC P0341 CMP Sensor Circuit Performance

Commanded A/C

ON / OFF

OFF (ON with A/C requested)

PCM Controlled Air Conditioning Diagnosis

Commanded Fuel Pump

ON / OFF

ON

Fuel Pump Relay Circuit Diagnosis

Commanded Gen

ON / OFF

ON

DTC P0560 System Voltage

Cruise Mode

ON / OFF

OFF

Information Sensors Description

Cruise Inhibited

Yes / No

Yes

DTC P1662 Cruise Control Inhibit Control Circuit

Current Gear

1 / 2 /3 / 4

1

Automatic Transaxle Diagnosis

Decel Fuel Mode

Active / Inactive

Inactive

Fuel Metering Modes of Operation

Desired EGR Position

Percent

0%

EGR System Description

Desired Idle Speed

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 Description

EGR Closed Valve Pintle

Volts

0.14-1.0 volt

EGR System Description

EGR Duty Cycle

Percent

0%

EGR System Description

EGR Feedback

Volts

0.14-1.0 volt

EGR System Description

EGR Position Error

Percent

0%-9%

EGR System Description

EGR Flow Test Count

Counts

0-10

EGR System Description

Engine Load

Percent

2%-5% at idle

7%-10% at 2500 RPM

Engine Load

Engine Run Time

Hr: Min: Sec

Depends on time since startup.

Engine Run Time

Engine Speed

RPM

+/-100 RPM from Desired Idle

Information Sensors Description

Idle Air Control System Check

EVAP Canister Purge

Percent

0%-25% (varies)

EVAP Control System Description

EVAP Vent Solenoid

Open / Closed

EVAP Control System Description

Fans Low Speed/ Fans High Speed

ON / OFF

OFF (On with low speed fans running)

Electric Cooling Fan 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 Description

HO2S Sensor 1

Not Ready / Ready

Ready

Information Sensors Description

HO2S Sensor 1

millivolts

0-1000, constantly varying

Information Sensors Description

HO2S Sensor 2

millivolts

0-1000, varies

Information Sensors Description

HO2S XCount

millivolts

Varies

--

Hot Mode

ON / OFF

OFF

Transaxle Diagnosis

IAC Position

Counts

10-40

Idle Air Control System Check

IAT

°C, °F

Varies with ambient air temperature.

Information Sensors Description

Ignition 1

Volts

13 (Varies)

DTC P0560 System Voltage

Ignition Mode

IC/Bypass

IC with ICM controlling timing / Bypass with fixed timing

Electronic Ignition System Description

Injector Status

OK / Stuck High / Stuck Low

OK

DTC P0201-P0206 Injector Control Circuit

Injector Pulse Width

milliseconds

1.5-3.5 (Varies with engine load)

Injector Pulse Width

Knock Retard

Degrees

Knock Sensor System Description

Long Term FT

Percent

-10%-10%

DTC P0171 Fuel Trim System Lean

Loop Status

Open / Closed

Closed

DTC P0125 ECT Excessive Time to Closed Loop

Low Oil Lamp

ON / OFF

OFF

PCM Controlled Warning Lamps Description

MAF

g/s

4-6 gm/s at idle

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

Information Sensors Description

MAF Frequency

Hz

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

PCM Controlled Warning Lamps Description

MAP

kPa / Volts

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

Information Sensors Description

MIL

ON / OFF

OFF

Powertrain OBD System Check

Total Misfire Failures

Counts

0

DTC P0300 OBD System Check

Misfire Current #1-#6

Counts

0-4

DTC P0300 OBD System Check

Misfire History #1-#6

Counts

0

DTC P0300 OBD System Check

Total Misfire Passes (Since First Fail)

Counts

0

DTC P0300 OBD System Check

Non-Volatile

Pass / Fail

Pass

--

Power Enrichment

Active / Inactive

Inactive

Fuel Metering Modes of Operation

Short Term FT

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 Engaged

Engage/ Disengage

No

Transaxle Diagnosis

Total Misfire Current C(ount)

Counts

0-5

DTC P0300 Engine Misfire Detected

TP Angle

Percent

0%

DTC P0123 TP Sensor Circuit High Voltage

TP Sensor

Volts

0.20-0.74

DTC P0123 TP Sensor Circuit High Voltage

Information Sensors Description

Transmission Range

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

Park

Information Sensors Description

TR Switch P A B C

Low / High

Low / Low / High / High

Information Sensors Description

TWC Protection

Active / Inactive

Inactive

Fuel Metering Modes of Operation

Vehicle Speed

MPH, Km/h

0

Automatic Transaxle Diagnosis

VTD Fuel Disable

Active / Inactive

Inactive

DTC P1626

DTC P1629