GM Service Manual Online
For 1990-2009 cars only
Table 1: Engine Control Module (ECM) - 4.6L
Table 2: Engine Control Module (ECM) - 3.6L (LY7)
Table 3: HUD (4.6L and 3.6L LY7)
Table 4: Instrument Panel Cluster (IPC) 4.6L and 3.6L (LY7)

The scan tool data lists contain all the instrument panel, gage, and console related parameters that are available on the scan tool. The parameters in the list are arranged in alphabetical order. The data list column indicates the location of the parameter within the scan tool menu selections.

Use the scan tool data lists as directed by a diagnostic table or in order to supplement the diagnostic procedures. Begin all of the diagnostic procedures with Diagnostic System Check - Vehicle in Vehicle DTC Information.

Use the scan tool data lists only after the following is determined:

    • There is no published DTC procedure nor published symptom procedure for the customer concern.
    • The DTC or symptom procedure indicated by the diagnostic system check does not resolve the customer concern.

The typical data values are obtained from a properly operating vehicle under the conditions specified in the first row of the scan tool data list table. Comparison of the parameter values from the suspect vehicle with the typical data values may reveal the source of the customer concern.

Engine Control Module (ECM) - 4.6L

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Engine Idling/Normal Operating Temperature

Cruise Control Active

IPC ECM Data

No / Yes

No

Commanded Gear

IPC ECM Data

Shift, 1st, 2nd, 3rd, 4th, 5th, Invalid, Invalid, Reverse, Neutral, Park

Park

ECT Sensor

IPC ECM Data

°C (°F)

85-105°C (85-220°F)

Engine Oil Pressure Sensor

IPC ECM Data

Volts

Varies w/oil pressure

Engine Oil Pressure Sensor

IPC ECM Data

kPa (psi)

Varies w/oil pressure

Engine Oil Temperature

IPC ECM Data

°C (°F)

Varies w/oil temperature

Engine Speed

IPC ECM Data

RPM

±100 RPM from Desired Idle Speed

Fuel Level Sensor - Left Tank

IPC ECM Data

Volts

Varies w/fuel level

Fuel Level Sensor - Right Tank

IPC ECM Data

Volts

Varies w/fuel level

Fuel Tank Level Remaining

IPC ECM Data

Liters (Gallon)

Varies w/fuel level

GEN L - Terminal

IPC ECM Data

Off / On

On

Ignition 0 Signal

IPC ECM Data

Off / On

On

Ignition 1 Signal

IPC ECM Data

Volts

9 - 16 Volts (varies)

Malfunction Indicator Lamp (MIL) Circuit Status

IPC ECM Data

Fault

Off

Malfunction Indicator Lamp (MIL) Command

IPC ECM Data

Off / On

Off

Vehicle Speed Sensor

IPC ECM Data

Kilometers per hour (Miles per hour)

0 Km/h (0 mph)

Engine Control Module (ECM) - 3.6L (LY7)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Engine Idling/Normal Operating Temperature

Cruise Control Active

IPC ECM Data

No / Yes

No

Current Gear

IPC ECM Data

P/N, 1st, 2nd, 3rd, 4th, 5th, Reverse

P/N

ECT Sensor

IPC ECM Data

°C / °F

85-105°C (85-220°F)

Engine Oil Level Switch

IPC ECM Data

OK / Low

OK

Engine Oil Life Remaining

IPC ECM Data

%

0-100%

Varies

Engine Oil Pressure Sensor

IPC ECM Data

OK / Low

OK

Engine Oil Pressure Sensor

IPC ECM Data

kPa (psi)

Varies w/oil pressure

Engine Speed

IPC ECM Data

RPM

±100 RPM from Desired Idle Speed

Fuel Level Sensor - Left Tank

IPC ECM Data

Volts

Varies w/fuel level

Fuel Level Sensor - Right Tank

IPC ECM Data

Volts

Varies w/fuel level

Fuel Tank Level Remaining

IPC ECM Data

Liters (Gallon)

Varies w/fuel level

Ignition 0 Signal

IPC ECM Data

Off / On

On

Ignition 1 Signal

IPC ECM Data

Off / On

On

Reduced Engine Power

IPC ECM Data

Inactive / Active

On

Vehicle Security Status

IPC ECM Data

Fuel Continued

Disable Timeout

Disable Ign. Off

Key Timer Active

VTD Fail Enable

Learn Enable

Fuel Continued

Vehicle Speed Sensor

IPC ECM Data

Kilometers per hour (Miles per hour)

0 Km/h (0 mph)

HUD (4.6L and 3.6L LY7)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF

Adjust Display Down Switch

IPC HUD Data

Inactive / Active

Inactive

Adjust Display Up Switch

IPC HUD Data

Inactive / Active

Inactive

Ambient Light Sensor

IPC HUD Data

--

--

Auto. Trans. Equipped

IPC HUD Data

No / Yes

No

Battery Voltage Signal

IPC HUD Data

Volts

9-16 Volts (varies)

Display Dimming Signal

IPC HUD Data

Volts

Varies

Display Dimming

IPC HUD Data

%

0-100% (varies)

English / Metric Status

IPC HUD Data

English / Metric

Metric

Ignition Cycle Counter

IPC HUD Data

Counts

Varies w/ignition cycles

Speed Biasing Status

IPC HUD Data

Disabled / Enabled

Disabled

Instrument Panel Cluster (IPC) 4.6L and 3.6L (LY7)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF/Park Brake Unapplied

Battery Voltage Signal

IPC Data

Volts

9-16 Volts

Brake Fluid

IPC Data

OK/Low

OK

Brake Fluid Switch

IPC Data

Volts

Varies w/fluid level

English / Metric Switch

IPC Data

Inactive / Active

Inactive

Engine Speed Signal

IPC Data

RPM

0 RPM

Gage Backlight Dimming

IPC Data

%

Varies

Ignition 1 Input

IPC Data

Inactive / Active

Active

Ignition Cycle Counter

IPC Data

Counts

Varies

Indicator Dimming

IPC Data

%

Varies

Information Down Switch

IPC Data

Inactive / Active

Inactive

Information Reset Switch

IPC Data

Inactive / Active

Inactive

Information Up Switch

IPC Data

Inactive / Active

Inactive

LCD Dimming

IPC Data

%

Varies

Pointer Dimming

IPC Data

%

Varies

PRNDL State

IPC Data

Invalid, First Gear, Second Gear, Third Gear, Fourth Gear, Fifth Gear, Reverse, Neutral, Park, Drive, Not Available

Park

Trip Odometer A / B Switch

IPC Data

Inactive / Active

Inactive

Trip Reset Switch

IPC Data

Inactive / Active

Inactive

Vehicle Speed

IPC Data

km/h (mph)

km/h (mph)