GM Service Manual Online
For 1990-2009 cars only
Table 1: Body Control Module (BCM)
Table 2: Instrument Panel Cluster (IPC)
Table 3: Engine Control Module (ECM) (2.2L and 3.5L)
Table 4: Engine Control Module (ECM) (3.9 L)

The scan tool data lists contain all the instrument panel, gages, 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 the Diagnostic System Check - Vehicle .

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.

Body Control Module (BCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF/Seat Belt Buckled/High Beams OFF/Park Brake Unapplied

Driver Door Ajar Switch

BCM Keyless/Remote Start Data

Door Closed/Door Ajar

Door Closed

Key In Ignition Cylinder Switch

BCM Power Moding Data

Yes/No

Yes

Park Lamp Switch

BCM Lighting Data

On/Off

Off

Instrument Panel Cluster (IPC)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF/Seat Belt Buckled/High Beams OFF/Park Brake Unapplied

Battery Voltage Signal

IPC

Volts

Varies

Chime

IPC

On/Off

Off

Ignition Status

IPC

On/Off

Off

Engine Control Module (ECM) (2.2L and 3.5L)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Engine Idling/Normal Operating Temperature

Cruise Control Active

ECM

Yes/No

No

ECT Sensor

ECM

Celsius (Fahrenheit)

85-105°C (185-220°F)

Engine Oil Life Remaining

ECM

%

0-100%

Varies

Engine Oil Pressure Switch

ECM

OK/Low

OK

Engine Speed

ECM

RPM

±100 RPM from Desired Idle Speed

Fuel Level Sensor

ECM

Volts

Varies

Fuel Tank Level Remaining

ECM

%

0-100%

Varies

Generator Lamp Command

ECM

On/Off

Off

Ignition 1 Signal

ECM

Volts

Varies

Ignition Accessory Signal

ECM

On/Off

Off

MIL Circuit History

ECM

OK/High/Low

OK

MIL Circuit Status

ECM

OK/High/Low

OK

MIL Command

ECM

On/Off

Off

Non-Driven Wheel Speed

ECM

km/h (mph)

0 km/h (0 mph)

Odometer

ECM

kilometers (miles)

Varies

Reduced Engine Power

ECM

On/Off

Off

Vehicle Speed Sensor

ECM

km/h (mph)

0 km/h (0 mph)

Engine Control Module (ECM) (3.9 L)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Engine Idling/Normal Operating Temperature

Change Engine Oil Indicator Command

ECM

On/Off

Off

Cruise Control Active

ECM

Yes/No

No

ECT Sensor

ECM

Celsius (Fahrenheit)

85-105°C (185-220°F)

Engine Oil Level Switch

ECM

Ok/Low

Ok

Engine Oil Life Remaining

ECM

%

0-100%

Varies

Engine Oil Pressure Sensor

ECM

kPa (psi)

Varies w/oil pressure

Engine Oil Pressure Sensor

ECM

Volts

Varies w/oil pressure

Engine Oil Temperature Calculated

ECM

Celsius (Fahrenheit)

Varies w/oil Temperature

Engine Speed

ECM

RPM

±100 RPM from Desired Idle Speed

Fuel Level Sensor

ECM

Volts

Varies

Fuel Tank Level Remaining

ECM

%

0-100%

Varies

Ignition 1 Signal

ECM

Volts

Varies

Ignition Accessory Signal

ECM

On/Off

Off

Low Engine Oil Level Indicator Command

ECM

On/Off

Off

Low EOP Indicator Command

ECM

On/Off

Off

MIL Circuit Status

ECM

OK/High/Low

Ok

MIL Command

ECM

On/Off

Off

Vehicle Speed Circuit Status

ECM

Incomplete/Short Gnd/Open/Short to B+/Ok

Ok

Vehicle Speed Sensor

ECM

km/h (mph)

0 km/h (0 mph)