GM Service Manual Online
For 1990-2009 cars only
Table 1: BCM
Table 2: IPC
Table 3: PCM

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 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.

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

Ambients Air Temperature Sensor

BCM

Volts

Varies

DIC Switch

BCM

Clear/Info./Menu/Reset

Clear

Driver Door Ajar Switch

BCM

Door Closed/Door Ajar

Door Closed

Key In Ignition Cylinder Switch

BCM

Yes/No

Yes

Park Lamp Switch

BCM

On/Off

Off

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

PCM

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Engine Idling/Normal Operating Temperature

Cruise Control Active

PCM

Yes/No

No

ECT Sensor

PCM

Celsius (Fahrenheit)

85-105°C (185-220°F)

Engine Oil Life Remaining

PCM

%

0-100%

Varies

Engine Oil Pressure Switch

PCM

OK/Low

OK

Engine Speed

PCM

RPM

±100 RPM from Desired Idle Speed

Fuel Level Sensor

PCM

Volts

Varies

Fuel Tank Level Remaining

PCM

%

0-100%

Varies

Generator Lamp Command

PCM

On/Off

Off

Ignition 1 Signal

PCM

Volts

Varies

MIL Circuit History

PCM

OK/High/ Low

OK

MIL Command

PCM

On/Off

Off

Vehicle Speed Sensor

PCM

kph (mph)

0 kph (0 mph)