GM Service Manual Online
For 1990-2009 cars only
Table 1: BCM
Table 2: IPC
Table 3: Powertrain Control Module (PCM)/Engine Control Module (ECM)

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.

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 HVAC DATA

Volts

Varies

Door Ajar Switch

BCM Entry Control Data

Door Closed/Door Ajar

Door Closed

Driver Door Ajar Switch

BCM Entry Control Data

Door Closed/Door Ajar

Door Closed

Key In Ignition Cylinder Switch

BCM Power Mode Data

Yes/No

Yes

Park Lamp Switch

BCM Lighting Data

On/Off

Off

Trunk Ajar Switch

BCM Entry Control Data

Trunk Closed/Trunk Ajar

Trunk Ajar

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

Powertrain Control Module (PCM)/Engine Control Module (ECM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Engine Idling/Normal Operating Temperature

Cruise Control Active

PCM IPC Data

Yes/No

No

Cruise Control Active

ECM IPC Data

Inactive/Active/Invalid

Inactive

Change Engine Oil Indicator Command

ECM IPC Data

Off/On

Off

ECT Sensor

PCM/ECM IPC Data

Celsius (Fahrenheit)

85-105°C (185-220°F)

Engine Oil Level Switch

ECM IPC Data

Ok/Off

Off

Engine Oil Life Remaining

PCM/ECM IPC Data

%

0-100%

Varies

Engine Oil Pressure Sensor

ECM IPC Data

kPa (psi)

Varies w/oil pressure

Engine Oil Pressure Sensor

ECM IPC Data

0-5 Volts

Varies w/oil pressure

Engine Oil Pressure Switch

PCM/ECM IPC Data

OK/Low

OK

Engine Oil Temperature Calculated

ECM IPC Data

Celsius (Fahrenheit)

Varies w/oil temperature

Engine Speed

PCM/ECM IPC Data

RPM

±100 RPM from Desired Idle Speed

Fuel Level Sensor

PCM/ECM IPC Data

Volts

Varies

Fuel Tank Level Remaining

PCM/ECM IPC Data

Percent (%)

0-100%

Varies

Generator Lamp Command

PCM IPC Data

Off/On

Off

Ignition 1 Signal

PCM/ECM IPC Data

Volts

Varies

Ignition Accessory Signal

PCM/ECM IPC Data

Off/On

Off

Low EOP Indicator Command

ECM IPC Data

Off/On

Off

Low Engine Oil Level Indicator Command

ECM IPC Data

Off/On

Off

MIL Circuit History

PCM IPC Data

Ok/High/ Low

Ok

MIL Circuit Status

ECM IPC Data

Incomplete/Short GND/Open/Short B+/Ok

Ok

MIL Command

PCM/ECM IPC Data

Off/On

Off

Vehicle Speed Sensor

PCM/ECM IPC Data

kph (mph)

0 kph (0 mph)