GM Service Manual Online
For 1990-2009 cars only
Table 1: Body Control Module (BCM)
Table 2: Driver Information Center (DIC)
Table 3: Powertrain Control Module (PCM)
Table 4: Engine Control Module (PCM)
Table 5: Instrument Panel Cluster (IPC)

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 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.

Body Control Module (BCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF

Key in Ignition

Inputs

Yes/No

Yes

Driver Information Center (DIC)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF

Display Backlighting Level

DIC Data

%

Varies

Display Odometer Switch

Input/Output

Yes/No

Yes

Fuel Switch

Input/Output

Yes/No

Yes

Gauge Switch

Input/Output

Yes/No

Yes

Options Switch

Input/Output

Yes/No

Yes

Reset Switch

Input/Output

Yes/No

Yes

Switch Backlighting

DIC Data

%

Varies

Powertrain Control Module (PCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Engine Idling/Normal Operating Temperature

Change Oil Now Command

IPC PCM Data

On/Off

Off

Cruise Control Active

IPC PCM Data

Yes/No

No

ECT Sensor

IPC PCM Data

Celsius (Fahrenheit)

85-105°C (185-220°F)

Engine Hot Lamp Command

IPC PCM Data

On/Off

Off

Engine Oil Life Remaining

IPC PCM Data

%

Varies

Engine Oil Level Switch

IPC PCM Data

OK/Low

OK

Engine Oil Pressure Switch

IPC PCM Data

OK/Low

OK

Engine Speed

IPC PCM Data

RPM

±100 RPM from Desired Idle Speed

Engine Speed Circuit Status

IPC PCM Data

Ok/Fault/Fault/Invalid State

Ok

Fuel Tank Level Remaining

IPC PCM Data

%

Varies w/fuel level

Fuel Level Sensor

IPC PCM Data

0-5 V

Varies w/fuel level

Generator Lamp Command

IPC PCM Data

On/Off

Off

Ignition 1 Signal

IPC PCM Data

Voltage

9-19 V

Low Engine Oil Level Lamp Command

IPC PCM Data

On/Off

Off

Low EOP Lamp Command

IPC PCM Data

On/Off

Off

MIL Circuit History

IPC PCM Data

Ok/Open/Short/Invalid State

Ok

MIL Command

IPC PCM Data

On/Off

On/Off

Odometer

IPC PCM Data

Miles (Kilometers)

Varies w/selection

Vehicle Speed Sensor

IPC PCM Data

miles per hour (kilometers per hour)

0 mph (0 km/h)

Engine Control Module (PCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Engine Idling/Normal Operating Temperature

Change Engine Oil Indicator Command

IPC ECM Data

On/Off

Off

Cruise Control Active

IPC ECM Data

Inactive/Active/Invalid

Inactive

ECT Sensor

IPC ECM Data

Celsius (Fahrenheit)

85-105°C (185-220°F)

Engine Oil Pressure Sensor

IPC ECM Data

kPa (psi)

Varies w/oil pressure

Engine Oil Pressure Sensor

IPC ECM Data

Volts

0-5 Volts

Varies w/oil pressure

Engine Oil Temperature Calculated

IPC ECM Data

Celsius (Fahrenheit)

Varies w/oil temperature

Engine Speed

IPC ECM Data

RPM

±100 RPM from Desired Idle Speed

Engine Speed Circuit Status

IPC PCM Data

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

Ok

Fuel Level Sensor

IPC ECM Data

0-5 V

Varies w/fuel level

Fuel Tank Level Remaining

IPC ECM Data

%

Varies w/fuel level

Ignition 1 Signal

IPC ECM Data

Voltage

9-18 V

Ignition Accessory Signal

IPC ECM Data

On/Off

Off

Low EOP Indicator Command

IPC ECM Data

On/Off

Off

MIL Circuit Status

IPC ECM Data

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

Ok

MIL Command

IPC ECM Data

On/Off

On/Off

Non-Driven Wheel Speed

IPC ECM Data

miles per hour (kilometers per hour)

0 mph (0 km/h)

Odometer

IPC ECM Data

Miles (Kilometers)

Varies

Miles (Kilometers)

Vehicle Speed Sensor

IPC ECM Data

miles per hour (kilometers per hour)

0 mph (0 km/h)

Instrument Panel Cluster (IPC)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

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

ABS Lamp

Data

On/Off

Off

Air Bag Lamp

Data

On/Off

Off

Brake Lamp

Data

Volts

Varies w/fluid level

Coolant Hot Lamp

Data

On/Off

Varies

Fog Lamp

Data

On/Off

Off

Hi Beam Lamp

Data

On/Off

Off

Km/h Lamp

Data

On/Off

On/Off

Left Turn Signal

Data

On/Off

Off

mph Lamp

Data

On/Off

On/Off

Low Brake Fluid

Data

On/Off

Off

Low Oil Pressure

Data

On/Off

Off

Right Turn Signal

Data

On/Off

Off

Upshift Lamp

Data

On/Off

Off

VSES Active Lamp

Data

On/Off

On/Off