GM Service Manual Online
For 1990-2009 cars only
Table 1: Body Control Module (BCM)
Table 2: Engine Control Module (ECM)

The scan tool data lists contain all of the cruise control 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 .

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/Vehicle is in Park or Neutral/Cruise On/Off Switch is Turned OFF

Cruise Control Switch

Cruise Control Data

On/Off/Resume/Set/Error/Cancel

Off

Engine Control Module (ECM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine Idling at Normal Operating Temperature/Vehicle is in Park or Neutral/Cruise On/Off Switch is Turned OFF

APP Indicated Angle

Cruise/PTO/Traction Data

Percent

0

BPP Circuit Signal

Cruise/PTO/Traction Data

Applied/Released

Released

BPP Signal

Cruise/PTO/Traction Data

Applied/Released/Invalid

Released

Cruise Cancel Switch

Cruise/PTO/Traction Data

Active/Inactive/Invalid

Inactive

Cruise Control Active

Cruise/PTO/Traction Data

Active/Inactive/Invalid

Inactive

Cruise Disengage (1-8) History

Cruise/PTO/Traction Data

Last reason for cruise control disengagement

Varies

Cruise On/Off Switch

Cruise/PTO/Traction Data

On/Off

Off

Cruise Resume/Accel. Switch

Cruise/PTO/Traction Data

Active/Inactive/Invalid

Inactive

Cruise Set/Coast Switch

Cruise/PTO/Traction Data

Active/Inactive/Invalid

Inactive

Engine Run Time

Cruise/PTO/Traction Data

Hr: Min: Sec

Varies

Engine Speed

Cruise/PTO/Traction Data

RPM

Varies

Ignition 1 Signal

Cruise/PTO/Traction Data

Volts

12-16 Volts

TP Desired Angle

Cruise/PTO/Traction Data

Percent

Varies

TP Indicated Angle

Cruise/PTO/Traction Data

Percent

%

Vehicle Speed Sensor

Cruise/PTO/Traction Data

km/h (mph)

0 km/h (0 mph)