GM Service Manual Online
For 1990-2009 cars only

The scan tool data lists contain all of the power take-off (PTO) 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.

Power Take-Off (PTO) Control Module

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/PTO Disengaged

End Model Part Number

Module ID Information

Numeric

Varies

Engine Speed

Data Display

RPM

Varies

Ignition 1 Signal

Data Display

Volts

Varies

PTO Disengage Reason

Data Display

None / Speed Range / Low Speed / High Speed / Eng. Not Running / Switch / Invalid Signal / Cruise / Not Normalized / Trans. Torque / Vehicle Speed / In Gear / Park Brake / Shutdown / DTC Present

Last reason why PTO was disengaged

PTO Indicator

Data Display

On / Off

Off

PTO Inhibit Reason

Data Display

None / Release Brake / Clutch / Engine Speed / Brake / Cruise / In Gear / Park Brake / Vehicle Speed / Switch / Trans. / Trans. Torque / Wheel Speed / Not Pass

Reason why PTO is currently inhibited

PTO In Cab Switch

Data Display

PTO Off / PTO On / Set 1 / Set 2 / No Action / Invalid / Indeterminate

PTO Off

PTO In Cab Switch A

Data Display

%

Numeric

PTO In Cab Switch B

Data Display

%

Numeric

PTO In Cab Switch C

Data Display

%

Numeric

PTO Option

Data Display

Enhanced / Disable / Preset / Variable / Mobile / Fast Idle

Disable

PTO Relay Indicator

Data Display

On / Off

Off

PTO Remote Accelerator Sensor (If Equipped)

Data Display

%

Numeric

PTO Remote Switch Status

Data Display

PTO Off / PTO On / Set 1 / Set 2 / No Action / Invalid / Indeterminate

PTO Off

PTO Status

Data Display

Disabled / Standby Disabled / Standby Pending / PTO Standby / PTO Active / Reserved / PTO Set / PTO Coast / Reserved / PTO Accelerate / Shutdown / No Action

No

Requested Engine Speed

Data Display

RPM

Varies

Software Part Number

Module ID Information

Numeric

Varies

Vehicle Speed

Data Display

km/h (mph)

Varies