GM Service Manual Online
For 1990-2009 cars only

Scan Tool Output Control

Additional Menu Selection(s)

Description

A/C Relay

Engine Output Controls

Activates the A/C relay ON or OFF. The Device Control will not change unless changed or cancelled by the scan tool. The Device Control will not change unless changed or cancelled by the scan tool.

Cylinder Power Balance

Fuel System

Disables each injector. The Device control will not change unless changed or cancelled by the scan tool. Device Control can be changed at any engine or vehicle speed.

Exhaust Brake Control

Engine Output Controls

Activates the exhaust brake relay - ON or OFF. The Device Control will not change unless changed or cancelled by the scan tool.

Fuel Pressure Control

Fuel System

Activates the Fuel Pressure Regulator in 10% increments from 0% to 100%. The Device Control will not change unless changed or cancelled by the scan tool.

Fuel Pump

Engine Output Controls

Activates the fuel transfer pump ON or OFF. The Device Control will not change unless changed or cancelled by the scan tool.

FRP Regulator Relay

Engine Output Controls

Activates the FRP Regulator Relay - ignition 1 relay - ON or OFF. The Device Control will not change unless changed or cancelled by the scan tool. DTC U1800 may set when turning the relay OFF.

Glow Plug

Engine Output Controls

Activates the Glow Plug Relay (ignition 1 relay) ON or OFF. The Device Control will be aborted after 12 seconds for the first activation, and after 5 seconds for every other activation. Device control is inhibited if the engine is running.

Intake Air Heater

Engine Output Controls

Activates the intake air heater relay ON or OFF. The Device Control will not change unless changed or cancelled by the scan tool.

Malfunction Indicator Lamp

Engine Output Controls

Activates the malfunction indicator lamp. The MIL will remain illuminated until cancelled by the scan tool.

Oil Life Reset

Engine Output Controls

Resets the Oil Life Index.

PTO Relay

Engine Output Controls

Activates the PTO relay ON or OFF. The Device Control will not change unless changed or cancelled by the scan tool.

RPM Control

Fuel System

Adjusts the engine speed in 25, 100, or 500 RPM increments. Device Control will not change unless changed or cancelled by the scan tool.

Speed Cal. Programming

Engine Output Controls

Enables the technician to program vehicle specific tire size and axle ratio calibrations into the ECM without reprogramming the entire ECM.