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HOMESERVICE MANUALSCHEVROLET2006SUBURBAN C2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1028 (ENGINE CONTROLS AND FUEL - 4.3L - INTRODUCTION (1 OF 2))SCAN TOOL OUTPUT CONTROLS
2006 Chevrolet Suburban C2500, 6.0 U

Scan Tool Output Controls

2006 Chevrolet Suburban C2500, 6.0 USECTION Scan Tool Output Controls
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Scan Tool Output Controls

Scan Tool Output Control Additional Menu Selection(s) Description
Crankshaft Position Variation Learn - Enables the powertrain control module (ECM) to learn the variations in the crankshaft position (CKP) system. The ECM will learn the variations once the following conditions are met:
  • Engine coolant temperature (ECT) is more than a specified value.
  • All instructions on the scan tool have been completed.
  • The accelerator pedal is smoothly applied until the fuel cut-OFF, as specified on the scan tool, is achieved, and then immediately released.

The ECM learns the variation values on the deceleration from fuel cut-OFF.
Cylinder 1, Cylinder 4, Cylinder 6, Cylinder 7 DoD System This function will enable or disable V8 mode, by energizing or de-energizing each individual, VLOM solenoid either ON or OFF. The normal commanded state is OFF.
Cylinder Deactivation System DoD System This function will enable or disable V4 mode, by energizing or de-energizing all 4 VLOM solenoids, either ON or OFF. The normal commanded state is OFF.
Cylinder Power Balance Fuel System Enables/Disables a cylinder by turning OFF the fuel injector to the cylinder. The fuel injector is normally enabled. The ECM disables the fuel injector when the following conditions are met:
  • All instruction on the scan tool are completed.
  • Stabilized engine speed
  • The fuel injector is selected

When Disable is selected the ECM turns the injector OFF for 30 seconds. During this period, the engine operates with a misfire.
Engine Controls Ignition Relay Engine Output Controls This function will enable or disable the engine controls ignition relay. The scan tool will command the engine controller to turn the relay ON or OFF. The normal commanded state is ON.
Engine Speed Control TAC System Activates the throttle activation control (TAC) system to change engine RPM. The normal commanded state is None. To enable the RPM control, all instruction on the scan tool must be completed. The system will increase or decrease the RPM within a range of 350-2,000 RPM. The set step value changes the RPM by increments of 25 RPM, 100 RPM, and 500 RPM. The system remains in the commanded state until cancelled by the scan tool.
EVAP Purge Solenoid Engine Output Controls/EVAP System Activates the evaporative emission (EVAP) purge valve. The normal commanded state is None. The system will increase or decrease the amount of EVAP purge valve opening by 10 percent increments within a range of 0-100 percent. The system remains in the commanded state until cancelled by the tool or the fuel tank pressure (FTP) exceeds 32 mm Hg (17 in H2O).
EVAP Purge/Seal Engine Output Controls/EVAP System This control enables 2 functions. One function increases or decreases the amount of purge by changing the duty cycle of the purge valve and commanding the vent ON, non-venting. The normal commanded state of both valves is None. The system will increase or decrease the amount of EVAP purge valve opening by 10 percent increments within a range of 0-100 percent. The second function seals the system after using the purge function to obtain a specific amount of FTP. When activated the purge valve is commanded to 0 percent and the vent valve is commanded ON, non-venting. Both functions remain in the commanded state until one of the following conditions occurs:
  • Cancelled by the tool
  • The FTP exceeds 32 mm Hg (17 in H2O)
EVAP Service Bay Test Engine Output Controls/EVAP System Activates the On-board EVAP Diagnostic test.
EVAP Vent Solenoid Engine Output Controls/EVAP System Activates the EVAP vent solenoid. The normal commanded state is None. When commanded ON, the vent valve switches to non-venting. The system remains in the commanded state until one of the following conditions occurs:
  • Cancelled by the tool
  • Purge is greater than 0 percent, and the fuel tank pressure exceeds 32 mm Hg (17 in H2O).
Fuel Composition Reset Fuel System
IMPORTANT: Do not use this output control unless the actual alcohol content in the fuel tank is 10 percent or less. False DTCs may set as a result.
RENDER: 1.0x

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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