K 1500 Yukon Denali AWD V8-6.0L VIN U (2002)
Engine Control Module: Service and Repair
Service Programming System (SPS)
The Service Programming System (SPS) allows a technician to program a control module through the Data Link Connector (DLC). The information
transfer circuit that is used at the DLC is the same serial data circuit used by the scan tool for retrieving Diagnostic Trouble Codes (DTCs), displaying
data, clearing DTCs, etc. This procedure offers the ability to install software/calibrations matched to a particular vehicle.
Most control modules have 2 types of memory. The software/calibrations reside in the flash memory. The two types of memory are listed below:
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Electrically Erasable Programmable Read Only Memory (EEPROM)
This type of memory allows selected portions of memory to be programmed while other portions remain unchanged.
Certain learned values reside in the EEPROM, such as:
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The Vehicle Identification Number (VIN)
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The crankshaft variation learned position
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The software/calibrations identification numbers
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The control module security information
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Flash Read Only Memory - Flash Memory
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Flash memory has increased memory storage capacity. During programming, all information within this type of memory is erased, and then
replaced with entirely new information.
Service Programming Methods
The 4 methods of programming a control module and the proper tools for each method are as follows:
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Remote Programming:
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The Tech 2 or other scan tool, Techline Terminal or a personal computer equipped with General Motors Corporation authorized programming
software-The Tech 2 or other scan tool is used as an interface between the vehicle and the Techline Terminal or a personal computer.
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The control module is installed in the vehicle
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Pass Thru Programming:
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The Tech 2 or other scan tool, Techline Terminal or a personal computer equipped with General Motors Corporation authorized programming
software-The Tech 2 or other scan tool is used as an interface between the vehicle and the Techline Terminal or a personal computer.
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The control module is installed in the vehicle.
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Off-Board Remote Programming, vehicle NOT available:
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The Tech 2 or other scan tool, Off-board Programming Adapter (OBPA), Techline Terminal or a personal computer equipped with General
Motors Corporation authorized programming software-The Tech 2 or other scan tool is used as an interface between the vehicle and the
Techline Terminal or a personal computer.
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The control module is NOT installed in a vehicle
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Off-Board Pass Thru Programming
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The Tech 2 or other scan tool, off-board programming adapter (OBPA), Techline Terminal or a personal computer equipped with General
Motors Corporation authorized programming software-The Tech 2 or other scan tool is used as an interface between the vehicle and the
Techline Terminal or a personal computer.
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The control module is NOT installed in a vehicle
Before Programming A Control Module
IMPORTANT: DO NOT program an existing control module with the identical software/calibration package. This procedure is not a short cut to
correct a driveability condition. This is an ineffective repair. A control module should only be programmed when the following occurs:
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When a service procedure instructs you to replace the control module. The service part control module does not contain operating software or
calibrations.
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General Motors Corporation releases an updated software/calibration package.
Ensure that the following conditions are met before programming a control module:
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Vehicle system voltage:
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There are no charging system concerns. All charging system concerns must be repaired before programming a control module.
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The battery voltage is greater than 12 volts but less than 16 volts. The battery must be fully charged before programming the control module.
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A battery charger is NOT connected to the vehicles battery. Incorrect system voltage or voltage fluctuations from a battery charger may cause
programming failure or control module damage.
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Turn OFF or disable any system that may put a load on the vehicles battery. Turn OFF or disable systems such as:
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Daytime Running Lights (DRL). Applying the parking brake, on most vehicles, disables the DRL system.
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Heating, Ventilation, And Air Conditioning (HVAC) systems
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Engine cooling fans, etc
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The ignition switch is in the proper position. The scan tool prompts you to turn ON the ignition, with the engine OFF. DO NOT change the
position of the ignition switch during the programming procedure unless instructed to do so.
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All tool connections are secure:
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The RS-232 cable
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The connection at the DLC
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The voltage supply circuits
