Savana 4500 V8-6.6L DSL Turbo (2009)
Fuel Injector: Procedures
Fuel Injector Flow Rate Programming
Circuit/System Description
The control functions for the fuel injection system are integrated in the engine control module (ECM). Each injector's flow rate information and cylinder
position are stored in the memory of both the glow plug control module (GPCM) and the ECM. The fuel injector flow rate programming must be done
when any of the following procedures are performed:
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The ECM is replaced
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The GPCM is replaced
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Any fuel injectors are replaced
If the ECM does not communicate, the flow rate information can be retrieved from the GPCM. If both control modules fail to communicate, the fuel
injector flow rate information, or injection quantity adjustment (IQA) flow rate numbers, will need to be retrieved from each individual injector.
Before Programming A Control Module
Important: DO NOT program a control module unless you are directed by a service procedure or you are directed by a General Motors
Corporation service bulletin. Programming a control module at any other time will not permanently correct a customers concern.
Ensure the following conditions are met before programming a control module:
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Vehicle system voltage
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There is no charging system concern. All charging system concerns must be repaired before programming a control module.
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Battery voltage is between 12-16 volts. The battery must be charged before programming the control module if the battery voltage is low.
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A battery charger is NOT connected to the vehicle 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 of the following systems that may put a load on the vehicle battery:
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Twilight sentinel
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Interior lights
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Daytime running lights (DRL)-Applying the parking brake, on most vehicles, disables the DRL system.
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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.
*
All of the following tool connections are secure:
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The connection at the data link connector (DLC)
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The voltage supply circuits
*
DO NOT disturb the tool harnesses while programming. If an interruption occurs during the programming procedure, programming failure or
control module damage may occur.
Circuit/System Verification
Review the Display ECM & GPCM Inj. Flow Rates parameter with a scan tool. All cylinders should be programmed with a flow rate number. Both the
GPCM and the ECM should be programmed with the same flow rate numbers for the corresponding cylinders.
Circuit/System Testing
Important: If the flow rate number is not available in either control module, the numbers will need to be retrieved from each individual
injector.
Fuel Injector Identification Numbers
