Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2009 Hummer H3 L5-3.7LFACTORY OEM SERVICE PROCEDURE
Engine Control Module Programming and Setup
Engine Control Module Programming and Setup (LLR) (3.7L)
The following service procedures require either a programming or a setup event be performed for a complete repair.
ECM Replacement
Warning
Replacement or reprogramming of the ECM, or replacement of the clutch pedal position sensor (CPPS) or clutch pedal requires that a CPPS learn procedure be performed. Failure to perform the CPPS learn procedure may result in personal injury or damage to the vehicle or its components if the vehicle is in gear and the starter motor is accidentally engaged.
If the engine control module (ECM) is replaced, the following procedures must be performed:
1. ECM Reprogramming-Refer to Service Programming System (SPS) (Programming and Relearning).
2. Clutch pedal position sensor learn-Refer to Clutch Pedal Position Sensor Learn (Clutch Pedal Position Sensor Learn).
3. Crankshaft Position (CKP) Variation Learn-Refer to Crankshaft Position System Variation Learn (Procedures) for 3.7L engine.
4. The Throttle/Idle Learn procedure-Refer to Throttle/Idle Learn (Procedures).
ECM Reprogramming
If the ECM needs to be reprogrammed, refer to Service Programming System (SPS) (Programming and Relearning).
Setup for Component Replacement
The replacement of some components will require a setup procedure for complete repair.
If any of the following components are replaced, a CKP Variation Learn Procedure must be performed. Refer to Crankshaft Position System Variation Learn (Procedures) for 3.7L engine.
* Engine replacement
* Any engine repair that disturbs the CKP sensor or it's relationship with the crankshaft reluctor wheel
* CKP sensor
• If the throttle body is replaced or a throttle body cleaning procedure is completed, the Throttle/Idle Learn Procedure must be performed. Refer to Throttle/Idle Learn (Procedures).
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
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