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.
2007 Chevrolet Express 1500 RWD V6-4.3LFACTORY OEM SERVICE PROCEDURE
Engine Control Module: Testing and Inspection
Powertrain Control Module Programming and Setup
The following service procedures require either a programming or a setup event be performed for a complete repair.
PCM Replacement
If the powertrain control module (PCM) is replaced, the following procedures must be performed:
1. The PCM Reprogramming-Refer to Service Programming System (SPS). Programming and Relearning
2. The CKP Variation Learn
* Refer to Crankshaft Position System Variation Learn in Computers and Control Systems - 4.3L (LU3).
* Refer to Crankshaft Position System Variation Learn in Computers and Control Systems - 4.8L, 5.3L, 6.0L (LR4, LM7, LQ4, LQ9, or L59).
3. The Immobilizer programming-Refer to Programming Immobilizer System Components. Programming and Relearning
PCM Reprogramming
* If the PCM needs to be reprogrammed, refer to Service Programming System (SPS). Programming and Relearning
* Engine Oil Life Remaining-When available, use a scan tool to reset the Engine Oil Life Remaining back to the original percentage recorded before the module was reprogrammed.
* Transmission Fluid Life Remaining-When available, use a scan tool to reset the Transmission Fluid Life Remaining back to the original percentage recorded before the module was reprogrammed.
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.
* Engine replacement
* Any engine repair that disturbs the crankshaft position (CKP) sensor or it's relationship with the crankshaft reluctor wheel
* CKP sensor
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:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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