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.
Chart 2
2000 Saturn LW1 L4-2.2L VIN FSECTION Chart 2
Diagnostic Chart (Part 2 Of 3):
Schematic (Part 2 Of 3):
Since the BCM is the master on the Class II link and the SDM is on every vehicle, these controllers should be communicated with first since they may help to determine potential serial data link errors.
This chart continues establishing communications with each of the applicable modules on the vehicle.
The 4 cylinder (L61) the engine and transaxle are controlled by a powertrain control module which communicates on the Class II link. The V6 (L81) engine and automatic transaxle communicates with the Scan tool over a KW2000 data link. Also, the electronic brake/traction control module (EBTCM) communicates over a KW2000 data link, but on a separate wire.
If communications can be established with each control module, and there are no DTCs associated with any module, the on-board diagnostics system check is complete. If no DTCs are detected, the next step is refering to the symptom section related to the customer complaint.
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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.