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.
2000 Saturn LS2 AutomaticFACTORY OEM SERVICE PROCEDURE
Diagnostic Procedures
- Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
- Attempt to start engine. If engine starts, problem is intermittent. See DIAGNOSTIC AIDS . If engine does not start, go to next step.
- Check ENG CNTRL 3 fuse. Replace as necessary. Remove fuel pump relay located in left passenger compartment fuse/relay block. Connect a test light between relay cavities No. 85 (Orange wire) and No. 86 (Light Green wire) in fuse/relay block. Using scan tool, command fuel pump on. If test light does not illuminate, go to next step. If test light illuminates, check for terminal tightness at fuse/relay block. Repair as necessary. If terminals are okay, replace fuel pump relay.
- Turn ignition on, with engine off. Connect test light between ground and relay cavity No. 85 (Orange wire) in fuse/relay block. If test light does not illuminate, repair open in circuit (Orange wire). If test light illuminates, check for open in circuit (Orange wire). Repair as necessary. If circuit is okay, check for terminal tightness at fuse/relay block. Repair as necessary. If terminals are okay, replace ECM.
Factory Service Tools
Use the Manual With the Right Hardware
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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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