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.
- Turn ignition on, with engine off. Using scan tool, monitor EGR sensor. If scan tool reads greater than 4.82 volts, go to next step. If scan tool does not read greater than 4.82 volts, problem is intermittent. See DIAGNOSTIC AIDS .
- Disconnect EGR solenoid harness connector. Observe scan tool voltage reading. If voltage reading is less than 0.14 volt, go to next step. If voltage reading is not less than 0.14 volt, go to step 5.
- Using a DVOM, check voltage between EGR solenoid harness connector terminals "B" (Purple/White wire) and "D" (Gray wire). If 4-6 volts are present, replace EGR solenoid. If 4-6 volts are not present, check for open in Purple/White wire to ECM. Repair as necessary. If circuit is okay, check for terminal tightness at connectors. Repair as necessary. If terminals are okay, replace ECM.
- Using a DVOM, check voltage on EGR solenoid harness connector terminal "C" (Brown wire). If 4-6 volts are present, check for short to voltage in Brown wire. Repair as necessary. If circuit is okay, replace ECM. If 4-6 volts are not present, repair short between Brown and Gray wires from EGR solenoid and ECM harness connectors.
Factory Service Tools
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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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