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.
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HOMESERVICE MANUALSSATURN2000SL2 AUTOMATIC, MP6REPAIR AND DIAGNOSIS (SINGLE PAGE)STEERINGELECTRONIC STEERINGVARIABLE EFFORT STEERINGDIAGNOSTIC TESTSDTC P0637: HIGH CIRCUITDIAGNOSTIC AIDS
2000 Saturn SL2 Automatic, MP6
Diagnostic Aids
2000 Saturn SL2 Automatic, MP6SECTION Diagnostic Aids
Scan tool displays Electronic Variable Orifice (EVO) output and feedback values to assist in diagnosis of EVO system. When system is operating as it should, the following conditions will occur:
- When no output is generated by PCM (EVO actuator not cycling), output value indicated on Tech 1 scan tool will be 100 percent, and feedback value will be zero percent.
- When output is generated by PCM (EVO actuator cycling), output value will decrease, and input value will increase proportionally. For example, if output is 80 percent, input will be 20 percent, or if output is 20 percent, input will be 80 percent.
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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.