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 MANUALSSATURN2002SL1 L4-1.9L SOHC VIN 8REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSMANIFOLD PRESSURE/VACUUM SENSORDESCRIPTION AND OPERATION
2002 Saturn SL1 L4-1.9L SOHC VIN 8
Manifold Pressure/Vacuum Sensor: Description and Operation
2002 Saturn SL1 L4-1.9L SOHC VIN 8SECTION Description and Operation
The MAP sensor is located in the intake manifold on both SOHC and DOHC 1.9 L engines. The MAP sensor is a transducer that varies resistance according to changes in intake manifold pressure (vacuum). The PCM measures the signal voltage from the MAP sensor, which is a reduced value of the PCM 5 volt reference. The voltage ranges from 1 - 1.5 volts at idle (low pressure/high vacuum) to 4 - 4.5 volts at wide open throttle (high pressure/low vacuum).
The MAP sensor is primarily used for fuel control. Low intake manifold pressure indicates low engine RPM or low engine load. The higher the pressure in the intake manifold, the greater the load on the engine. The MAP sensor is also used for ignition timing, EVAP purge solenoid duty cycle, EGR operation and EGR flow diagnostics.
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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.