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 MANUALSCHEVROLET1998METRO L4-079 1.3L VIN 2 MFIREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONPOWERTRAIN CONTROL MODULE FUNCTIONINPUT COMPONENTS
1998 Chevrolet Metro L4-079 1.3L VIN 2 MFI
Input Components
1998 Chevrolet Metro L4-079 1.3L VIN 2 MFISECTION Input Components
Input Components
The powertrain control module (PCM) supplies a buffered voltage to the various information sensors and switches. The PCM monitors the input components for circuit continuity and out-of-range values. The PCM also provides performance checking. Performance checking refers to the PCM indicating a fault when the signal from an input does not seem reasonable (i.e. a throttle position (TP) sensor that indicates high throttle position at low engine loads or low manifold absolute pressure sensor voltage). The input components may include, but are not limited to the following sensors and switches:
^ Vehicle Speed Sensor (VSS)
^ Crankshaft Position (CKP) sensor
^ Throttle Position (TP) sensor
^ Engine Coolant Temperature (ECT) sensor
^ Camshaft Position (CMP) sensor
^ Manifold Absolute Pressure (MAP) sensor
^ Heated Oxygen Sensors (HO2S)
^ Fuel tank pressure sensor
^ Fuel Level sensor
^ Diode Module (engine electrical loads)
^ Power Steering Pressure (PSP) switch (if equipped)
^ Transmission range switch (A/T only)
^ The A/C Compressor Control Module (A/C relay)
^ Clutch Pedal Position (CPP) switch (M/T only)
For more information on some of the PCM input components refer to Information Sensors/Switches Description.
The powertrain control module (PCM) supplies a buffered voltage to the various information sensors and switches. The PCM monitors the input components for circuit continuity and out-of-range values. The PCM also provides performance checking. Performance checking refers to the PCM indicating a fault when the signal from an input does not seem reasonable (i.e. a throttle position (TP) sensor that indicates high throttle position at low engine loads or low manifold absolute pressure sensor voltage). The input components may include, but are not limited to the following sensors and switches:
^ Vehicle Speed Sensor (VSS)
^ Crankshaft Position (CKP) sensor
^ Throttle Position (TP) sensor
^ Engine Coolant Temperature (ECT) sensor
^ Camshaft Position (CMP) sensor
^ Manifold Absolute Pressure (MAP) sensor
^ Heated Oxygen Sensors (HO2S)
^ Fuel tank pressure sensor
^ Fuel Level sensor
^ Diode Module (engine electrical loads)
^ Power Steering Pressure (PSP) switch (if equipped)
^ Transmission range switch (A/T only)
^ The A/C Compressor Control Module (A/C relay)
^ Clutch Pedal Position (CPP) switch (M/T only)
For more information on some of the PCM input components refer to Information Sensors/Switches Description.
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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.