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 FUNCTIONPCM OUTPUTS DESCRIPTIONOUTPUT COMPONENTS
1998 Chevrolet Metro L4-079 1.3L VIN 2 MFI
Output Components
1998 Chevrolet Metro L4-079 1.3L VIN 2 MFISECTION Output Components
Output Components
The powertrain control module (PCM) is responsible for the control and operation of many output components. The PCM controls many components with an electronic switch that completes a ground circuit when turned ON. The PCM monitors the output components for the proper response to the PCM commands. Components where functional monitoring is not feasible will be monitored for circuit continuity and out-of-range values if applicable.
Output components to be monitored include, but are not limited to the following circuits:
^ The Idle Air Control (IAC) valve
^ The Main Relay
^ The Malfunction Indicator Lamp (MIL) control
^ The Up-Shift Indicator Lamp
^ The electronic transaxle controls
^ The A/C Compressor Control Module (A/C relay)
^ The cooling fan relay
For more information on some of the PCM output components refer to PCM Outputs Description.
The powertrain control module (PCM) is responsible for the control and operation of many output components. The PCM controls many components with an electronic switch that completes a ground circuit when turned ON. The PCM monitors the output components for the proper response to the PCM commands. Components where functional monitoring is not feasible will be monitored for circuit continuity and out-of-range values if applicable.
Output components to be monitored include, but are not limited to the following circuits:
^ The Idle Air Control (IAC) valve
^ The Main Relay
^ The Malfunction Indicator Lamp (MIL) control
^ The Up-Shift Indicator Lamp
^ The electronic transaxle controls
^ The A/C Compressor Control Module (A/C relay)
^ The cooling fan relay
For more information on some of the PCM output components refer to PCM Outputs 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.