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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET1998METRO L4-079 1.3L VIN 2 MFIREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONPOWERTRAIN CONTROL MODULE FUNCTIONPCM OUTPUTS DESCRIPTIONMAIN RELAY
1998 Chevrolet Metro L4-079 1.3L VIN 2 MFI
Main Relay
1998 Chevrolet Metro L4-079 1.3L VIN 2 MFISECTION Main Relay
Main Relay:
The main relay is controlled by the powertrain control module (PCM). The PCM provides an electrical ground for the coil of the main relay when the ignition is ON or when the engine is running. The main relay provides power to many of the engine control components including the PCM. The following is a list of some of the PCM controlled outputs that depend on the main relay for proper operation:
^ The ignition system
^ The fuel injectors
^ The fuel pump
^ The [1][2]EVAP control system solenoids
^ The Idle Air Control (IAC) valve
The main relay is located in the relay box on the LH side of the engine compartment near the battery.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.