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 SYSTEMSENGINE CONTROL MODULESERVICE AND REPAIR
1998 Chevrolet Metro L4-079 1.3L VIN 2 MFI
Engine Control Module: Service and Repair
1998 Chevrolet Metro L4-079 1.3L VIN 2 MFISECTION Service and Repair
Removal Procedure
Notice: Check the resistance values of all PCM relays, solenoids, and other output controls before replacing or substituting the Powertrain Control Module (PCM). Check all the sensor wiring and the PCM output control circuits for a short to ground before replacing or substituting the PCM. Perform all circuit repairs or malfunctioning component part replacements before installing a replacement or substitute PCM. This will prevent damage to the replacement or substitute PCM.
Notice: In order to prevent possible Electrostatic Discharge damage to the PCM, Do Not touch the connector pins or the soldered components on the circuit board.
Important: Service of the powertrain control module (PCM) consists of the replacement of the PCM. The PCM has no serviceable parts. The PCM does not have a programmable read only memory (PROM) chip to replace inside the PCM. The PCM does not have an erasable programmable read only memory (EPROM) chip to recalibrate. Replace the PCM as a complete assembly if the PCM is determined to be faulty.
Important: When replacing the production powertrain control module (PCM) with a service PCM, transfer the broadcast code and production PCM number to the service PCM label. This will allow for positive identification of the PCM throughout the service life of the vehicle.
Caution: Refer to Battery Disconnect Caution in Cautions and Notices.
1. Disconnect the negative battery cable.
2. Open the glove box.
3. Apply pressure to the sides of the glove box in order to release the two side catches and pull the glove box down.
4. Remove the three bolts and PCM bracket from behind glove box.
5. Disconnect the three PCM electrical connectors.
6. Remove the PCM from the passenger compartment.
Installation Procedure
1. Connect the three PCM electrical connectors.
2. Install the PCM bracket to mounting position behind the glove box.
3. Secure the PCM bracket with the three bolts.
Tighten
Tighten the PCM bracket bolts to 6 N.m (4 lb ft).
Notice: Refer to Fastener Notice in Cautions and Notices.
4. Push the glove box up in order to reset the two side catches.
5. Connect the negative battery cable.
Tighten
Tighten the negative battery cable terminal retainer to 5.5 N.m (49 lb in).
Notice: Check the resistance values of all PCM relays, solenoids, and other output controls before replacing or substituting the Powertrain Control Module (PCM). Check all the sensor wiring and the PCM output control circuits for a short to ground before replacing or substituting the PCM. Perform all circuit repairs or malfunctioning component part replacements before installing a replacement or substitute PCM. This will prevent damage to the replacement or substitute PCM.
Notice: In order to prevent possible Electrostatic Discharge damage to the PCM, Do Not touch the connector pins or the soldered components on the circuit board.
Important: Service of the powertrain control module (PCM) consists of the replacement of the PCM. The PCM has no serviceable parts. The PCM does not have a programmable read only memory (PROM) chip to replace inside the PCM. The PCM does not have an erasable programmable read only memory (EPROM) chip to recalibrate. Replace the PCM as a complete assembly if the PCM is determined to be faulty.
Important: When replacing the production powertrain control module (PCM) with a service PCM, transfer the broadcast code and production PCM number to the service PCM label. This will allow for positive identification of the PCM throughout the service life of the vehicle.
Caution: Refer to Battery Disconnect Caution in Cautions and Notices.
1. Disconnect the negative battery cable.
2. Open the glove box.
3. Apply pressure to the sides of the glove box in order to release the two side catches and pull the glove box down.
4. Remove the three bolts and PCM bracket from behind glove box.
5. Disconnect the three PCM electrical connectors.
6. Remove the PCM from the passenger compartment.
Installation Procedure
1. Connect the three PCM electrical connectors.
2. Install the PCM bracket to mounting position behind the glove box.
3. Secure the PCM bracket with the three bolts.
Tighten
Tighten the PCM bracket bolts to 6 N.m (4 lb ft).
Notice: Refer to Fastener Notice in Cautions and Notices.
4. Push the glove box up in order to reset the two side catches.
5. Connect the negative battery cable.
Tighten
Tighten the negative battery cable terminal retainer to 5.5 N.m (49 lb in).
RENDER: 1.0x
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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.