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SuperDave
SuperDave, ASE Certified Technician
Category: Chevy
Satisfied Customers: 1491
Experience:  over 16 years experience
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Chevrolet Silverado 1500: How to remove and replace the ecu

Customer Question

How to remove and replace the ecu unit on my 1994 chevrolet pickup. My Haynes manual showes it to be installed vertical but it's installed horizontal. My probable is there is no room to remove it.
Submitted: 2 years ago.
Category: Chevy
Expert:  SuperDave replied 2 years ago.
Inside passenger compartment, under RH end of I/P behind glove box. View Full Image CAUTION: The ignition must be "OFF," when disconnecting or reconnecting the control module connector, to prevent internal damage to the control module.To prevent possible Electrostatic Discharge to the control module, DO NOT touch the connector pins or soldered components on the circuit boards.REMOVAL:Disconnect the negative battery terminal.Remove glove box panel.Remove mounting brackets and/or retainers.Remove control module from tray.Disconnect control module harness connectors.Remove access cover and PROM.INSTALLATION:Install PROM and access cover on to new control module.Install mounting brackets and module(s).Install control module into tray until clips lock.Install control module harness connectors.Install glove box panel.Connect the negative battery terminal.Perform functional check.
Expert:  SuperDave replied 2 years ago.
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Thank you!David