Using the ALDL Port, the OBD1 Fault Codes are retrieved and analyzed when necessary for diagnosis.
Your ECM is tested in an actual ZR1 when necessary for diagnosis.
Using our ZR1 Emulator, a specific and accurate diagnosis is possible.
Often one or several power transistors fail and require replacement.
Components U13 and U15 are application specific Delco proprietary ICs that tend to fail after three decades.
To restore an ECM, it's sometimes necessary to rework the circuit boards with an outboard micro-controller, equipped with customized firmware, to substitute for a failed component.