GM 88999112 Engine Control Module Assembly(Remanufacture)

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The multicube or the electronic control module according to the make and model of the car is located on the front passenger side at the back of the instrument panel. Depending on the specific car models that the ECM is designed for, the calibrated or built-in PROM contains specific information about the car's weight, make and model of the engine, transmission type and axle ration. Original equipment numbers should be confirmed in order to prevent the installation of a non-related PROM because units referred to as controllers, replacements for the ECM, do not include a PROM. It will be important that the PROM from the old ECM that is being married to the new unit is delicately removed and then put in place. Also, on the same access cover as the PROM but in the form of a calpak which can deliver fuel if there are issues with other ECM parts. In the case of a faulty ECM, the PROM should be checked for correctness as trouble code 51 mean incorrect installation. If the ECM is being replaced, it is mandatory to manually enter the broadcast code and the production ECM number on a new part label put on the new ECM, but nothing to be recorded on the cover of the ECM. Before the ECM can be removed, the battery must be disconnected, the wiring harness and mounting brackets and screws must be disconnected as well as removed before pulling the ECM out of the passengers compartment. The PROM and calpak are located under the access cover that is located on the top of the control unit. Rocker type PROM removal tool should be inserted by engaging one end of the PROM carrier with the tool and pressing on the vertical bar and then rocked upwards by the engaged end of the PROM carrier. Same operations are to be performed at the other end till the PROM carrier and PROM are out of the socket and a removal tool is used to avoid damage on the PROM or socket.

The ECM being the third is situated behind the padded console which is installed in between the seat and the backrest. Start by removing the negative battery terminal and to avoid any shorting of the ECM connectors the ignition should be turned off. Take off the padded centre console; release the electrical connectors and fasten the ECM nuts; there are big connectors at the bottom of the module which has to be unplugged before the module is unbolted from the four mounting bolts. Very gently remove the ECM and then transfer 7ROM from the old one to the new ECM. When replacing the existing PROM with a new one, in the old ECM, use a rocker type PROM remover in order to avoid damaging the PROM or socket while removing the access cover. Please ensure that the new PROM's number matches the old one without having to take it out from the carrier. Place the new PROM carrier in the ECM socket in proper alignment to the pinheads of the PROM and press it down without touching the PROM. The access cover must be replaced and locked unto the screws while the ECM is mounted on its support bracket and the electrical connectors reconnected. When the padded console has been reinstalled, start the car and go to the diagnostics testing mode; readings must show that Code 12 has been repeated several times with no other code meaning that the PROM has been installed correctly. If an illustration, trouble code 51 appears or the Service Engine Soon light is still on, make sure that the PROM is installed properly, or it on the wrong side, or the pins are bent, or else it is bad. This problem may be solved by the firm pressing on the carrier, though it must be fully seated. Do not perform this maneuver because installing the PROM backwards will fry the circuitry in the microcontroller. If any of the pins are bent the user should straighten them but in case they are broken then the PROM should be replaced with a new one.