Cutlass Ciera Cruiser V6-231 3.8L (1985)
2.
Remove Instrument Panel right sound insulator. On Cutlass Ciera and Cutlass Cruiser, also remove the Instrument Panel Compartment.
3.
Loosen nut(s) for Electronic Control Module (ECM) to mounting bracket.
4.
Disconnect electrical connectors and remove ECM. See Section 8C of the 1985 Oldsmobile Firenza, Calais, Cutlass Ciera, Ninety-Eight Chassis
Service Manual, Volume 11, for illustration and removal Instructions.
5.
Remove PROM access cover. See Section 6E3, pages 174, 175, and 176, of above noted service manual for detailed instructions regarding PROM
removal and installation.
Figure 1.
6.
Remove PROM assembly using the rocker-type PROM removal tool (See Figure 1).
NOTICE:
Using the rocker-type PROM removal tool, engage one end of the PROM carrier with the hook end of the tool. Press on
the vertical bar end of the tool and rock the engaged end of the PROM carrier up as far as possible. Engage the opposite
end of the PROM carrier in the same manner and rock this end up as far as possible. Repeat this process until the PROM
carrier and PROM are free of the PROM socket. The PROM carrier with PROM in it should lift off of the PROM socket
easily. PROM carrier should only be removed by using the pictured PROM removal tool. Other methods could cause
damage to the PROM or PROM socket.
7.
Install new PROM assembly in ECM. On the NINETY-EIGHT, install new PROM based on the old PROM Code or old PROM I.D. per the
PARTS INFORMATION section.
NOTICE:
Small notch of PROM carrier should be aligned with small notch in ECM socket. Press on PROM carrier until it is firmly
seated in the socket. Do not press on PROM, only on the carrier. See Figure 2.
Figure 2.
8.
Reverse stops 5 to 2 to reinstall ECM.
9.
Reconnect the negative battery cable, and reset memory functions, including owner's radio station preferences.
10.
Start the engine and observe check engine light. If it does not go out, the PROM was installed backwards and is now damaged; a new PROM will
have to be installed in the correct orientation.
