Wiring

Wiring Conversion

On this page I will try to guide you through the wiring setup for installing the computer for the Caddy fuel system and how to inter face it into the Fiero master harness. First you will need the pin out for the Caddy computer so that you will know what wire is for what purpose. To determine each wires location this will de accomplished usinga multi meter or continuity tester,and using the pin out for the computer by testing pin to wire end on the harness.It is quite easy to do since there are only 7or8 wires you will have to inter face into the car, depending on application ie (air cruise). If you do not have these accessories you are one step closer to finishing the conversion.

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Engine Control System-1988 & 1989

Cadillac, Deville/Fleetwood

24 pin connector

A1. O2 Sensor Ground B1. Power

A2. Blank B2 . O2 Sensor

A3. Timer Module Input B3. Crank Input

A4. Park Neutral Input B4. Cruise Set/Coast Input

A5. 3rd Gear Switch (trans) B5. Brake Input

A6. Ignition Power B6. Cruise Resume/Accle Input

A7. Distributor Ref. Hi B7. 4th Gear Switch (trans)

A8. Distributor Ref. Lo B8. Temp. Sensor

A9. Coolant Temp./Fan Warning Light. B9. Blank

A10.Canister Purge B9. Blank

A11.Converter Clutch Solenoid B11. ALDL Request

A12. ALDL Ground B12.Trans. Temp. Sensor

Engine Control System-1988 & 1989 Cadillac

Deville/Fleetwood Page(2 of 2)

32 Pin Connector

C1. Service Engine Soon Light D1. Ground (IAC)

C2. EGR Solenoid Control (black plug) D2. Blank

C3 . Service Engine Now (ALDL) D3. Air Switch Solenoid Control (green plug)

C4 . Air diverter Solenoid (white plug) D4. Cruise Engaged IND Control

C5. Blank D5. ETS By-Pass Output (dist.)

C6. A/C Relay Control D6. Map Sensor Input

C7. Spark Timing Output (dist.) D7. TPS Input

C8. Vehicle Speed Input D8. Power Steering Pressure Switch

C9. ECM Data D9. Fuel Pump Feedback

C10.Throttle Switch Input (IAC) D10. Cruise Vacuum Control Valve

C11.BCM-ECM Data D11. Cruise Vent Control Valve

C12.Cruise Enable Input D12. Sensor Ground

C13. 5V Ref. D13. Sensor Ground

C14. Idle Speed Control Lo (IAC) D14. Fuel Pump Relay Control

C15.Idle Speed Control High (IAC) D15. Injector B Control

C16.Power D16. Injector A Control

Computer Number 01228322

Using the pin out text and a volt meter or a continuity tester locate the wires you need in the harness ie (cruise

control,ac) so that they can be connected to the master harness of the Fiero via the connector located in the computer bay between the seats as well as the seven other wires that have to be connected which are :speed

input,ground,power in,key power in,brake input,service engine soon,park neutral input,fuel pump relay control.

inexpensive multi meter or continuity tester is needed to do the

wiring setup such as these here.

This is the computer you will be using in this swap

To do the pin out you will need to recognize these connectors .If you look at the end of the connectors you will see the pin location numbers so you can do the pin out easily.

as you can see the black line I have marked on each of the plugs represents pin one on each side of the plugs use these points as a reference point to start the pin out process

using the continuity tester locate each wire point on the sub connector and its corresponding location on the computer plug and what it is used for then mark and tag it for later reference using the pin out above you can reference each wire and what it is for. Then separate them form the sub connector .