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Wiring harness installation
tips
Colors (in general):
black
is ground
pink is
keyswitched power
orange
is full time power
EXCEPION: The dataline to the diagnostics module is also orange.
EXCEPION: Tan is
sometimes ground.
In these pages,
B+, "battery power", and "full time power" mean the same thing
"keyswitched power," and "hot in run" mean the same thing.
Wiring diagrams are invaluable. Click to enlarge.
Color diagram of the
ECU inputs and outputs |
Diagram of the EFI system |
Connecting powers and grounds
Leads to be connected to the fuse box
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click to enlarge.
Use a test light to find key-switched
and full time power at the fuse box.
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Connecting the ignition
signal module and the vehicle speed sensor module (VSS module)
Click to enlarge.
Each module needs power(red) and ground(black). VSS module uses yellow
as input and orange as out. Ignition module uses green as input, brown
as output. Note: don't crimp the pink power lead yet, add a lead to the
fuel pump relay here.
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Conneting the fuel pump
relay
Click to enlarge.
The relay runs the pump for start up, then the oil pressure switch
takes over. The tan lead to the ECU senses the power to the fuel pump.
Run a lead with an inline 15 amp fuse to battery power.
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Click to enlarge.
An alternate method is to run the pump by keyswitched power, and use a
safety shut off switch in line.
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Click to enlarge.
Fuel pump relay wiring.
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Connecting the starter
signal wire
Single purple wire goes to the starter solenoid.
Also shown: power for the fuel pump relay.
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Connecting the sensors and
the ECU
 
Two multipin connectors plug into the ECU.
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Connect temperature sensor to the two terminal plug with yellow and
black wires.
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Click to enlarge.
Connect the injectors to either injector plug, connect the Idle Air
Controller (IAC) to it's 4 terminal connector,
Connect the Throttle Position Sensor (TPS)to the black 3 terminal
connector, and the Manifold Absolute Pressure Sensor (MAP) to the green
connector.
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The oxygen sensor has only one wire, and a one terminal connector.
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The oil pressure switch can be connected either way. Orange is power,
tan goes to the pump.
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Connecting the diagnostic module
Click to enlarge.
The diagnostic module has wires with colors matching the harness,
except without stripe on the brown and the white wires.
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Installing the eprom
Remove Eprom from ECU
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Pry apart carrier so eprom legs are released. Eprom will come out one
side some,
then the other, then push it out from the back Sometimes the tip of a
knife can be helpful to
free the legs
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Put new eprom in carrier. Note notch positions. Legs should be back
against the
carrier when installed properly. Re-install in ECU.
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