Recommended Connection:

The PSC1-009 is used to condition the MAF sensor output to look like an air flow meter signal. The values in the map table A are used to offset the MAF signal output. The map values are used to both match the curve of the AFM signal and tune the engine for performance modifications.

A cell value of 10 leaves the signal unchanged. A cell value of 20 adds 2.5V to the signal. A cell value of 0 subtracts 2.5V from the signal. One significant digit is allowed to the right of the decimal point. Values such as 12.3 are permissible. There are a total of 200 cell values creating a resolution of 25mV.

Wire Assignments:

LABEL	CONNECT TO	WIRE COLOR
B+	Switched battery positive	Red
B-	Signal ground at ECU	Black
MAF IN	MAF sensor output	Green
SIGNAL OUT	ECU AFM input	Violet
TACH	Tach signal (pulses per rev = #cyl/2)	Yellow/Black
TEMP	ECU intake air temp input	Gray
Fuel Pump	Fuel pump relay coil - negative side	Orange
8V Reference	AFM reference input on ECU	Blue
F-DB9	Serial connector on computer	---

Wiring Hints:

1. Connect the Black wire to the ECU sensor ground.
2. Connect the Red wire to a source of power that is switched by the ignition and maintains a solid battery voltage during cranking.
3. Be sure to connect the sensor ground of the MAF sensor to the ECU sensor ground.
4. Connect the Orange fuel pump relay driver to the negative side of the fuel pump relay. The other side of the relay coil should be tied to switched +12V.
5. The Gray wire can be used to provide the intake air temp signal. It will tell the ECU that it is a constant 70 degrees F. For better cold start performance, a separate air temp sensor may be used.

Software:

The PSC1 is programmed with the R4 Fuel Controller Software. Refer to the R4 data sheet for more information on programming. When the software is launched, an identification screen will appear that says Split Second. After four seconds, the maim menu will appear. If this is a new application, select File then New Customer to create a new customer. Type in the customer name and save. The default location for customer names is My Documents. When you return to the main screen, select File and Open Customer to open the customer file that you just created. Once the customer is open, the Maps, View, Options and Help tabs become active. Whenever you write new data to the PSC1, all settings and mapping will automatically be saved under the current customer name. You can fill in the various fields such as name, address etc. if you like. 

Connections:

Select the proper com port for the serial connector on your computer. Remove the lid on the PSC1. Connect the PSC1 to the computer using a 9-pin serial cable. The cable must have a male plug on one end and a female on the other. Once the serial cable is plugged in and the PSC1 is powered up, you may connect to the PSC1 by selecting the Connect to ECU icon. Once communication has been established with the ECU, the Real Time pull down becomes active.  

Programming:

Use the Options pull down and Systems Settings option to select Voltage mode and Programmable Signal Conditioner. Use the Options pull down and Engine Settings to select the number of cylinders of the engine.. Use the Maps pull down to access the fuel map tables. There are two map tables in the R4 program. The PSC1 uses table A. The active cell at any given time is determined by the MAF sensor reading and RPM.

The number entered into the cells on the map represent the amount that the input voltage is offset (signal modify mode). The number entered in the cell can range from 0.0 to 20.0. The step size is 25mV. Example outputs are shown on the following table. Note that there are 200 cell values. Only 20 are shown for simplicity.

Cell Value	Voltage Offset
0	-2.5
1	-2.25
2	-2.0
3	-1.75
4	-1.5
5	-1.25
6	-1.0
7	-0.75
8	-0.5
9	-0.25
10	0.0
11	0.25
12	0.5
13	0.75
14	1.0
15	1.25
16	1.50
17	1.75
18	2.0
19	2.25
20	2.5

You can click and drag to highlight an area of cells. Once highlighted, you can use the icons across the top of the window to fill all the selected cells with a value.

A highlighted area of cells can also be changed by a percentage by using the Change By button. To increase a highlighted area of cells by 10 percent for example, select the cells, click on the Change By button and enter 10. To reduce by 50 percent, enter -50.

You can also fill a range of cells with values that are interpolated from the end points. This works over a row, column or 2-dimensional area. To fill values over a two dimensional area, fill the four corners of the area with cell values. Then click and drag to select the area encompassed by those corner cells. Click on the Auto Fill button. The software will calculate and fill the correct values for all highlighted cells.

Once the maps are set up, you can write to the ECU in the PSC1. To write to the ECU, the ignition must be on so that the PSC1 is powered up. The engine must be off so that tach pulses are not present during programming. To write to the ECU press the Write Data to the ECU button. The operation of writing the data will also save the configuration and map information in the current file that is open. You can also upload from the ECU using the Read Data from the ECU button. You can then save or modify the data.

Operation:

Once the data is loaded into the PSC1, the engine can be started. From the main screen, the Real Time pull down can be used to observe a variety of operating parameters. The All option brings up a window that displays MAF voltage and RPM as well as cell value. The All window can be enlarged to full screen size to make it easy to read while working on the engine. The RPM and Voltage options display analog gauges that show those parameters. The All, RPM and Pressure options can all be displayed simultaneously.