Precision Turbo and Engine BigStuff3 GEN3 Powertrain Controller Ignition Setup Tutorial - Manual (Page 18)

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as the crank signal. To confirm this, type the letters B-A-L simultaneously see B_A_L on page 30.
Make sure the PC is communicating with the GEN3 ECU. A small box will appear near the tool bar in
the upper right corner of the BigComm software screen. If the synchronizer ball is gray and is rotating
eccentrically within the box, the cam signal is occurring before the crank signal. If the ball turns red, a
problem exists, since the cam signal is occurring at the same time as the crank signal. To alleviate this
problem, the cam sync sensor needs to be replaced, or modified so that the cam sync pulse occurs
before the crank signal. Call BigStuff3 for further assistance if the ball remains red.
Setting the COP Crank Reference Setting – LS1
To find the Cam and Crank Falling Edges (the 1
st
crank falling edge after the cam falling edge), a
voltmeter and a jumper wire are required.. A crankshaft degree wheel is also recommended.
The following outlines the process.
• Roll the crankshaft back 30 o
Before Top Dead Center (BTDC). A crankshaft degree wheel or
balancer timing tape will help expedite the process. If neither is available, the following
formula can be used to measure the distance, on the surface of the balancer that equals 30
o
.
Multiply the diameter of the balancer by 3.14. Divide the result by 360, and then
multiply by 30 (representing the 30
o
).
Example based on a 7” balancer: 7 x 3.14= 21.98. 21.98/360= .06105” (per
degree). .06105” x 30
o
=1.8316”. From the TDC mark on the balancer, measure
forward (clockwise) about 1-13/16” and make a mark, which will represent 30
o
BTDC.
• Next, make sure the main wire harness camshaft connector is attached to the stock LS1
camshaft sensor and the main wire harness Switched 12-Volt wire is connected and “live”. The
main harness battery connections also must be in place.
• Attach the Voltmeter’s red lead to the main wire harness terminal E3 (Signal) and the
Voltmeter’s black lead to the main wire harness terminal J2 (Gnd). These terminals are
attached to wires routed back to the camshaft sensor. The easiest way to accomplish this is to
insert sewing needles between the Voltmeter’s positive and negative alligator clamps, and then
push them into the aforementioned header connector terminals. Also, a jumper wire must
also be connected from pin J2 to the negative side of the battery. This test procedure will
not work without this ground strap.
Note:
Make sure the probes (sewing needles) inserted into the E3 and J2 terminals do not
touch each other. Doing so will damage the main wire harness!
Note: It is important to use probes with tapered tips (like sewing needles) rather than blunt
tipped probes (like paper clips) to avoid damaging the main harness header connector
terminals.