6.1 Getting started 6 TUNING THE MS3PRO
• For functional testing, set the total number of injections to 65535 (the maximum) or for flow testing use your
chosen number. (When performing repeated tests at the same number, you need to enter 0, TAB out, then
enter the number you want and TAB out again.)
The injector testing mode called Sequence runs the injector in sequence up to the chosen injector. So if you have
six injectors and selected Injector D and Sequence, then the test mode will repeatedly fire Injector A, then Injector
B, then Injector C, then Injector D in turn, but will not fire injectors E and F. Set the chosen injector to the last one,
and you can use this to confirm the injectors are following the right firing order.
The Output Interval determines how long to go between each test firing of the injectors. If you want the injec-
tors to fire every 100 ms, you would enter 100. The screen shows the rpm this approximates to in full sequential.
Testing the fuel pump is straightforward; just buttons under Fuel Pump to turn it off and on. You will notice that
"Ready" lights up on the TunerStudio dash when the fuel pump is enabled. If you get no activity, try starting again.
However, if Ready lights up but the pump doesn’t run, you need to check you fuel pump relay and pump wiring. If
this is a new fuel system, make sure that the fuel system doesn’t leak and that it holds pressure. Note that some
aftermarket fuel pressure regulators, including most from Aeromotive, will hold pressure for only about 30 seconds
or so after shutdown even if the fuel system has no leaks. Most OEM fuel pressure regulators will hold pressure
much longer.
6.1.1.2 Coil test mode The coil test mode is useful to confirm you have the coils wired correctly and to check
dwell settings. (Do be careful as ignition coils put out a potential lethal voltage. Typically 30,000V or more.) To
enable coil testing:
• Select coils in the Test mode drop down.
• Choose your dwell time in milliseconds. Start low. e.g. 2.0ms.
• Choose which coil to test
• Set Coil testing mode to One
• If your coils are powered via the fuel pump relay as is recommended, set the fuel pump to On.
The Sequence mode and Output Interval work the same for coils as for the injectors. For example, a 4 cylinder
wasted spark engine at 6000rpm will fire a coil every 5ms, so each coil is fired every 10ms. Note that the test mode
does not allow dwell periods to overlap in the sequence mode, unlike normal operation where the dwell periods
overlap as required. (This is why traditional V8 distributor spark was weak at high revs - there was not enough time
to charge the single coil between sparks.)
6.1.1.3 Idle valve testing The idle valve has a separate test mode, also under the CAN bus / Testmodes menu.
The idle valve test mode can be used with the engine running or stationary, unlike the regular Output Test Mode.
Note that with a PWM idle valve or a five or six wire stepper valve, you may need to run a temporary fused 12V
supply to the valve if you normally take power from the fuel pump relay and are testing with the engine off.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 102
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