AMP EFI MS3Pro - 17 Injector Sequence Testing

To Next Page

To Previous Page

7.10 CAN bus / Testmodes 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL

• Idle Valve Homing Steps - This only applies to stepper idle valves. This setting determines how many steps

the motor should move during homing to ensure it has reached the home position. The number needs to be

large enough to close the valve from any unknown starting position. (This is because there is no position on

most automotive stepper IAC valves.)

• Idle Valve Step - the desired valve position if using a stepper IAC valve. Larger numbers should give a more

open valve and higher rpm.

• PWM idle duty% - the desired valve position if using a PWM IAC valve. Larger numbers should give a more

open valve and higher rpm.

(Note that some Bosch rotary PWM valves valves feature a failsafe mode so that zero ﬂow is at a midpoint, such

as 20% duty,; above that the valve operates as expected where more duty gives more airﬂow. Below this speciﬁc

point is a failsafe mode that allows airﬂow even if there is no control signal. This is readily observed during test

mode.)

There are three control buttons:

• Enable Test - Home Position - for stepper idle valves, this moves the valve through the number of homing

steps back to the home position. (If it doesn’t get all the way back to the stop, increase the number of homing

steps.) The valve will move to the run position shortly afterward.

• Enable Test - Run Position - enable test mode where the steps or duty setting controls the valve position

• Enable Test - In / Out Cycle - Moves the valve continously between the home and run position.

• Stop Testing - disable test mode and allow normal idle control to operate.

7.10.17 Injector Sequence Testing

This screen allows you to switch in and out of sequential injection on the ﬂy to evaluate how the engine runs in

different modes. You can make an engine running full sequential drop down to semi sequential or batch ﬁre, or

make an engine running semi sequential swap to batch ﬁre.

AMP EFI MS3Pro manual version 1.202, ﬁrmware 1.5.0, 4/21/2017 Page 276