Section 7
Electrical
Model 220 PTO Wiring Information
Wiring of the Current Model Model 220 is different from previous version of the Model Model 220. Please see the information
below for basic wiring and functionality.
1) If equipped, the factory PTO dash switch will tell the VIC to go to PTO mode.
2) J124 connector on the transmission needs 12V to tell the Allison TCM to enable PTO mode.
3) J125 connector on the transmission is a ground output signal from the Allison TCM for the PTO.
4) J126 connector on the transmission is a 24V output signal from the VIC when the PTO dash switch is on.
5) J128 connector on the transmission needs a ground to feedback to the VIC for PTO engaged status (must occur within 3-4
seconds after PTO switch). Option 1: Provide a ground from the PTO engaged switch to J128. Option 2: J128 & J125 can be
spliced together for the feedback ground to the VIC. Please note: J128 & J125 will not mate together, so connectors will have to
be cut off and spliced.
6) Pin 10 of the 12-pin Remote PTO connector (P124) on the engine harness –OR- pin B of the 3-pin connector (J144) on the
engine harness needs a ground to feedback to the VIC for PTO engaged status. This performs the same function as item 5 above.
This is primarily used for remote set-ups outside the cab.
As an example for setting up a PTO if using the factory PTO dash switch and one pre-set RPM:
(Refer Figure 7.9)
A) Use J126 to drive your PTO solenoid. This is 24V, so you may need to use a relay if the PTO requires 12V or a ground.
B) Send 12V to connector J124 for the Allison TCM when the PTO is engaged. This 12V can be “borrowed” from the relay used in
step A) above.
C) Provide a ground to J128 for feedback to the VIC when the PTO is engaged. This can be done by either splicing J125 & J128
together or by running a separate wire from the switch directly on the PTO (if equipped) to J128. This ground must be applied
within 3-4 seconds after the PTO switch is enabled.
D) Set your desired engine RPM for pre-set speed with DAVIE. This is found under Customer Parameters.
Please note: This information relates only to setting up the mechanical PTO for operation. This does not address the additional
function of ESC (Engine Speed Control), as this is a separate function. Engine Speed Control must be enabled in the VIC
programming and requires a modified PRS file. Instructions for use of ESC follow.
Engine Speed Control (ESC)
ESC can be fixed (pre-programmed) engine speed or variable engine speed. The Euro 6 only has two pre-programmed engine
speeds N2 and N3. N VAR is available using the “SET+” and “SET-“ to increase and decrease speed.
To activate these speeds the ESC must first be enabled by providing a high signal (12-24V) on pin 12 of the 12-pin connector on the
engine harness (P124).
The N2 and N3 can then be activated by providing a high signal on pins 7 and 6 respectively of the 12-pin
connector on the engine harness (P124).
N VAR can be activated by providing a high signal on pin 8 of the 12-pin connector on the engine harness (P124).
(N refers to a Speed Set point)
If N VAR variable control is desired with the steering wheel switches:
A high signal (12-24V) is provided to pin 12 of the 12pin connector on the engine harness (P124).
A high signal is provided to pin 8 of the 12pin connector (P124).
Use the “SET+” and “SET-“steering wheel switches to bump the throttle up and down.
The parking brake must be set for proper functionality.
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