Surging Run Condition; Engine Speed Does Not Change - Ariens Sno-Thro Deluxe 24 Service Manual

c. If no voltage is present at the injector, check voltage
at both the red and white wires on the12-pin ECU
connector. See Figure 166.
If no voltage is present at the ECU, replace ECU. If voltage
is present at the ECU, check wires for kinks or damage. If
damage is present repair wires if possible, or replace
throttle body. See Figure 167.
Figure 166

Surging Run Condition

If the AC output wire from the engine charging system is
damaged, it may cause an intermittent short. This will result
in erratic running such as the engine over revving or
"popping" through the exhaust.
1. Check the engine wiring and wiring under the
handlebar to verify that it is not damaged.

Engine Speed Does Not Change

If engine speed does not change when using the
potentiometer (throttle control), check the following:
1. Set a multi-meter to ohms and measure the
potentiometer resistance. See Figures 168 and
Figure 169.
a. Unplug the 14-pin connector from the ECU.
b. Position the red probe on the terminal of the red wire
at the potentiometer (Pin 5 in Figure 168) and the
black probe on the terminal of the
green / white wire.
The potentiometer output should measure 0 – 5000 ohms.
If ohm reading measures close to 0 at full throttle and close
to 5000 at low-idle, potentiometer is operating normally. If
ohm reading stays constant at either position, replace
potentiometer.
EN – 66
Figure 167