9. Check for a disconnected or an open circuit or faulty potentiometer on the throttle or speed
circuit. The controller may not be detecting it in the circuit. Do a continuity test. See
“Testing the Throttle Control Potentiometer” see section 10.
10. If the code 8 always shows after completing all the above tests, the controller will need to
be replaced. Complete the following tests before changing the controller.
Note: Controllers can be damaged by loose connections, static electricity and water
on electrical components such as on or in the controller and motors.
11. Check for loose or burnt connections on the controller, batteries, cables and the circuit
breaker. Make the sure the circuit breaker is not damaged (burnt or cracked).
12. Test the chassis drive motor harness for broken wires. Disconnect the plug labeled
“Traction” on the Trio controller. Connect a digital multi-meter into the pins of the plug on
the two large wires. Set the meter for Ohms (resistance). The resistance should be .4 to .6
ohms on the 748010, 748010-1, 241260 and 241265 chassis drive motors (these have a
black drive wheel) on the SCVs. The 281400 and 241400 chassis drive motors on the
ER26s and ER2832s (this has red or dark blue wheel) they should have resistance of 3.9
to 5.7 ohms. Turn the steering wheel slowly in both directions until it stops several times.
Monitor the meter while turning. The resistance should not change or vary while turning.
Any variation even .1 ohm would be indicate a broken wire, which could cause spikes and
surges, that could damage the Trio controller permanently.
9. Trouble Shooting the Code 8 Error
9. Check for a disconnected or an open circuit or faulty potentiometer on the throttle or speed
circuit. The controller may not be detecting it in the circuit. Do a continuity test. See
“Testing the Throttle Control Potentiometer” see section 10.
10. If the code 8 always shows after completing all the above tests, the controller will need to
be replaced. Complete the following tests before changing the controller.
Note: Controllers can be damaged by loose connections, static electricity and water
on electrical components such as on or in the controller and motors.
11. Check for loose or burnt connections on the controller, batteries, cables and the circuit
breaker. Make the sure the circuit breaker is not damaged (burnt or cracked).
12. Test the chassis drive motor harness for broken wires. Disconnect the plug labeled
“Traction” on the Trio controller. Connect a digital multi-meter into the pins of the plug on
the two large wires. Set the meter for Ohms (resistance). The resistance should be .4 to .6
ohms on the 748010, 748010-1, 241260 and 241265 chassis drive motors (these have a
black drive wheel) on the SCVs. The 281400 and 241400 chassis drive motors on the
ER26s and ER2832s (this has red or dark blue wheel) they should have resistance of 3.9
to 5.7 ohms. Turn the steering wheel slowly in both directions until it stops several times.
Monitor the meter while turning. The resistance should not change or vary while turning.
Any variation even .1 ohm would be indicate a broken wire, which could cause spikes and
surges, that could damage the Trio controller permanently.
Page 41
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