ET Status Screen-continued -807640268

TM 9-2320-312-24-2

Troubleshooting Section

4. If ET indicates "Bad Vehicle Speed", the vehicle

If ET indicates "Bad Vehicle Speed", "Vehicle

speed signal is erratic or intermittent. This relates

Speed < Limit", or "Vehicle Speed >= Limit" go

to cruise control only.

to Step 4.

If ET indicates "Vehicle Speed < Limit", the

2. If ET indicates "Switch Turned Off", the ECM has

vehicle speed signal was lost at least briefly. This

detected an open circuit in the on/off switch

pertains to cruise control only.

circuit. This pertains to the cruise control, the

idle control or the PTO. Perform the following

If ET indicates "Vehicle Speed >= Limit", the

tests in order:

vehicle speed signal exceeded the programmed

idle/PTO vehicle speed limit or the vehicle speed

a. Ensure that the operator has not actually

limit is erratic or intermittent. This pertains to idle

turned off the cruise control on/off switch or

control and PTO control only.

the PTO on/off switch.

If ET indicates a "Set SW Timeout", then either

b. Check the ET status screen while the switch

the set switch was depressed by the operator

is being used. If the problem is not apparent

longer than 15 seconds, or the circuit has a

check the switch and the wiring.

short. The cruise control switch must be turned

off and then turned on before the cruise control

c. If the problem is related to the cruise control

will work.

or idle control refer to Troubleshooting, "Cruise

Control Circuit - Test", Troubleshooting,

If ET indicates a "Res SW Timeout", then either

"Service Brake Pedal Position (Switch 1)

the set switch was depressed by the operator

Circuit - Test", and Troubleshooting, "Clutch

longer than 15 seconds, or the circuit has a

Pedal Position Switch Circuit - Test".

short. The cruise control switch must be turned

off and then turned on before the cruise control

d. If the problem is related to the PTO refer to

will work.

Troubleshooting, "PTO Switch Circuit - Test".

Perform the following diagnostic procedure in

3. If ET indicates "Brake", "Clutch", or "Neutral", the

order:

ECM has detected an open circuit in the switch

circuit for the service brake, the switch circuit

a. Inspect the vehicle speed sensor for debris on

for the clutch or the transmission neutral switch

the sensor. Inspect the vehicle speed circuit.

circuit. Perform the following tests in order:

b. Check the vehicle speed that is displayed

a. Ensure that the operator has not actually

on the ET status screen while the vehicle

depressed the service brake pedal or the

is parked. Adjust the engine rpm up and

clutch pedal. Also ensure that the operator

down. Also check the vehicle speed while the

has not actually shifted the transmission to

vehicle is being driven in order to determine

neutral.

that the vehicle speed that is indicated by ET

does not vary significantly from the vehicle

b. Check the ET status screen while the service

speed that is indicated by the speedometer.

brake or the clutch is being used. If the

If the problem is not apparent, refer to

problem is not apparent check the switches.

Troubleshooting, "Vehicle Speed Circuit -

Check the service brake switch for the air

Test".

system. Ensure that the treadle valve is

operating freely. A treadle valve that is not

c. Inspect both ECM connectors for moisture.

operating freely can cause pressure spikes.

Refer to Troubleshooting, "Electrical

Check the clutch switch adjustment and the

Connectors - Inspect".

return spring.

Note: Full Feature systems require the transmission

c. If the problem is related to the cruise control

style parameter to match the switches that are