Troubleshooting without a Diagnostic Code

TM 9-2320-312-24-2

Troubleshooting Section

Troubleshooting without a

"PTO Top Engine Limit" with the PTO On/Off

Switch turned ON.

Diagnostic Code

"PTO Vehicle Speed Limit" with the PTO On/Off

Switch turned ON.

i01858296

4. Set each parameter to the parameter's maximum

Can Not Reach Top Engine

value one at a time and determine whether the

RPM

problem is corrected.

Check Cold Mode Operation.

SMCS Code: 7569

Note: This is normal operation if the problem occurs

Probable Causes

only after start-up in cold weather.

Note: If this problem occurs under load, refer to

1. Connect the electronic service tool to the cab

Troubleshooting, "Low Power/Poor or No Response

data link connector.

to Throttle".

2. Monitor the electronic service tool in order to

The probable root causes are listed in order below:

verify that the engine has progressed from Cold

Mode.

Customer Specified Parameters (normal

operation)

An active Cold Mode is indicated in the upper

corner of any status screen.

Cold Mode operation

Check the Accelerator Pedal Position

Accelerator pedal position sensor

Sensor.

Vehicle speed signal

1. Use the Cruise/Idle On/Off switch to put the

Fuel Supply

engine in Idle mode.

Dedicated PTO switch on or torque limit switch

2. Vary the engine rpm with the Set/Resume

always on

switches.

If both of the following conditions are met, connect

Recommended Actions

the electronic service tool and monitor the status of

the accelerator pedal position sensor.

Perform the following diagnostic procedures in

order:

The engine is stable by using idle mode to control

the engine rpm.

Check Customer Specified Parameters

The engine is unstable by using the accelerator

1. Verify that the complaint is not normal operation

pedal position sensor.

(programmed parameter).

If the status of the accelerator pedal position sensor

2. Connect an electronic service tool to the cab

is unstable, refer to Troubleshooting, "Accelerator

data link connector.

Pedal (Throttle) Position Sensor Circuit - Test".

3. Check the following parameters:

Vehicle Speed Signal

"Vehicle Speed Limit"

Monitor the vehicle speed signal. Ensure the

accuracy of the vehicle speed signal by comparing

"Lower Gears Engine RPM Limit"

the vehicle speed signal to the actual vehicle speed.

"Intermediate Gears Engine RPM Limit"

If the vehicle speed is greater than the VSL, the

engine rpm is limited to the programmed "VSL

"Gear Down Protection Engine RPM Limit"

Protection". If a problem is discovered, refer to

Troubleshooting, "Vehicle Speed and Speedometer

"Top Engine Limit"

Circuit - Test".

"VSL Protection"