Intermittent Low Power or Power Cutout

TM 9-2320-312-24-2

Troubleshooting Section

2. Check the fuel quality. Refer to Special

i01857376

Publication, LEBT3477, "Truck Performance and

Intermittent Low Power or

Driveability Diagnostic Guide".

Power Cutout

3. Check the fuel pressure. Refer to Testing and

Adjusting, "Fuel System Pressure - Test".

SMCS Code: 7569

4. Ensure that the fuel system has been primed.

Probable Causes

Refer to Testing and Adjusting, "Fuel System -

Prime".

The probable root causes are listed in order below:

5. Check for fuel supply lines that are restricted.

Electrical connections

6. Check the fuel filters.

Engine Monitoring

7. If the temperature is below 0 C (32 F), check

Battery power or ground to the ECM

for solidified fuel (wax).

Electronic system

Engine Speed/Timing Sensors

Accelerator pedal position sensor

Check the engine speed/timing sensors.

Vehicle speed signal

Refer to Troubleshooting, "Engine Speed/Timing

Circuit - Test".

Power train data link

Low Injection Actuation Pressure

Fuel supply

Torque limit switch

1. Check the engine oil level. Engine oil is used to

activate the high pressure hydraulic pump.

Low injection actuation pressure

2. Ensure that the engine oil meets the

recommendations of the engine manufacturer.

Recommended Actions

Refer to Operation and Maintenance Manual for

further details.

Perform the following diagnostic procedures in

order:

3. Crank the engine and monitor the injection

actuation pressure and the output of the injection

Electrical Connectors

actuation pressure control valve. The high

pressure oil system is operating properly if the

Check the vehicle harness and the connectors.

pressure output is a minimum of 6 MPa (870 psi).

Refer to Troubleshooting, "Electrical Connectors

- Inspect".

4. Connect ET and check for event code 164-11

(Injection Actuation Pressure System). If a 164-11

Engine Monitoring

event code has been logged recently, refer to

Troubleshooting, "Injection Actuation Pressure

System-Test".

1. Check the parameters for "Engine Monitoring".

2. Connect the electronic service tool to the cab

ECM or Personality Module

data link connector.

Check the ECM or the Personality Module.

3. Check for diagnostic codes that are capable of

derating the engine when "Engine Monitoring" is

Refer to Troubleshooting, "ECM Memory - Test".

programmed to "Derate" or "Shutdown".

110-00 High Coolant Temperature Warning (61)

110-11 Very High Coolant Temperature (61)

111-11 Very Low Coolant Level (62)