Engine Vibration

TM 9-2320-312-24-2

Troubleshooting Section

If the "Power Train Data Link" status screen

8. Check for air in the fuel system. Refer to Testing

indicates that the data link is limiting the power or

and Adjusting, "Air in Fuel - Test".

the rpm, verify that this is not normal operation. If

this is not normal operation, refer to the vehicle

Low Injection Actuation Pressure

OEM for repairs.

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

Camshaft Position Sensor

activate the high pressure hydraulic pump.

2. Ensure that the engine oil meets the

If the signal for the Camshaft Position Sensor is

recommendations of the engine manufacturer.

lost during engine start-up, additional time may be

Refer to Operation and Maintenance Manual for

required to start the engine. The engine may also

further details.

misfire during this time until the ECM determines

the proper firing order. Refer to Troubleshooting,

3. Crank the engine and monitor the injection

"Engine Speed/Timing Circuit - Test".

actuation pressure and the output of the injection

actuation pressure control valve. The high

Valve Lash

pressure oil system is operating properly if the

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

Refer to Systems Operation, Testing and Adjusting

for the correct procedure.

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

Injection Actuation Pressure system fault. If an

164-11 event code has been logged recently,

i01668916

refer to Troubleshooting, "Injection Actuation

Engine Vibration

Pressure System-Test".

SMCS Code: 7569

Accelerator Pedal Position Sensor

Refer to Testing and Adjusting for information on

1. If the engine is in the cruise control mode and the

determining the cause of this condition.

problem does not occur, check the accelerator

pedal position sensor.

Probable Causes

2. Use the Cruise/Idle On/Off Switch to put the

Vibration damper

engine in Idle mode.

Engine supports

3. Vary the engine rpm with the set/resume

switches.

Driven equipment

If both of the following conditions are met,

Engine misfiring or running rough

connect ET and monitor the status of the

accelerator pedal position sensor.

Recommended Actions

The engine is stable by using idle mode to

control the engine rpm.

Vibration Damper

The engine is unstable by using the accelerator

Check the vibration damper for damage. Install a

pedal position sensor.

new vibration damper, if necessary. Inspect the

mounting bolts for damage and/or wear. Replace

If the status of the accelerator pedal position

any damaged bolts. Refer to Disassembly and

sensor is unstable, refer to Troubleshooting,

Assembly, "Vibration Damper and Pulley - Remove

"Accelerator Pedal (Throttle) Position Sensor

and Install".

Circuit - Test".

Engine Supports

Power Train Data Link

Inspect the mounts and brackets while you run the

1. Check the "Power train Data Link". Ensure that

engine through the speed range. Look for mounts

the SAE J1939 data link is not limiting the power.

and brackets that are loose and/or broken. Tighten

all of the mounting bolts. Install new components, if

2. Connect ET to the cab data link connector.

necessary.

3. Monitor the "Power Train Data Link" status screen

while the vehicle is experiencing problems.