Ignition Key Switch

TM 9-2320-312-24-2

Troubleshooting Section

ECM power supply

Note: Crank the engine for 30 seconds. Allow time

for the starter motor to cool. Crank the engine up

Personality Module

to five times in order to purge the air from the high

pressure oil system.

ECM

Check Communications

Hydraulic Electronic Unit Injectors

1. Connect the electronic service tool to the cab

Engine speed/timing signal

data link connector.

Injection actuation pressure control system

2. Check the communications between the ECM

and the electronic service tool.

Engine software

3. Ensure that the ignition key switch is in the ON

Theft deterrent

position. Attempt to access one of the electronic

service tool status screens.

Fuel supply

If the electronic service tool indicates that the

Combustion problem

ECM will not communicate go to the next step. If

the ECM communicates go to "Engine Software".

Recommended Actions

Note: A new ECM has a Personality Module that

is not programmed. A Personality Module that

Perform the following diagnostic procedures in

is not programmed will cause this symptom.

order:

Accessing the ECM status in the electronic service

tool WinFlash Program without programming the

Ignition Key Switch

Personality Module will cause the engine not to

start or accessing the ECM status in the electronic

1. Connect an electronic service tool to the cab

service tool WinFlash Program without programming

data link connector.

the Personality Module will cause the engine not to

communicate. Cycling the ignition key switch from

2. Access the status of the ignition key switch.

the OFF to the ON position will correct this problem.

3. Slowly cycle the ignition key switch on and off

Engine Protection Devices

while the status of the ignition key switch is being

monitored. The status should indicate the state

of the switch.

1. Check aftermarket engine protection devices.

These devices usually interrupt power to the

If the ECM will not communicate and the ignition

ECM and the ECM will not communicate with the

key switch is in the ON position, refer to the next

electronic service tool.

step.

2. Check for the correct installation of the

Note: If the Idle Shutdown is used or the PTO

aftermarket engine protection device.

Shutdown Time is used, the status of the ignition

key switch may indicate that the switch is ON even

3. Check for the correct operation of the aftermarket

though the ignition key switch is turned to the OFF

engine protection device.

position.

Note: It may be necessary to disable the aftermarket

engine protection device before you continue.

Engine Oil Pressure

4. Verify the voltage supply at the ECM.

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

activate the high pressure hydraulic pump.

ECM Power Supply

2. Ensure that the engine oil meets the

recommendations of the engine manufacturer.

1. Verify that the ECM is receiving battery voltage.

Refer to Operation and Maintenance Manual for

further details.

2. Check the electrical power supply to the ECM.

3. Check for air in the high pressure oil system.

3. Check the power connection of the ECM and the

ground connection of the ECM.