Elevated Idle

TM 9-2320-312-24-2

Troubleshooting Section

Electrical Power Supply to the ECM

Note: The "Elevated Idle" status flag will be

activated if one of the above features is active.

Check power to the ECM. Refer to Troubleshooting,

"Ignition Key Switch Circuit and Battery Supply

Conditions

Circuit - Test".

Low Battery Elevated Idle

Note: If the ECM is not receiving battery voltage, the

ECM will not communicate.

The engine idle speed will be elevated to the value

that is programmed into the "Battery Monitor Low

Override Switches

Idle Engine Speed" parameter when all of the

following conditions occur:

1. Ensure that the ignition key switch is in the

ON position. Ensure that there are no override

System battery voltage is less than the value that

switches that are creating the problem.

is programmed into the "Battery Monitor & Engine

Control Voltage" parameter for 30 seconds.

2. Ensure that there are no aftermarket devices that

are preventing battery voltage from reaching the

The vehicle is stopped.

ECM.

The transmission is not in gear.

3. Start the engine and then connect Cat ET. Some

type of override switch is interrupting the power

The brake pedal is not depressed.

to the ECM under the following condition: If

communication occurs with the engine running

The clutch pedal is not depressed.

but no communication occurs with the key switch

in the ON position.

Cold Mode Elevated Idle

Personality Module (Flash File)

The engine idle speed will be elevated to the

value that is programmed into the "Warm Up Mode

Ensure that the correct personality module is

Idle Speed" parameter when all of the following

properly installed in the ECM.

conditions occur:

Note: The personality module that is provided in a

Cold mode is active.

new ECM is blank. The engine will not start and

the engine will not communicate with Cat ET until

The transmission is not in gear.

the personality module has been flashed. Refer to

Troubleshooting, "Flash Programming".

The brake pedal is not depressed.

ATA Data Link

The clutch pedal is not depressed.

Troubleshoot the ATA Data Link for possible

problems. Refer to Troubleshooting, "ATA (SAE

i01857351

J1587 / J1708) Data Link Circuit - Test".

Engine Cranks but Will Not

Start

i01623108

Elevated Idle

SMCS Code: 7569

Probable Causes

SMCS Code: 1000; 7569

The probable root causes are listed in order below:

Probable Causes

Ignition key switch

This condition does not indicate an electronic

system problem. The low idle speed may be

Engine oil pressure

elevated due to one of the following features:

ECM Communications

Low Battery Elevated Idle

Engine protection devices

Cold Mode Elevated Idle