Excessive Black Smoke

TM 9-2320-312-24-2

Troubleshooting Section

Electronic System

i01641977

Excessive Black Smoke

1. Connect ET to the cab data link connector.

SMCS Code: 1088-035; 7569

2. While the problem is occurring, check for

diagnostic codes that are related to the boost

Probable Causes

pressure sensor and the atmospheric pressure

sensor. If a diagnostic code is found, refer to

Troubleshooting, "Engine Pressure Sensor Open

The probable root causes are listed in order below:

or Short Circuit - Test".

Air inlet system or exhaust system

3. Monitor the fuel position, the rated fuel limit and

the FRC fuel limit.

Valve lash

While the vehicle is operating under full load, the

Hydraulic electronic unit injector

parameters should meet the following conditions:

Electronic system

The fuel position is equal to the rated fuel limit.

ECM or Personality Module

The fuel position is less than the FRC fuel limit.

Recommended Actions

If the fuel position is equal to the rated fuel limit

and the fuel position is less than the FRC fuel

Perform the following diagnostic procedures in

limit, the electronics are operating correctly.

order:

4. If the fuel position is not equal to the rated fuel

Air Inlet System or Exhaust System

limit and/or the fuel position is not less than the

FRC fuel limit, perform the following tests in

order:

Check the air inlet system for restrictions or

leakage. Check the exhaust system for restrictions

5. When the engine is OFF, turn the ignition key

or leakage. Refer to Testing and Adjusting, "Air Inlet

switch to the ON position. Check the boost

and Exhaust System - Inspect".

pressure on the ET status screen.

Valve Lash

When the engine is OFF, the boost pressure

should be 0 kPa (0 psi).

Check the valve lash. Refer to Testing and Adjusting,

"Engine Valve Lash - Inspect/Adjust".

ECM or Personality Module

Hydraulic Electronic Unit Injector

Check the ECM or the Personality Module.

1. Ensure that the hydraulic electronic unit injector

Refer to Troubleshooting, "ECM Memory - Test".

connector (J300/P300) is fully connected and

ensure that the hydraulic electronic unit injector

connector (J300/P300) is free of corrosion.

i01405742

Excessive Valve Lash

2. Ensure that the ECM engine harness connector

(J2/P2) is fully connected and ensure that the

SMCS Code: 1105; 7569

engine harness connector (J2/P2) is free of

corrosion.

Note: This is NOT an electronic system problem.

3. Connect Caterpillar Electronic Technician (ET) to

Refer to Testing and Adjusting for information on

the cab data link connector. Use the Cylinder

determining the cause of this condition.

Cutout Test. Access the Cylinder Cutout Test

by selecting the "Diagnostic Menu" and the

"Diagnostics Test Menu". Run the Cylinder Cutout

Probable Causes

Test in order to disable each cylinder. Disabling

each cylinder allows the technician to isolate the

Lubrication

misfiring cylinders.

Valve lash

If the misfiring cylinder can be isolated to

a specific cylinder, refer to Troubleshooting,

Valve train components

"Injector Solenoid Circuit - Test".