Poor Acceleration or Response

TM 9-2320-312-24-2

Troubleshooting Section

Electronic System

i01642129

Poor Acceleration or Response

1. Connect ET to the cab data link connector.

SMCS Code: 1000; 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".

Customer Specified Parameters

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

the fuel limit for fuel ratio control (FRC).

Electronic system

While the vehicle is operating under full load, the

Cold Mode operation

parameters should meet the following conditions:

Malfunction of an individual cylinder

The fuel position is equal to the rated fuel limit.

Power Train Data Link

The fuel position is less than the FRC limit.

ECM or Personality Module

If the fuel position is equal to the rated fuel limit

and the fuel position is less than the FRC limit,

Torque limit switch

the electronics are operating correctly.

Theft Deterrent

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

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

Injection actuation pressure

FRC limit, perform the following tests in order:

Combustion problem

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

switch to the ON position. Check the boost

Recommended Actions

pressure on the ET status screen. When the

engine is OFF, the boost pressure should be

Perform the following diagnostic procedures in

0 kPa (0 psi).

order:

Cold Mode Operation

Customer Specified Parameters

Note: This is normal operation if the problem occurs

1. Check Customer Specified Parameters.

only after start-up in cold weather.

2. Verify that the complaint is not normal operation

1. Connect ET to the cab data link connector.

(programmed parameter).

2. Use ET to verify that the engine has progressed

3. Connect Caterpillar Electronic Technician (ET) to

from cold mode. An active cold mode is indicated

the cab data link connector.

in the upper corner of any status screen.

4. Check the following parameters:

Individual Cylinder Malfunction

"Rating Number"

1. Ensure that the electronic unit injector connector

(J300/P300) is fully connected and ensure that

"Top Engine Limit"

the electronic unit injector connector (J300/P300)

is free of corrosion.

"Vehicle Speed Limit"

2. Ensure that the ECM engine harness connector

"Lower Gears Engine RPM Limit"

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

engine harness connector (J2/P2) is free of

"Intermediate Gears Engine RPM Limit"

corrosion.

"Gear Down Protection Engine RPM Limit"

5. Set each parameter to the parameter's maximum

value one at a time and determine whether the

problem is corrected.