0084-10 Vehicle Speed Rate of Change (36)

108

TM 9-2320-312-24-2

Troubleshooting Section

Troubleshooting:

System Response:

Perform the following diagnostic procedure: "Vehicle

Electronic System Response Vehicle speed is

Speed and Speedometer Circuit - Test"

set to 0 km/h (0 mph) and engine rpm is limited

to the programmed "VSL Protection". If the ECM is

Results:

providing the speedometer signal, the speedometer

will reflect the loss of speed when the problem

OK STOP.

occurs and the vehicle is moving.

Service Tool Display or Lamps Caterpillar

i01638694

Electronic Technician (ET) will display "DIAG" next

0091-08 Invalid Throttle Signal

to "Vehicle Speed" on the status screen while the

diagnostic code is active. The Check Engine Lamp

(32)

will illuminate.

SMCS Code: 1913-038

Engine Response The driver may think that the

engine power is low and that the engine is unable

Conditions Which Generate This Code:

to reach the expected rpm.

The ECM is not receiving a correct accelerator

Troubleshooting:

pedal position signal.

Perform the following diagnostic procedure: "Vehicle

System Response:

Speed and Speedometer Circuit - Test"

Electronic System Response The ECM returns the

Results:

engine to low idle when the problem is detected.

OK STOP.

Service Tool Display or Lamps Caterpillar

Electronic Technician (ET) will display "0%" and

i01638687

"DIAG" next to "Throttle Position" on the status

screen while the diagnostic code is active. The

0084-10 Vehicle Speed Rate of

Check Engine Lamp will illuminate.

Change (36)

Engine Response The engine will remain at low

idle while the diagnostic code is active.

SMCS Code: 1900

Troubleshooting:

Conditions Which Generate This Code:

This diagnostic code is likely to be caused by an

This condition involves the vehicle speed that is

open circuit in the signal circuit for the accelerator

changing at an impossible rate. This diagnostic

pedal position, or a significant change in the signal

code will not occur if the "VSL Protection" parameter

frequency.

is programmed to 2120 rpm.

Perform the following diagnostic procedure:

System Response:

"Accelerator Pedal (Throttle) Position Sensor Circuit

- Test"

Electronic System Response Engine rpm is limited

to the programmed "VSL Protection".

Results:

Service Tool Display or Lamps Caterpillar

OK STOP.

Electronic Technician (ET) will display "DIAG" next

to "Vehicle Speed" on the status screen while the

diagnostic code is active. The Check Engine Lamp

will illuminate.

Engine Response The driver may think that the

engine power is low and that the engine is unable

to reach the expected rpm.