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FAULT CODE 237

External Speed Command Input (Multiple-Unit Synchronization) - Data Erratic, Intermittent, or Incorrect

Overview


CODE

REASON

EFFECT

Fault Code: 237

External Speed Command Input (Multiple-Unit Synchronization) -

The primary engine and secondary engines are shut

PID:

Data Erratic, Intermittent, or Incorrect. Duty cycle of input throttle

down with increasing time after alert if hard-coupled.

SPN: 644

signal pin of the engine harness is less than 3 percent or more

Only the secondary engine(s) are shut down with

FMI: 2

than 97 percent.

increasing time after alert if soft-coupled.

LAMP: Amber



SRT:



Multiple Unit Synchronization Switch 1 Circuit - Industrial and M


Circuit Description


The primary engine outputs a throttle duty cycle signal on the original equipment manufacturer (OEM) actuator pulse width modulated (PWM) output supply pin. This signal is received by the secondary engine(s) and is used as the throttle input. To complete this circuit, a 5 volt supply is provided by the OEM and connected to the intermediate speed control/validate switch pin of the secondary engine(s).


Component Location


The pulse width modulated output supply is located in the engine harness 50-pin connector.

Shop Talk


The secondary engine(s) expect to see a duty cycle signal that varies between 3 and 97 percent. A signal less than 3 percent or greater than 97 percent will generate Fault Code 237 in the secondary engine(s).


Refer to Troubleshooting Fault Code t05-237.


Last Modified: 28-Nov-2012

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