CM2150 Electronic Control System – 019-270   Multi Unit Synchronization Switch

The Multiple Unit Synchronization feature allows two or more engines to be controlled by a single throttle input. One engine is configured as the primary engine, all other engines
must be configured as secondary.

If INSITE™ electronic service tool is available, monitor the switch for proper operation. If
not, follow the troubleshooting procedures in this section.

Locate the desired ON/OFF toggle switch. Remove and tag the two connectors from the terminals on the switch. Touch the multimeter probes to the terminals on the switch.

Move the switch to the OFF position and measure the resistance.

The multimeter
must show an open circuit (100K ohms or more).

If the circuit is
not open, the switch is damaged and
must be replaced. Refer to the OEM troubleshooting and repair manual for the replacement procedures.

Move the switch to the ON position and measure the resistance.

The multimeter
must show a closed circuit (10 ohms or less).

If the circuit is
not closed, the switch is damaged and
must be replaced. Refer to the OEM troubleshooting and repair manual for the replacement procedures.

If the resistance value is correct, the switch
must still be checked for a short circuit to ground.

Touch one of the multimeter probes to one of the switch terminals. Touch the other probe to chassis ground. Move the switch to the ON position and measure the resistance.

The multimeter
must show an open circuit (100K ohms or more).

If the circuit is
not open, the switch is damaged and
must be replaced. Refer to the OEM troubleshooting and repair manual for replacement procedures.

If the switch passes all of the previous checks, the circuit
must be checked for an open circuit, a short circuit to ground, a short circuit from pin-to-pin, and a short circuit to an external voltage source.