CM2150 Electronic Control System – 019-282   Alternate Torque Switch

This switch is used to enable the alternate torque curve feature and switch up to and between two derated torque curves.

NOTE: This switch can be a simple ON/OFF switch or an optional 3-position switch. Use the correct section for the particular switch on your application.

ON/OFF Type of Switch

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.

3-Position Type of 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 instructions.

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 instructions.

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

Move the switch to the center position, and measure the resistance.

The multimeter
must show 1000 to 2000 ohms.

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

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.