CM850 Electronic Control System – 019-023   Cruise Control or PTO Set/Resume Select Switch

The cruise control/PTO set/resume select switch has two positions: SET/COAST and RESUME/ACCEL.

The switch can be used for: Cruise Control SET/COAST and RESUME/ACCEL, PTO INCREASE/DECREASE, IDLE INCREASE/DECREASE, ROAD SPEED GOVERNOR INCREASE/DECREASE, DIAGNOSTIC FAULT CODE INCREASE/DECREASE. For additional information, see Section F.

The operator can set the vehicle cruising speed when the switch is in the SET/COAST position. The SET/COAST position can also be used to reduce the vehicle cruising speed. Hold the switch in the SET/COAST position and the vehicle will coast down to a lower speed. When the select switch is released, the cruising speed will be reset.

NOTE: Some OEM’s have switches labeled SET/ACCEL and RESUME/COAST.

The operator can resume cruise control, after clutching or braking, by moving the switch to RESUME/ACCEL. The vehicle speed will return to the last set mph.

The RESUME/ACCEL position can also be used to increase the vehicle cruising speed. Hold the select switch in the RESUME/ACCEL position and the vehicle will increase in speed. When the switch is released, the cruising speed will be reset.

The cruise control/PTO set/resume switch circuit consists of the switch return, the cruise control/PTO resume/accel switch signal, cruise control/PTO set/coast switch signal and the vehicle mounted switch.

If INSITE™ is available, monitor the cruise control/PTO set/resume select switch for proper operation. If not, follow the troubleshooting procedures in this section.

Label the wires with the location on the switch or the wire number. Remove the three electrical connectors from the switch.

Adjust the multimeter to measure resistance.

Touch one multimeter probe to the center terminal of the switch. Touch the other multimeter probe to the RESUME/ACCEL terminal of the switch.

Hold the switch in the SET/COAST position. The multimeter must show an open circuit (100k ohms or more) when the switch is held in the SET/COAST position and after it is released. If the circuit is not open, the switch has failed.

Refer to the OEM troubleshooting and repair manual for replacement procedures.

Hold the switch in the RESUME/ACCEL position. The multimeter must show a closed circuit (10 ohms or less) when the switch is held in the RESUME/ACCEL position.

When the switch is released, the multimeter must show an open circuit (100k ohms or more). If the multimeter does not show the correct values in either test, the switch has failed.

Refer to the OEM troubleshooting and repair manual for replacement procedures.

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

Touch one multimeter probe to the center terminal of the switch. Touch the other multimeter probe to the SET/COAST terminal of the switch.

Hold the switch in the SET/COAST position.

The multimeter must show a closed circuit (10 ohms or less) while the switch is held to the SET/COAST position.

When the switch is released, the multimeter must show an open circuit (100k ohms or more). If the multimeter does not show the correct values in either test, the switch has failed.

Refer to the OEM troubleshooting and repair manual for replacement procedures.

Move the switch to the RESUME/ACCEL position.

The multimeter must show an open circuit (100k ohms or more) when the switch is held in the RESUME/ACCEL position and when it is released. If the circuit is not open, the switch has failed.

Refer to the OEM troubleshooting and repair manual for replacement procedures.

Adjust the multimeter to measure resistance.

Touch one multimeter probe to the RESUME/ACCEL terminal of the switch. Touch the other multimeter probe to the chassis ground. Move the switch to the SET/COAST position then to the RESUME/ACCEL position. Measure the resistance.

The multimeter must show an open circuit (100k ohms or more) when the switch is in all positions. If the circuit is not open, the switch has failed. Refer to the OEM troubleshooting and repair manual for replacement procedures.

Touch one multimeter probe to the SET/COAST terminal of the switch. Touch the other multimeter probe to chassis ground. Move the switch to the RESUME/ACCEL position, then to the SET/COAST position. Measure the resistance.

The multimeter must show an open circuit (100k ohms or more) when the switch is in all positions. If the circuit is not open, the switch has failed. Refer to the OEM troubleshooting and repair manual for replacement procedures.