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CM2150 Electronic Control System – 019-036   Engine Brake Level Switch

General Information

 TOC

The engine brake level switch determines the percentage of engine braking power that will be applied when the engine brakes are activated. The engine brake ON/OFF switch needs to be turned ON to activate the engine brake system. Vehicles can be wired with a 2 or 3 position switch.

  
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Resistance Check

 TOC

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

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

Adjust the multimeter to measure resistance

Three Position Switch
Switch Position Terminal A – Engine Brake Selector Signal Number 1 Terminal B – Engine Brake Selector Signal Number 2
1 Closed Open
1 Open Closed
2 Open Closed
2 Closed Open
3 Closed Closed
Two Position Switch
Switch Position Terminal A – Engine Brake Selector Signal Number 1 Terminal B – Engine Brake Selector Signal Number 2
1 Closed Open
1 Open Closed
2 Closed Closed

Check the resistance for each position of the 2 or 3 position switch. An open circuit must have a resistance greater than 100k ohms. A closed circuit must have a resistance of 10 ohms or less.

If the multimeter does not show the correct values in both tests, the switch has failed. Refer to the OEM troubleshooting and repair manual for replacement procedures.

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Last Modified:  18-Aug-2006
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