CM2150 Electronic Control System – 019-064   Key Switch Battery Supply Circuit

The vehicle keyswitch supplies an input signal to the electronic control module (ECM) which turns the ECM on or off.

The Generator Set ECM Keyswitch supplies an input signal to all generator set electronic control modules (ECMs) which turns to ECM on or off.

For generator sets using the PowerCommand Supervisor 3100 mounted in the Generator Control Panel (GCP), the ECM keyswitch (1) is mounted on the Service Tool Connector Panel (2), located inside the main panel.

For generator sets using the PowerCommand Supervisor 3300 mounted in the Generator Interface Box, the ECM keyswitch (1) is mounted within the customer terminal box above the customer connection terminal connection strip (2).

Turn the keyswitch to the OFF position.

Disconnect the original equipment manufacturer (OEM) harness connector from the ECM.

Inspect the connector pins.

CAUTION  The leads must fit tightly in the connector without expanding the pins in the connector otherwise the connector will be damaged.

Adjust the multimeter to measure VDC.

Insert a test lead into the keyswitch input signal pin of the OEM harness connector. Connect the lead to the multimeter probe. Touch the other probe to a clean, unpainted surface on the engine block ground.

Turn the keyswitch to the ON position.

The measured voltage
must show battery voltage. If the measured voltage is more than 0.5 VDC below battery voltage, continue with the next step.

Disconnect the bulkhead connector.

Inspect the connector pins. Refer to the OEM troubleshooting and repair manual for the proper procedure.

Measure the voltage. Refer to the OEM troubleshooting and repair manual for the proper procedure.

The measured voltage
must show battery voltage. If the voltage is
not correct, there is a problem with the OEM harness wire, keyswitch, or battery connection.

Repair or replace the OEM harness, keyswitch, or check the battery connections. Refer to the OEM troubleshooting and repair manual for the proper procedures.