6
Tech Tips
Do not automatically assume the ECM motor has
failed.
Follow this guide completely before replacing
it.
When it is necessary to disconnect the power from
the HVAC system, it is always good practice to
verify that voltage has been disconnected
with a
voltmeter.
A True- RMS meter is not needed to check high
voltage or low voltage (communication voltage) to
the motor.
Always pull on the connector and not the wires.
Most connectors are also keyed. Reconnecting a
connector the wrong way could damage the motor.
When checking any plug connector, the meter leads
are most likely larger than the terminals or socket.
Using thin leads will prevent the terminals from
being damaged by voltage checks. Thinner leads
are also available in a 90º angle as needed. Go to
thedealertoolbox.com
for part numbers and ordering
information if needed.
TECH TIP #1
TECH TIP #2
TECH TIP #3
TECH TIP #4
TECH TIP #5
TECH
TIPS