ECM pmCAN Module Instruction Manual page 3

Quickstart Manual
The PM sensor has three conditions of operation: seeding, normal operation,
and fouled. Seeding is necessary before normal operation begins and this will
typically take a clean and dry sensor 4 minutes at 1.5 mg/m3. When the PM
level is doubled, the seeding time is halved. When the PM level is halved, the
seeding time is doubled. There will be a slight to moderate reseeding time
required each time the sensor (or engine) is stopped and restarted. Fouled
sensors can be identified by pinned or "-1" PM and PN outputs and a VHV of
less than 900V. This requires that the sensor be blown out with air or cleaned
(see Appendix G).
Mount the sensor vertical so that water can drain out of it and just finger-
tighten it. The material it is made out of is a little sticky so the sensor won't
unwind on its own. Make sure the mounting boss's threads are clean and
straight before screwing the sensor in. Sometimes you'll need a wrench to take
it out, so go easy. Wait until the sensor cools because it swells a little with
heat. The sensor is made out of plastic so be gentle with it.
For best results, each time before you install the sensor, first blow it out with
compressed air for about 10 seconds.