Kyocera TASKalfa 6501i Service Manual page 473

Code Contents
7221 Broken LSU thermistor wire
The sensor input sampling is
greater than 230.
7231 Short-circuited LSU therm-
istor
The sensor input sampling is
less than 69.
Related parts
LSU thermistor
LSU relay PWB REPLACE the LSU relay PWB.
Engine PWB
LSU thermistor
LSU relay PWB Replace the LSU relay PWB.
Engine PWB
1-4-113
Check procedures/
corrective measures
1. Confirm LSU is displayed by U139
temperature and humidity (see page 1-
3-82).
2. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
Laser scanner unit and LSU relay PWB
(YC3)
LSU relay PWB (YC2) and Engine PWB
(YC11)
3. If the wiring is disconnected, shorted or
grounded, replace the wiring.
4. Replace the laser scanner unit (see
page 1-5-44).
1. Check the engine software and upgrade
to the latest, if necessary.
2. Replace the engine PWB (see page 1-5-
83).
1. Confirm LSU is displayed by U139
temperature and humidity (see page 1-
3-82).
2. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
Laser scanner unit and LSU relay PWB
(YC3)
LSU relay PWB (YC2) and Engine PWB
(YC11)
3. If the wiring is disconnected, shorted or
grounded, replace the wiring.
4. Replace the laser scanner unit (see
page 1-5-49).
1. Check the engine software and upgrade
to the latest, if necessary.
2. Replace the engine PWB (see page 1-5-
83).
2N8/2N7