2NC/2NF/2NG/2NN/3P7/3P8/3P9
1-4-33
7800 Broken temperature sensor
wire
Input from temperature sensor
is 0.3 V (A/D value) or less
Outer temperature
sensor
1. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
Temperature sensor and main/engine
PWB (YC6)
2. If the wiring is disconnected, shorted or
grounded, replace the wiring.
3. Replace the temperature sensor.
Main/Engine PWB 1. Check the main/engine software and
upgrade to the latest, if necessary.
2. Replace the main/engine PWB (see
page 2-2-11).
7810 Short-circuited tempera-
ture sensor wire
Input from temperature sensor
is 0.3 V (A/D value) or more
Outer temperature
sensor
1. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
Temperature sensor and main/engine
PWB (YC6)
2. If the wiring is disconnected, shorted or
grounded, replace the wiring.
3. Replace the temperature sensor.
Main/Engine PWB 1. Check the main/engine software and
upgrade to the latest, if necessary.
2. Replace the main/engine PWB (see
page 2-2-11).
7900 Drum EEPROM error
No response is issued from
the device in reading/writing
for 5 ms or more and this
problem is repeated five times
successively.
DR PWB
1. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
DR PWB and main/engine PWB (YC9)
2. If the wiring is disconnected, shorted or
grounded, replace the wiring.
3. Replace the Drum unit (see page 1-5-
40).
Main/Engine PWB 1. Check the main/engine software and
upgrade to the latest, if necessary.
2. Replace the main/engine PWB (see
page 2-2-11).
Code Contents Related parts
Check procedures/
corrective measures
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