2MV
1-4-34
7800 Broken external thermistor
wire
The external thermistor deliv-
ers 0.3V or more.
Defective connec-
tor cable or poor
contact in the con-
nector.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Temperature sensor and engine PWB
(YC29)
Defective tempera-
ture sensor.
Replace the temperature sensor.
Defective PWB. Replace the engine PWB check for correct
operation (see page 1-5-45).
7810 Short-circuited external
thermistor wire
external thermistor delivers
3V or more.
Defective connec-
tor cable or poor
contact in the con-
nector.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Temperature sensor and engine PWB
(YC29)
Defective tempera-
ture sensor.
Replace the temperature sensor.
Defective PWB. Replace the engine PWB check for correct
operation (see page 1-5-45).
7901 Drum unit K 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.
Mismatch of reading data from
two locations occurs eight
times successively.
Mismatch between writing
data and reading data occurs
eight times successively.
Poor contact in the
connector termi-
nals.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Drum unit (K) and drum connect PWB(YC5)
drum connect PWB and engine connect
PWB (YC4)
Engine connect PWB and engine PWB
(YC9)
Defective drum
PWB.
Replace the drum unit K (see 1-5-16).
Defective PWB. Replace the engine PWB check for correct
operation (see page 1-5-45).
7902 Drum unit C 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.
Mismatch of reading data from
two locations occurs eight
times successively.
Mismatch between writing
data and reading data occurs
eight times successively.
Poor contact in the
connector termi-
nals.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Drum unit (C) and drum connect PWB(YC3)
drum connect PWB and engine connect
PWB (YC4)
Engine connect PWB and engine PWB
(YC9)
Defective drum
PWB.
Replace the drum unit C (see 1-5-16).
Defective PWB. Replace the engine PWB check for correct
operation (see page 1-5-45).
Code Contents Causes
Check procedures/
corrective measures
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