TCM FB20-8 - Load-Handling System (Orbitrol) Troubleshooting (3;3)

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3. TROUBLESHOOTING GUIDE
(10)
418
15
: Pump motor inverter unit upper/lower FET
short
Resets when the key switch is turned OFF.
419
19
: Pump motor inverter unit upper FET short
Resets when the key switch is turned OFF.
420
21
: Pump motor inverter unit lower FET short
Resets when the key switch is turned OFF.
① Check the battery cable connection (Check the
contactor secondary side for any negative (-) voltage
leaks).
Correct the cable.
② Remove the motor cables from the U, V and W
terminals.
–
③ Check for electrical leaks between the motor cable,
and the positive (+) and negative (-) terminals.
Correct the cable.
④ Check the bar and bolts that connect between the
drive and pump motor inverter units.
Retighten.
⑤ Check the harness for the CN1D-22 and -24
terminals on the pump motor inverter unit.
Correct the wiring.
⑥ Check the RCH (rapid charger resistor).
Repair the RCH.
⑦ Check the harness between CN1D-11/CN1D-12 and
CNCH on the drive motor inverter unit.
Correct the wiring.
⑧ Replace the pump motor inverter unit.
(11)
-
22
: Load short-circuit (Motor interphase short-
circuited)
Resets when the key switch is turned OFF.
-
91
: Overcurrent (Hard OCL detected)
Resets when the key switch is turned OFF.
① Check the pump motor cable U, V, and W terminals
and the areas around them for foreign material.
Remove the foreign material.
② Check the pump motor cable for looseness.
Retighten.
③ Check the pump motor for short circuit.
Correct the cable.
④ Check the pump motor inverter unit (CN1P-24, -22)
for proper connection.
Connect properly.
⑤ Check the harness for the CN1P-24 and -22
terminals on the pump motor inverter unit.
Correct the wiring.
⑥ Refer to the repair procedure for Error Code 308.
⑦ Refer to the repair procedure for Error Code 416.
⑧ Replace the pump motor.
⑨ Replace the pump motor inverter unit.