47 Pump motor, Open
3.12 Pump Motor, Open (47)
Diagnostic code: 47
Situation Display: "47". All forklift truck operations inhibited. Line contactor OPEN and steering contactor HOLD.
Possible
cause
Faulty contact or wire breakage of pump motor cable, faulty pump motor, faulty contact or wire breakage of
pump inverter connector, faulty contact of DSP flat cable in pump inverter, wire breakage of main harness,
faulty logic unit power supply card, faulty pump inverter DSP card, faulty pump inverter, and when restarting
after motor shorted.
Trigger of
this code
Motor voltage is abnormal when power is turned ON.
Current does not flow when rotational speed instruction is requested.
Checks
(1) Disconnect battery plug, then perform inverter discharging work. See page 1-48.
(2) Check pump inverter and motor for cable looseness and
improper contact.
Normal Abnormal
(3) Disconnect pump motor cables from inverter.
Measure resistance of motor cables (U, V, and W phases). (4) Secure cable if loose.
Less than 1O 1O or more
(5) Check connector E-05 of pump inverter for looseness. (6) Measure resistance between terminals of both cable
ends (between U and U, V and V, and W and W).
Normal Abnormal Less than 1O 1O or more
(7) Disconnect connector E-05 of
pump inverter and remove DSP
cover. Check DSP flat cable for
looseness or wire breakage.
(8) Connect connector securely.
Normal Abnormal (9) Replace pump motor. (10) Replace motor cables.
Gate power
supply
(11) Check continuity between E-01-5 (502) and E-05-16
(502).
Check continuity between E-01-6 (503) and E-05-20 (503).
(12) Secure DSP flat cable if loose.
Replace inverter if wire breaks. See page 1-49.
Continuity No continuity
CHAPTER 2 TROUBLESHOOTING FOR CONTROL CIRCUITS
2-42
CAN
(13) Disconnect connector E-02 of logic unit.
Check continuity between E-02-5 (470) and E-05-3 (470).
Check continuity between E-02-6 (471) and E-05-4 (471).
Check continuity between E-05-14 (726) and E-05-15 (726).
Continuity No continuity
(14) Connect connector E-01 to logic unit, then turn ON
power again. (15) Repair or replace harness.
(16) Measure voltage between E-05-16 (502) and E-05-
20(503). Confirm value is 12V ± 1V.
Continuity No continuity
(17) Disconnect battery plug, then perform inverter discharging work. See page 1-48.
(18) Replace pump inverter DSP card. See page 1-53. (19) Replace logic unit power supply card. See page 1-58.
If fault remains
(20) Perform inverter discharging work, then replace pump
inverter. (DSP card is normal.) See page 1-49