TCM FB10-7 Service Manual page 50

3. CONTROL SYSTEM
■ Checking procedure by error code
(1) Traveling system
No. Problem
01 Traveling power module
shorted
[303]
05 Traveling power
[303] module's upper FET is
short-circuited
Traveling power
06
module's lower FET is
[303]
short-circuited
Traveling power module
02
is open.
[304]
13 Traveling power
[304] module's phase "U" is
open .
Traveling power
14
[304] module's phase "V" is
open.
Traveling power
15
module's phase "W" is
[304]
open.
03 Traveling contactor
[305] (MD) shorted or sensor
circuit harness defective
Traveling contactor
04
(MD) is stuck open or
[306]
sensor circuit harness is
defective
07 Traveling contactor
[501] (MD) drive Tr is
defective (Tr3 on
CPU board), traveling
contactor coil is stuck
open or sensor circuit
harness is defective.
16 Fwd or Rev direction
[501] switch is defective.
Numbers in brackets are error codes that appear on the meter panel.
Error
Proceed with remedy in numerical order of encircled numbers.
The truck won't move.
① Check traveling power modules (TMDU,
(MD contactor does not TMDV, TMDW) and change if needed.
close.) (When changing any power module, change
(Traveling quick charge the power supply board, too.)
error: error code 69) ② Check harness between CN3R (power supply
(Occurrence is also board) and each power module, and repair or
detected.) change if needed.
③ Check harness between CN4-2 (CPU board)
and P3 terminal, and repair or change if
needed.
④ Check harness between CN4-8 (CPU board)
and P1 terminal, and repair or change if
needed.
⑤ If no defect is found throughout the above
steps, change power supply board.
Truck won't move.
① Check harness between CN2R (power supply
board) and CN8 (CPU board), and repair or
change if needed.
② C heck traveling power modules (TMDU,
TMDV, TMDW), and repair or change if
needed. When changing any defective power
module, change power supply board, too.
③ Check harness between CN3R (power supply
board) and each power module, and repair or
change if needed.
④ Check harness between CN4-2 (CPU board)
and P3 terminal, and repair or change if
needed.
⑤ Check harness between CN4-8 (CPU board)
and P1 terminal, and repair or change if
needed.
⑥ If no defect is found throughout the above
steps, change power supply board.
The truck won't move.
① Check traveling contactor (MD) (for welding
or mechanical hitch) and repair or change if
needed.
② Check harness between CN5-11 (CPU board)
and P2 terminal, and repair or change if
needed.
③ Check harness between CN4-2 (CPU board)
and P3 terminal, and repair or change if
needed.
The truck won't move.
① Check traveling contactor (MD) (for foreign
matter between contact points or mechanical
hitch) and repair or change if needed.
② Check harness between CN5-11 (CPU board)
and P2 terminal, and repair or change if
needed.
③ Check harness between CN4-2 (CPU board)
and P3 terminal, and repair or change if
needed.
The truck won't move.
① Check traveling contactor (MD) coil for
disengagement of connectors or broken coil,
and repair or change if needed.
② Check harness between contactor oil connector
and CN4-4,12 (CPU board), and repair or
change if needed.
③ Change CPU board (drive Tr defective).
The truck won't move. ① Check for a shorted harness between CN1-8,21
(CPU board) and FR switch, and repair or
change if needed.
② Repair or change F/R switch.
Remedy
- 38 -
Reset Remarks
Turn off the If any power module is
key switch. shorted, the capacitor
between P and N cannot
be charged and thus the
error code 69 is issued.
Turn off
key switch.
Turn off
key switch.
Turn off
key switch.
Turn off
key switch.
Restore to Both fwd and rev switch
normal. turn of simultaneously.