TCM FB-8 Series, Service Manual

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3. TROUBLESHOOTING GUIDE
3. EPS Power steering system
(1) 506
05
: EPS transistor short-circuited (at startup)
Resets when the key switch is turned OFF.
506
06
: EPS transistor short-circuited (after startup)
Resets when the key switch is turned OFF.
506
07
: EPS transistor short-circuited (lower)
Resets when the key switch is turned OFF.
506
08
: EPS transistor short-circuited (upper)
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 EPS connector.
–
③
Check for any electrical leaks between the frame-
side wires, 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 for looseness.
Retighten.
⑤
Check the EPS motor controller’s positive (+) and
negative (-) terminals and motor wiring.
Correct the wiring.
⑥
Check the
CN1E-34
terminal on the EPS motor
controller for proper connection.
Connect properly.
⑦
Check the harness for the CN1E-34 terminal on the
EPS motor controller.
Correct the wiring.
⑧
Replace the EPS motor controller.
(2) 507
04
: EPS transistor open
Resets when the key switch is turned OFF.
①
Check the EPS motor connector for looseness.
Connect securely.
②
Check the EPS motor wiring. Repair the harness.
③
Replace the EPS motor controller.
(3)
508
17
: Continuous energizing protection 1
Automatically resets when the input returns to
normal.
508
19
: Continuous energizing protection 2
Automatically resets when the input returns to
normal.
①
Put the steering wheel in neutral.
②
Replace the EPS motor controller.