TCM FB30-8 - Page 225

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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.