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Mechanical Troubleshooting

Brand: Toyota - Model: 5FB15

Number of messages: 5

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james_m
Irl, Ireland

As a new member Iwould like thank all the technicians that take the time to help other fello tech,s out. I need help in a bad way, this truck serial no 5fb18 14115 had no sterring found controller damaged also small circuit board under battery damaged. installed new controller had circuit board repaired checked all other components ie motor contactor .chocke coil etc , switched on sterring operated ok untel it reached end stop then smoke came from circuit board under batt , I think the controller may still be ok looks ok and no burned smell local dealer has no info on this truck says it,s a japanese domestic truck Does any one know what the purpose of this circuit board which has a relay and some resistors , I think it may be a current limit / If i had the value of resistors Imight be able to repair it Does anyone have any exp on this system THANKS james m.

Posted 7 Sep 2005 06:59 AM

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maria_e
New South Wales, Australia

The board with a relay and some large resistors is a anti-kick back circuit. When the key switch is turned off, some early models gave a small kick to the steering column. Fitting of the kick back board stopped this fault occurring. Later 5FB models had the circuitry incorporated into the EPS controller.

Posted 12 Sep 2005 11:27 AM

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james_m
Irl, Ireland

Maria Thanks for that info on the circuit board for the 5fb; have you any idea what caused the resistors to burn up at full lock and any idea of the value of the resistors.Also how many large resistors should be on the board because there is a marked space for a resistor which is missing hoping for more info thanks James M.

Posted 13 Sep 2005 09:41 AM

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Bruce
Manitoba, Canada

James M

I look at your post yesterday and checked at our shop for a service manual for a 5FB, regreatably there are only manuals for 5FBC and 5FBCUs. I am sure there is not much differance between them and a 5FB. If the 5FB has a small box under the battery (right side) with a circuit board it has the EHPS (electronic power controlled steering pump motor) option. The power steering motor should only run when the steering wheel is turned (has a pressure sensor on the hydraulic steering control).

Inside the box it should look like my very rough drawing

        ____________________
       l                     ___         l
       l  l      ____     l  Ol   ___ l
       l  l     l  i    i l   l     l  l   l  l
       l  l     l    O  l   l     l  L__l  l
       l  l     l        l   l     l  l     l  l
       l  l     l    O = ==Ol   l F3l  l
       l  l     l        l   L__l  l     l  l
       l  l     l    O  l     SR   L__l  l
       l  i     l ___ l            l     l  l
       l SB    TR                L__l  l
       L_____________________

SB =circuit board
TR =Power FET/Diode block
SR =Shunt resistor (current sensor)
F3= 75 amp fuse

You said that the resistor is over heating? . It is for sensing the steer motor current and has 2 signal wires from it to the circuit board. The circuit board should limit the pulse control to the power FET when the voltage from the shunt resistor reaches a certian level (below 75 amps to the steering motor).

Posted 18 Sep 2008 12:09 AM

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edel38
Paita, Peru

Hello from Perú:
It is very dificult find the service manual to TOYOTA 5FB, please, help me about TSM 002 schematic. If know where buy service manual, heeeeelpme

-------------------------
edgardeloy@yahoo.es

Posted 26 Jun 2009 02:36 AM

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