Toyota 4Runner: Side Auto Step LH Stowing Timeout (51-56)
DESCRIPTION
When fully deploying or stowing the automatic running board takes more than 4 seconds, or when the side auto step motor hall sensor pulse signal exceeds the maximum pulse count, the side auto step ECU halts the operation of the automatic running board.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
51 |
Side auto step motor LH operates for 4 seconds or more. |
|
|
52 |
||
|
53 |
Side auto step motor RH operates for 4 seconds or more. |
|
|
54 |
||
|
55 |
The side auto step motor LH hall sensor pulse count is more than the maximum number of pulses per full travel. |
|
|
56 |
The side auto step motor RH hall sensor pulse count is more than the maximum number of pulses per full travel. |
PROCEDURE
|
1. |
CHECK AUTOMATIC RUNNING BOARD OPERATION |
(a) Confirm the operation of the automatic running board and proceed to the steps indicated below.
|
Result |
Proceed to |
|---|---|
|
The side auto step motor turns over at high speed for 4 seconds and then stops. (The automatic running board does note move) |
A |
|
The side auto step motor turns over at high speed for 4 seconds and then stops. (The automatic running board is stowed or deployed) |
B |
|
The side auto step motor turns over at low speed for 4 seconds and then stops. (The automatic running board stops partway during stowing or deploying operation) |
C |
| B | .gif) |
REPLACE SIDE AUTO STEP MOTOR ASSEMBLY |
| C | |
GO TO STEP 3 |
|
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|
2. |
INSPECT POWER LIFT STEP ASSEMBLY |
(a) Check that the links of the power lift step assembly are properly installed.
(b) Check that the links of the power lift step assembly are not damaged.
OK:
Links of the power lift step assembly are properly installed.
Links of the power lift step assembly are not damaged.
| OK | |
REPLACE SIDE AUTO STEP MOTOR ASSEMBLY |
| NG | |
REPLACE POWER LIFT STEP ASSEMBLY |
|
3. |
INSPECT POWER LIFT STEP ASSEMBLY |
(a) Check that the links of the power lift step assembly are properly installed.
(b) Check that the links of the power lift step assembly are not damaged.
(c) Check that there is no dirt or foreign matter jamming the power lift step assembly links.
HINT:
- In cold times, snow or ice may jam the power lift step assembly links and prevent them from moving smoothly.
- Clean any dirt and foreign matter jamming the moving link sections of the power lift step assembly if necessary.
OK:
Links of the power lift step assembly are properly installed.
Links of the power lift step assembly are not damaged.
There is no dirt or foreign matter jamming the moving sections of the power lift step assembly links.
| OK | |
REPLACE SIDE AUTO STEP MOTOR ASSEMBLY |
| NG | |
REPLACE POWER LIFT STEP ASSEMBLY |
Hall Effect Sensor LH (43,44)
DESCRIPTION
When the automatic running board is operating and the current in the side auto
step motor is within standard parameters, the side auto step controller ECU assembly
halts the operation ...
Hall Effect Sensor LH Pulse (41,42)
DESCRIPTION
When there is noise present in the side auto step motor hall pulse signal, the
side auto step controller ECU assembly halts the operation of the automatic running
board.
D ...
Other materials about Toyota 4Runner:
Terminals Of Ecu
TERMINALS OF ECU
1. AIRBAG SENSOR ASSEMBLY
Terminal No.
Symbol
Destination
F33-1
P2+
Instrument panel passenger airbag assembly (Front passenger side squib
2nd step)
...
Headlight Dimmer Switch Circuit
DESCRIPTION
The main body ECU receives the following signals:
Headlight dimmer switch tail, head, AUTO*, high or high flash signal
Front fog light switch signal
*: w/ Automatic Light Control System
WIRING DIAGRAM
PROCEDU ...
0.0058