Toyota 4Runner: Side Auto Step LH Stowing Timeout (51-56)

Toyota 4Runner Service Manual / Vehicle Exterior / Exterior Panels / Trim / Automatic Running Board System / 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.	Power lift step assembly Side auto step motor assembly
52	Side auto step motor LH operates for 4 seconds or more.
53	Side auto step motor RH operates for 4 seconds or more.
54	Side auto step motor RH operates for 4 seconds or more.
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

REPLACE SIDE AUTO STEP MOTOR ASSEMBLY

GO TO STEP 3

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.

REPLACE SIDE AUTO STEP MOTOR ASSEMBLY

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.

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.

REPLACE SIDE AUTO STEP MOTOR ASSEMBLY

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 ...

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