Toyota 4Runner manuals

Toyota 4Runner: Short to GND in Motor LH Circuit (21,23)

DESCRIPTION

When there is a short to GND in the side auto step motor circuit, the side auto step controller ECU assembly does not operate the automatic running board.

DTC No.

Detection Condition

Trouble Area

21

Short to GND in the circuit on the stowing or deploying side of the side auto step motor LH.

  • Side auto step motor assembly
  • Side auto step controller ECU assembly
  • Wire harness or connector

23

Short to GND in the circuit on the stowing or deploying side of the side auto step motor RH.

WIRING DIAGRAM


PROCEDURE

1.

INSPECT SIDE AUTO STEP MOTOR ASSEMBLY

(a) Disconnect the O25*1 or N23*2 side auto step motor assembly connector.

  • *1: for LH
  • *2: for RH

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

for LH

Tester Connection

Condition

Specified Condition

O25-4 (STW1) - Body ground

Always

10 kΩ or higher

O25-4 (STW1) - O25-1 (-1)

Always

10 kΩ or higher

O25-5 (DPL1) - Body ground

Always

10 kΩ or higher

O25-5 (DPL1) - O25-1 (-1)

Always

10 kΩ or higher

for RH

Tester Connection

Condition

Specified Condition

N23-4 (STW2) - Body ground

Always

10 kΩ or higher

N23-4 (STW2) - N23-1 (-2)

Always

10 kΩ or higher

N23-5 (DPL2) - Body ground

Always

10 kΩ or higher

N23-5 (DPL2) - N23-1 (-2)

Always

10 kΩ or higher

Text in Illustration

*a

Component without harness connected

(Side Auto Step Motor Assembly)

*A

for LH

*B

for RH



NG

REPLACE SIDE AUTO STEP MOTOR ASSEMBLY


OK

2.

CHECK HARNESS AND CONNECTOR (SIDE AUTO STEP MOTOR - SIDE AUTO STEP CONTROLLER ECU)

(a) Disconnect the A42 side auto step controller ECU assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

for LH

Tester Connection

Condition

Specified Condition

A42-3 (STW1) - Body ground

Always

10 kΩ or higher

A42-4 (DPL1) - Body ground

Always

10 kΩ or higher

for RH

Tester Connection

Condition

Specified Condition

A42-2 (STW2) - Body ground

Always

10 kΩ or higher

A42-1 (DPL1) - Body ground

Always

10 kΩ or higher


OK

REPLACE SIDE AUTO STEP CONTROLLER ECU ASSEMBLY


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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