Toyota 4Runner: Speed Signal Circuit
DESCRIPTION
The vehicle speed signal consists of pulses sent to the side auto step controller ECU assembly from the main body ECU (multiplex network body ECU).
WIRING DIAGRAM
PROCEDURE
|
1. |
INSPECT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A42-11 (SP1+) - Body ground |
Vehicle speed at lower than 8 km/h (5 mph) |
11 to 14 V |
|
Vehicle speed at 8 km/h (5 mph) or more |
Below 1 V |
|
*a |
Component with harness connected (Side Auto Step Controller ECU Assembly) |
|
Result |
Proceed to |
|---|---|
|
NG |
A |
|
OK |
B |
| B | .gif) |
REPLACE SIDE AUTO STEP CONTROLLER ECU ASSEMBLY |
|
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|
2. |
CHECK HARNESS AND CONNECTOR (SIDE AUTO STEP ECU - MAIN BODY ECU) |
(a) Disconnect the A42 side auto step controller ECU assembly connector.
(b) Disconnect the F9 main body ECU (multiplex network body ECU) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A42-11 (SP1+) - F9-15 (SPD) |
Always |
Below 1 Ω |
Standard Resistance (Check for Short):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A42-11 (SP1+) - Body ground |
Always |
10 kΩ or higher |
| OK | |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Door Courtesy Switch Circuit
DESCRIPTION
The side auto step controller ECU assembly receives the door open/closed signal
from each door courtesy light switch via the side auto step switch assembly.
WIRING DIAGRAM
CAUTION / ...
Other materials about Toyota 4Runner:
Rear Occupant Classification Sensor LH Collision Detection (B1787)
DESCRIPTION
DTC B1787 is stored when the occupant classification ECU receives a collision
detection signal, which is sent by the rear occupant classification sensor LH when
an accident occurs.
DTC B1787 is also stored when the separate type front seat cu ...
Cleaning and protecting the vehicle interior
The following procedures will help protect your vehicle’s interior and
keep it in top condition:
Protecting the vehicle interior
Remove dirt and dust using a vacuum cleaner. Wipe dirty surfaces with a cloth
dampened with lukewarm water.
Cleaning the ...
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