Toyota Sienna Service Manual: Terminals of ECU
1. CHECK INSTRUMENT PANEL J/B ASSEMBLY (MULTIPLEX NETWORK BODY ECU)
- Disconnect the B6, B7 and B9 ECU connectors.
- Disconnect the 1A, 1C, 1L and 1K J/B connectors.
- Measure the voltage and resistance between each terminal of the wire harness side connectors and body ground
If the result is not as specified, there may be a malfunction on the wire harness side.
- Reconnect the B6, B7 and B9 ECU connectors.
- Reconnect the 1A, 1C, 1L and 1K J/B connectors.
- Measure the voltage between each terminal of the connectors and the body ground.
*: with Engine Immobiliser System If the result is not as specified, the J/B assembly (body ECU) may have a malfunction.
- Engine Hood Courtesy Switch Circuit
- Security Horn Circuit
- Ignition Switch Circuit
- Security Indicator Light Circuit
- ECU Power Source Circuit
Problem symptoms table
Proceed to the reference page shown in the table below for
each malfunction symptom and troubleshoot each circuit.
HINT:
Troubleshooting of the theft deterrent system is based on the
premise tha ...
Engine Hood Courtesy Switch Circuit
DESCRIPTION
The engine hood courtesy switch is built in the engine hood lock assembly.
The switch turns on when the
engine hood is opened and turns off when the engine hood is closed.
WIRING DIAG ...
Other materials:
Vehicle Speed Sensor Malfunction
DTC P0500 Vehicle Speed Sensor Malfunction
DTC P0503 Vehicle Speed Sensor Circuit Malfunction
DESCRIPTION
The cruise control system uses the same vehicle speed signal that is sent to
the ECM for the SFI system.
If DTC P0500 is detected, perform the diagnosis using the inspection procedure
...
Inspection
1. Inspect no. 3 Intake air control valve
assembly
(A) inspect actuator operation.
(1) With 26.7 Kpa (200 mm hg, 7.9 In. Hg) of
vacuum applied to the actuator, check that the
actuator rod moves.
(2) One minute after applying the vacuum, check
that the actuator rod does not return.
...
Seat Belt Buckle Switch LH Circuit Malfunction
DTC B0126/27 Seat Belt Buckle Switch LH Circuit Malfunction
DESCRIPTION
The seat belt buckle switch LH circuit consists of the center airbag sensor
assembly and the front seat
inner belt assembly LH.
DTC B0126/27 is recorded when a malfunction is detected in the seat belt buckle
switch LH ...
