Toyota Sienna Service Manual: Back-up Power Source Circuit
DESCRIPTION
This is the back-up power source for the A/C amplifier. Power is supplied even when the ignition switch is off and is used for diagnostic trouble code memory, etc.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 INSPECT FUSE (ECU-B)
(a) Remove the ECU-B fuse from the engine room junction block.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance
2 CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY)
(a) Disconnect the connector from the A/C amplifier.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
ACC Power Source Circuit
DESCRIPTION
This circuit supplies power to the A/C amplifier and the illumination for the
clock.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 INSPECT FUSE (ECU ACC)
(a) Remove the ECU ACC fuse fr ...
Other materials:
Crankshaft Position Sensor
DESCRIPTION
The Crankshaft Position (CKP) sensor system consists of a CKP sensor plate
and a pickup coil. The
sensor plate has 34 teeth and is installed on the crankshaft. The pickup coil is
made of an iron core and a
magnet.
The sensor plate rotates as each tooth passes through the pi ...
TC and CG Terminal Circuit
DESCRIPTION
Connecting terminals TC and CG of the DLC3 causes the system to enter the
self-diagnostic mode. If a
malfunction is present, DTCs will be output.
HINT:
When a particular warning light remains blinking, a ground short in the wiring
of terminal TC of the DLC3
or an internal ground ...
How to proceed with
troubleshooting
HINT:
Troubleshoot in accordance with the procedures on the
following pages.
1 VEHICLE BROUGHT TO WORKSHOP
2 DTC CHECK
Check for DTCs and make a note of the code that is
output (See page MP-14).
Delete the DTC.
Check if the DTC is output once again when the problem
symptom is simulat ...
