Toyota Sienna Service Manual: Engine Control System Malfunction
DTC C1201/51 Engine Control System Malfunction
DESCRIPTION
If trouble occurs the engine control system, the ECM transmits the abnormality to the skid control ECU.
The skid control ECU set this DTC and the skid control ECU prohibits TRAC and
VSC control. 
INSPECTION PROCEDURE
1 CHECK ENGINE CONTROL SYSTEM
(a) Check if the normal system code is recorded for engine control system.
Result 
REPLACE ECM
Open or Short Circuit in ABS Solenoid Relay Circuit
DESCRIPTION
The ABS solenoid relay is built in the brake actuator assembly. This relay
supplies power to each ABS
solenoid. If the initial check is OK, after the ignition switch is turned to t ...
ECM Communication Circuit Malfunction
DTC C1203/53 ECM Communication Circuit Malfunction
DESCRIPTION
The circuit is used to send TRAC and VSC control information from the skid
control ECU to the ECM, and
engine control information fr ...
Other materials:
Gauges and meters
The displayed content may differ depending on the type of meter.
Vehicles with monochrome display
Vehicles with color display
Tachometer
Displays the engine speed in revolutions per minute
Multi-information display
Presents the driver with a variety of driving-related d ...
Installation
1. INSTALL FRONT SEAT ASSEMBLY LH
Place the seat assembly in the cabin.
NOTICE:
Be careful not to damage the body.
Connect the connectors under the seat assembly.
Tighten the 2 bolts on the front side of the seat
assembly.
Torque: 37 N*m (375 kgf*cm, 27 ft.*lb ...
Check mode procedure
1. CHECK MODE (SIGNAL CHECK): DTC CHECK
Connect the intelligent tester to the DLC3.
) Turn the ignition switch to the ON position.
) Select the "SIGNAL CHECK", and proceed
checking using the intelligent tester.
NOTICE:
Select the "SIGNAL CHECK" from the &q ...
