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:
Removal
1. Remove windshield wiper motor assembly
hint:
(see page ww-4)
2. Remove front outer cowl top panel subassembly
(see page em-27)
3. Drain engine coolant (see page co-6)
4. Remove v-bank cover sub-assembly (see
page em-28)
5. Remove no. 2 Air cleaner inlet (see page em-
28)
6. Remove no. 1 ...
Smart key system
The following operations can be performed simply by carrying
the electronic key on your person, for example in your pocket.
The driver should always carry the electronic key.
Locks and unlocks the doors
Front door handles
Sliding door handles
Back door
Starts and stops the ...
Installation
1. INSTALL VVT SENSOR (for Bank 2 Exhaust Side)
Install the VVT sensor with the bolt.
Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf)
Connect the VVT sensor connector.
2. INSTALL VVT SENSOR (for Bank 2 Intake Side)
Install the VVT sensor with the bolt.
Torque: 10 N* ...
