Toyota Sienna Service Manual: How to proceed with troubleshooting

Check and replace ecu

NOTICE: • The connector should not be disconnected from the ECU. Perform the inspection from the backside of the connector on the wire harness side. • When no measuring condition is s ...

Operation flow

HINT: Perform troubleshooting in accordance with the procedures below. The following is an outline of basic troubleshooting procedures. Confirm the troubleshooting procedures for the circuit you a ...

Other materials:

Perform signal check
HINT: When entering signal check mode, the tire pressure warning ECU sets all the signal check DTCs first. After completing signal check for each inspection item, the DTCs for systems that are determined to be normal by the tire pressure warning ECU will be erased. The DTCs f ...

For manual air conditioning system
ON-VEHICLE INSPECTION 1. INSPECT AIR INLET CONTROL SERVO MOTOR (a) Remove the air inlet control servo motor. (b) Connect the positive (+) lead from the battery to terminal 5 and negative (-) lead to terminal 1, then check that the lever turns to "RECIRCULATION" side smoothly. ...

Removal
1. DRAIN BRAKE FLUID NOTICE: Wash brake fluid off immediately if it adheres to any painted surface. 2. DISCONNECT BATTERY NEGATIVE TERMINAL 3. REMOVE AIR CLEANER ASSEMBLY WITH HOSE 4. REMOVE BRAKE ACTUATOR WITH BRACKET (a) Release the latch of the brake actuator connector to disconnect the c ...