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:

Chassis
GENERAL MAINTENANCE 1. INSPECT STEERING LINKAGE (a) Check the steering linkage for looseness or damage. Check that: Tie rod ends do not have excessive play. Dust seals and boots are not damaged. Boot clamps are not loose. (b) Inspect the dust cover for damage. 2. INSPECT STEERING G ...

Key Lock-in Prevention Function does not Work Properly (Manual Operation and Operation Interlocked with Key are Active)
DESCRIPTION The un-lock warning switch turns ON when the key is inserted in the ignition key cylinder. The courtesy light switch turns ON when the driver side door is opened. These 2 switches are monitored by the body ECU. In order to prevent the key from being locked in, the body ECU cont ...

Engine
GENERAL MAINTENANCE HINT: Inspect these items when the engine is cold. 1. INSPECT DRIVE BELT HINT: (See page EM-6) 2. REPLACE SPARK PLUGS HINT: (See page IG-8) 3. INSPECT AIR FILTER (a) Remove the air filter. (b) Visually check that the air filter is not excessively damaged or oily ...