Toyota Sienna Service Manual: How to troubleshoot ecu controlled systems

Vehicle lift and support locations

1. NOTICE ABOUT VEHICLE CONDITION WHEN JACKING UP VEHICLE (a) The vehicle must be unloaded before jacking up/ lifting up the vehicle. Never jack up/lift up a heavily loaded vehicle. (b) When re ...

General information

A large number of ECU controlled systems are used in the SIENNA. In general, ECU controlled systems are considered to be very intricate, requiring a high level of technical knowledge to troubleshoo ...

Other materials:

Installation
1. INSTALL BRAKE PEDAL SUPPORT ASSEMBLY (a) Install the brake pedal support sub-assembly with the 4 nuts. Torque: 16 N*m (160 kgf*cm, 12 ft.*lbf) (b) Install the clip and clevis pin to the brake pedal lever. (c) Using needle-nose pliers, install the tension spring. (d) Install the ...

Throttle / Pedal Position Sensor / Switch "A" Circuit Range / Performance Problem
HINT: This DTC relates to the Throttle Position (TP) sensor. DESCRIPTION Refer to DTC P0120 (See page ES-145). MONITOR DESCRIPTION The ECM uses the TP sensor to monitor the throttle valve opening angle. This sensor transmits two signals: VTA1 and VTA2. VTA1 is used to detect the th ...

Installation
1. INSTALL PROPELLER W/CENTER BEARING SHAFT ASSEMBLY (a) Align the matchmarks on the propeller shaft assembly rear flange and differential companion flange, and connect the shaft with the 4 bolts, washers and nuts. (b) Remove SST(s) from the extension housing. (c) Insert the yoke int ...