Toyota Sienna Service Manual: Electronic circuit inspection procedure

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 ...

Basic inspection

(a) WHEN MEASURING RESISTANCE OF ELECTRONIC PARTS (1) Unless otherwise stated, all resistance measurements should be made at an ambient temperature of 20°C (68°F). Resistance measurements may b ...

Other materials:

Road test
1. PROBLEM SYMPTOM CONFIRMATION HINT: The dynamic laser cruise control system has two cruise control modes: the constant speed control mode and vehicle-to-vehicle distance control mode.  The vehicle-to-vehicle distance control mode is always selected when starting up the dynamic laser ...

Shift lock system
On-vehicle inspection 1. CHECK SHIFT LOCK OPERATION (a) Move the shift lever to the P position. (b) Turn the ignition switch to the LOCK position. (c) Check that the shift lever cannot be moved to any position other than P. (d) Turn the ignition switch to the on position, depress the br ...

Open or Short Circuit in ABS Motor Relay Circuit
DESCRIPTION The ABS motor relay supplies power to the ABS pump motor. While the ABS & TRAC & VSC are activated, the ECU switches the ABS motor relay ON and operates the ABS pump motor. WIRING DIAGRAM INSPECTION PROCEDURE 1 PERFORM ACTIVE TEST USING INTELLIGENT TESTER (AB ...