Toyota Sienna Service Manual: How to proceed with troubleshooting
HINT:
- Use the following procedures to troubleshoot the cruise control system.
- *: Use the intelligent tester.
1 VEHICLE BROUGHT TO WORKSHOP
2 PROBLEM SYMPTOM CONFIRMATION
3 CHECK MULTIPLEX COMMUNICATION SYSTEM*
Refer to HOW TO PROCEED WITH TROUBLESHOOTING.
- Check for output DTCs.
Result
HINT: The ECM of this system is connected to the multiplex communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the multiplex communication system.
4 CHECK CAN COMMUNICATION SYSTEM*
Refer to PRECAUTION.
- Check for output DTCs.
Result
HINT: The ECM of this system is connected to the CAN communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the CAN communication system.
5 DTC CHECK AND CLEAR*
Refer to DTC CHECK / CLEAR
6 DTC CHECK (OTHER THAN MPX AND CAN SYSTEM DTC)*
Result
7 DTC CHART
Refer to DIAGNOSTIC TROUBLE CODE CHART
8 PROBLEM SYMPTOM CONFIRMATION
Result
9 SYMPTOM SIMULATION
Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE
10 PROBLEM SYMPTOMS TABLE
Refer to PROBLEM SYMPTOMS TABLE
11 CIRCUIT INSPECTION
12 TERMINALS OF ECM
Refer to TERMINALS OF ECM
13 IDENTIFICATION OF PROBLEM
14 REPAIR OR REPLACE
15 CONFIRMATION TEST
END
System description
1. CRUISE CONTROL SYSTEM
This system is controlled by the ECM, and is activated by
the throttle position sensor and motor. The ECM controls
the following functions: ON-OFF, - (COAST)/SET, +
(ACCEL ...
Road test
1. PROBLEM SYMPTOM CONFIRMATION
Inspect the SET function.
Turn the cruise control main switch on.
Drive at the required speed between 40 km/h
(25 mph) and 200 km/h ...
Other materials:
Diagnosis system
1. DIAGNOSIS FUNCTION
The diagnosis function makes the light and the
multi-information display come on, and the CRUISE
main indicator light blink as shown in the illustration.
When a malfunction occurs in the dynamic laser
cruise control system, the DTCs are stored in the
ECM ...
System description
1. DESCRIPTION OF OCCUPANT CLASSIFICATION SYSTEM
GENERAL DESCRIPTION.
In the occupant classification system, the
occupant classification ECU calculates the
weight of the occupant based on a signal from
the occupant classification sensors. This system
recognizes the occu ...
Basic inspection
When a malfunction is not confirmed by the DTC check,
troubleshooting should be carried out in all circuits
considered to be possible causes of the problem. In many
cases, by carrying out the basic engine check shown in the
following flowchart, the location of the problem can be found
quickly a ...
