Toyota Sienna Service Manual: How to proceed with troubleshooting
HINT:
The intelligent tester can be used in steps 2, 3, 4, 6 and 9.
1 VEHICLE BROUGHT TO WORKSHOP
2 CONNECT INTELLIGENT TESTER TO DLC3
HINT:
If the display indicates a communication fault in the tester, inspect the DLC3.
3 CHECK DTC AND FREEZE FRAME DATA
(a) Check for DTC(s) and freeze frame data (See page ES- 40).
HINT:
Record or print the DTCs and freeze frame data, if necessary.
4 CLEAR DTC AND FREEZE FRAME DATA
(a) Clear the DTC(s) and freeze frame data (See page ES- 40).
5 CONDUCT VISUAL INSPECTION
6 SET CHECK MODE DIAGNOSIS
(a) Set the check mode (See page ES-43).
7 CONFIRM PROBLEM SYMPTOMS
HINT:
If the engine does not start, perform steps 9 and 11 first.
Result 
8 SIMULATE SYMPTOMS
9 CHECK FOR DTCS
(a) Check for DTCs (See page ES-39).
Result 
10 REFER TO DTC CHART
HINT:
Refer to the DTC chart (See page ES-56).
| GO TO STEP 13 |
11 CONDUCT BASIC INSPECTION
HINT:
Refer to "BASIC INSPECTION" (See page ES-13).
Result 
12 REFER TO PROBLEM SYMPTOMS TABLE
HINT:
Refer to "PROBLEM SYMPTOMS TABLE" (See page ES- 27).
Result 
13 CHECK ECM POWER SOURCE CIRCUIT
HINT:
Refer to "ECM POWER SOURCE CIRCUIT" (See page ES- 437).
14 CONDUCT CIRCUIT INSPECTION
Result 
15 CHECK FOR INTERMITTENT PROBLEMS
HINT:
Refer to "CHECK FOR INTERMITTENT PROBLEMS" (See page ES-13).
| GO TO STEP 17 |
16 CONDUCT PARTS INSPECTION
17 IDENTIFY PROBLEM
18 ADJUST AND/OR REPAIR
19 CONDUCT CONFIRMATION TEST
END
System diagram
...
Check for intermittent problems
1. CHECK FOR INTERMITTENT PROBLEMS
HINT:
For use of the intelligent tester only:
Inspect the vehicle's ECM using check mode.
Intermittent problems are easier to detect with an
intelligent teste ...
Other materials:
Vehicle exterior
Items
Check points
Doors
Do the doors operate smoothly?
Engine hood
Does the engine hood lock system work
properly?
Fluid leaks
There should not be any signs of fluid
leakage after the vehicle ha ...
Power back door main switch
INSPECTION
1. INSPECT POWER BACK DOOR MAIN SWITCH
Inspect the resistance of the main switch.
Resistance
If the result is not as specified, replace the switch.
Apply battery voltage and check the illuminates.
OK
HINT:
Whether the switch illuminates or not will not affect
th ...
Meter Illumination is Always Dark
DESCRIPTION
Confirm that the vehicle is equipped with the optitron meter, then
check this circuit.
The combination meter assembly receives a auto dimmer signal from the
body ECU by the multiplex
communication line.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 CHECK MULTIPLEX CO ...
