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:
Park / Neutral Position Switch Circuit
DESCRIPTION
The fold seat control ECU receives signals from the Park/Neutral position
switch and controls the seat
stowing and return operations. If the shift lever is in any position other than
P the seat cannot be operated.
If the ignition switch is in ACC or IG the seat cannot be operate ...
Coolant
Replacement
1. REMOVE NO. 1 ENGINE UNDER COVER (See page
EM-26)
2. REMOVE V-BANK COVER SUB-ASSEMBLY (See
page EM-28)
3. DRAIN ENGINE COOLANT
(a) Loosen the radiator drain cock plug.
HINT:
Collect the coolant in a container and dispose of it
according to the regulations in your area.
(b ...
ECM Communication Circuit Malfunction
DTC C1203/53 ECM Communication Circuit Malfunction
DESCRIPTION
The circuit is used to send TRAC and VSC control information from the skid
control ECU to the ECM, and
engine control information from the ECM to the skid control ECU through the CAN
communication
system.
INSPECTION PROCEDURE
1 ...
