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INTRODUCTION - HOW TO TROUBLESHOOT ECU CONTROLLED 01-27
SYSTEMS
01045-20
HOW TO PROCEED WITH TROUBLESHOOTING
HINT:
Carry out troubleshooting in accordance with the procedures on the following page. Here, only the basic
procedures are shown. Details are provided in the Diagnostics Section, showing the most effective methods
for each circuit. Confirm the troubleshooting procedures first for the relevant circuit before beginning trouble-
shooting of that circuit.
1 Vehicle brought to workshop
2 Customer problem analysis
(a) Ask the customer about the conditions and environment when the problem occurred.
3 Symptom confirmation and DTC (and freeze frame data) check
(a) Check the battery positive voltage.
Voltage: 11 to 14 V (Engine stopped)
(b) Visually check the wire harness, connectors and fuses for open and short, etc.
(c) Warm up the engine to the normal operating temperature.
(d) Confirm the problem symptoms and conditions, and check for DTCs according to the related chart.
OK Go to step 5
NG
4 DTC chart
(a) Check the results obtained in step 3, then confirm the inspection procedures for the system or the part
which should be checked using the DTC chart.
Go to step 6
5 Problem symptoms chart
(a) Check the results obtained in step 3, then confirm the inspection procedures for the system or the part
which should be checked using the problem symptoms table.
6 Circuit inspection or parts inspection
(a) Confirm the circuit for the system or the part which should be checked using the problem symptoms
table or the results obtained in step 4.
7 Repair
(a) Repair the affected system or part in accordance with the instructions in step 6.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 27
01-28 INTRODUCTION - HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
8 Confirmation test
(a) After completing repairs, confirm that the problem has been solved (If the problem does not recur, per-
form a confirmation test under the same conditions and in the same environment as when it occurred
for the first time).
END
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 28
INTRODUCTION - HOW TO TROUBLESHOOT ECU CONTROLLED 01-29
SYSTEMS
CUSTOMER PROBLEM ANALYSIS
HINT:
S In troubleshooting, the problem symptoms must be confirmed accurately, meaning that all preconcep-
tions must be set aside in order to make an accurate judgement. To ascertain what the problem symp-
toms are, it is extremely important to ask the customer about the problem and conditions when it oc-
curred.
S The following 5 items are important points in the problem analysis. Past problems which are thought
to be unrelated and the repair history, etc. may also help in some cases. Therefore, as much informa-
tion as possible should be gathered and its relationship with the problem symptoms should be correctly
ascertained for use as a reference in troubleshooting. A customer problem analysis table is provided
for your use in the Diagnostics Section for each system.
Important Points with Customer Problem Analysis
D What ----- Vehicle model, system name
D When ----- Date, time, occurrence frequency
D Where ----- Road conditions
D Under what conditions? ----- Running conditions, driving conditions, weather conditions
D How did it happen? ----- Problem symptoms
(Sample) Supplemental restraint system check sheet.
CUSTOMER PROBLEM ANALYSIS CHECK
Inspector's
Supplemental Restraint System Check Sheet Name
Registration No.
Customer's Name Registration Year / /
Frame No.
km
Date Vehicle Brought In / / Odometer Reading miles
Date Problem First Occurred / /
Weather Fine Cloudy Rainy Snowy Other
Temperature Approx.
Starting Idling
Vehicle Operation Driving [ Constant speed Acceleration Deceleration
Other ]
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 29
01-30 INTRODUCTION - HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
SYMPTOM CONFIRMATION AND DIAGNOSTIC TROUBLE CODE
HINT:
S The diagnostic system in SIENNA has various functions. The first function is the Diagnostic Trouble
Code (DTC) Check, in which a malfunction in the signal circuits to the ECU is stored in code form in
the ECU memory. Another function is the Input Signal Check, which checks if the signals from various
switches are sent to the ECU correctly. By using these check functions, it is possible to quickly narrow
down potential problem areas and troubleshooting can be performed effectively. The diagnostic func-
tions are incorporated in the following systems in the SIENNA.
Diagnostic Trouble Input Signal Check Diagnostic Test
System
Code Check (Sensor Check) Mode (Active Test)
SFI System
(with Check Mode)
Tire Pressure Warning System
ABS with EBD System
ABS with EBD & BA & TRAC & VSC System
Electronically Controlled Automatic Transmission [ECT]
(with Check Mode)
Air Conditioning System
Supplemental Restraint System
Lighting System
Audio System
Combination Meter
Power Window Control System (w/ jam protection)
Power Door Lock Control System
Power Slide Door System
Back Door Closer System
Power Back Door System
Wireless Door Lock Control System
Engine Immobiliser System
Multiplex Communication System
CAN Communication System
Cruise Control System
Dynamic Laser Cruise Control System
S In the DTC check, it is very important to determine whether the problem indicated by the DTC is still
occurring or has occurred in the past but returned to normal at present. In addition during the problem
symptom check, a check must be made on whether the malfunction indicated by the DTC is directly
related to the problem symptom or not. For this reason, the DTC should be checked before and after
symptom confirmation to determine the current conditions. If this is not done, it may, depending on the
case, result in unnecessary troubleshooting for systems that are operating normally. This would make
more difficult to detect the problem area or to try to repair irrelevant areas. Therefore, always follow
procedures in the correct order and perform the DTC check.
S A flow chart showing how to proceed with troubleshooting using the diagnostic trouble code (DTC)
check is shown on the next page. This flow chart shows how to utilize the DTC check effectively. Then,
by carefully checking the results, this chart indicates how to proceed either to the DTC troubleshooting
or to the troubleshooting of the problem symptoms table.
1 DTC check
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 30
INTRODUCTION - HOW TO TROUBLESHOOT ECU CONTROLLED 01-31
SYSTEMS
2 Make a note of the DTCs displayed and then clear the memory
3 Symptom confirmation
Symptoms exist
No symptoms exist
a Go to step 5
b
4 Simulation test using symptom simulation methods
5 DTC check
DTC displayed
Normal code displayed
a Troubleshooting of problem indicated by DTC
b
6 Symptom confirmation
No symptoms exist
Symptoms exist
If a DTC is displayed in the initial DTC check, it indicates that
a trouble may have occurred in a wire harness or connector in
that circuit in the past. Therefore, check the wire harness and
connectors (See page 01-37 ).
a System normal
b
Troubleshooting of each problem symptom
The problem is still occurring in a place other than the diagnostic circuit (The DTC displayed first is either
for a past problem or a secondary problem).
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 31
01-32 INTRODUCTION - HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
SYMPTOM SIMULATION
HINT:
The most difficult case in troubleshooting is when no symptoms occur. In such cases, a thorough customer
problem analysis must be carried out. Then the same or similar conditions and environment in which the
problem occurred in the customer's vehicle should be simulated. No matter how much experience a techni-
cian has, or how skilled he may be, if he proceeds to troubleshoot without confirming the problem symptoms,
he will tend to overlook something important in the repair operation and make a wrong guess somewhere,
which will only lead to a standstill. For example, for a problem which only occurs when the engine is cold,
or for a problem which occurs due to vibration caused by the road during driving, etc., the problem can never
be determined when the engine is hot or when the vehicle at is a standstill. Since vibration, heat or water
penetration (moisture) is a likely cause for the problem which is difficult to reproduce, the symptom simulation
tests introduced here are effective measures in a point that the external causes are applied to the vehicle
in a stationary condition.
Important points in the symptom simulation test:
In the symptom simulation test, the problem symptoms should be confirmed, and the problem area or parts
must also be discovered. To do so, reduce the possible problem circuits according to the symptoms before
starting this type of test and have the hand-held tester connected beforehand. After that, carry out the symp-
tom simulation test, judging whether the circuit being tested is defective or normal and also confirming the
problem symptoms at the same time. Refer to the problem symptoms table of each system to narrow down
the possible causes of the symptom.
Vibrate Slightly 1. VIBRATION METHOD: When vibration seems to be
the major cause.
(a) PART AND SENSOR
(1) Apply slight vibration with your finger to the part of
the sensor considered to be the problem cause and
check whether the malfunction occurs.
HINT:
Applying strong vibration to relays may result in open relays.
(b) CONNECTORS
(1) Slightly shake the connector vertically and horizon-
tally.
(c) WIRE HARNESS
Shake Slightly
(1) Slightly shake the wire harness vertically and hori-
zontally.
The connector joint and fulcrum of the vibration are
the major areas that should be checked thoroughly.
Vibrate
Slightly
D25083
2. HEAT METHOD: If the problem seems to occur when
the area in question is heated.
Malfunction (a) Heat the component that is the possible cause of the mal-
function with a hair dryer or similar object. Check if the
malfunction occurs.
NOTICE:
S Do not heat the components to more than 60 _C
(140_F) (Temperature is limited to keep the compo-
D25084 nents from being damaged).
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 32
INTRODUCTION - HOW TO TROUBLESHOOT ECU CONTROLLED 01-33
SYSTEMS
S Do not apply heat directly to the parts in the ECU.
3. WATER SPRINKLING METHOD: When the malfunc-
tion seems to occur on a rainy day or in high-humid-
ity.
(a) Sprinkle water onto the vehicle and check if the malfunc-
tion occurs.
NOTICE:
S Never sprinkle water directly onto the engine
compartment, but indirectly change the temperature
D30456 and humidity by spraying a mist of water onto the ra-
diator front surface.
S Never apply water directly onto the electronic compo-
nents.
HINT:
If a vehicle is subject to water leakage, the leaking water may
contaminate the ECU. When testing a vehicle with a water leak-
age problem, this factor must also be considered.
4. OTHERS: If the malfunction seems to occur when
ON
electrical load is excessive.
(a) Turn on all the electrical equipment including the heater
blower, headlights, rear window defogger, etc., and check
if the malfunction occurs.
B02389
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 33
01-34 INTRODUCTION - HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
DIAGNOSTIC TROUBLE CODE CHART
The inspection procedures are shown in the table below. This table allows efficient and accurate trouble-
shooting using the diagnostic trouble codes displayed in the diagnostic trouble code chart. Proceed with
troubleshooting in accordance with the inspection procedures listed in the diagnostic chart corresponding
to the diagnostic trouble codes displayed. The diagnostic trouble code chart for the Supplemental Restraint
System is shown below as an example.
D DTC No.
Indicates the diagnostic trouble code.
D Page or Instructions
D Trouble Area
Indicates the page where the inspection proce-
Indicates the suspect areas of
dures for each circuit is to be found, or gives
the problem.
instructions for checking and repairs.
D Detection Item
Indicates the system or details of the
problem.
DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the DTC check, check the circuit for that code listed in the table
below (Proceed to the page given for that circuit).
DTC No. SRS
Detection Item Trouble Area
(See page) Warning Light
D Short in D squib circuit D Steering wheel pad (squib)
B0100/13 D Spiral cable
ON
(05-119) D Airbag sensor assembly
D Wire harness
D Open in D squib circuit D Steering wheel pad (squib)
B0101/14 D Spiral cable
ON
(05-124) D Airbag sensor assembly
D Wire harness
D Short in D squib circuit (to ground) D Steering wheel pad (squib)
B0102/11 D Spiral cable
(05-128) D Airbag sensor assembly ON
D Wire harness
D Short in D squib circuit (to B+) D Steering wheel pad (squib)
B0103/12 D Spiral cable
ON
(05-132) D Airbag sensor assembly
D Wire harness
B0105/53 D Short in P squib circuit D Front passenger airbag assembly (squib)
(05-136) D Airbag sensor assembly ON
D Wire harness
B0106/54 D Open in P squib circuit D Front passenger airbag assembly (squib)
D Airbag sensor assembly ON
D Wire harness
D Short in P squib circuit (to Ground) D Front passenger airbag assembly (squib)
D Airbag sensor assembly ON
D Wire harness
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 34
INTRODUCTION - HOW TO TROUBLESHOOT ECU CONTROLLED 01-35
SYSTEMS
PROBLEM SYMPTOMS TABLE
The suspected circuits or parts for each problem symptom are shown in the table below. Use this table to
troubleshoot the problem when a Normal code is displayed in the diagnostic trouble code chart but the prob-
lem is still occurring. Numbers in the table indicate the inspection order in which the circuits or parts should
be checked.
HINT:
When the problem is not detected by the diagnostic system even though the problem symptom is present,
it may be that the problem is occurring outside the detection range of the diagnostic system.
D Page
Indicates the page where the flow chart for each circuit
is located.
D Circuit Inspection, Inspection Order
Indicates the circuit which needs to be checked for each problem
symptom. Check in the order indicated by the numbers.
D Circuit or Part Name
D Problem Symptom Indicates the circuit or part which needs to be checked.
PROBLEM SYMPTOMS TABLE
Proceed with troubleshooting of each circuit in the table below.
Symptom Suspected Area See Page
1. With the ignition switch in ACC or ON position, the SRS warning 1. SRS warning light circuit
light sometimes lights up after approx. 6 seconds have elapsed. (Always lights up when ignition switch is in 05-180
2. SRS warning light is always lit up even when ignition switch is
LOCK position.)
in the LOCK position
1. SRS warning light circuit
1. With the ignition switch in the ACC or ON position, the SRS
(Does not light up when ignition switch is turned 05-183
warning light does not light up.
to ACC or ON.)
1. DTC is not displayed.
2. SRS warning light is always lit up at the time of DTC check
1. Tc terminal circuit 05-187
procedure.
3. DTC is displayed without Tc and CG terminal connection.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 35
01-36 INTRODUCTION - HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
CIRCUIT INSPECTION
How to read and use each page is shown below.
D Circuit Description D Inspection Procedures
The major role and operation of the circuit Use the inspection procedures to determine
and its component parts are explained. if the circuit is normal or abnormal. If it is ab-
normal, use it to determine whether the prob-
D Diagnostic Trouble Code No. and Detection Item lem is located in the sensors, actuators, wire
harness or ECU.
D Indicates the diagnostic trouble codes, diagnostic
trouble code settings and suspect areas for a
problem.
SFI SFI
D Indicates the condition of the connector of the ECU
during the check.
D Wiring Diagram
This shows a wiring diagram of the circuit. Connector being checked Connector being checked
Use this diagram together with ELECTRICAL is connected. is disconnected.
WIRING DIAGRAM to thoroughly understand the Connections of tester are For inspection of connec-
circuit. indicated by (+), (-) after tor with body ground, there
Wire colors are indicated by an alphabetical code. terminals name. is nothing about the body
B = Black, L = Blue, R = Red, BR = Brown, ground written down.
LG = Light Green, V = Violet, G = Green,
O = Orange, W = White, GR = Gray, P = Pink,
Y = Yellow, SB = Sky Blue
The first letter indicates the basic wire color and
the second letter indicates the color of the stripe.
D25842
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 36
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