HOW TO PROCEED WITH TROUBLESHOOTING
1. OPERATION FLOW
HINT:
Perform troubleshooting in accordance with the procedure below. The following is an outline of basic troubleshooting procedure. Confirm the troubleshooting procedure for the circuit you are working on before beginning troubleshooting.
2. 1.VEHICLE BROUGHT TO WORKSHOP
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3. 2.CUSTOMER PROBLEM ANALYSIS
(a) Ask the customer about the conditions and environment when the problem occurred.
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4. 3.INSPECT BATTERY VOLTAGE
Standard voltage:
11 to 14 V
If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.
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5. 4.SYMPTOM CONFIRMATION AND DTC (AND FREEZE FRAME DATA) CHECK
(a) Visually check the wire harnesses, connectors and fuses for open and short circuits.
(b) Warm up the engine to the normal operating temperature.
(c) Confirm the problem symptoms and conditions, and check for DTCs.
Result |
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DTC is output |
GO TO STEP 5 |
DTC is not output |
GO TO STEP 6 |
6. 5.DTC CHART
(a) Find the output DTC in the DTC chart. Look at the Trouble Area column for a list of potentially malfunctioning circuits and/or parts.
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GO TO STEP 7 |
7. 6.PROBLEM SYMPTOMS CHART
(a) Find the problem symptoms in the problem symptoms table. Look at the Suspected Area column for a list of potentially malfunctioning circuits and/or parts.
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8. 7.CIRCUIT INSPECTION OR PARTS INSPECTION
(a) Identify the malfunctioning circuit or part.
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9. 8.ADJUST, REPAIR OR REPLACE
(a) Adjust, repair or replace the malfunctioning circuit or parts.
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10. 9.CONFIRMATION TEST
(a) After the adjustment, repairs or replacement of components, confirm that the malfunction no longer exists. If the malfunction does not recur, perform a confirmation test under the same conditions and in the same environment as when the malfunction first occurred.
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END |
11. CUSTOMER PROBLEM ANALYSIS
HINT:
What |
Vehicle model, system name |
When |
Date, time, occurrence frequency |
Where |
Road conditions |
Under what conditions? |
Driving conditions, weather conditions |
How did it happen? |
Problem symptoms |
12. SYMPTOM CONFIRMATION AND DIAGNOSTIC TROUBLE CODE
HINT:
The diagnostic system in this vehicle has various functions.
By using these functions, the problem areas can be narrowed down and troubleshooting can be more effective. Diagnostic functions are incorporated in the following systems of this vehicle.
System |
Symptom Confirmation and Diagnostic Trouble Code |
||||
---|---|---|---|---|---|
DTC Check (Normal Mode) |
DTC Check (Check Mode) |
Sensor Check/Test Mode (Input Signal Check) |
Data List |
Active Test |
|
1AR-FE SFI System |
○ |
○ |
- |
○ |
○ |
2GR-FE SFI System |
○ |
○ |
- |
○ |
○ |
Cruise Control System |
○ |
- |
- |
○ |
○ |
U660E Automatic Transaxle System |
○ |
○ |
- |
○ |
○ |
U660F Automatic Transaxle System |
○ |
○ |
- |
○ |
○ |
U760E Automatic Transaxle System |
○ |
○ |
- |
○ |
○ |
U760F Automatic Transaxle System |
○ |
○ |
- |
○ |
○ |
Active Torque Control 4WD System |
○ |
- |
- |
○ |
○ |
Tire Pressure Warning System |
○ |
- |
○ |
○ |
○ |
Vehicle Stability Control System |
○ |
- |
○ |
○ |
○ |
Power Steering System |
○ |
- |
- |
○ |
- |
Steering Lock System |
○ |
- |
- |
○ |
- |
Audio and Visual System |
○ |
- |
- |
○ |
- |
Navigation System |
○ |
- |
- |
○ |
- |
Intuitive Parking Assist System |
○ |
- |
- |
○ |
○ |
Rear Vier Monitor System |
○ |
- |
- |
- |
- |
Garage Door Opener System |
- |
- |
- |
- |
- |
LIN Communication System |
○ |
- |
- |
○ |
- |
CAN Communication System |
○ |
- |
- |
- |
- |
Power Door Lock Control System |
- |
- |
- |
○ |
○ |
Wireless Door Lock Control System (w/ Smart Key System) |
○ |
- |
- |
○ |
○ |
Wireless Door Lock Control System (w/o Smart Key System) |
○ |
- |
- |
○ |
○ |
Key Reminder Warning System |
- |
- |
- |
○ |
- |
Smart Key System (for Entry Function) |
○ |
- |
- |
○ |
○ |
Smart Key System (for Start Function) |
○ |
- |
- |
○ |
○ |
Engine Immobiliser System (w/ Smart Key System) |
○ |
- |
- |
○ |
- |
Engine Immobiliser System (w/o Smart Key System) |
○ |
- |
- |
○ |
○ |
Theft Deterrent System (w/ Smart Key System) |
- |
- |
- |
○ |
○ |
Theft Deterrent System (w/o Smart Key System) |
- |
- |
- |
○ |
○ |
Lighting System (INT) |
- |
- |
- |
○ |
○ |
Meter/Gauge System |
○ |
- |
- |
○ |
○ |
Clock System |
- |
- |
- |
- |
- |
Airbag System |
○ |
○ |
- |
○ |
- |
Occupant Classification System |
○ |
- |
- |
○ |
- |
Front Power Seat Control System (w/o Memory) |
- |
- |
- |
- |
- |
Front Power Seat Control System (w/ Memory) |
○ |
- |
- |
○ |
○ |
Seat Heater System |
- |
- |
- |
- |
- |
Seat Belt Warning System |
- |
- |
- |
○ |
○ |
Air Conditioning System |
○ |
- |
- |
○ |
○ |
Power Window Control System |
○ |
- |
- |
○ |
○ |
Windshield Deicer System |
- |
- |
- |
- |
- |
Window Defogger System |
- |
- |
- |
- |
○ |
Sliding Roof System |
○ |
- |
- |
○ |
○ |
Back Door Closer System |
○ |
- |
- |
○ |
○ |
Power Back Door System |
○ |
- |
- |
○ |
○ |
Power Mirror Control System (w/ Memory) |
- |
- |
- |
○ |
○ |
Power Mirror Control System (w/o Memory) |
- |
- |
- |
- |
- |
Wiper and Washer System |
- |
- |
- |
- |
- |
Lighting System (EXT) |
○ |
- |
- |
○ |
○ |
Horn System |
- |
- |
- |
- |
- |
13. 1.DTC CHECK
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14. 2.MAKE A NOTE OF DTC DISPLAYED AND THEN CLEAR MEMORY
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15. 3.SYMPTOM CONFIRMATION
Result |
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No symptoms exist |
GO TO STEP 4 |
Symptoms exist |
GO TO STEP 5 |
16. 4.SIMULATION TEST USING SYMPTOM SIMULATION METHODS
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17. 5.DTC CHECK
Result |
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DTC is not output |
GO TO STEP 6 |
DTC is output |
TROUBLESHOOT FOR PROBLEM INDICATED BY DTC |
18. 6.SYMPTOM CONFIRMATION
Result |
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No symptoms exist |
TROUBLESHOOT FOR EACH PROBLEM SYMPTOM |
Symptoms exist |
END |
If a DTC was displayed in the initial DTC check, the problem may have occurred in a wire harness or connector in that circuit in the past. Check the wire harness and connectors.
19. TROUBLESHOOT FOR EACH PROBLEM SYMPTOM
The problem still occurs in a place other than the diagnostic circuit (the DTC displayed first is either for a past problem or a secondary problem).
20. SYMPTOM SIMULATION
HINT:
The most difficult case in troubleshooting is when no problem symptoms occur. In such a case, a thorough problem analysis must be carried out. A simulation of the same or similar conditions and environment in which the problem occurred in the customer's vehicle should be carried out. No matter how much skill or experience a technician has, troubleshooting without confirming the problem symptoms will lead to important repairs being overlooked and mistakes or delays.
For example:
With a problem that only occurs when the engine is cold or as a result of vibration caused by the road during driving, the problem can never be determined if the symptoms are being checked on a stationary vehicle or a vehicle with a warmed-up engine. Vibration, heat or water penetration (moisture) is difficult to reproduce. The following symptom simulation tests are effective substitutes for the conditions and can be applied to a stationary vehicle. Important points in the symptom simulation test:
In the symptom simulation test, the problem symptoms as well as the problem area or parts must be confirmed. First, narrow down the possible problem circuits according to the symptoms. Then, connect the tester and carry out the symptom simulation test, judging whether the circuit being tested is defective or normal. Also, confirm the problem symptoms at the same time. Refer to Problem Symptoms Table for each system to narrow down the possible causes.
To reproduce DTCs, it is necessary to satisfy the respective DTC detection conditions.
(a) VIBRATION METHOD: When a malfunction seems to occur as a result of vibration.
(1) PART AND SENSOR
Apply slight vibration with a finger to the part of the sensor suspected to be the cause of the problem, and check whether the malfunction occurs.
NOTICE:
Applying strong vibration to relays may open the relays.
(2) CONNECTORS
Slightly shake the connector vertically and horizontally.
(3) WIRE HARNESS
Slightly shake the wire harness vertically and horizontally.
HINT:
The connector joint and fulcrum of the vibration are the major areas that should be checked thoroughly.
(b) HEAT METHOD: When a malfunction seems to occur when the area in question is heated.
(1) Heat the component that is the possible cause of the malfunction with a hair dryer or similar device. Check if the malfunction occurs.
NOTICE:
(c) WATER SPRINKLING METHOD: When a malfunction seems to occur on a rainy day or in high-humidity.
(1) Sprinkle water onto the vehicle and check if the malfunction occurs.
NOTICE:
HINT:
If the vehicle has or had a water leak problem, the leak may have damaged the ECU or connections. Look for evidence of corrosion or short circuits. Proceed with caution during water tests.
(d) HIGH ELECTRICAL LOAD METHOD: When a malfunction seems to occur when the electrical load is high.
(1) Turn on the heater blower, headlights, rear window defogger and all other electrical loads. Check if the malfunction recurs.
21. DIAGNOSTIC TROUBLE CODE CHART
Look for output Diagnostic Trouble Codes (DTCs) (from the DTC checks) in the appropriate section's Diagnostic Trouble Code Chart. Use the chart to determine the trouble area and the proper inspection procedure. A description of each of the chart's columns is shown in the table below.
Item |
Description |
---|---|
DTC No. |
Indicates the diagnostic trouble code. |
Detection Item |
Indicates the system or details of the problem. |
Trouble Area |
Indicates the suspected areas of the problem. |
See page |
Indicates the page where the inspection procedure for each circuit is to be found, or gives instruction for checking and repairs. |
22. PROBLEM SYMPTOMS TABLE
When no DTC is output but the problem still occurs, use the Problem Symptoms Table. The suspected areas (circuits or parts) for each problem symptom are shown in the table. The suspected areas are listed in order of probability. A description of each of the table columns is shown in the following table.
HINT:
In some cases, the problem is not detected by the diagnostic system even though a problem symptom occurs. It is possible that the problem occurs outside the detection range of the diagnostic system, or that the problem occurs in a completely different system.
Item |
Description |
---|---|
Symptom |
- |
Suspected Area |
Indicates the circuit or part which needs to be checked. |
See page |
Indicates the page where the inspection procedure is located. |
23. INSPECTION
A description of the main points for inspection of suspected areas is shown in the following table.
Item |
Description |
---|---|
Description |
The major role and operation of the circuit or system and its component parts are explained. |
DTC No., DTC Detection Condition and Trouble Area |
Indicates the diagnostic trouble codes, DTC detection conditions and suspected areas for a problem. |
Wiring Diagram |
This is a wiring diagram for the circuit or system. This diagram can be used together with the Electrical Wiring Diagram to thoroughly understand the circuit. Wire colors are indicated by alphabetical codes. B = Black, L = Blue, R = Red, BR = Brown, 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. |
Inspection Procedure |
This shows the procedure not only to determine whether the circuit is normal or abnormal, but also to determine whether the problem is located in the sensors, actuators, wire harness or ECU. |
Illustration of the ECU connector during the check |
The illustration shows whether the connector being checked is connected or disconnected. The connections for an electrical tester are indicated by (+) or (-) after the terminal name. For inspections between a connector and body ground, information about the ground is not shown in the illustration. |
Switch Failure (B2342)
DESCRIPTION
This DTC is output when the sliding roof ECU (sliding roof drive gear sub-assembly)
detects that the sliding roof switch is stuck for 30 seconds or more.
DTC Code
DTC Detection Condition
Trouble Area
...
Power Source Circuit
DESCRIPTION
1. w/o Multi-information Display
(a) This circuit is the power source circuit for the accessory meter assembly.
This circuit provides two types of power sources; one is a constant power source
mainly used as a backup power source, and the oth ...
Multi-information display (TFT type)
The multi-information display presents the driver with a variety of driving-related
data, including the clock and current outside temperature.
• Clock
Indicates and sets the time.
• Outside temperature
Indicates the outside temperature.
The temper ...