OPERATION FLOW
Tech Tips
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.
1.VEHICLE BROUGHT TO WORKSHOP
2.CUSTOMER PROBLEM ANALYSIS
Ask the customer about the conditions and environment when the problem occurred.
3.INSPECT BATTERY VOLTAGE
Measure the battery voltage.
If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.
4.SYMPTOM CONFIRMATION AND DTC (AND FREEZE FRAME DATA) CHECK
Visually check the wire harnesses, connectors and fuses for open and short circuits.
Warm up the engine to the normal operating temperature.
Confirm the problem symptoms and conditions, and check for DTCs.
5.DTC CHART
Find the output DTC in the DTC chart. Look at the Trouble Area column for a list of potentially malfunctioning circuits and/or parts.
6.PROBLEM SYMPTOMS CHART
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.
7.CIRCUIT INSPECTION OR PARTS INSPECTION
Identify the malfunctioning circuit or part.
8.ADJUST, REPAIR OR REPLACE
Adjust, repair or replace the malfunctioning circuit or parts.
9.CONFIRMATION TEST
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.
END
CUSTOMER PROBLEM ANALYSIS
Tech Tips
When troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.
The following 5 items are important points for problem analysis:
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 |
SYMPTOM CONFIRMATION AND DIAGNOSTIC TROUBLE CODE
Tech Tips
The diagnostic system in this vehicle has various functions.
The first function is the Diagnostic Trouble Code (DTC) check. A DTC is a code stored in the ECU memory whenever a malfunction in the signal circuits to the ECU occurs. In a DTC check, DTCs stored by a previous malfunction can be checked by a technician during troubleshooting.
Another function is the Input Signal Check, which checks if the signals from various switches are sent to the ECU correctly.
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) |
Freeze Frame Data | Sensor Check/Test Mode (Input Signal Check) | Data List | Active Test | Customize Parameter | |
SFI System (8AR-FTS, w/ Canister Pump Module) | ○ | ○ | ○ | - | ○ | ○ | - |
SFI System (8AR-FTS, w/o Canister Pump Module) | ○ | ○ | ○ | - | ○ | ○ | - |
Ignition System (8AR-FTS) | - | - | - | - | - | - | - |
SFI System (3ZR-FAE) | ○ | ○ | ○ | - | ○ | ○ | - |
Ignition System (3ZR-FAE) | - | - | - | - | - | - | - |
Fuel System (8AR-FTS) | - | - | - | - | - | - | - |
Fuel System (3ZR-FAE) | - | - | - | - | - | - | - |
Emission Control System (8AR-FTS, w/ Canister Pump Module) | - | - | - | - | - | - | - |
Emission Control System (8AR-FTS, w/o Canister Pump Module) | - | - | - | - | - | - | - |
Emission Control System (3ZR-FAE) | - | - | - | - | - | - | - |
Intake System (8AR-FTS) | - | - | - | - | - | - | - |
Intake System (3ZR-FAE) | - | - | - | - | - | - | - |
Cooling Fan System (8AR-FTS) | - | - | - | - | - | - | - |
Cooling Fan System (3ZR-FAE) | - | - | - | - | - | - | - |
Starting System (8AR-FTS) | - | - | - | - | - | - | - |
Starting System (3ZR-FAE) | - | - | - | - | - | - | - |
Cruise Control System (8AR-FTS) | ○ | - | ○ | - | ○ | ○ | - |
Cruise Control System (3ZR-FAE) | ○ | - | ○ | - | ○ | ○ | - |
Dynamic Radar Cruise Control System | ○ | - | ○ | - | ○ | ○ | - |
Lane Departure Alert System | ○ | - | ○ | - | ○ | ○ | - |
Lane Departure Alert System (w/ Steering Control) | ○ | - | ○ | - | ○ | ○ | ○ |
Stop and Start System | ○ | ○ | ○ | - | ○ | ○ | - |
Automatic Transaxle System (U661E) | ○ | ○ | ○ | - | ○ | ○ | - |
Automatic Transaxle System (U661F) | ○ | ○ | ○ | - | ○ | ○ | - |
Continuously Variable Transaxle System (K114) | ○ | ○ | ○ | - | ○ | ○ | - |
Continuously Variable Transaxle System (K114F) | ○ | ○ | ○ | - | ○ | ○ | - |
Dynamic Torque Control AWD System | ○ | - | ○ | - | ○ | ○ | - |
Adaptive Variable Suspension System | ○ | - | ○ | ○ | ○ | ○ | - |
Tire Pressure Warning System | ○ | - | - | ○ | ○ | ○ | - |
Vehicle Stability Control System | ○ | - | ○ | ○ | ○ | ○ | - |
Electric Parking Brake System | ○ | - | ○ | ○ | ○ | ○ | - |
Power Steering System (for Manual Tilt and Manual Telescopic Steering Column) | ○ | - | ○ | - | ○ | - | - |
Power Steering System (for Power Tilt and Power Telescopic Steering Column) | ○ | - | ○ | - | ○ | - | - |
Power Tilt and Power Telescopic Steering Column System | ○ | - | ○ | - | ○ | ○ | ○ |
Steering Lock System | ○ | - | - | - | ○ | ○ | - |
Heated Steering Wheel System | - | - | - | - | - | - | - |
Audio and Visual System (for 8 Speakers) | ○ | - | ○ | - | ○ | - | - |
Audio and Visual System (except 8 Speakers) | ○ | - | ○ | - | ○ | - | ○ |
ASC System | ○ | - | - | - | ○ | ○ | - |
Navigation System | ○ | - | ○ | - | ○ | - | ○ |
Telematics System (w/ Telematics Transceiver) | ○ | - | - | - | - | - | - |
Telematics System (w/o Telematics Transceiver) | - | - | - | - | - | - | - |
LEXUS Parking Assist-sensor System | ○ | - | - | - | ○ | ○ | ○ |
Parking Assist Monitor System | ○ | - | - | - | - | - | - |
Rear View Monitor System | ○ | - | - | - | - | - | - |
Blind Spot Monitor System | ○ | - | ○ | - | ○ | - | - |
Panoramic View Monitor System | ○ | - | - | - | ○ | - | - |
Charging System (8AR-FTS) | ○ | - | ○ | - | ○ | ○ | - |
Charging System (3ZR-FAE) | ○ | - | ○ | - | ○ | ○ | - |
LIN Communication System | ○ | - | - | - | ○ | - | - |
CAN Communication System (for LHD) | ○ | - | - | - | - | - | - |
CAN Communication System (for RHD) | ○ | - | - | - | - | - | - |
Power Door Lock Control System | ○ | - | - | - | ○ | ○ | ○ |
Wireless Door Lock Control System | ○ | - | - | - | ○ | ○ | ○ |
Entry and Start System (for Entry Function) | ○ | - | - | - | ○ | ○ | ○ |
Entry and Start System (for Start Function) | ○ | - | - | - | ○ | ○ | ○ |
Push-button Start | ○ | - | - | - | ○ | ○ | ○ |
Immobiliser System | ○ | - | - | - | ○ | ○ | - |
Theft Deterrent System | ○ | - | - | - | ○ | ○ | ○ |
Blocking System | ○ | - | - | - | - | - | - |
Lighting System (INT) | - | - | - | - | ○ | ○ | ○ |
Meter / Gauge System | ○ | - | ○ | - | ○ | ○ | ○ |
Clock System | - | - | - | - | - | - | - |
Airbag System | ○ | ○ | - | - | ○ | - | - |
Occupant Classification System | ○ | - | - | - | ○ | - | - |
Pre-crash Safety System | ○ | - | ○ | - | ○ | ○ | - |
Front Power Seat Control System (w/ Memory) | ○ | - | - | - | ○ | ○ | ○ |
Front Power Seat Control System (w/o Memory) | - | - | - | - | - | - | - |
Rear Power Seat Control System | - | - | - | - | - | - | - |
Seat Heater System | ○ | - | - | - | ○ | - | - |
Climate Control Seat System | - | - | - | - | - | - | - |
Seat Belt Tension Reducer System | - | - | - | - | - | - | - |
Seat Belt Warning System (w/ Occupant Classification System) | - | - | - | - | ○ | ○ | ○ |
Seat Belt Warning System (w/o Occupant Classification System) | - | - | - | - | ○ | ○ | ○ |
Air Conditioning System | ○ | - | - | - | ○ | ○ | ○ |
Accessory Socket System | - | - | - | - | - | - | - |
Wireless Charging System | - | - | - | - | - | - | - |
Roof Sunshade System | ○ | - | - | - | ○ | ○ | ○ |
Power Window Control System | ○ | - | - | - | ○ | ○ | ○ |
Windshield Deicer System | - | - | - | - | - | ○ | - |
Window Defogger System | - | - | - | - | - | ○ | - |
Sliding Roof System | ○ | - | - | - | ○ | ○ | ○ |
Back Door Closer System | ○ | - | - | - | ○ | - | - |
Power Back Door System | ○ | - | ○ | - | ○ | ○ | ○ |
Fuel Lid Opener System | - | - | - | - | - | - | - |
Power Mirror Control System (w/ Memory) | - | - | - | - | ○ | ○ | ○ |
Power Mirror Control System (w/o Memory) | - | - | - | - | ○ | ○ | ○ |
Wiper and Washer System | - | - | - | - | ○ | - | - |
Lighting System (EXT) | ○ | - | ○ | - | ○ | ○ | ○ |
Automatic Headlight Beam Level Control System | ○ | - | ○ | - | ○ | ○ | - |
Automatic High Beam System | ○ | - | - | - | ○ | - | - |
Horn System | - | - | - | - | - | - | - |
In the DTC check, it is very important to determine whether the problem indicated by the DTC either: 1) still occurs, or 2) occurred in the past but has returned to normal. In addition, the DTC should be compared to the problem symptom to see if they are related. For this reason, DTCs should be checked before and after confirmation of symptoms (i.e., whether or not problem symptoms exist) to determine current system conditions, as shown in the flowchart below.
Never skip the DTC check. Failing to check for DTCs, depending on the case, may result in unnecessary troubleshooting for systems operating normally or lead to repairs not related to the problem. Follow the procedure listed in the flowchart in the correct order.
The following flowchart shows how to proceed with troubleshooting using the DTC check. Directions from the flowchart will indicate how to proceed either to DTC troubleshooting or to the troubleshooting of each problem symptom.
1.DTC CHECK
2.MAKE A NOTE OF DTC DISPLAYED AND THEN CLEAR DTCs
3.SYMPTOM CONFIRMATION
4.SIMULATION TEST USING SYMPTOM SIMULATION METHODS
5.DTC CHECK
6.SYMPTOM CONFIRMATION
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.
SYMPTOM SIMULATION
Tech Tips
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.
*a | Vibrate Slightly |
*b | Shake Slightly |
VIBRATION METHOD: When a malfunction seems to occur as a result of vibration.
PARTS OR SENSORS
Apply slight vibration with a finger to the part or sensor suspected to be the cause of the problem, and check whether the malfunction occurs.
Note
Applying strong vibration to relays may open the relays.
CONNECTORS
Slightly shake the connector vertically and horizontally.
WIRE HARNESS
Slightly shake the wire harness vertically and horizontally.
Tech Tips
The connector joint and fulcrum of the vibration are the major areas that should be checked thoroughly.
HEAT METHOD: When a malfunction seems to occur when the area in question is heated.
Heat the component that is the possible cause of the malfunction with a hair dryer or similar device. Check if the malfunction occurs.
Note
Do not heat components to more than 60°C (140°F). Exceeding this temperature may damage the components.
Do not apply heat directly to parts in an ECU.
WATER SPRINKLING METHOD: When a malfunction seems to occur on a rainy day or in high-humidity.
Sprinkle water onto the vehicle and check if the malfunction occurs.
Note
Never sprinkle water directly into the engine compartment. Indirectly change the temperature and humidity by spraying water onto the front of the radiator.
Never apply water directly onto the electronic components.
Tech Tips
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.
HIGH ELECTRICAL LOAD METHOD: When a malfunction seems to occur when the electrical load is high.
Turn on the heater blower, headlights, rear window defogger and all other electrical loads. Check if the malfunction recurs.
DIAGNOSTIC TROUBLE CODE CHART
Look for output Diagnostic Trouble Codes (DTCs) (from the DTC checks) in the Diagnostic Trouble Code chart of the appropriate section. Use the chart to determine the trouble area and the proper inspection procedure. A description of each of the columns of the chart 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. |
DTC Detection Condition | Indicates the condition in which a DTC is stored. |
Trouble Area | Indicates the suspected areas of the problem. |
Link | Indicates the page where the inspection procedure for each circuit is to be found, or gives instruction for checking and repairs. |
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.
Tech Tips
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. |
Link | Indicates the page where the inspection procedure is located. |
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.
Tech Tips
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. |
Link | Indicates the page where the inspection procedure is located. |