Lexus ES: How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
- Use the following procedure to troubleshoot the power steering system.
- *: Use the Techstream.
PROCEDURE
| 1. | VEHICLE BROUGHT TO WORKSHOP |
|
| 2. | INSPECT AUXILIARY BATTERY |
(a) Turn the power switch off.
(b) Measure the voltage of the auxiliary battery.
Standard Voltage:
11 to 14 V
HINT:
If the voltage is below 11 V, recharge or replace the auxiliary battery before proceeding to the next step.
|
| 3. | CHECK DTC AND FREEZE FRAME DATA* |
HINT:
Refer to DTC Check / Clear.
Chassis > EMPS > Trouble Codes
|
| 4. | PROBLEM SYMPTOM CONFIRMATION |
| Result | Proceed to |
|---|---|
| Symptom does not occur. | A |
| Symptom occurs. | B |
| B |  | GO TO STEP 6 |
|
| 5. | SYMPTOM SIMULATION |
|
| 6. | CHECK CAN COMMUNICATION SYSTEM* |
(a) Check for DTCs.
Click here .gif)
| Result | Proceed to |
|---|---|
| CAN communication system DTCs are not output. | A |
| CAN communication system DTCs are output. | B |
HINT:
- If any CAN communication system DTCs are output, perform troubleshooting for the CAN communication system first.
- If communication to the rack and pinion power steering gear assembly cannot be established through the Techstream, inspect terminals CANH and CANL of the DLC3 and the rack and pinion power steering gear assembly, and the IG circuit of the rack and pinion power steering gear assembly.
| B | | PROCEED TO CAN COMMUNICATION SYSTEM |
|
| 7. | CHECK FOR DTC* |
(a) Check for DTCs.
Chassis > EMPS > Trouble CodesHINT:
Refer to Diagnostic Trouble Code Chart when any DTCs are output.
Click here
| Result | Proceed to |
|---|---|
| DTCs are not output. | A |
| DTCs are output. | B |
| B | | GO TO STEP 10 |
|
| 8. | PROBLEM SYMPTOMS TABLE |
(a) Refer to Problem Symptoms Table.
Click here
| Result | Proceed to |
|---|---|
| Fault is not listed in Problem Symptoms Table. | A |
| Fault is listed in Problem Symptoms Table. | B |
| B | | GO TO STEP 10 |
|
| 9. | OVERALL ANALYSIS AND TROUBLESHOOTING* |
(a) Refer to Terminals of ECU.
Click here
(b) Refer to Data List / Active Test.
Click here
|
| 10. | REPAIR OR REPLACE |
|
| 11. | CONFIRMATION TEST |
| NEXT | | END |
READ NEXT:
Calibration
CALIBRATION TORQUE SENSOR ZERO POINT CALIBRATION (USING TECHSTREAM) NOTICE: Perform torque sensor zero point calibration if any of the following conditions occur:
The rack and pinion power steering
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT:
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT:
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of
SEE MORE:
Front Sensor Communication Malfunction (C1AEC)
DESCRIPTION This DTC is stored when there is an open or short circuit in the communication line between the front sensors and the ECU, or when there is a malfunction in a front sensor. DTC No. Detection Item DTC Detection Condition Trouble Area C1AEC Front Sensor Communication Malfunc
Internal Control Module Software Incompatibility Invalid / Incompatible Software Component (U030057)
DESCRIPTION Forward recognition camera receives the vehicle information from the hybrid vehicle control ECU via CAN communication. DTC U030057 is stored when the vehicle information from the hybrid vehicle control ECU and that stored in the forward recognition camera do not match. DTC No. Detec
