How to Proceed With Troubleshooting

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

HOW TO PROCEED WITH TROUBLESHOOTING

HINT:
- Use these procedures to troubleshoot the power steering system.
- *: Use a Techstream.

1. VEHICLE BROUGHT TO WORKSHOP
NEXT -- Continue to next step.

2. INSPECT BATTERY VOLTAGE
Standard voltage:
11 to 14 V
If the voltage is below 11 V, recharge or replace the battery before proceeding.
NEXT -- Continue to next step.

3. CUSTOMER PROBLEM ANALYSIS
NEXT -- Continue to next step.

4. PROBLEM SYMPTOM CONFIRMATION
NEXT -- Continue to next step.

5. CHECK CAN COMMUNICATION SYSTEM*
(a) Check for DTCs Diagnosis System.

Result





HINT:
- When any CAN communication system DTCs are output, perform troubleshooting on the CAN communication system first.
- When communication to the power steering ECU is not established through a Techstream, inspect terminals CANH and CANL of the DLC3 and the power steering ECU, and the IG circuit of the power steering ECU.

B -- PROCEED TO CAN COMMUNICATION SYSTEM
A -- Continue to next step.

6. CHECK VEHICLE STABILITY CONTROL SYSTEM*
(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

Result





HINT: When any vehicle stability control system DTCs are output, perform troubleshooting on the vehicle stability control system first.

A -- PROCEED TO VEHICLE STABILITY CONTROL SYSTEM
B -- Continue to next step.

7. CHECK SFI SYSTEM*
(a) Check for DTCs.
(3UR-FE: DTC Check / Clear)
(3UR-FBE: DTC Check / Clear)
(2UZ-FE: DTC Check / Clear)

Result





HINT: When any SFI system DTCs are output, perform troubleshooting on the SFI system first.

A -- PROCEED TO SFI SYSTEM
B -- Continue to next step.

8. PROBLEM SYMPTOMS TABLE

Result





B -- Go to step 10
A -- Continue to next step.

9. OVERALL ANALYSIS AND TROUBLESHOOTING
(a) Terminals of ECU Pinout Values and Diagnostic Parameters.
NEXT -- Continue to next step.

10. REPAIR OR REPLACE
NEXT -- Continue to next step.

11. CONFIRMATION TEST*
NEXT -- END