EPS System Check
EPS System CheckWARNING: Carry out test drive in light traffic area to prevent an accident.
Refer to the following items for the details of each step.
Step 1-5:
Step 6-10:
Step 11:
NOTE:
^ As execution of DTC Clearance: Electric Type will clear all DTCs, be sure to record all DTCs before service.
^ DTC C1122 is indicated when ignition switch is at ON position and engine is not running, it means that nothing is abnormal.
^ Current DTC and history DTC can be identified by condition of the "EPS" warning light. "EPS" warning light operates as follows.
Step 1: Customer Complaint Analysis
Record details of the problem (failure, complaint) and how it occurred as described by the customer. For this purpose, use of such an inspection form will facilitate collecting information to the point required for proper analysis and diagnosis. Check if the problem described in "Customer questionnaire" actually occurs in the vehicle if necessary. (This step should be performed with the customer if possible)
Customer questionnaire (Example)
Step 2: DTC check, record and clearance
First, check DTC (including pending DTC). If DTC exists, print or write down DTC and then clear them.
DTC indicates malfunction in the system but it is not possible to know from it whether the malfunction is occurring now or it occurred in the past and normal condition has been restored. In order to know that, check symptom in question according to Step 5 and then recheck DTC according to Step 6 and 7.
Diagnosing a trouble based on the DTC in this step only or failure to clear the DTC in this step may result in an faulty diagnosis, trouble diagnosis of a normal circuit or difficulty in troubleshooting which is otherwise unnecessary.
Step 3 and Step 4: Visual inspection
As a preliminary step, be sure to perform visual check of the items that support proper function of the P/S system.
Step 5: Trouble Symptom Confirmation
Based on information obtained in "Step 1: Customer Complaint Analysis:" and "Step 2: DTC Check, Record and Clearance:", confirm trouble symptoms. Also, reconfirm trouble symptom by performing test drive and turning steering wheel fully to right and left at stopped vehicle.
Step 6 and 7: Rechecking and Record of DTC
Recheck for DTC.
Step 8: Steering Symptom Diagnosis and P/S System Symptom Diagnosis
Perform basic steering system check according to Steering Symptom Diagnosis first. When the end of the flow has been reached, check the parts of the system suspected as a possible cause and based on symptoms appearing on the vehicle (symptoms obtained through steps of customer complaint analysis, trouble symptom confirmation and/or basic engine check) and repair or replace faulty parts, if any.
Step 9: Troubleshooting for DTC (See each DTC Diag. Flow)
Based on the DTC indicated in Step 6 or 7, locate the cause of the trouble, namely in a sensor, switch, wire harness, connector, actuator, P/S control module or other part and repair or replace faulty parts.
Step 10: Intermittent Problems Check
Check parts where an intermittent trouble is easy to occur (e.g., wire harness, connector, etc.), and related circuit of DTC recorded in Step 2.
Step 11: Final Confirmation Test
Confirm that the problem symptom has gone and the P/S system is free from any abnormal conditions. If what has been repaired is related to the DTC, clear the DTC once, perform DTC confirmation procedure and confirm that no DTC is indicated.