A/T System Check

Refer to the following items for the details of each step.

Fig 1: A/T System Check Chart

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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 an inspection form will facilitate collecting information to the point required for proper analysis and diagnosis.

   NOTE: The form is a standard sample. It should be modified according to conditions characteristic of each market.
   Fig 2: Customer Problem Inspection Form (Example)

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2. DTC/Freeze Frame Data Check, Record and Clearance 

   First referring to RETRIEVING DIAGNOSTIC TROUBLE CODES for H25 engine or RETRIEVING DIAGNOSTIC TROUBLE CODES for H27 engine , check DTCs (including pending DTCs). If DTC exists, print or write down DTC and freeze frame data and then clear them by referring to CLEARING DIAGNOSTIC TROUBLE CODES for H25 engine or CLEARING DIAGNOSTIC TROUBLE CODES for H27 engine . DTC indicates malfunction in the system but it is not possible to know from it whether the malfunction is occurring now or if 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.

   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.

3. Visual Inspection 

   As a preliminary step, be sure to perform visual check of the items that support proper function of the A/T and engine referring to Fig 3.

4. Trouble Symptom Confirmation 

   Check trouble symptoms based on information obtained in step  1 and step  2 .

   Also, recheck DTC according to "DTC Confirmation Procedure" described in each DTC flow.

5. Recheck and Record of DTC/Freeze Frame Data 

   Refer to RETRIEVING DIAGNOSTIC TROUBLE CODES for H25 engine or RETRIEVING DIAGNOSTIC TROUBLE CODES for H27 engine for checking procedure.

6. A/T Basic Check and A/T Trouble Diagnosis 

   Perform A/T basic check according to Fig 4 first. When the end of the flow has been reached, check the parts of the system suspected as a possible cause referring to Fig 5 and based on symptoms appearing on the vehicle (symptoms obtained through steps of customer complaint analysis, trouble symptom confirmation and/or A/T basic check) and repair or replace faulty parts, if any.

7. Troubleshooting for DTC 

   Based on the DTC indicated in Step  5 and referring to applicable DTC flow, locate the cause of the trouble, namely in a sensor, switch, wire harness, connector, actuator, PCM or other part and repair or replace faulty parts.

8. Check for Intermittent Problem 

   Check parts where and intermittent problem is easy to occur (e.g., wire harness, connector, etc.) referring to related circuit of DTC recorded in step  2.

9. Final Confirmation Test 

   Confirm that the problem symptom has gone and the A/T is free from any abnormal conditions.

   If what has been repaired is related to the malfunction DTC, clear the DTC once, set conditions under which DTC was detected and A/T and/or vehicle was repaired and confirm that no DTC is indicated.

Fig 3: Visual Inspection Chart

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Fig 4: A/T Basic Check Chart

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Fig 5: A/T Symptom Diagnosis Chart

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