Explanation of basic diagnostic procedures
NOTE:
Perform troubleshooting according to the following diagnostic procedures. Only the basic procedures are shown here. For details, refer to the
most effective procedures for each circuit as described in each system article. Before beginning troubleshooting of the corresponding circuit, check the troubleshooting procedures first.
- Bring in the car
Next
- Customer interview and malfunction analysis
- Check with the customer regarding the status and conditions when the malfunction occurred, and create an check list for interview.
Next
- Check with the customer regarding the status and conditions when the malfunction occurred, and create an check list for interview.
- Malfunction phenomenon check and diagnostic code (including freeze frame data) inspection
- Measure the battery voltage.
Voltage: 11 to 14 V (engine stopped)
- Visually check for any blown out fuses, open or short circuit in the wiring harness, or poor contact of the connectors.
- Check the malfunction phenomenon and conditions, and inspect the diagnostic code according to the corresponding chart.
Diagnostic code is present: Refer to List of diagnostic codes . No diagnostic code: Refer to Symptom table .
Next
- Measure the battery voltage.
- Ascertaining vehicle conditions
- As some systems return to the initial conditions when parts are replaced, it is necessary to ascertain the vehicle setting conditions before repairing.NOTE: Setting procedures at parts removal/installation (refer to SETTING PROCEDURES AT PARTS REPLACEMENT AND REMOVAL/INSTALLATION )
Next
- As some systems return to the initial conditions when parts are replaced, it is necessary to ascertain the vehicle setting conditions before repairing.
- Circuit/Parts inspection
- Use the list of diagnostic codes or symptom table to check which system circuits and parts should be inspected.
Next
- Use the list of diagnostic codes or symptom table to check which system circuits and parts should be inspected.
- Repair malfunction location
- According to Step 5, repair the system or part where the malfunction is found.
Next
- According to Step 5, repair the system or part where the malfunction is found.
- Confirmation test
- After repair, confirm that the malfunction no longer exists. (If the malfunction recurs, perform the confirmation test again under the same environment and conditions in which the malfunction initially occurred.)
- For malfunctions containing diagnostic codes, confirm the results of the diagnostic judgement.
Next
- Vehicle restoration
- Return all vehicle settings to the vehicle conditions checked in Step 4.NOTE: It is necessary to inform the customer of any locations that could not be returned to the original setting.
Next: Complete
- Return all vehicle settings to the vehicle conditions checked in Step 4.