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Confirmation after Repair
When the electrical control system has been repaired, it is necessary to confirm after main unit repair whether the repair done was correct.If this confirmation is not done thoroughly, messages may display again or operability problems may occur when the main unit is handed over to the customer.It is especially necessary to recreate customer complaint conditions and confirm repair for intermittent problems.
Main unit repair confirmation
Main unit repair confirmation is effective if a service support check is used.When repair is complete, the person diagnosing the main unit should perform the following steps.
1. Either the diagnostic trouble code and scan tool data appearing during diagnosis or both should be reviewed and recorded. 2. Delete the diagnostic trouble code. 3. Operate the main unit according to the scan tool data. 4. Check the diagnostic trouble codes status information of the diagnostic trouble codes specified when diagnosis was performed until diagnostic tests related to those diagnostic trouble codes are performed by the control unit. Implementation of these steps is very important when repair is confirmed through a service support check.Neglecting implementation of these steps sometimes makes otherwise unnecessary repair necessary.
Final Confirmation Items List
No. Item Purpose Method
1
2 Checking diagnostic trouble codes Confirmation of the idling speed after engine warm up Checking after repair concerning a displayed diagnostic trouble code display
This is done to confirm that idling control is operating normally. Delete the previous diagnostic trouble code.Sufficiently warm up the engine through idling, and then raise the engine speed to the maximum in order to perform racing operation and achieve test conditions.
Confirm that the idling speed after the engine has warmed up is constant in no-load conditions.If a problem is detected, see the unstable idling during diagnosis for each symptom.
3 Confirmation of the scan tools data list Confirm whether engine control and communication are normal or abnormal during standard conditions. Monitor the scan tools data list and use the representative values list to check. Confirm the scan tools data list representative values.
4 Confirmation of restartability
5 Confirmation of high-powered electrical signal transmission device This is done to confirm that start control is operating normally. When a electrical signal transmission part such as a transceiver has been mounted, confirm that there is no electromagnetic interference being emitted as a result. Confirm that the cranking time is 5 sec. or less and the engine speed stabilizes after the engine has been started during restarting.
Confirm that the engine idling speed changes when switching between "ON" and "OFF" is performed with an electrical signal transmission part such as a transceiver.If a problem is discovered, inform the customer of the necessity of changing the installation location and output of the electrical signal transmission device.
Supplemental information for confirmation of high-powered electrical signal transmission device: If a problem is discovered with this item, contact the customer as necessary concerning the following items. • For parts that are installed after shipping, follow the individual installation procedures to securely install each part. • Antenna codes should be installed at a location at least 20 cm (7.8 in) away from main unit electrical system components such as the control unit and sensors. • Do not mix antenna cords with other wiring.Also, place antenna cords and other wiring as far away from each other as possible. • For parts that are installed after shipping, follow the individual installation procedures to securely install each part. • Do not install high-output movement communication devices.
Caution: When repair confirmation is done through a service support check, following the steps below.If these steps are not followed, unnecessary repair may be performed. •Review and record the scan tool data related to diagnostic trouble code for which diagnosis was performed. •Clear the diagnostic trouble code. •Operate the main unit while checking the related scan tool data.
Diagnostic Trouble Code Deletion Method Diagnostic trouble code deletion
When an abnormality has occurred in the system and a diagnostic trouble code is recorded in the engine control module (ECM), the diagnostic trouble code will not be deleted from memory even if the location of the trouble is repaired. Forced deletion is done according to separate procedures. For information on diagnostic trouble codes stored in computer A of the main unit, see the Service Support items in the main unit service text.
