Inspection Procedures

INSPECTION PROCEDURES

Diagnostic Function
- Whenever the starter switch is placed at ON, the diagnostic function is activated to check all the sensors, etc. If any of them is found faulty, the warning lamp in the meter cluster is lit to alert the driver. At the same time, the fault location is stored in memory, and the system enters the backup mode.

Warning Lamp Indications







- The stored fault location can be read as a diagnostic trouble code by the Multi-Use Tester II or the diagnosis switch.

CAUTION:
- Check to ensure that the battery voltage is within the specified range.
- Check all the harness and device connectors for looseness. Always remove a connector at least 20 seconds after placing the starter switch at the LOCK position.
- Do not forget to clear the diagnostic trouble code by the Multi-Use Tester II or memory clear switch after a fault has been rectified.
- As a rule, inspection operations should be performed with the starter switch at the LOCK position. Some checks, however, may have to be made with the starter switch at the ON position. In such a case, use care to make sure that no short circuit develops between pins of the connectors or with the body.
- The resistance value of each component is affected by the temperature and the accuracy of the tester. The reading, therefore, does not always fall within the standard limits. Note that the check values shown in the text are the values obtained at normal temperature (10 to 35 °C {58 to 95 °F}).
- Whether or not the system automatically returns to normal from the backup mode after a fault has been removed depends on the diagnostic trouble code (fault location). When the system returns to normal, the warning lamp will be OFF.
- Even when the fault has been removed and the system has been automatically returned to the normal mode, the diagnostic trouble code of the fault remains stored in the engine control unit.
- When a fault occurs at a point where the system is not automatically reset, perform the memory clear procedure to let the system exit from the backup mode.

Inspection Flowchart
The system inspection can be performed effectively by use of the Multi-Use Tester II. The types of system inspections may be broadly divided as shown below in accordance with the trouble symptoms and diagnostic trouble code outputs.
- Inspections based on diagnostic trouble codes stored in the engine control unit
- Inspections of intermittent troubles