How to Troubleshoot DTC

Describes the DTC or symptom title, and provides any general notes and advices for troubleshooting.

Describes the reason why the DTC was set.

A visual diagram that shows the system or circuit of the affected area. Component(s) or wire(s) that may have caused the DTC are indicated by a red, dotted-line.

NOTE: If all of the component(s) or wire(s) in the system or circuit are the possible cause, the red, dotted-line will surround the entire system or circuit

Test or inspection procedures referred to as Work Items are listed in a table.

A letter (a/b/c) in the left end of the table relates to the inspection item of the visual diagram.

NOTE: “-” represents inspection items are not described in the visual diagram.

Pick and choose the work item based on your preference and vehicle condition in any order. However, if you are unsure which work item to start with in any troubleshooting, start from the top and work your way down until you find the fault. In addition, if there are any efficient ways to do any particular work item or if an order should be followed, tips and advice will be shown.

If multiple work items are shown for one component, it is necessary to perform all of the listed inspections items.

Some inspection items may indicate to replace a component only. This should only be followed after clearing and confirming the DTC reappears.

Some inspection items may have different tests or inspection procedures depending on the vehicle condition. In these cases, a note is provided in the Inspection Outline on how to determine which Inspection Items are applicable.

Lists additional resources related to the system you are troubleshooting. These include circuit diagrams, the connector for inputs and outputs reference sheets, and advanced diagnostic sheets (powertain related DTC’s only).

When troubleshooting is launched with the i-HDS connected to the vehicle, certain HDS functions can be directly accessed. Depending on the troubleshooting they may include the following:

Describes the work item that was chosen from the inspection outline.

Any general notes and advice related to the test procedure are shown.

Describes the preconditions of the vehicle that have to be met, the type of test, criteria, and how to perform the test or inspection.

For circuit inspections, a table is provided to show what and how to test the circuit. Refer to the Terminal Inspection Table for details.

Describes the problem based on the test result. If no abnormality is found, perform another work item from the inspection outline.

A red frame surrounds the work item you chose from the inspection outline.

NOTE: It is important not to go beyond the red frame as the information applies to other work items.

As explained under the Inspection Outline description, some troubleshooting will require different test or inspection procedures based on the vehicle condition. Test only the items that are required for that condition. For example, if you determined that you need to do items listed under column “A” of the table under inspection outline, do only the circuit inspection listed under “A” of the Terminal Inspection Table.

NOTE: If no letter reference is listed, then you must do all of the listed circuit inspections.

Description of the circuit being tested.

Lists the ignition status the vehicle should be in during a particular test. Some may include an * which alerts you of any notes that needs to reviewed (at the bottom of the table).

Details of the connector being tested, its tested condition, whether to test from the male or female side are shown.

Shows an image of the connector being tested, it’s terminal location and how it should be viewed, whether it is male or female.

Shows what test to perform using symbols. Refer to the List of Symbols for a description of the symbols used.

Lists what the result should be if there are no problems.

The circuit type of the power supply may be shown.