Description of the test
The number below refers to the step numbers from the diagnosis table.
1. This step verifies that the battery and main electrical systems and connections to the "mass" car
2. The lack of communication may be caused by some kind of serial communication circuit failure.
3. This step performs diagnostics of the data link in accordance with the diagnostic trouble codes provided for it (DTC), prior to diagnosis according to the DTCs provided for the systems.
4. This step performs diagnostics of the electronic control unit (ECU) all DTCs assigned to it, prior to diagnosis according to DTCs assigned to other systems.
5. This step runs diagnostics on all devices for voltage supply DTCs, prior to diagnostics for other system DTCs.
Diagnostic system check
Step | Operation | Values | Yes | No |
1 |
Carry out the following preliminary checks:
Fault found and corrected?
|
-
|
System OK
|
Go to operation 2
|
2 |
Install the diagnostic tool.
Does the scan tool turn on?
|
-
|
Go to operation 3
|
Go to item "Scan tool does not turn on"
|
3 |
Try to start the engine.
Does the crankshaft rotate?
|
-
|
Go to operation 4
|
See paragraph "The crankshaft does not turn" in the section 1E, "Engine electrical equipment"
|
4 |
Try to start the engine.
Does the engine start and idle?
|
-
|
Go to operation 5
|
|
5 |
Important: Do not clear any DTCs unless instructed to clear in the diagnostic procedure.
To obtain diagnostic trouble codes (DTC) for each of the controllers, use the corresponding menu items of the scanning tool.
Does the scan tool display any DTCs?
|
-
|
Go to operation 6
|
Go to item Symptoms of a malfunction. Engine controls
|
6 |
The scan tool displays any DTCs beginning with "U"?
|
-
|
Jump to the appropriate DTC table
|
-
|
7 |
Important: If these DTCs are present, troubleshoot those DTCs and then move on to other DTCs or symptoms.
Does the scan tool display any DTCs related to an internal controller failure?
|
-
|
Jump to the appropriate DTC table
|
Jump to operation 8
|
8 |
Important: If these DTCs are present, troubleshoot those DTCs and then move on to other DTCs or symptoms.
Does the scan tool display any DTCs related to a faulty battery/ignition voltage supply to the controller?
|
-
|
Jump to the appropriate DTC table
|
Go to operation 9
|
9 |
If multiple DTCs are stored, run diagnostics in the following order.
Are there any other symptoms that the customer is concerned about?
|
-
|
Go to item Symptoms of a malfunction. Engine controls
|
System OK
|