Fault-Tracing Information

Fault-tracing

Checking other diagnostic trouble codes (DTCs), engine control module (ECM)
Note! The quick test of the fuel tank system must be activated when running this fault-tracing. There must be no diagnostic trouble code(s) (DTC) for the evaporative emission system (EVAP) and valve (ECM-420X, ECM-421X) or leak diagnostic unit (ECM-432X, ECM-433X). These could prevent the leak diagnostic. Check that none of these diagnostic trouble codes (DTCs) are stored.

- Ignition on.
Activate reading off diagnostic trouble codes (DTCs).
If any of the above diagnostic trouble codes (DTCs) are stored they must be remedied and erased first.

Are any of the above diagnostic trouble codes (DTCs) stored?

Yes - DONE

No - Checking the status

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Checking the status

- The status of the fault can be determined by activating a quick test of the fuel tank system
- The fault is permanent if a fault is detected in the fuel tank system when running the quick test
- The fault is intermittent if no fault is detected in the fuel tank system when running the quick test
- Switch off the ignition to ensure that the status of the quick test for the fuel tank system is "Not completed". The test cannot be started if the status is "Completed"
- Ignition on
- Activate the quick test of the fuel tank system
- Read off the battery voltage, the status of the quick test of the fuel tank system and the status of the test phase. Check the parameters according to the conditions for starting the quick test of the fuel tank system.

Note! The following conditions must be met in order for the quick test of the fuel tank system to be run correctly.
Conditions for the quick test of the fuel tank system to start:
- There must be no diagnostic trouble codes (DTCs) stored for the evaporative emission system (EVAP) and valve or leak diagnostic unit
- Engine off, ignition on
- The battery voltage must be 11-14 V
- The status of the test phase must be "Not running".
- The status of the quick test for the fuel tank system must be "Not completed".

Note! The battery voltage must be correct throughout the entire test. The test can take up to 10 minutes depending on the amount of fuel in the tank. Connect a battery charger if necessary.

- Activate the quick test for the fuel tank system by clicking the start button. Click the stop button to cancel the test.
Check that the quick test has started by reading off the status of the test phase. The test has started when the status of the test phase is "Reference".
Wait until the test is complete. When the test is completed, the status of the test phase must be "Not running" and the status of the quick test for the fuel tank system must be "Completed".
If no faults are detected after the quick test of the fuel tank system, the test result for the leak diagnostic unit and the fuel tank system will be "No fault found". If the estimated leakage is very near the diagnostic trouble code limit (greater than 0.3mm), troubleshooting should probably be performed despite the Tank system, test result shows "No leakage found", especially if a diagnostic trouble code for leakage has been stored earlier.
If a fault is detected after the quick test of the fuel tank system is complete, the test result for the fuel tank system or leak diagnostic unit will be "Fault found" with the corresponding relevant diagnostic trouble code (DTC), depending on the fault.

Note! In the event of a warranty claim the results from the estimated leakage must be entered in repair order text!

Hint: A diagnostic trouble code (DTC) for the fault will be stored in the engine control module (ECM) if the test result is "Fault found".

Other information
- For information about leak diagnostics, see VIDA Design and Function
- Description of parameters, quick test of the fuel tank system, B5254T5 Description of Parameters, Quick Test of the Fuel Tank System
- Test phases, quick test fuel tank system, B5254T5 Test Phases, Quick Test Fuel Tank System

Select an alternative to continue when the test is completed:
1. All test results are OK, "No fault found".
2. The test result for the leak diagnostic unit (ECM-436X) is "Fault found".
3. The quick test does not start
4. The test result for the fuel tank system, major leak (ECM-439C) or minor leak (ECM-434C) is "Fault found".

1 - Intermittent fault

2 - Checking components and wiring

3 - Fault-tracing information:

4 - Fault-tracing information:

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Checking components and wiring
Check the leak diagnostic unit connectors. Check for contact resistance and oxidation.
Check the resistance of the pump motor between the leak diagnostic unit connector terminals #1 and #4 (leak diagnostic unit side).
Try a new leak diagnostic unit if no fault is found during the above fault-tracing.
Remedy as necessary.

Other information
- Connecting the breakout box, B5254T5 Connecting the Breakout Box, Engine Control Module (ECM)
- Signal specification, B5254T5 Signal Specification, Engine Control Module (ECM)
- Component specifications, B5254T5 [1][2]Computers and Control Systems
- Checking wiring and terminals Checking Wiring and Terminals. Permanent Faults

Continue - Verification

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Fault-tracing information:
- The engine control module (ECM) is unable to run the reference phase to test the leak diagnostic unit. This may be because the conditions for starting the quick test of the fuel tank system have not been met, because the fault occurred during fault-tracing or because the fault existed before the fault-tracing began. Check that the hoses, connectors and components etc. have been correctly installed. Check the hoses, connectors and components etc. for damage.

Hint: Cancel fault-tracing for this fault. Then read off diagnostic trouble codes (DTCs) from the vehicle communication socket. Fault trace any other diagnostic trouble codes (DTCs) stored in the engine control module (ECM).

- Remedy as necessary.

Select a suitable alternative to continue:
1. Start this fault-tracing from the beginning again
2. Cancel fault-tracing for this fault.

1 - Checking other diagnostic trouble codes (DTCs), engine control module (ECM)

2 - DONE

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Fault-tracing information:
- The engine control module (ECM) has detected leakage in the fuel tank system. This may be because the fault existed before the fault-tracing was begun or that the fault occurred during the fault tracing. The fault is not relevant for this diagnostic trouble code (DTC) test.

Hint: Check that the hoses, components etc have been correctly installed. Check the hoses components etc. for damage.

- Remedy as necessary.

Select a suitable alternative to continue:
1. Start this fault-tracing from the beginning again
2. Fault trace for leakage in the fuel tank system
3. Finish fault-tracing.

1 - Checking other diagnostic trouble codes (DTCs), engine control module (ECM)

2 - ECM-434C/439C

3 - DONE

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ECM-434C/439C

Fault-tracing

Checking other diagnostic trouble codes (DTCs), engine control module (ECM)
Note! The quick test of the fuel tank system must be activated when running this fault-tracing. There must be no diagnostic trouble code(s) (DTC) for the evaporative emission system (EVAP) and valve (ECM-420X, ECM-421X) or leak diagnostic unit (ECM-432X, ECM-433X). These could prevent the leak diagnostic. Check that none of these diagnostic trouble codes (DTCs) are stored.

- Ignition on.
Activate reading off diagnostic trouble codes (DTCs).
If any of the above diagnostic trouble codes (DTCs) are stored they must be remedied and erased first.

Are any of the above diagnostic trouble codes (DTCs) stored?

Yes - DONE

No - Checking the status

------------------------

Checking the status

1 - Intermittent fault

2 - Checking components and wiring

3 - Fault-tracing information:

4 - Fault-tracing information:

------------------------

Checking components and wiring
Check the leak diagnostic unit connectors. Check for contact resistance and oxidation.
Check the resistance of the pump motor between the leak diagnostic unit connector terminals #1 and #4 (leak diagnostic unit side).
Try a new leak diagnostic unit if no fault is found during the above fault-tracing.
Remedy as necessary.

Other information
- Connecting the breakout box, B5254T5 Connecting the Breakout Box, Engine Control Module (ECM)
- Signal specification, B5254T5 Signal Specification, Engine Control Module (ECM)
- Component specifications, B5254T5 [1][2]Computers and Control Systems
- Checking wiring and terminals Checking Wiring and Terminals. Permanent Faults

Continue - Verification

------------------------

Fault-tracing information:
- The engine control module (ECM) is unable to run the reference phase to test the leak diagnostic unit. This may be because the conditions for starting the quick test of the fuel tank system have not been met, because the fault occurred during fault-tracing or because the fault existed before the fault-tracing began. Check that the hoses, connectors and components etc. have been correctly installed. Check the hoses, connectors and components etc. for damage.

Hint: Cancel fault-tracing for this fault. Then read off diagnostic trouble codes (DTCs) from the vehicle communication socket. Fault trace any other diagnostic trouble codes (DTCs) stored in the engine control module (ECM).

- Remedy as necessary.

Select a suitable alternative to continue:
1. Start this fault-tracing from the beginning again
2. Cancel fault-tracing for this fault.

1 - Checking other diagnostic trouble codes (DTCs), engine control module (ECM)

2 - DONE

------------------------

Fault-tracing information:
- The engine control module (ECM) has detected leakage in the fuel tank system. This may be because the fault existed before the fault-tracing was begun or that the fault occurred during the fault tracing. The fault is not relevant for this diagnostic trouble code (DTC) test.

Hint: Check that the hoses, components etc have been correctly installed. Check the hoses components etc. for damage.

- Remedy as necessary.

Select a suitable alternative to continue:
1. Start this fault-tracing from the beginning again
2. Fault trace for leakage in the fuel tank system
3. Finish fault-tracing.

1 - Checking other diagnostic trouble codes (DTCs), engine control module (ECM)

2 - ECM-434C/439C

3 - DONE

------------------------

ECM-434C/439C
Fault-tracing, B5254T5
FAULT FOUND - DONE

No Fault Found - No Fault Found

- DONE

- FAULT FOUND

------------------------

Intermittent fault
The engine control module (ECM) has previously detected a fault in the leak diagnostic unit but the fault is not active at present.
Check the leak diagnostic unit connectors. Check for contact resistance and oxidation.
Remedy as necessary.

Other information
- Connecting the breakout box, B5254T5 Connecting the Breakout Box, Engine Control Module (ECM)
- Signal specification, B5254T5 Signal Specification, Engine Control Module (ECM)
- Component specifications, B5254T5 [1][2]Computers and Control Systems
- Checking wiring and terminals Checking Wiring and Terminals. Permanent Faults

Continue - Fault-tracing information

------------------------

Verification

Verification

Hint: After carrying out the repair, check that the fault has been remedied.

- Switch off the ignition to ensure that the status of the quick test for the fuel tank system is "Not completed". The test cannot be started if the status is "Completed"
- Ignition on
- Activate the quick test of the fuel tank system
- Read off the battery voltage, the status of the quick test of the fuel tank system and the status of the test phase. Check the parameters according to the conditions for starting the quick test of the fuel tank system.

Note! The following conditions must be met in order for the quick test of the fuel tank system to be run correctly.
Conditions for the quick test of the fuel tank system to start:
- There must be no diagnostic trouble codes (DTCs) stored for the evaporative emission system (EVAP) and valve or leak diagnostic unit
- Engine off, ignition on
- The battery voltage must be 11-14 V
- The status of the test phase must be "Not running".
- The status of the quick test for the fuel tank system must be "Not completed".

Note! The battery voltage must be correct throughout the entire test. The test can take up to 10 minutes depending on the amount of fuel in the tank. Connect a battery charger if necessary.

- Activate the quick test for the fuel tank system by clicking the start button. Click the stop button to cancel the test.
Check that the quick test has started by reading off the status of the test phase. The test has started when the status of the test phase is "Reference".
Wait until the test is complete. When the test is completed, the status of the test phase must be "Not running" and the status of the quick test for the fuel tank system must be "Completed".
If no faults are detected after the quick test of the fuel tank system, the test result for the leak diagnostic unit and the fuel tank system will be "No fault found". If the estimated leakage is very near the diagnostic trouble code limit (greater than 0.3mm), troubleshooting should probably be performed despite the Tank system, test result shows "No leakage found", especially if a diagnostic trouble code for leakage has been stored earlier.
If a fault is detected after the quick test of the fuel tank system is complete, the test result for the fuel tank system or leak diagnostic unit will be "Fault found" with the corresponding relevant diagnostic trouble code (DTC), depending on the fault.

Note! In the event of a warranty claim the results from the estimated leakage must be entered in repair order text!

Hint: A diagnostic trouble code (DTC) for the fault will be stored in the engine control module (ECM) if the test result is "Fault found".

Other information
- For information about leak diagnostics, see VIDA Design and Function
- Description of parameters, quick test of the fuel tank system, B5254T5 Description of Parameters, Quick Test of the Fuel Tank System
- Test phases, quick test fuel tank system, B5254T5 Test Phases, Quick Test Fuel Tank System

Is the test result "No fault found" for all tests of the leak diagnostic unit and fuel tank system?

Yes - VERIFIED

No - VERIFICATION FAILED

------------------------

VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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Fault-tracing information

Information

Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Do you want to view the information again?

Yes - Attempt New Test

No - FAULT FOUND

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Attempt New Test - Checking other diagnostic trouble codes (DTCs), engine control module (ECM)

FAULT FOUND - DONE

-------------------------------------------------

Fault-tracing information

Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - Exit fault-tracing

No - Attempt New Test

------------------------

Attempt New Test - Checking other diagnostic trouble codes (DTCs), engine control module (ECM)

FAULT-TRACING FAILED - No Fault Found

-------------------------------------------------

FAULT FOUND - DONE

No Fault Found - No Fault Found

- DONE

- FAULT FOUND

-------------------------------------------------

Intermittent fault
The engine control module (ECM) has previously detected a fault in the leak diagnostic unit but the fault is not active at present.
Check the leak diagnostic unit connectors. Check for contact resistance and oxidation.
Remedy as necessary.

Other information
- Connecting the breakout box, B5254T5 Connecting the Breakout Box, Engine Control Module (ECM)
- Signal specification, B5254T5 Signal Specification, Engine Control Module (ECM)
- Component specifications, B5254T5 [1][2]Computers and Control Systems
- Checking wiring and terminals Checking Wiring and Terminals. Permanent Faults

Continue - Fault-tracing information

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Verification
Verification, B5254T5
VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

-------------------------------------------------

Fault-tracing information
Information
Attempt New Test - Checking other diagnostic trouble codes (DTCs), engine control module (ECM)

FAULT FOUND - DONE

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Fault-tracing information
Information
Attempt New Test - Checking other diagnostic trouble codes (DTCs), engine control module (ECM)

FAULT-TRACING FAILED - No Fault Found

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