Part 1
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 - No Fault Found
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.
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".
Note! In the event of a warranty claim the results from the estimated leakage must be entered in repair order text!
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 fuel tank system, major leak (ECM-439C) or minor leak (ECM-434C) is "Fault found".
3. The quick test does not start or the test result for the leak diagnostic unit (ECM-436X) is "Fault found".
1 - Intermittent fault
2 - Checking components
3 - Fault-tracing information:
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Checking components
- Check that the fuel tank filler cap is properly installed. Check that the seal of the fuel tank filler cap is not damaged
- Check the hoses and connections on the leak diagnostic unit, the EVAP canister, EVAP canister purge valve and fuel filler pipe visually. Check for damage or loose installation
- Remedy as necessary.
Hint: Diagnostic trouble codes (DTCs) caused by a loose fuel filler cap or a hose connection may be difficult to find. If no leakage is detected by the engine control module (ECM) when activating the quick test of the fuel tank system after the checks and remedies above, the fault may have been repaired.
Other information
- To test pressurize the fuel tank system, see or depending on the available equipment.
Continue - Activating the quick test of the fuel tank system
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Activating the quick test of the fuel tank system
Hint: The fault remains if leakage is detected when running the quick test of the fuel tank system If no leak is detected, the fault has been repaired.
- 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.
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".
Note! In the event of a warranty claim the results from the estimated leakage must be entered in repair order text!
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 fuel tank system, major leak (ECM-439C) or minor leak (ECM-434C) is "Fault found".
3. The quick test does not start or the test result for the leak diagnostic unit (ECM-436X) is "Fault found".
1 - FAULT FOUND
2 - Checking EVAP canister purge valve
3 - Fault-tracing information:
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Checking EVAP canister purge valve
Hint: Leakage through the EVAP canister purge valve can be checked by blocking the hose between the EVAP canister and the purge valve and then running the quick test of the fuel tank system. If leakage was detected in a previous quick test of the fuel tank system but is not now detected when the hose between the EVAP canister and the purge valve is blocked, the leakage may be through the EVAP canister purge valve.
- Disconnect the hose between the EVAP canister purge valve and the EVAP canister from the connection to the EVAP canister purge valve. Block the hose while running the quick test of the fuel tank system.
Other information
- Location of components, engine compartment, B5254T5 Locations
Continue - Activating the quick test of the fuel tank system
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Activating the quick test of the fuel tank system
Hint: If no leakage was detected when running the quick test of the fuel tank system when the hose between the EVAP canister and the purge valve is blocked, the leakage may be through the EVAP canister purge valve.
- 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.
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".
Note! In the event of a warranty claim the results from the estimated leakage must be entered in repair order text!
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 fuel tank system, major leak (ECM-439C) or minor leak (ECM-434C) is "Fault found".
3. The quick test does not start or the test result for the leak diagnostic unit (ECM-436X) is "Fault found".
1 - Replacing the component
2 - Checking fuel tank system
3 - Fault-tracing information:
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