Minor Leak. Permanent Fault
Minor leak. Permanent fault
999 5646 Pressure gauge 999 5646 Pressure Gauge
Safety
First read Safety regulations for handling fuel Safety Regulations For Handling Fuel.
Continue - Checking cables and terminals
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Checking cables and terminals
Check that the fuel tank filler cap is on properly and that its seal is intact.
Check hoses and hose connectors at the EVAP canister, EVAP canister shut-off valve and fuel tank.
Remedy as necessary.
Carry out a quick test of the fuel system.
Continue - General about fuel tank system test
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General about fuel tank system test
The engine management system has the built-in function of carrying out a quick check of fuel tank system sealing. By activating the function the control module determines if the fuel tank system is fault free or if there is any leakage faster than usual. The condition for the test is that no diagnostic trouble codes (DTCs) are stored, engine temperature is above 70 °C (158°F) and that the engine is idling.
For further information about fuel tank system test diagnostic, see Leak diagnostic Leak Diagnostic.
1. Canister purge (CP) valve
2. EVAP canister
3. EVAP canister shut-off valve
4. Fuel tank pressure sensor
5. Air cleaner (ACL)
Location Of Components:
Continue - Checking engine coolant temperature (ECT)
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Checking engine coolant temperature (ECT)
Note! If the engine coolant temperature (ECT) is under 70 °C (158°F) the test cannot start.
- Start the engine.
- Read off engine coolant temperature (ECT)
If the engine coolant temperature (ECT) is under 70 °C (158°F) allow the engine to reach operating temperature or interrupt the test.
Is the temperature above 70 °C (158°F)?
Yes - Start the fuel tank system test
No - FAULT TRACING FAILED
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Start the fuel tank system test
Note! If the engine coolant temperature (ECT) is under 70 °C (158°F) the test cannot start.
- Engine idling.
- Start the quick test
Leak diagnostic active
This parameter displays that test is underway. When the parameter displays YES and has returned to NO the test is ready or has been interrupted.
Fault status
These parameters display the status of those diagnostic tests which are included in the leak diagnostic.
The following alternatives are available:
1. When the active leak diagnostic has displayed YES and then NO and all fault status have moved to clear, fault not found, the test has been run without any faults being found.
2. When the active leak diagnostic has displayed YES and then NO and one of the fault status displays fault found. A fault has been detected in that part of the test.
3. When the active leak diagnostic has displayed YES and then NO and one or several of the fault statuses has not gone and no fault is detected.
Or if active leak diagnostic unchanged status to YES.
The test has not started or been interrupted.
Try again or select 3 to interrupt.
Select an alternative?
1 - FAULT FOUND
2 - Test pressurization of the fuel tank system
3 - FAULT-TRACING FAILED
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Test pressurization of the fuel tank system
- Max 50 liters of fuel in the fuel tank.
- Ignition off.
- Clamp hose between EVAP canister shut-off valve and EVAP canister with a hose clip to seal it off.
- Carefully disconnect the EVAP canister hose from the canister purge (CP) valve.
Connect manometer 999 5646 Pressure gauge 999 5646 Pressure Gauge to hose and pressure regulator 999 5544 REGULATOR 999 5544 Regulator to manometer.
Set pressure to 7 kPa (1.02 psi) (read off on the manometer 999 5646 Pressure gauge 999 5646 Pressure Gauge ).
Cock at right angles to the hoses.
Warning! Max 10 kPa (1.45 psi).
Let the pressure build up for 5 minutes.
Shut off the cock (the pressure may drop 1-2 kPa (0.15-0.29 psi) before stabilizing) and read off pressure.
EVAP canister hose cock.
Wait for 10 minutes.
Warning! Never leave the car unattended with its system pressurized.
The pressure should be stable (it may rise a little due to fuel evaporation).
Is the pressure stable?
Yes - Checking hose to EVAP canister shut-off valve
No - Checking fuel tank system
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Checking hose to EVAP canister shut-off valve
Check hose to EVAP canister shut-off valve seal and check connectors.
Remedy as necessary.
Is the hose OK?
Yes - Replacing component
No - Verification
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Replacing component
Try a new EVAP canister shut-off valve according to Replacing the EVAP canister shut-off valve Replacing the EVAP Canister Shut-Off Valve.
Continue - Verification
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Checking fuel tank pressure sensor hose
- Ignition off.
- Remove fuel tank pressure sensor.
- Remove hose with Y-nipple.
Check that the nipple and hoses are not blocked.
Remedy as necessary.
Other information:
- To access/replace the fuel tank pressure sensor see Replacing fuel tank pressure sensor Removal and Replacement.
Was a fault detected?
Yes - Verification
No - Replacing component
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Replacing component
Try a new fuel tank pressure sensor according to Replacing fuel tank pressure sensor Removal and Replacement.
Continue - Verification
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Checking fuel tank system
- Ignition off.
- Carefully pressurize the fuel tank system to 7 kPa (1.02 psi).
EVAP canister shut-off valve right angles to the hoses.
Warning! Max 10 kPa (1.45 psi)
Check fuel tank system by spraying it with soapy water from the EVAP canister to the canister purge (CP) valve and on the line with the pressure regulator and roll-over valve to the fuel tank. Check filler pipe and fuel tank filler cap.
It may be necessary to lower the fuel tank in order to fault-trace hoses and connectors on top of the fuel tank.
Warning! Never leave the car unattended with its system pressurized.
Continue - Verification
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Verification
Verification
- Ignition off.
- Reinstall all hoses/components.
- Start the engine.
Activate the quick fuel tank system test.
Does the diagnostic trouble code (DTC) recur?
Yes - VERIFICATION FAILED
No - VERIFIED
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VERIFIED - FAULT FOUND
VERIFICATION FAILED - Fault-tracing information
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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
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Attempt New Test - Safety
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