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Home >> Volvo >> 2003 >> S40 L4-1.9L Turbo VIN 27 B4204T4 >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> ECM Codes (Engine Control Module) >> ECM-66 >> Leak Diagnostic. Signal Too Low. Permanent Fault >> Signal Too Low. Permanent Fault

Signal Too Low. Permanent Fault






Signal too low. Permanent fault

Other diagnostic trouble codes (DTCs)
Note! Any other diagnostic trouble codes (DTCs) in EMS2000 must be remedied and erased before this fault-tracing can be carried out.





Are any other diagnostic trouble codes (DTCs) stored?

Yes - Other diagnostic trouble codes (DTCs), continued

No - Checking the connectors and components

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Other diagnostic trouble codes (DTCs), continued

Have these diagnostic trouble codes (DTCs) been remedied?

Yes - Erasing diagnostic trouble code (DTC)

No - DONE

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Erasing diagnostic trouble code (DTC)




- Ignition on
- Erase diagnostic trouble codes (DTCs).





Continue - Checking the connectors and components

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Checking the connectors and components




- Ignition off
- Check the filter (1) between the leak diagnostic pump and the EVAP canister for blockage
- Remedy as necessary.





Was a fault detected?

Yes - Verification

No - Replacing the component

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Replacing the component




- Ignition off.
- Try a new leak diagnostic pump according to Replacing the leak diagnostic pump Removal and Replacement to check whether the fault is in the leak diagnostic pump.





Continue - Activating the leak diagnostic

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Activating the leak diagnostic




- Start the engine. Allow the engine to idle.

Note! The engine must be idling throughout the test.

- Clicking the VCT2000 symbol to activate the leak diagnostic
- Wait until the engine coolant temperature (ECT) exceeds 50°C
- Start the leak diagnostic. YES is displayed during leak diagnostics
- Wait until the leak diagnostic is complete. Leak diagnostic active NO and leak diagnostic complete YES is displayed when the leak diagnostic is complete.

Hint: The time taken for the diagnostic varies depending on the fault status of the fuel tank system. The diagnostic may take up to 4 minutes.

- Read off the results of the leak diagnostic. The leak diagnostic results are read off automatically when the test has been correctly completed
- The OK status will be displayed if the control module does not detect any faults. The Not OK status, numbered 1-8 will be displayed if the control module detects any faults
Note! The status types can be translated into diagnostic trouble codes (DTCs). However they are not stored as DTCs during this test.

Status definitions:
- OK = The system is free of faults
- Not OK, status 1 = Leak diagnostic pump, signal too low. (ECM-65, signal too low)
- Not OK, status 2 = Leak diagnostic pump, signal too high. (ECM-65, signal too high)
- Not OK, status 3 = Leak diagnostic pump, faulty signal. (ECM-65, faulty signal)
- Not OK, status 4 = Leak diagnostic pump, blocked hose. (ECM-66, signal too low)
- Not OK, status 5 = Leakage 0.5 mm. (ECM-68, minor leak)
- Not OK, status 6 = Leakage 1 mm. (ECM-68, major leak)
- Not OK, status 7 = Leakage larger than 1 mm. (ECM-68, Fuel tank filler cap missing)
- Not OK, status 8 = Evaporative emission (EVAP) system blocked. (ECM-6A, signal too low).

Select a suitable alternative to continue:
1. Status OK
2. Status Not OK, status for the present diagnostic trouble code (DTC) detected
3. Status Not OK, another diagnostic trouble code (DTC) has been detected.






1 - FAULT FOUND

2 - Checking hoses

3 - Other diagnostic trouble codes (DTCs)

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Checking hoses
- The fault may be due to blocked hoses between the leak diagnostic pump and the EVAP canister and the hoses between the EVAP canister and the tank
- Reinstall the old leak diagnostic pump
- Check if the hoses between the leak diagnostic pump and the EVAP canister and between the EVAP canister and the fuel tank are blocked.
Dismantle the fuel tank if necessary.

Other information
- To remove the fuel tank, see Fuel tank, replacing Removal and Replacement

Continue - Verification

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Verification




Verification

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

Note! This test cannot be performed if there are diagnostic trouble codes (DTCs) stored in EMS2000.




- Reinstall the components, reconnect the connectors etc.
- Ignition on
- Check that no other diagnostic trouble codes (DTCs) are stored. If other diagnostic trouble codes (DTCs) are stored, these must be remedied and erased first.





Are any other diagnostic trouble codes (DTCs) stored?

Yes - Fault-tracing information:

No - Activating the leak diagnostic

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Activating the leak diagnostic

Hint: If the test does not launch, this could be because the evaporative emission system (EVAP) control has not been active above a certain level. The control must change the level between each quick test carried out. The level is reached by allowing the engine to idle for approximately 5 minutes.




- Start the engine. Allow the engine to idle.

Note! The engine must be idling throughout the test.

- Clicking the VCT2000 symbol to activate the leak diagnostic
- Wait until the engine coolant temperature (ECT) exceeds 60 °C
- Start the leak diagnostic. YES is displayed during leak diagnostics
- Wait until the leak diagnostic is complete. Leak diagnostic active NO and leak diagnostic complete YES is displayed when the leak diagnostic is complete.

Hint: The time taken for the diagnostic varies depending on the fault status of the fuel tank system. The diagnostic process may take up to 4 minutes.

- Read off the results of the leak diagnostic. The leak diagnostic results are read off automatically when the test has been correctly completed
- The OK status will be displayed if the control module has not detected any faults. The Not OK status, and a number from 1-8 will be displayed if the control module has detected any faults. To interpret these faults, see the status definitions below.

Note! The status types can be translated into diagnostic trouble codes (DTCs). However they are not stored as DTCs during this test.

- Click the stop button to re-run the test.

Status definitions:
- OK = The system is free of faults
- Not OK, status 1 = Leak diagnostic pump, signal too low. (ECM-65, signal too low)
- Not OK, status 2 = Leak diagnostic pump, signal too high. (ECM-65, signal too high)
- Not OK, status 3 = Leak diagnostic pump, faulty signal. (ECM-65, faulty signal)
- Not OK, status 4 = Leak diagnostic pump, blocked hose. (ECM-66, signal too low)
- Not OK, status 5 = Leakage 0.5 mm. (ECM-68, minor leak)
- Not OK, status 6 = Leakage 1 mm. (ECM-68, major leak)
- Not OK, status 7 = Leakage larger than 1 mm. (ECM-68, Fuel tank filler cap missing)
- Not OK, status 8 = Evaporative emission (EVAP) system blocked. (ECM-6A, signal too low).

Select a suitable alternative to continue:
1. The status is OK
2. Status Not OK (for the current diagnostic trouble code (DTC)) has been detected
3. Status Not OK, (for another diagnostic trouble code (DTC)) has been detected.






1 - VERIFIED

2 - VERIFICATION FAILED

3 - Fault-tracing information:

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Fault-tracing information:
- The control module has detected a fault other than the one that affects the relevant diagnostic trouble code (DTC). This may be because a fault occurred during the fault-tracing. Check that the hoses, connectors and components etc have been correctly reinstalled. Check that they are not damaged.

Continue - VERIFIED

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Fault-tracing information:
- This diagnostic trouble code (DTC) cannot be verified before other DTCs have been remedied and erased
- Fault-trace, remedy and erase other diagnostic trouble codes (DTCs) first. Then select this diagnostic trouble code (DTC) to perform verification.

Continue - VERIFICATION FAILED

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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 - Other diagnostic trouble codes (DTCs)

FAULT-TRACING FAILED - No Fault Found

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