Ignition and Control Systems - Specifications, Other (Xc): Diagnosis Volvo V70 II

Leak diagnostic unit pump

Graphic display in the fuel tank system quick test.

Measurement range 0-400 mA.

The engine control module (ECM) calculates the value from the pump in the leak diagnostic unit.

The value varies depending on the pressure in the fuel tank system. Higher pressure results in increased power consumption.

Fuel tank system quick test

In order for the quick test to start, the status of this parameter must be "Not completed".

1. Completed = The engine control module (ECM) has completed the quick test / diagnostic of the fuel tank system during the present operating cycle
2. Not completed = The engine control module (ECM) has not completed the quick test / diagnostic of the fuel tank system during the present operating cycle.

Test phase

In order for the quick test to start, the status of this parameter must be "Not running".

The parameter indicates the phase of the test.

1. Reference= Reference phase for leaks and function test of the leak diagnostic unit is running
2. Fuel tank system = Diagnostics for major leak and minor leak running
3. Not running = No quick test or diagnostic is running.

For more information about these parameters

See Test phases, quick test fuel tank system

(Not available in the quick test of the fuel tank system which is run as part of the diagnostic trouble code (DTC) test)

Graphic display in the quick test of the fuel tank system, vehicle communication socket.

Measurement range 0-400 mA.

The control module calculates the value from the pump in the leak diagnostic unit.

The value varies depending on the pressure in the fuel tank system. Higher pressure results in increased power consumption.

In order for the quick test to start, the status of this parameter must be: NOT COMPLETED.

1. COMPLETED = The control module has completed the quick test / diagnostic of the fuel tank system during the present operating cycle
2. NOT COMPLETED = The control module has not completed the quick test / diagnostic of the fuel tank system during the present operating cycle.

In order for the quick test to start, the status of this parameter must be: NOT RUNNING.

The parameter indicates the phase of the test.

1. REFERENCE 1 = Reference phase for leaks of 0.5 mm and function test of the leak diagnostic unit is running
2. MAJOR LEAK = Diagnostic for major leaks is running
3. MINOR LEAK = Diagnostic for minor leaks is running
4. REFERENCE 2 = Reference phase for leaks and function test of the leak diagnostic unit is running. This phase is only run if leakage is detected in the MINOR LEAK or MAJOR LEAK test phase
5. NOT RUNNING = No quick test or diagnostic is running.

For more information about these parameters, see Test phases .

Test phases

1. REFERENCE PHASE1: Reference phase for leaks of 0.5 mm and function test of the leak diagnostic unit is running. If any faults are detected during this phase the major leak test starts. If any faults are detected during the phase the test and the test result for the leak diagnostic unit will be " FAULT FOUND" with the fault type
2. MAJOR LEAK : Leak diagnosis for major leaks is in progress. If leakage is detected during this phase the minor leak test starts. If leakage is detected during this phase (the power consumption of the pump is equal to or lower than a desired value), the control module will run reference phase 2
3. MINOR LEAK : Leak diagnosis for minor leaks is in progress. If no leakage is detected during this phase the test stops and the test result for the fuel tank system will be "NO FAULT FOUND". If leakage is detected during this phase (the power consumption of the pump is equal to or lower than the power consumption during the reference phase), the control module will run reference phase 2
4. REFERENCE PHASE 2: The control module runs a second reference phase (the function of the leak diagnostic unit is checked) if leakage is detected during the leakage diagnostic phase (major leak or minor leak). When this phase is completed and if no fault is detected by the leak diagnostic unit, the test result for the fuel tank system will be "FAULT FOUND, MINOR LEAK" or "FAULT FOUND, MAJOR LEAK".
5. NOT RUNNING : The leak diagnostic is not running, the quick test of the fuel tank system has not started or has finished.

Test results for the leak diagnostic unit

The parameter displays the result of the diagnostic for the function of the leak diagnostic unit. The diagnostic is run during test phase REFERENCE PHASE 1.

1. NO FAULT FOUND = No fault is detected by the control module
2. FAULT FOUND, HIGH SIGNAL = Fault in the leak diagnostic unit detected by the control module. This fault status corresponds to diagnostic trouble code (DTC) ECM-431D, signal too high
3. FAULT FOUND, LOW SIGNAL = Fault in the leak diagnostic unit detected by the control module. This fault status corresponds to diagnostic trouble code (DTC) ECM-431D, signal too low
4. FAULT FOUND, FAULTY SIGNAL = Fault in the leak diagnostic unit detected by the control module. This fault status corresponds to diagnostic trouble code (DTC) ECM-431D, faulty signal
5. FAULT FOUND, SIGNAL MISSING = Fault in the leak diagnostic unit detected by the control module. This fault status corresponds to diagnostic trouble code (DTC) ECM-431D, signal missing.

Test results for the fuel tank system

The parameter indicates the result of the diagnostic for leakage in the fuel tank system. This diagnostic is run when during the MAJOR LEAK or MINOR LEAK test phases.

1. NO FAULT FOUND = No leakage is detected by the control module
2. FAULT FOUND, MINOR LEAK = Leakage of >0.5 mm detected by the control module. This fault status corresponds to diagnostic trouble code (DTC) ECM-400C, minor leak
3. FAULT FOUND, MAJOR LEAK = Leakage of >1 mm is detected by the control module. This fault status corresponds to diagnostic trouble code (DTC) ECM-400C, major leak.

Certain markets only.

Measurement range 0-400 mA.

The control module calculates the value from the pump in the leak diagnostic unit.

The value varies depending on the pressure in the fuel tank system. Higher pressure results in increased power consumption.

Certain markets only.

Measurement range 0-400 mA.

The control module calculates the value from the pump in the leak diagnostic unit.

The value varies depending on the pressure in the fuel tank system. Higher pressure results in increased power consumption.

Certain markets only.

Measurement range 0-400 mA.

The engine control module (ECM) calculates the value from the pump in the leak diagnostic unit.

The value varies depending on the pressure in the fuel tank system. Higher pressure results in increased power consumption.

Leak diagnostic unit, valve

Certain markets only.

A clicking noise is heard from the valve in the leak diagnostic unit at activation.