Running Test

R. RUNNING TEST

RA. General

NOTE:

Use only the memory cassette indicated in the section Special tools. The messages contained in older versions of the cassette may have different meanings to those in this manual.

Applications




Faults are registered and stored in Running Test. Because the Volvo ST stores short term as well as long term faults the Volvo ST is suitable for intermittent faults.

Test Description

The ST tests signals in sequence and then starts from the beginning again. Certain tests are carried out in parallel while others require that the microcomputer works on one test at a time.

In certain cases different fault messages can be given for the same fault. This is because the secondary fault is only detected by the ST before the faulty signal is measured.

An example is a break in the RPM sensor signal which can give several different fault messages depending on the point at which the fault is detected in the test.

In several tests the ST needs to measure another value to ascertain whether a fault has occurred or if the value is normal. This means that a test can take so long that the ST cannot perform the entire test before engine speed has decreased to its lower limit.




An example is the power supply from the ignition switch. If the power supply is lost to MFI#35, DI#6 or power stage #4 the other units are tested before a fault message is logged. If all three units are without power the ST assumes that the ignition switch is in position 0.

Priority

A fault can generate secondary faults. The ST will display the primary fault first, followed by the others in order of priority.




Because the secondary faults have been generated by the primary fault only the primary fault is remedied. This does not apply if it is suspected that there are several independent faults in the system. The secondary fault will disappear when the primary fault has been remedied.

Primary faults not generating secondary ones will be displayed in the order in which they are detected.

Order Of Priority

1. Power supplies to the control module.

2. Control module connections to GND.

3. Sensor signals which affect the basic functions of the engine, engine speed signal for example.

4. Other signals, the idle switch for example.

Lower Engine Speed Limit

When the RPM sensor signal corresponds to a low engine speed, the control modules do not transmit any ignition pulses, injector pulses, relay control signals etc. and the engine stops.

The engine speed limit can vary depending on the setting of and wear on the RPM sensor and drive plate/flywheel.




The ST cannot tell if the signals disappear because of a fault or because the engine has stopped for some other reason. The ST will display End of test, No faults found.

Faults with lower priorities than the engine speed signal will not be saved. However faults with higher priorities, such as power supplies, will be stored if they are the cause of the engine stopping running.

RB. Special Messages

RB1

Start Engine Or Crank >10 Sec

An attempt must be made to start the engine within 10 seconds or an engine speed signal fault message will be logged.

START ENGINE
OR CRANK
>10 SEC.

If the engine does not start the starter motor must be operated for at least 10 seconds. This is so the ST can determine whether there is an engine speed signal.

RB2

To Continue Test Start Engine

1. The test is complete because the key has been turned to position 0 and no faults have been found.

2. Messages may also be received if there is a break in the power supply from the ignition switch to both MFI and DI.

TO CONTINUE TEST
START ENGINE

TO STOP: EXIT

-Continue testing in accordance with the flow diagram RC1.

RB3

End Of Crank, Fault Found

END OF CRANK
FAULT FOUND

TO STOP: EXIT

The engine will not start and the ST has found the fault.

-Press HELP, read off the fault messages and remedy in accordance with S. Running Test fault message table.

RB4

End Of Crank No Faults Found

END OF CRANK
FAULT FOUND

TO STOP: EXIT

The engine will not start but all signals monitored by the ST are correct. The engine does not start because of a fault in the FP or the high voltage system.

QB5

End Of Test, Fault Found

END OF TEST
FAULT FOUND
PRESS HELP
TO STOP: EXIT

1. The ST has found a fault which does not cause the engine to stop running and the ignition has been switched off.

2. The ST has found a fault which causes the engine to stop running.

-Press HELP, read off the fault messages and remedy in accordance with S. Running Test fault message table.

RB6

End Of Test, No Fault Found

END OF TEST
NO FAULT FOUND

TO STOP: EXIT

The engine has stopped running but the ST has not found a fault.

The message can be obtained in the following circumstances:

-Engine stops running when the clutch pedal is let up too quickly.

-If the ST has not managed to detect the fault before engine speed has dropped below the lower engine speed limit.

-The fault is in part of the DI system or fuel system not monitored by the ST. For example the high voltage system.

-Continue testing in accordance with the flow diagram RC2.

RB7

End Of Crank, Fault Found, Old Fault Exists

End Of Crank, No Fault Found, Old Fault Exists


END OF CRANK
FAULT FOUND
OLD FAULT EXIST

The ST has found a fault from a previous occasion. The fault has not been deleted which means that the ST will not perform all tests when the engine is being started. The message is displayed if the engine does not start.

Note that the logged fault messages need have no link with the fact that the car does not start.

END OF CRANK
FAULT FOUND
OLD FAULT EXIST

-Continue testing in accordance with the flow chart RC3.

RC. FLOW CHART USE

RC1

The engine will not start, the following message is displayed:

To continue test start engine




To continue fault tracing leave Running Test and-return to it again in order to carry out a complete test in start mode.

Depending on why the engine stops running the test will end with one of the two following messages.

Ignition on.

Press EXIT to leave Running Test.

Select RUNNING TEST with the arrow keys.

Press ENTER

Follow the message.

Operate the starter motor.

-Fault not detected by the ST.

-Permanent or intermittent fault detected by the ST.

RC2

The engine has stopped with the message:

End of test, no fault found


To continue fault tracing leave Running Test and return to it again in order to carry out a complete test in start mode.

Depending on why the engine stops running the test will end with one of the two following messages.




Ignition on.

Press EXIT to leave Running Test.

Select RUNNING TEST with the arrow keys.

Press ENTER.

Follow the message.

Operate the starter motor.

-Fault not detected by the ST

-Permanent or intermittent fault detected by the ST.

The Engine Will Not Start. Old Fault Exists.

To continue fault tracing the old fault message must be read and deleted. Leave Running Test and return to it again in order to carry out a complete test in start mode. Note that the old fault message need not necessarily have any connection with the engine not starting.

Depending on why the engine stops running the test will end with one of the two following messages.




Ignition on.

Press HELP to be able to delete the fault message.

Delete the fault message by pressing EXIT for more than 5 seconds.

Select RUNNING TEST with the arrow keys.

Press ENTER to go into Running Test.

Follow the message.

Operate the starter motor.

-Fault not detected by the ST.

-Permanent or intermittent fault detected by the ST.