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Checking signals from and to injection pump > < Identification of injection pump

A4 Mk1

Checking injection timing control range
Checking injection timing control range
Test condition
l  There must not be any faults stored relating to needle lift sender -G80-. If a fault is stored, you must first the check the needle lift sender. Renew if defective.
–  Start engine.
–  Coolant temperature must be at least 85°C.
–  Start basic setting function, Display group 04, engine running at idling speed.
The commencement of injection valve is alternately opened and closed for 10 seconds at a time.
–  Check readouts in display zones 2 and 3.
   
Display zone 2Display zone 3Possible cause of fault
AdvancedAbove
12.0°
BTDC
l  Okay - injection timing is sufficiently advanced
 Less than
12.0°
BTDC
l  Start of delivery not OK.
l  Control range of injection pump blocked
RetardedLess than
0°
BTDC
l  Okay - injection timing is sufficiently retarded
 Above
0°
BTDC
l  Start of delivery not OK.
l  Control range of injection pump blocked

If the specifications are not obtained by the injection timing control:
–  Check tank for petrol or biodiesel; if this is the case: drain tank and fill with diesel, erase fault memory and perform road test, then interrogate fault memory again
–  Check and adjust commencement of injection → Chapter
–  Drain fuel filter → Chapter
–  Check fuel system for leaks → Chapter.
–  Eliminate air in fuel system → Chapter
–  Interrogate and, if necessary, erase fault memory. Perform road test and repeat test.
If the specification is not obtained for a second time, renew injection pump → Chapter
   

Checking signals from and to injection pump > < Identification of injection pump