SEAT Workshop Service and Repair Manuals

Analysis measured value block, display groups 10...29 -ignition-

Display group 10 -ignition-
l  Engine idling
Read measur. value block 10			→	◂ The display reads
xxxx/min	xxx.x %	xxx.x %	xx.x° before TDC
1	2	3	4	◂ Display fields	Target value	Analysis
				Ignition angle	0...10° before TDC	--
			Throttle valve angle (potentiometer 1 -G187-)		0...11 %	→ Anchor
		Engine load			10...20 %	--
	Engine revs (idling revs)				640...930/min	--

Analysis display group 10, display field 2 - engine load

Display -V.A.G. 1551-	Possible cause of the fault	Elimination of the fault
less than the 10 %	t  Only lower values can be displayed when decelerating	---
more than the 20 %	t  Idling faulty (does not work in all cylinders)	–  Injector or sparkplugs faulty
	t  Throttle valve control unit, faulty	–  Test the throttle valve control unit → Chapter
	t  Electrical consumers on	–  Switch off the electrical consumers
	t  Steering wheel to limit	–  Set the steering wheel at centre position

Analysis display group 10, display field 3 - throttle valve angle

Display -V.A.G. 1551-	Possible cause of the fault	Elimination of the fault
over 11 %	t  Adaptation of engine control unit to throttle valve drive not carried out	–  Adapt the engine control unit to the throttle valve drive → Chapter
	t  Throttle valve potentiometer, in throttle valve drive, faulty	–  Test the throttle valve drive → Chapter
	t  Throttle valve jammed	–  Eliminate the cause

Display group 14 -ignition- total ignition faults
l  Running
Read measur. value block 14			→	◂ The display reads
xxxx/min	xx.x %	xxx	text
1	2	3	4	◂ Display fields	Target value	Analysis
				Fault finding (activated, deactivated)	activated	--
			Total ignition faults		0	→ Anchor
		Engine load			12.0...100.0 %	--
	Engine revs				790...6600/min	--

Analysis display group 14, display field 3 - total ignition faults

Display -V.A.G. 1551-	Possible cause of the fault	Elimination of the fault
more than 0	t  Spark plug faulty t  Spark plug connector faulty t  Ignition coil faulty	–  Test the spark plugs and ignition wiring with spark plug connectors → Chapter –  Test the ignition transformer → Chapter
	t  Injector faulty	–  Test the injectors → Chapter
	t  Exhaust gas recirculation valve, jammed	–  Test the exhaust gas recirculation valve → Chapter; Final control diagnosis

Display group 15 -ignition- fault finding from cyl. 1 to cyl. 3
l  Running
Read measur. value block 15			→	◂ The display reads
xxx	xxx	xxx	text
1	2	3	4	◂ Display fields	Target value	Analysis
				Fault finding (activated, deactivated)	activated	--
			Ignition faults at cyl. 3		0	→ Anchor
		Ignition faults at cyl. 2			0	→ Anchor
	Ignition faults at cyl. 1				0	→ Anchor

Display group 16 -ignition- fault finding cyl. 4
l  Running
Read measur. value block 16			→	◂ The display reads
xxx	--	--	text
1	2	3	4	◂ Display fields	Target value	Analysis
				Fault finding (activated, deactivated)	activated	--
	Ignition faults at cyl. 4				0	→ Anchor

Analysis display group 15, display fields 1 to 3 or display group 16, display field 1 - ignition faults from cylinder 1 to cylinder 4

Display -V.A.G. 1551-	Possible cause of the fault	Elimination of the fault
more than 0	t  Spark plug faulty t  Spark plug connector faulty t  Ignition coil faulty	–  Test the spark plugs and ignition wiring with spark plug connectors → Chapter –  Test the ignition transformer → Chapter
	t  Injector faulty	–  Test the injectors → Chapter
	t  Exhaust gas recirculation valve, jammed	–  Test the exhaust gas recirculation valve → Chapter; Final control diagnosis

Display group 22 -ignition- knock control cyl. 1 and cyl. 2
l  Running
Read measur. value block 22			→	◂ The display reads
xxxx/min	x.xx %	xx.x °KW	xx.x °KW
1	2	3	4	◂ Display fields	Target value	Analysis
				Retarded ignition angle cyl. 2 for knock control	0...14° crankshaft	--
			Retarded ignition angle cyl. 1 knock control		0...14° crankshaft	--
		Engine load			12.0...100.0 %	--
	Engine revs				790...6600/min	--

Display group 23 -ignition- knock control cyl. 3 and cyl. 4
l  Running
Read measur. value block 23			→	◂ The display reads
xxxx/min	x.xx %	xx.x °KW	xx.x °KW
1	2	3	4	◂ Display fields	Target value	Analysis
				Retarded ignition angle cyl. 4 knock control	0...14° crankshaft	--
			Retarded ignition angle cyl. 3 knock control		0...14° crankshaft	--
		Engine load			12.0...100.0 %	--
	Engine revs				790...6600/min	--

Analysis display group 22/23, display fields 3 and 4 - ignition angle retardation

Display -V.A.G. 1551-	Possible cause of the fault	Elimination of the fault
All the cylinders above 14° crankshaft	t  Knock sensor faulty	–  Test knock sensor → Chapter
	t  Connector corroded
	t  Knock sensor, faulty tightening	–  Loosen the knock sensor and tighten it to 20 Nm
	t  Accessory engine components, loose	–  Fix the accessory components
	t  Poor fuel quality	–  Change fuel type
One cylinder clearly diverges from the others	t  Connector corroded	–  Test knock sensor → Chapter
	t  Engine faulty	–  Test the compression: → Rep. Gr.15
	t  Accessory engine components, loose	–  Fix the accessory components

Display group 28 -ignition- knock control
l  Running
Read measur. value block 28			→	◂ The display reads
xxxx/min	xx.x %	xxx.x °C	--
1	2	3	4	◂ Display fields	Target value	Analysis
			Coolant temperature		40...110 °C	--
		Engine load			12.0...100.0 %	--
	Engine revs				790...6600/min	--