SEAT Workshop Service and Repair Manuals

Analysis measurement value blocks, display groups 10...29 -ignition-

Display group 10 -ignition-
l  Engine idling
Read measurement value block 10			→	← The display reads
xxxx rpm	xxx.x %	xxx.x %	xx.x° before TDC
1	2	3	4	← Display fields	Target value	Analysis
				Ignition advance angle	-5.0...10.0° before TDC	---
			Throttle valve angle (potentiometer 1 -G187-)		0.2...5.0 %	→ Anchor
		Engine load			15.0...30.0 %	→ Anchor
	Engine revs (idling revs)				810...890 rpm	→ Anchor

Note on display field 3:

t	With the accelerator floored, the display should show an approximate value of 100.0 %.

Analysis display group 10, display field 2 - engine load

The display reads	Possible cause of the fault	Elimination of the fault
Below 15.0 %	t  Lower values can only occur when decelerating	---
Over 30.0 %	t  Idling faulty (does not work in all cylinders)	–  Test the injectors → Chapter. –  Test the ignition wiring and spark plugs → Chapter.
	t  Throttle valve drive unit, faulty	–  Test the throttle valve drive unit → Chapter.
	t  Electrical consumers on	–  Switch off the electrical consumers.
	t  Steering wheel to limit	–  Centre the steering wheel.

Analysis display group 10, display field 3 - throttle valve angle, potentiometer 1

The display reads	Possible cause of the fault	Elimination of the fault
Over 5 %	t  Adaptation of engine control unit to throttle valve drive not carried out	–  Adapt the engine control unit to the throttle valve drive unit → Chapter.
	t  Throttle valve potentiometer, in throttle valve drive unit, faulty	–  Test the throttle valve drive unit → Chapter.
	t  Throttle valve jammed	–  Eliminate the cause.

Display group 14 -ignition- total ignition faults found
l  Running
Read measurement value block 14			→	← The display reads
xxxx rpm	xx.x %	xxx	text
1	2	3	4	← Display fields	Target value	Analysis
				Ignition fault finding (activated, deactivated)	activated	---
			Total ignition faults		0	→ Anchor
		Engine load			15.0...100.0 %	---
	Engine revs				810...5700 rpm	---

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

The display reads	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 t  Ignition coil output stage 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.

Display group 15 -ignition-, fault finding cyl. 1 to cyl. 3
l  Running
Read measurement 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 fault cyl. 3		0	→ Anchor
		Ignition fault cyl. 2			0	→ Anchor
	Ignition fault cyl. 1				0	→ Anchor

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

Analysis display group 15, display fields 1 to 3 or display group 16, address field 1 - ignition faults cyl. 1 to cyl. 4

The display reads	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 t  Ignition coil output stage 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.

Display group 20 -ignition- knock control cyl. 1 to cyl. 4
l  Running
Read measurement value block 20			→	← The display reads
xx.x °KW	xx.x °KW	xx.x °KW	xx.x °KW
1	2	3	4	← Display fields	Target value	Analysis
				Cylinder 4 ignition angle retarded by knock control	0.0...12.0° crankshaft	→ Anchor
			Cylinder 3 ignition angle retarded by knock control		0.0...12.0° crankshaft	→ Anchor
		Cylinder 2 ignition angle retarded by knock control			0.0...12.0° crankshaft	→ Anchor
	Cylinder 1 ignition angle retarded by knock control				0.0...12.0° crankshaft	→ Anchor

Note on display fields 1 through 4:

t	At idling the display should read 0.0° crankshaft.

Analysis display group 20, display fields 1 through 4 - ignition angle retard cyl. 1 through cyl. 4

The display reads	Possible cause of the fault	Elimination of the fault
All cylinders above 12.0° crankshaft	t  Knock sensor faulty	–  Test the knock sensor → Chapter.
	t  Connector corroded
	t  Knock sensor, tightening incorrect	–  Loosen the knock sensor and retighten to 20 Nm.
	t  Accessory engine components, loose	–  Fix the accessory components.
	t  Poor fuel quality	–  Change fuel type.
One cylinder differs greatly from the others	t  Connection corroded	–  Test the knock sensor → Chapter.
	t  Engine faulty	–  Test the compression: → Rep. Gr.15.
	t  Accessory engine components, loose	–  Fix the accessory components.

Display group 22 -ignition- knock control cyl. 1 and cyl. 2
l  Running
Read measurement value block 22			→	← The display reads
xxxx rpm	xxx.x %	xx.x °KW	xx.x °KW
1	2	3	4	← Display fields	Target value	Analysis
				Cylinder 2 ignition angle retarded by knock control	0.0...12.0° crankshaft	→ Anchor
			Cylinder 1 ignition angle retarded by knock control		0.0...12.0° crankshaft	→ Anchor
		Engine load			15.0...100.0 %	---
	Engine revs				810...5700 rpm	---

Note on display fields 3 and 4:

t	At idling the display should read 0.0° crankshaft.

Display group 23 -ignition- knock control cyl. 3 and cyl. 4
l  Running
Read measurement value block 23			→	← The display reads
xxxx rpm	xxx.x %	xx.x °KW	xx.x °KW
1	2	3	4	← Display fields	Target value	Analysis
				Cylinder 4 ignition angle retarded by knock control	0.0...12.0° crankshaft	→ Anchor
			Cylinder 3 ignition angle retarded by knock control		0.0...12.0° crankshaft	→ Anchor
		Engine load			15.0...100.0 %	---
	Engine revs				810...5700 rpm	---

Note on display fields 3 and 4:

t	At idling the display should read 0.0° crankshaft.

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

The display reads	Possible cause of the fault	Elimination of the fault
All cylinders above 12.0° crankshaft	t  Knock sensor faulty	–  Test the knock sensor → Chapter.
	t  Connector corroded
	t  Knock sensor, tightening incorrect	–  Loosen the knock sensor and retighten to 20 Nm.
	t  Accessory engine components, loose	–  Fix the accessory components.
	t  Poor fuel quality	–  Change fuel type.
One cylinder differs greatly from the others	t  Connector corroded	–  Test the 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
l  Control unit in mode 04 - Basic settings
Read measurement value block 28			→	← The display reads
xxxx rpm	xxx.x %	xxx.x °C	text
1	2	3	4	← Display fields	Target value	Analysis
				Result of knock sensor test (Test ON/Test OFF/Syst. OK/Syst. not OK)	Sys. OK	---
			Coolant temperature		80.0...110.0 °C	→ Anchor
		Engine load			15.0...100.0 %	---
	Engine revs				2200...5700 rpm	---