Skoda Workshop Service and Repair Manuals

Reading measured value blocks, display groups from 001 to 028 Display group 000 in idle

Reading measured value block 0

< Readout on display

x

x

x

x

x

x

x

x

x

x

1

2

3

4

5

6

7

8

9

10

< Display field

Specification

corresponds to

Initialisation value of the fuel preparation under partial load

115…141

-5…+5 %

Initialisation value of the fuel preparation in idle

125…131

-2,25…+3 ms

Control value of the fuel preparation

102…154

-10…+10 %

Initialisation value idle stabilizer

105…150

-6…+6 %

Idling regulator

100…155

-6…+6 %

Throttle valve angle 1.0 ltr. engine 1.4 ltr. engine

2…10 3…12

1…5° 1,5…6°

Vehicle voltage

120…144

11,4…14,4 V

Engine speed (idling speed) 1.0 ltr. engine 1.4 ltr. engine

20…24 23…27

630...770 rpm 730...870 rpm

Disregard display

---

---

Coolant temperature

171…217

80…115 °C

Analysis: Display group 000, display field 1 - coolant temperature

Display -V.A.G 1552-	Possible cause of fault	Rectifying fault
less than 171	t  Engine too cold t  Coolant temperature sender -G62- or cable connection to engine control unit faulty	–  Conduct road test if necessary. –  Coolant temperature sender -G62- → Chapter.
above 217	t  Radiator dirty t  Radiator fan not operational t  Coolant regulator (thermostat) defective t  Coolant temperature sender -G62- or cable connection to engine control unit faulty	–  Clean radiator. –  Test function of the radiator fan. –  Inspect coolant regulator (thermostat). –  Coolant temperature sender -G62 - → Chapter.

Analysis: Display group 000, display field 3 - engine speed (idling speed)

Display -V.A.G 1552-	Possible cause of fault	Rectifying fault
below 20 or 23	t  Throttle valve control unit -J338- blocks or is defective	–  Inspecting throttle valve control unit -J338- → Chapter.
above 24 or 27	t  Throttle valve control unit -J338- blocks or is defective t  large unmetered air volume (cannot be compensated (equalised) by idle stabilizer)	–  Inspecting throttle valve control unit -J338- → Chapter. –  Test intake system for leaks → Chapter.

Analysis: Display group 000, display field 4 - Vehicle voltage

Display -V.A.G 1552-	Possible cause of fault	Rectifying fault
less than 120	t  AC generator defective, battery heavily discharged t  Battery heavily loaded just after start by a high charge current or by auxiliary equipment t  Transition resistance in the power supply or earth connection for engine control unit t  Current consumption with ignition off	–  Check voltage, charge battery → Electrical System; Rep. Gr. 27. –  Increase engine speed slightly for a few minutes and switch off additional consumers. –  Check the supply voltage of the engine control unit → Chapter. –  Rectify any current drain.
above 144	t  Voltage regulator on AC generator defective t  Overvoltage due to starting aid or quick charger	–  Check the AC generator → Electrical system; Rep. Gr.27. –  Interrogate the fault memory → Chapter.

Analysis: Display group 000, display field 5 - Throttle valve angle

Display -V.A.G 1552-	Possible cause of fault	Rectifying fault
below 2 or 3	t  Throttle valve potentiometer or throttle valve control unit -J338- defective or incorrectly set t  Unmetered air between the intake manifold and the air filter (results in higher idling speed as the throttle valve control unit attempts to reduce the increased idling speed to the nominal idling speed)	–  Inspecting throttle valve control unit -J338- → Chapter. –  Test intake system for leaks → Chapter.
above 10 or 12	t  Adaptation of the throttle valve control unit -J338 - not carried out t  Throttle valve potentiometer or throttle valve control unit -J338- defective or incorrectly set t  Throttle valve jams	–  Perform adaptation of the throttle valve control unit -J338- → Chapter. –  Inspecting throttle valve control unit -J338- → Chapter.

Analysis: Display group 000, display field 6 - idling regulator

Display -V.A.G 1552-	Possible cause of fault	Rectifying fault
below 100 above 155	Throttle valve potentiometer or throttle valve control unit -J338- defective or incorrectly set	–  Inspecting throttle valve control unit -J338- → Chapter. –  Perform adaptation of the throttle valve control unit -J338- → Chapter.

Display group 001 in idle

Reading measured value block 1			→	< Readout on display
xxx rpm	xxx.x °C	xx.x %	xxxxxxxx
1	2	3	4	< Display field	Specification	Analysis
				Setting condition for basic setting	1x111111	→ Anchor
			Lambda control before catalyst		-10,0…+10,0 %	→ Anchor
		Coolant temperature			80.0…115.0 °C	---
	Engine speed (idling speed) 1.0 ltr. engine 1.4 ltr. engine				630...770 rpm 730...870 rpm	---

Analysis of display group 001, display field 3 - lambda control upstream of catalytic converter

Display -V.A.G 1552-	Possible cause of fault	Rectifying fault
outside the tolerance range	Minimum range: Air-fuel mixture too rich, the lambda control leans the mixture Plus range: Air-fuel mixture too lean, lambda control enriches	–  Wait 30 seconds until readout has stabilised.
	Unmetered air	–  Test intake system for leaks → Chapter.
	Injection valve defective	–  Testing injection valves → Chapter.

Analysis: Display group 001, display field 4 - Setting condition for basic setting

Meaning, if display positions = 1
X	X	X	X	X	X	X	X	Operating position
1								No fault detected in self-diagnosis
	1							Disregard display
		1						Air conditioning compressor off
			1					Operating state - idling
				1				Lambda control: o.k.
					1			Throttle valve shut
						1		Speed below 2000 rpm
							1	Coolant temperature more than 80°C

Display group 002 in idle

Reading measured value block 2			→	< Readout on display
xxx rpm	xxx.x %	x.x ms	xxx mbar
1	2	3	4	< Display field	Specification	Analysis
				Disregard display	---	---
			average injection period		2.0…5.5 ms	→ Anchor
		Disregard display			---	---
	Engine speed (idling speed) 1.0 ltr. engine 1.4 ltr. engine				630...770 rpm 730...870 rpm	---

Analysis: Display group 002, display field 3 - injection time

Display -V.A.G 1552-	Possible cause of fault	Rectifying fault
less than 2.0 ms	t  high fuel volume from the activated charcoal filter system t  Incorrect injection valve with too great flow rate fitted	–  Testing Activated charcoal filter system solenoid valve 1 -N80- → Chapter. –  Testing injection valves → Chapter.
above 5.5 ms	t  increased engine load due to electrical consumers (air conditioning system, fog lights etc.)	–  Eliminate increased load (AC, fog lights etc.).

Display group 003 in idle

Reading measured value block 3			→	< Readout on display
xxx rpm	xxx mbar	x.x %	xx.x ° b. TDC
1	2	3	4	< Display field	Specification	Analysis
				Ignition angle (actual value)	2.0°a. TDC... 13.0°b. TDC	---
			Throttle valve angle 1.0 ltr. engine 1.4 ltr. engine		1,0…5,0 % 1,5…6,0 %	---
		Intake manifold pressure 1,0 l ltr. engine 1.4 ltr. engine			300...550 mbar 350...600 mbar	---
	Engine speed (idling speed) 1.0 ltr. engine 1.4 ltr. engine				630...770 rpm 730...870 rpm	---

Display group 004 in idle

Reading measured value block 4			→	< Readout on display
xxx rpm	xx.x V	xxx.x °C	xxx.x °C
1	2	3	4	< Display field	Specification	Analysis
				Intake manifold temperature	-45,0…105 °C	---
			Coolant temperature		80.0…115.0 °C	---
		Supply voltage of the engine control unit			12,5…14,5 V	---
	Engine speed (idling speed) 1.0 ltr. engine 1.4 ltr. engine				630...770 rpm 730...870 rpm	---

Display group 005 in idle

Reading measured value block 5			→	< Readout on display
xxx rpm	xxx.x %	xxx km/h	Text
1	2	3	4	< Display field	Specification	Analysis
				Operating condition (idling, enrichment, partial load, full load, trailing throttle)	Idling	---
			Vehicle speed		0 km/h	---
		Disregard display			---	---
	Engine speed (idling speed) 1.0 ltr. engine 1.4 ltr. engine				630...770 rpm 730...870 rpm	---

Display group 011 in idle

Reading measured value block 11			→	< Readout on display
xxx rpm	xxx.x °C	xxx.x °C	xx.x ° b. TDC
1	2	3	4	< Display field	Specification	Analysis
				Ignition angle (actual value)	2.0°a. TDC... 13.0°b. TDC	---
			Intake manifold temperature		-45,0…105 °C	---
		Coolant temperature			80.0…115.0 °C	---
	Engine speed (idling speed) 1.0 ltr. engine 1.4 ltr. engine				630...770 rpm 730...870 rpm	---

Display group 012 in idle

Reading measured value block 12			→	< Readout on display
xxx rpm	xxx %	xx	xx
1	2	3	4	< Display field	Specification	Analysis
				No. of the crankshaft gear for camshaft pressure change high - low 1)	85…91	---
			No. of the crankshaft gear for camshaft pressure change low - high 1)		25…31	---
		Disregard display			---	---
	Engine speed (idling speed) 1.0 ltr. engine 1.4 ltr. engine				630...770 rpm 730...870 rpm	---

1)If the value is outside the tolerance and if fault 16725 or 17748 has been stored in the fault memory, the voltage of the timing chain must be checked (on engines with high mileage).

Display group 014 - Ignition, sum of ignition misfiring for engines with identification characters ATZ, AQW, AZF l  Driving

Read measured value block 14 →				⇐ Read out on display:
xxxx rpm	xxx %	xxx	Text
1	2	3	4	⇐ Display field	Specification	Analysis:
				Combustion misfiring detection (activated, deactivated)	activated	—
			Sum of ignition misfiring		max. 10	→ Anchor
		Engine load			12…100 %	—
	Engine speed (idling speed) 1.0 ltr. engine 1.4 ltr. engine				630...770 rpm 730...870 rpm	---

Analysis of display group 014, sum of ignition misfiring

Display field	Readout on display:	Possible cause of fault	Rectifying fault
3	above 10	t  Spark plug defective t  Ignition terminal defective	–  Inspect spark plugs → Chapter –  Inspecting ignition terminal → Chapter
		t  Injection valve defective	–  Testing injection valves → Chapter.

Display group 014 - Ignition, cylinder misfiring 1 to 3 for engines with identification characters ATZ, AQW, AZF l  Driving

Read measured value block 15 →				⇐ Read out on display:
xxx	xxx	xxx	Text
1	2	3	4	⇐ Display field	Specification	Analysis:
				Combustion misfiring detection (activated, deactivated)	activated	—
			Ignition misfiring cylinder 3		0	→ Anchor
		Ignition misfiring cylinder 2			0	→ Anchor
	Ignition misfiring cylinder 1				0	→ Anchor

Display group 016 - Ignition, cylinder misfiring 4 for engines with identification characters ATZ, AQW, AZF l  Driving

Read measured value block 16 →				⇐ Read out on display:
xxx	—	—	Text
1	2	3	4	⇐ Display field	Specification	Analysis:
				Combustion misfiring detection (activated, deactivated)	activated	—
					—	—
					—	—
	Ignition misfiring cylinder 4				0	→ Anchor

Analysis of display groups 015 and 016, ignition misfiring cyl. 1 through cyl. 4

Display fields	Readout on display:	Possible cause of fault	Rectifying fault
Display group 15 display field 1 to 3	above 0	t  Spark plug defective t  Ignition terminal defective	–  Inspect spark plugs → Chapter –  Inspecting ignition terminal → Chapter
and display group 16 display field 1		t  Injection valve defective	–  Testing injection valves → Chapter.

Display group 020 in idle

Reading measured value block 20			→	< Readout on display
xx.x  ° b.TDC	xx.x  ° b.TDC	xx.x  ° b.TDC	xx.x  ° b.TDC
1	2	3	4	< Display field	Specification	Analysis
				Ignition angle relief cyl. 4	0…15.0 ° b.TDC	→ Anchor
			Ignition angle relief cyl. 3		0…15.0 ° b.TDC	→ Anchor
		Ignition angle relief cyl. 2			0…15.0 ° b.TDC	→ Anchor
	Ignition angle relief cyl. 1				0…15.0 ° b.TDC	→ Anchor

Analysis: Display group 020, display fields 1 through 4 - Ignition angle relief

Display -V.A.G 1552-	Possible cause of fault	Rectifying fault
all cylinders above 15° b. TDC	t  Knock sensor 1 -G61- defective	–  Check knock sensor 1 -G61- → Chapter.
	t  Plug connection at knock sensor -G61- corroded	–  Slacken knock sensor -G61- and tighten to 20 Nm.
	t  Component parts on engine loose	–  Tighten attached parts.
	t  poor fuel quality	–  Change grade of fuel.
one cylinder clearly deviates from the others	t  Plug connection at knock sensor -G61- corroded	–  Check knock sensor 1 - G61- → Chapter.
	t  Engine damage	–  Testing compression pressure → 1.0/37; 1.4/44; 1.4/50 Engine -Mechanics; Rep. Gr.15.
	t  Component parts on engine loose	–  Tighten attached parts.

Display group 026 in idle

Reading measured value block 26			→	< Readout on display
x.xxx V	x.xxx V	x.xxx V	x.xxx V
1	2	3	4	< Display field	Specification	Analysis
				Knock sensor voltage signal cyl. 4	0.2…2.0 V	---
			Knock sensor voltage signal cyl. 3		0.2…2.0 V	---
		Knock sensor voltage signal cyl. 2			0.2…2.0 V	---
	Knock sensor voltage signal cyl. 1				0.2…2.0 V	---

Display group 028, engine idling

Reading measured value block 28			→	< Readout on display
xxx rpm	xxx %	xxx.x °C	Text
1	2	3	4	< Display field	Specification	Analysis
				Result knock control (Test ON / Test OFF / Syst. O.K. / Syst. N.O.K.)	Sys. O.K.	---
			Coolant temperature		80.0…115.0 °C	---
		Disregard display			---	---
	Engine speed (idling speed) 1.0 ltr. engine 1.4 ltr. engine				630...770 rpm 730...870 rpm	---