Skoda Workshop Service and Repair Manuals

Display groups 000...009 Display group 000 in idle (coolant temperature not below + 80°C):

Display field	Display nominal value	Corresponds to measured value	Identification
1	185...205 → Note 180...210	80...105°C → Note 80...110°C	Coolant temperature (Precondition for basic setting)
2	21...39 → Note 14...39	15...30 % → Note 10...30	Engine load (without consumers)
3	70...82 → Note 70...84 64...76	700...820 rpm → Note 700...840 rpm 640...760 rpm	Engine speed (without consumers) l  for vehicles with manual gearbox and four-wheel drive l  For models with an automatic gearbox
4	142...206	10...14.5 V	Battery voltage
5	1...7 → Note 1...10	0,4...2,75 % → Note 0,4...4,0 %	Throttle valve angle
6	106...189 → Note 106...189	-4.3...0 kg/h → Note -4.3...12.2 %	Control value of idling air mass (idling regulator) → Note load (moment) at idling speed
7	113...143	-3...+3 %	Initialisation value idling air mass
8	115...141	-10...+10 %	Control value of the fuel preparation (lambda control value) (if outside tolerance, perform test drive)
9	78...178	-10...+10 %	Initialisation value of the fuel preparation (lambda initialisation value) additive (if outside tolerance, perform test drive)
10	103...153	-10...+10 %	Initialisation value of the fuel preparation (lambda initialisation value) multiplicative (if outside tolerance, perform test drive)

1)  Values for engine with engine identification characters ARZ.   Note t  Regarding display fields 9 and 10: t  In the case of an additive initialisation value the injection period is changed by a fixed rate, which is independent of the basic injection period. t  The multiplicative learned value is a percentage change in the injection period, which is dependent on the basic injection period. Test table - Display group 000

Display field	Display -V.A.G 1552-	Fault cause	Rectifying fault
1	greater than 210 or 205	t  Coolant temperature sender -G62- faulty t  Fault in wiring to engine control unit	–  Test coolant temperature sender -G62-
	less than 180 or 185	t  Coolant temperature sender -G62- faulty t  Fault in wiring to engine control unit	–  Test coolant temperature sender -G62-
		t  Coolant regulator (thermostat) remains open	–  Testing coolant thermostat
2	greater than 39	t  Air conditioning switched on	–  Air conditioning switched off
		t  Electrical consumers on	–  Switch off el. consumers
		t  Lambda control on rich or lean load	–  Checking lambda control → Chapter
		t  AC compressor continues operating even though the air conditioning system is switched off	–  Inspecting AC compressor disconnection → Chapter
	less than 14 or 21	t  Unmetered air downstream of air-mass meter t  Unmetered air to throttle valve t  Vacuum hose released t  Fuel pressure regulator	–  Eliminate unmetered air
3	less than 70	t  Gear engaged (automatic gearbox)	–  Put selector lever in P or N
		t  Engine loaded by auxiliary equipment	–  Eliminate load (air conditioning, power steering etc.)
		t  Throttle valve control unit -J338- blocks or is defective	–  Inspecting throttle valve control unit -J338- → Chapter
	greater than 84 or 82	t  large unmetered air volume (cannot be compensated by idle stabilizer)	–  Eliminate unmetered air
		t  Throttle valve control unit -J338- blocks or is defective	–  Inspecting throttle valve control unit -J338- → Chapter
4	less than 142	t  Generator defective, battery heavily discharged	–  Test voltage, recharge battery
		t  Vehicle voltage heavily loaded just after start by a high charge current or by auxiliary equipment	–  Increase engine speed slightly for a few minutes and switch off additional consumers
		t  Transition resistance in the positive power supply or earth connection for engine control unit	–  Check the supply voltage of the engine control unit → Chapter
		t  Current consumption with ignition off	–  Eliminate current consumption
	greater than 206	t  Voltage regulator on AC generator defective	–  Test voltage, replace regulator if necessary
		t  Overvoltage due to starting aid or quick charger	–  Interrogating fault memory → Chapter
5	less than 1	t  not possible
	greater than 10 or 7	t  Basic setting of the throttle valve control unit not carried out t  Throttle valve potentiometer in throttle valve control unit faulty	–  Perform basic setting of the throttle valve control unit → Chapter. –  Interrogating fault memory → Chapter
		t  Throttle valve mechanism jams	–  Eliminate cause, if necessary replace
6	less than 106	t  Unmetered air to throttle valve	–  Eliminate unmetered air
	greater than 189	t  increased engine load due to auxiliary equipment	–  Eliminate load, switch off auxiliary equipment
7	less than 113	t  Unmetered air to throttle valve	–  Eliminate unmetered air
	greater than 143	t  increased engine load due to auxiliary equipment	–  eliminate load, switch off additional consumers
8	less than 115	t  Mixture too rich, lambda control leans off t  a lot of fuel from the activated charcoal filter (not in basic setting)	–  Press accelerator at 20 second intervals, until learning process is performed
		t  Vacuum hose for fuel pressure regulator leaks	–  Replace vacuum hose
		t  Lambda learned values on limit	–  Test lambda learned values, display group 008 → Chapter
	greater than 141	t  Mixture too lean, lambda control enriches	–  Testing injection rate → Chapter
		t  Unmetered air	–  Eliminate unmetered air
		t  Injection valves defective	–  Testing injection valves
		t  Lambda learned values on limit	–  Test lambda learned values, display group 008 → Chapter
	Display switches or remains contact at 128	t  Fuel level too low t  Lambda control goes into operation	–  At least 10 litres of fuel in the tank
9	less than 78 if necessary greater than 178		–  Display group 008, display field 2 and 3 → Chapter
10	less than 103 if necessary greater than 153		–  Display group 008, display field 2 and 3 → Chapter

Display group 001 - Basic functions: For engine with engine identification characters ARZ

l  Engine runs in idling speed
Read measured value block 1 →				⇐ Readout on display
xxxx rpm	xxx °C	xx %	xxxxxxxx
1	2	3	4	⇐ Display fields	Specification	Analysis
				Setting conditions for basic setting	1x111111	→ Anchor
			Lambda control before catalyst		-10...10 %	---
		Coolant temperature			80...110 °C	---
	Idling speed manual gearbox automatic gearbox				700...820 rpm 640...760 rpm	→ Anchor

Note t  Regarding display fields 1 and 3: t  When checking the intake system for leaks (unmetered air) the display fields for engine with engine identification characters ARX and AUM can also be used. Meaning of 8-digit numerical block:

Display field			Display -V.A.G 1552-								Meaning if readout number 1
4			1	2	3	4	5	6	7	8	Meaning
										1	Coolant temperature below 80°C
									1		Speed below 2000 rpm
								1			Throttle valve closed
							1				Lambda control o.k.
						1					Idling switch closed
					1						AC compressor disconnected
				1							No meaning
			1								No fault detected by self-diagnosis

Test table - Display group 001

Display field	Display -V.A.G 1552-	Fault cause	Rectifying fault
1	less than 640 rpm if necessary 700 rpm	t  Throttle valve control unit -J338- blocks or is defective	–  Inspecting throttle valve control unit -J338- → Chapter –  Performing idling test
	greater than 760 rpm if necessary 820 rpm	t  large unmetered air volume (cannot be compensated by idle stabilizer)	–  Interrogating fault memory → Chapter –  Inspect suction system for leaks → Chapter
		t  Throttle valve control unit -J338- blocks or is defective	–  Inspecting throttle valve control unit -J338- → Chapter –  Performing idling test

Display group 002 - Basic functions: Continued for all engines

l  Engine runs in idling speed
Read measured value block 2 →				⇐ Readout on display
xxxx rpm	xx.x %	x.x ms	x.x g/s
1	2	3	4	⇐ Display fields	Specification	Analysis
				Drawn in air mass	2...4.5 g/s	→ Anchor
			Injection time per working cycle		2,0...4,0 ms	→ Anchor
		Engine load			15,0...25,0 %	---
	Idling speed				---	→ Anchor

Note t  Re display field 4: t  The air mass measured by the air mass meter is displayed. Test table - Display group 002

Display field	Display -V.A.G 1552-	Fault cause	Rectifying fault
3	less than 2.0	t  high fuel volume from the activated charcoal filter system	–  Testing solenoid valve for activated charcoal filter
		t  incorrect injection valves with too great flow rate fitted	–  Testing injection rate → Chapter
	greater than 4.0	t  increased engine load due to electric consumers, air conditioning system, engaged driving position or power steering to the stop	–  Eliminate load
4	less than 2.0	t  large quantity of unmetered air between intake manifold and air mass meter	–  Eliminate unmetered air
	greater than 4,5	t  Gear engaged (automatic gearbox)	–  Put selector lever in P or N
		t  Engine loaded by auxiliary equipment	–  Eliminate load (air conditioning, power steering etc.)

Display group 003 - Basic functions: For engine with engine identification characters ARZ

l  Engine runs in idling speed
Read measured value block 3 →				⇐ Readout on display
xxxx rpm	x.x g/s	x.x %	xx ° b.TDC
1	2	3	4	⇐ Display fields	Specification	Analysis
				Ignition angle	6...12 °b TDC	---
			Throttle valve angle (potentiometer 1 -G187-)		0,2...4,0 %	---
		Drawn in air mass			2.0...4.5 g/s	---
	Idling speed				---	→ Anchor

Note t  Re display field 3: t  The readout when accelerator pedal fully depressed must be about 100%. Display group 004 - basic functions: Continued for all engines

l  Engine runs in idling speed
Read measured value block 4 →				⇐ Readout on display
xxxx rpm	xx.xxx V	xxx.x °C	xxx.x °C
1	2	3	4	⇐ Display fields	Specification	Analysis
				Intake manifold temperature	-48...110°C → Note -48...143.0°C	→ Anchor
			Coolant temperature		80.0...110.0°C	→ Anchor
		Supply voltage of the engine control unit			12.000...15.000 V	→ Anchor
	Idling speed				---	→ Anchor

2)  Valid for engine with engine identification characters ARZ   Note t  Re display field 3: t  As soon as the fault “coolant temperature sender” is stored in the fault memory, the engine control unit uses the intake air temperature as a replacement value to start the engine. The temperature then rises according to a model sequence stored in the control unit. If the engine is warm after a certain period a fixed replacement value is displayed. This fixed substitute value depends on the intake air temperature.   Note t  Re display field 4: t  The displayed value must correspond to the ambient temperature. t  If a functional problem arises at the intake air temperature sender - G42- or if there is a line interruption, the control unit functions with a replacement temperature of 19.5°C. t  Only use gilded contacts to repair contacts in the plug connection of the sender. Test table - Display group 004

Display field	Display -V.A.G 1552-	Fault cause	Rectifying fault
2	less than 12,0 V	t  Generator defective, battery heavily discharged	–  Test generator and battery voltage, charge battery
		t  Vehicle voltage heavily loaded just after start by a high charge current or by auxiliary equipment	–  Increase engine speed slightly for a few minutes and switch off additional consumers
		t  Transition resistance in the power supply or earth connection for engine control unit	–  Test voltage supply of engine control unit → Chapter
		t  Current consumption with ignition off	–  Eliminate current consumption
	greater than 15,0 V	t  Voltage regulator on AC generator defective	–  Test voltage, replace regulator if necessary
		t  Overvoltage due to starting aid or quick charger	–  Interrogating fault memory → Chapter
3	less than 80 °C	t  Engine too cold	–  Conduct test drive if necessary
		t  Coolant temperature sender or cable connection to engine control unit	–  Test coolant temperature sender -G62-
	greater than 110 °C	t  Radiator dirty	–  Clean radiator
		t  Radiator fan not operational	–  Check for proper operation
		t  Coolant regulator (thermostat) defective	–  Testing coolant thermostat
		t  Coolant temperature sender or cable connection to engine control unit	–  Test coolant temperature sender -G62-
	constant -48,0 °C	t  Line interruption	–  Test coolant temperature sender -G62-
	constant 143 °C	t  Short circuit between wires 3 and 4	–  Test coolant temperature sender -G62-
4	constant -48,0 °C	t  Line interruption	–  Interrogating fault memory → Chapter
	constant 143 °C	t  Short circuit between wires 1 and 2	–  Test sender - G42-

Display group 005 - Basic functions: Continued for all engines

l  Engine runs in idling speed
Read measured value block 5 →				⇐ Readout on display
xxxx rpm	xx %	x km/h	Text
1	2	3	4	⇐ Display fields	Specification	Analysis
				Operating condition (idling, partial load, enrichment, trailing throttle)	Idling	---
			Driving speed		0 km/h	---
		Engine load			15...25 %	---
	Idling speed				---	→ Anchor

Note t  Re display field 3: t  Make a test drive and observe the driving speed, nominal value: approx. driving speed. Display group 006 - Basic functions: For engine with engine identification characters ARZ

l  Engine runs in idling speed
Read measured value block 6 →				⇐ Readout on display
xxxx rpm	xx %	xxx %	xx.x %
1	2	3	4	⇐ Display fields	Specification	Analysis
				Level correction factor	-50,0...20 %	---
			Intake manifold temperature		-48...110 %	---
		Engine load			15...25 %	---
	Idling speed				---	→ Anchor

Note t  Re display field 3: t  The displayed value must correspond to the ambient temperature.