Skoda Workshop Service and Repair Manuals

Read measured value block; display groups 000 to 010 Display group 000 (display values in decimals) l  Engine runs in idle (coolant temperature not below 80 °C) l  All electrical components switched off

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

Display- nominal value

Corresponds to measured value

Initialisation value of the fuel preparation - under partial load

110 to 145

-7 to +7 %

Initialisation value of the fuel preparation - when idling

125 to 131

-2,25 to +3 ms

Control value of the fuel preparation

100 to 155

-11 to +11 %

Initialisation value idle stabilizer

101 to 154

-10 to +10 %

Idling regulator

100 to 155

-11 to +11 %

Throttle valve angle

4 to 12

2 to 6°

Battery voltage

110 to 150

11 to 15 V

Engine speed (idling speed)

23 to 27

730 to 870 min-1

Disregard display

255

---

Coolant temperature

164 to 201

75 to 103 °C

Analysis of display group 000

Display field: 1 coolant temperature
Readout on -V.A.G 1552-	Possible cause of fault	Rectifying fault
less than 164	t  Engine too cold t  Coolant temperature sender or cable connection to engine control unit	–  Conduct road test if necessary. –  Coolant temperature sender -G62- → Chapter.
greater than 201	t  Radiator dirty t  Radiator fan not operational t  Coolant regulator (thermostat) defective t  Coolant temperature sender or cable connection to engine control unit	–  Clean radiator –  Test function of the radiator fan. –  Inspect coolant regulator (thermostat). –  Coolant temperature sender -G62 - → Chapter.

Display field: 3 engine speed (idling speed)
Readout on -V.A.G 1552-	Possible cause of fault	Rectifying fault
less than 23	t  Throttle valve control unit -J338- jamming or faulty	–  Inspecting throttle valve control unit → Chapter.
greater than 27	t  Throttle valve control unit -J338- jamming or faulty t  large unmetered air volume (cannot be compensated (equalised) by idle stabilizer)	–  Inspecting throttle valve control unit → Chapter. –  Eliminate unmetered air.

Display field: 4 battery voltage
Readout on -V.A.G 1552-	Possible cause of fault	Rectifying fault
less than 110	t  Generator defective, battery 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	–  Test voltage, recharge battery. –  Briefly increase engine speed slightly and switch off auxiliary equipment. –  Check voltage supply of the control unit → Chapter. –  Rectify any current drain.
greater than 150	t  Voltage regulator on AC generator defective t  Overvoltage due to starting aid or quick charger	–  Test voltage, replace voltage regulator if necessary. –  Interrogating fault memory → Chapter

Display field: 5 throttle valve angle
Readout on -V.A.G 1552-	Possible cause of fault	Rectifying fault
less than 4	t  Throttle valve potentiometer in the throttle valve control unit -J338- defective or incorrectly set t  Unmetered air between the intake manifold and the air mass meter (results in a higher idling speed; the throttle valve control unit attempts to adjust the increased idling speed to the nominal idling speed)	–  Inspecting throttle valve control unit -J338- → Chapter. –  Eliminate cause of unmetered air.
greater than 12	t  Adaptation of the throttle valve control unit not carried out -J338- t  Throttle valve potentiometer in the throttle valve control unit -J338- defective or incorrectly set t  Throttle valve jams	–  Carry out → Chapter adaptation of the throttle valve control unit -J338-. –  Inspecting throttle valve control unit -J338- → Chapter.

Display field: 6 idling regulator
Readout on -V.A.G 1552-	Possible cause of fault	Rectifying fault
less than 100 greater than 155	t  Throttle valve potentiometer in the throttle valve control unit -J338- defective or incorrectly set	–  Inspecting throttle valve control unit -J338- → Chapter. –  Carry out → Chapter adaptation of the throttle valve control unit -J338 -.

Display group 001 - Basic functions:

Reading measured value block 1			→	< Readout on display
730...870 /min.	75...105 °C	-10,0...10,0 %	xxxxxxxx
				Setting condition for basic setting
			Lambda control value
		Coolant temperature
	Engine speed (idling speed)

Note t  Re display field 4: t  Meaning of the digits in the 8-digit numerical block for the setting condition of the throttle valve adjustment: t  1 = Condition fulfilled t  0 = Condition not fulfilled

X	X	X	X	X	X	X	X	Meaning, if display positions = 1
1								No fault detected in self-diagnosis
	1							Ignore
		1						Air conditioning compressor off (always “1”)
			1					Idling switch closed
				1				Lambda control o.k.
					1			Throttle valve shut
						1		Engine speed below 2000 rpm -1
							1	Coolant temperature minimum 80°C

Display group 002 - Basic functions:

Reading measured value block 2			→	< Readout on display
xxx rpm	xxx.x %	2...5,5 ms	xxx mbar (g/s)
				Ignore
			average injection period
		Ignore
	Idling speed → Anchor

Display group 003 - Basic functions:

Reading measured value block 3			→	< Readout on display
xxx rpm	xxx mbar (g/s)	x.x % (∠°)	0...12 ° b. TDC
				Ignition angle (actual value)
			Ignore
		Ignore
	Idling speed → Anchor

Display group 004 - Basic functions:

Reading measured value block 4			→	< Readout on display
xxx rpm	11...15 V	75...105 °C	-45...105 °C
				Intake manifold temperature
			Coolant temperature
		Supply voltage of the engine control unit
	Idling speed → Anchor

Display group 005 - Basic functions:

Reading measured value block 5			→	< Readout on display
xxx rpm	xxx %	0 km/h	Text
				Operating condition (idling, enrichment, partial load, full load, overrun fuel cut-off)
			Driving speed
		Ignore
	Idling speed → Anchor