Volkswagen Workshop Service and Repair Manuals > Golf Mk3 > Power unit | Motronic injection and ignition system from 08.95 | Self diagnosis, V.A.G Inspection Service | Self diagnosis

Final control diagnosis > < Reading-out readiness code

Motronic injection and ignition system from 08.95

Self diagnosis

Generating readiness code

Special tools, testers and auxiliary items

◆ Fault reader V.A.G 1551 (or vehicle system tester V.A.G 1552) with cable V.A.G 1551/3

Notes:

◆ During the test sequence the engine must not be switched off.
◆ If the specifications are attained before the time limit expires, the test sequence can be advanced.
◆ On vehicles ▸Model year 96 the Bits in readiness code are set to 0 together, when the last diagnosis has been successfully completed.
◆ On vehiclesModel year 97▸the Bits in readiness code are set to 0 individually, for each successfully completed diagnosis.

Test sequence

Work step: 1

‒ Connect fault reader V.A.G 1551 (V.A.G 1552) and select engine electronics control unit with the "Address word" 01. When doing this the ignition must be switched on.
(Connecting fault reader and selecting engine electronics control unit .)

Relevance of 8 digit number block in display zone 4


Relevance if display 1
1	2	3	4	5	6	7	8	Diagnosis conditions
							1	FAULT = Bit in fault memory
						1		ERROR-Bit = Fault detected in diagnosis
					1			CYCLE Bit = Diagnosis completed
				1				ACTIVE Bit = Diagnosis currently active
			x					Function Bit 1)
		x						Function Bit 1)
	x							Function Bit 1)
x								Function Bit 1)

1) The relevance of the Function Bit varies depending upon the work step.

Notes:

◆ There must not be a fault entered in fault memory and also no fault detected during this diagnosis.
◆ If the CYCLE bit has a 1, the diagnosis is completed and the test sequence can be implemented.
◆ The specifications for the function bits must only be satisfied during the diagnosis phase (ACTIVE bit = 1).
◆ An x as specification in diagnosis status table means: Display can show either 0 or 1.

Work step: 2

→ Indicated on display:

Rapid data transfer HELP

Select function XX

‒ Press keys 0 and 2 for function "Interrogate fault memory" and confirm entry with Q key.

→ The number of faults stored or "No fault recognised!" will be shown on the display.

X Faults recognised!

‒ Locate and eliminate faults printed out as per fault table => Page 01-13 .
‒ Press ⇒key.

Work step: 3

→ Indicated on display:

Rapid data transfer HELP

Select function XX

‒ Press keys 0 and 5 for the function "Erase fault memory" and confirm entry with Q key.

→ Indicated on display:

Rapid data transfer ⇒

Fault memory is erased!

‒ Press ⇒key.

Work step: 4

‒ Start engine and run at idling speed.

Work step: 5

→ Indicated on display:

Rapid data transfer HELP

Select function XX

‒ Press keys 0 and 8 for the function "Read measured value block" and confirm entry with Q key.

→ Indicated on display:

Read measured value block HELP

Input display group number XXX

‒ Press keys 1, 0 and 3 for the "Display group number 103" and confirm entry with Q key.

→ Indicated on display:
(1...4 = Display zones)

Read measured value block 103 ⇒

1 2 3 4

‒ Increase engine speed to 3000...3500 rpm and check specifications after 60 seconds:


	Display zones
	1	2	3	4
Display group 103
Display	xx.xx ms	xxx.x °C	xxx.x °C	xxxx xxxx
Indicated	Engine load	Coolant temperature	Exhaust gas temperature	Diagnosis conditions
Specification	---	At least 40 °C	At least 360 °C	xx1x xx00
Working range	1.4...2.4 ms	-46.5...141.0 °C	0.0...999.9 °C	x = Not relevant


Relevance of 8 digit number block in display zone 4
1	2	3	4	5	6	7	8	Specifications of diagnosis conditions
		1						Lambda control active
						0		Diagnosis fault free
							0	Fault memory fault free

‒ Press C key.

Work step: 6

→ Indicated on display:

Read measured value block HELP

Input display group number XXX

‒ Press keys 1, 0 and 3 for the "Display group number 103" and confirm entry with Q key.

→ Indicated on display:
(1...4 = Display zones)

Read measured value block 103 ⇒

1 2 3 4

‒ Increase engine speed to 2200...3300 rpm and check specifications after 120 seconds:


	Display zones
	1	2	3	4
Display group 103
Display	xx.xx ms	xxx.x °C	xxx.x °C	xxxx xxxx
Indicated	Engine load	Coolant temperature	Exhaust gas temperature	Diagnosis conditions
Specification		At least 60 °C	At least 360°C	xx1x xx00
	---		---	x = Not relevant
Working range	1.4...2.4 ms	-46.5...141.0 °C	0.0...999.9 °C


Relevance of 8 digit number block in display zone 4
1	2	3	4	5	6	7	8	Specifications of diagnosis conditions
		1						Lambda control active
						0		Diagnosis fault free
							0	Fault memory fault free

‒ Press ⇒key.

Work step: 7

Diagnosis: Lambda probe ageing (regulating frequency extended)

→ Indicated on display:

Rapid data transfer HELP

Select function XX

‒ Press keys 0 and 4 for the "Introduce basic setting" function and confirm entry with Q key.

→ Indicated on display:

Introduce basic setting HELP

Input display group number XX

‒ Press keys 1, 3 and 1 for the "Display group number 131" and confirm entry with Q key.

→ Indicated on display:
(1...4 = Display zones)

Basic setting 131 ⇒

1 2 3 4

‒ Allow the engine to idle for at least 5 seconds and then check the specifications:


	Display zones
	1	2	3	4
Display group 131
Display	xxxx rpm	x.xxx V	xxxx ms	xxxx xxxx
Indicated	Engine speed	Voltage of probe after catalyst	Probe aging	Diagnosis conditions
Specification	800...880 rpm	0.01...1.00 V fluctuating	- 1200...1200 ms	xxxx x100
	---		Probe ageing: TV displacement by Lambda control after catalyst	x = Not relevant
Working range	800...6000 rpm	0.01...1.00 V	-1200...1200 ms


Relevance of 8 digit number block in display zone 4
1	2	3	4	5	6	7	8	Specifications of diagnosis conditions
		1						Lambda control after catalyst active
			1					Lambda control before catalyst active
					1			CYCLE Bit = Diagnosis completed
						0		Diagnosis fault free
							0	Fault memory fault free

‒ Press C key.

Work step: 8

Diagnosis: Lambda adaption in part load range

→ Indicated on display:

Introduce basic setting HELP

Input display group number XX

‒ Press keys 1, 2 and 5 for the "Display group number 125" and confirm entry with Q key.

→ Indicated on display:
(1...4 = Display zones)

Basic setting 125 ⇒

1 2 3 4

Note:

Avoid overrun phases before this diagnosis, as then the catalyst stores lots of oxygen and the diagnosis will be blocked for at least 10 seconds.

‒ Carry out test drive and when doing this

‒ Driving range 2 or 2nd gear must be selected.
‒ The revolutions must be kept between 2500...3500 rpm.
‒ Continue test drive until the specifications are attained.

‒ Check the specifications during the test drive
(2nd person necessary):


	Display zones
	1	2	3	4
Display group 125
Display	xxxx rpm	x.x %	x.x %	xxxx xxxx
Indicated	Engine speed	Lambda adaption at part load	Lambda adaption at idling	Diagnosis conditions
Specification	2500...3500 rpm	-10...10 %	-12.4...12.4 %	01x1 x100
	Depending upon driving condition			x = Not relevant
Working range	800...6000 rpm	-23...23 %	-12.4...12.4 %


Relevance of 8 digit number block in display zone 4
1	2	3	4	5	6	7	8	Specifications of diagnosis conditions
0								Reduced correction range active
	1							Part load adaption active
			1					Lambda control before catalyst active
					1			CYCLE Bit = Diagnosis completed
						0		Diagnosis fault free
							0	Fault memory fault free

Work step: 9

Diagnosis: Lambda adaption in idling range

Test conditions

● Coolant temperature min. 60 °C
(=>Display group 001, display zone 2)
● Intake manifold temperature max. 80 °C
(=>Display group 003, display zone 4)

→ Indicated on display:
(1...4 = Display zones)

Basic setting 125 ⇒

1 2 3 4

‒ Run engine at idling speed and check specifications after 30 seconds:


	Display zones
	1	2	3	4
Display group 125
Display	xxxx rpm	x.x %	x.x %	xxxx xxxx
Indicated	Engine speed	Lambda adaption at part load	Lambda adaption at idling	Diagnosis conditions
Specification	800...880 rpm	-23...23 %	-12.4...12.4 %	01x1 x100
				x = Not relevant
Working range	8000...6000 rpm	-23...23 %	-12.4...12.4 %


Relevance of 8 digit number block in display zone 4
1	2	3	4	5	6	7	8	Specifications of diagnosis conditions
0								Reduced correction range active
	1							Part load adaption active
			1					Lambda control before catalyst active
					1			CYCLE Bit = Diagnosis completed
						0		Diagnosis fault free
							0	Fault memory fault free

‒ Press C key.

Work step: 10

Diagnosis: Lambda probe ageing (regulating frequency extended)

Test conditions

● Vehicle stationary

→ Indicated on display:

Introduce basic setting HELP

Input display group number XX

‒ Press keys 1, 3 and 0 for "Display group number 130" and confirm entry with Q key.

→ Indicated on display:
(1...4 = Display zones)

Basic setting 130 ⇒

1 2 3 4

‒ Increase engine speed to 2200...2800 rpm for 20 seconds and check the specifications:


	Display zones
	1	2	3	4
Display group 130
Display	xxxx rpm	xx s	x	xxxx xxxx
Indicated	Engine speed	Seconds	Period counter	Diagnosis conditions
Specific.	2200...2800 rpm	0...2.8 s	4	1111 x100
		Period duration of Lambda control before catalyst	Lambda probe periods recognised
Working range	800...6000 rpm	0.00...15.00 s	0...4	---


Relevance of 8 digit number block in display zone 4
1	2	3	4	5	6	7	8	Specifications of diagnosis conditions
1								Lambda control before catalyst active
	1							Speed/load range OK.
		1						Catalyst has its minimum temperature
			1					Probe heating before cat. diagnosis comp.
					1			CYCLE Bit = Diagnosis completed
						0		Diagnosis fault free
							0	Fault memory fault free

‒ Press C key.

Work step: 11

Diagnosis: Catalyst

→ Indicated on display:

Introduce basic setting HELP

Input display group number XX

‒ Press keys 1, 3 and 6 for "Display group number 136" and confirm entry with Q key.

→ Indicated on display:
(1...4 = Display zones)

Basic setting 136 ⇒

1 2 3 4

‒ Increase engine speed to 2700...3300 rpm and check specifications after 120 seconds:


	Display zones
	1	2	3	4
Display group 136
Display	xxxx rpm	xxx.x °C	x.xx	xxxx xxxx
Indicated	Engine speed	Exhaust gas temperature	Amplitude ratio	Diagnosis conditions
Specification	2700...3300 rpm	At least 360 °C	max. 0.3	1111 x100
				x = Not relevant
Working range	800...6000 rpm	0.0...999.9°C


Relevance of 8 digit number block in display zone 4
1	2	3	4	5	6	7	8	Specifications of diagnosis conditions
1								Lambda control before catalyst active
	1							Catalyst has its minimum temperature
		1						Load range OK.
			1					Lambda probe after cat. operationally ready
					1			CYCLE Bit = Diagnosis completed
						0		Diagnosis fault free
							0	Fault memory fault free

‒ Press C key.

Work step: 12

Diagnosis: Tank venting system

Test conditions

● Vehicle stationary
● Electrical consumers switched off (radiator fan must not run during the check)
● Air conditioner switched off

Note:

The engine must not be loaded during this diagnosis because the diagnosis will be interrupted and will not be started again until the engine is revved-up.

→ Indicated on display:

Introduce basic setting HELP

Input display group number XX

‒ Press keys 1, 5 and 0 for the "Display group number 150" and confirm entry with Q key.

→ Indicated on display:
(1...4 = Display zones)

Basic setting 150 ⇒

1 2 3 4

‒ Run engine for 30 seconds at idling speed and check specifications:


	Display zones
	1	2	3	4
Display group 150
Display	xx %	x.x %	x.xx g/s	xxxx xxxx
Indicated	Opening degrees	Probes control	Idling control	Diagnosis conditions
Specification	0...100 %	-7.8...-23 or 7.8...23 or at least 0.20 g/s		1110 x100
	Minimum opening of the tank vent valve	Lambda control deviations during diagnosis	Lambda control deviations during diagnosis	x = Not relevant
Working range	0...100 %	-25...25


Relevance of 8 digit number block in display zone 4
1	2	3	4	5	6	7	8	Specifications of diagnosis conditions
1								Lambda control before catalyst active
	1							Idling
		1						Starting temperature warmer than -5 °C
			0					Altitude up to max. 2600 m above sea level
					1			CYCLE Bit = Diagnosis completed
						0		Diagnosis fault free
							0	Fault memory fault free

‒ Press ⇒key.

Work step: 13

‒ Read-out the readiness code=> Page 01-32
‒ If the readiness code is still not OK., carry out work steps 14...20.

Work step: 14

Diagnosis: Road speed sender

→ Indicated on display:

Rapid data transfer HELP

Select function XX

‒ Press keys 0 and 4 for the "Introduction of basic setting" function and confirm entry with Q key.

→ Indicated on display:

Introduce basic setting HELP

Input display group number XX

‒ Press keys 1, 8 and 0 for "Display group number 180" and confirm entry with Q key.

→ Indicated on display:
(1...4 = Display zones)

Basic setting 180 ⇒

1 2 3 4

‒ Carry out a test drive and when doing this

‒ Driving range 2 or 2nd gear must be selected,
‒ The engine speed must be above 3200...4000 rpm for 10 seconds,

then

‒ Release accelerator pedal for 3 seconds (after the 3 seconds the driving speed must still be at least 20 km/h and have been in overrun for a minimum of 2 secs.).

Check the specifications during the test drive
(2nd person necessary):


	Display zones
	1	2	3	4
Display group 180
Display	xxxx rpm	xxx.x°C	km/h	xxxx xxxx
Indicated	Engine speed	Coolant temperature	Vehicle speed	Diagnosis conditions
Specification	10 seconds between 3200...4000 rpm	At least 80 °C	25...50 km/h	x111 x100
				x = Not relevant
Working range	800...6000 rpm	-46.5...141.0 °C


Relevance of 8 digit number block in display zone 4
1	2	3	4	5	6	7	8	Specifications of diagnosis conditions
	1							Engine speed for this check is OK.
		1						Coolant temperature OK.
			1					Overrun cut-off is active
					1			CYCLE Bit = Diagnosis completed
						0		Diagnosis fault free
							0	Fault memory fault free

‒ Press C key.

Work step: 15

Diagnosis: Knock sensor

Test conditions

● Vehicle stationary

→ Indicated on display:

Introduce basic setting HELP

Input display group number XX

‒ Press keys 1, 4 and 5 for "Display group number 145" and confirm entry with Q key.

→ Indicated on display:
(1...4 = Display zones)

Basic setting 145 ⇒

1 2 3 4

‒ Increase engine speed to at least 2500 rpm and check specifications after 15 seconds:


	Display zones
	1	2	3	4
Display group 145
Display	xxxx rpm	x	x	xxxx xxxx
Indicated	Engine speed	Knock sensor1	Wiring open circuit counter	Diagnosis conditions
Specification	At least 2500 rpm	max.7	0	xxxx 1100
		Amplification factor of knock sensor signal	Wiring open circuit diagnosed	x = Not relevant
Working range	800...6000 rpm


Relevance of 8 digit number block in display zone 4
1	2	3	4	5	6	7	8	Specifications of diagnosis conditions
				1				Knock sensor diagnosis is active
					1			CYCLE Bit = Diagnosis completed
						0		Diagnosis fault free
							0	Fault memory fault free

‒ Press C key.

Work step: 16

Diagnosis: Lambda probe before catalyst

→ Indicated on display:

Introduce basic setting HELP

Input display group number XX

‒ Press keys 1, 1 and 5 for "Display group number 115" and confirm entry with Q key.

→ Indicated on display:
(1...4 = Display zones)

Basic setting 115 ⇒

1 2 3 4

‒ Increase engine speed to 2200...2800 rpm and check the specifications:


	Display zones
	1	2	3	4
Display group 115
Display	xxx.x °C	xxx.x °C	x.xx V	xxxx xxxx
Indicated	Coolant temperature	Exhaust gas temperature	Lambda probe voltage before catalyst	Diagnosis conditions
Specific.	At least 60°C	Approx. 360 °C	Fluctuating	1011 x100
		---	---	x = Not relevant
Working range	-46.5...141.0 °C	0.0...999.9 °C	0...1.0 V


Relevance of 8 digit number block in display zone 4
1	2	3	4	5	6	7	8	Specifications of diagnosis conditions
1								Lambda probe before cat. is switched on
	0							Lambda probe is operationally warm
		1						Lambda probe bef. cat. is operationally ready
			1					Lambda control before cat. is active
					1			CYCLE Bit = Diagnosis completed
						0		Diagnosis fault free
							0	Fault memory fault free

‒ Press key 3 (V.A.G 1551) or key ↑(V.A.G 1552).

Work step: 17

Diagnosis: Lambda probe after catalyst

→ Indicated on display:
(1...4 = Display zones)

Basic setting 116 ⇒

1 2 3 4

‒ Increase engine speed to 2200...2800 rpm and check the specifications after 15 seconds:


	Display zones
	1	2	3	4
Display group 116
Display	xxxx ms	xxx.x °C	x.xx V	xxxx xxxx
Indicated	Switching time delay of Lambda probe after catalyst	Exhaust gas temperature	Lambda probe voltage after catalyst	Diagnosis conditions
Specific.	Approx. 1200 ms	At least 360 °C	At least 0.6 V	1011 xx 00
		---	---	x = Not relevant
Working range		0.0...999.9 °C	0...1.0 V


Relevance of 8 digit number block in display zone 4
1	2	3	4	5	6	7	8	Specifications of diagnosis conditions
1								Probe heating after cat. is switched on
	0							Lambda probe is operationally warm
		1						Lambda probe after cat. operationally ready
			1					Lambda control before catalyst is active
					1			CYCLE Bit = Diagnosis completed
						0		Diagnosis fault free
							0	Fault memory fault free

‒ Press C key.

Work step: 18

Diagnosis: Lambda probe heating before and after catalyst

→ Indicated on display:

Read measured value block HELP

Input display group number XXX

‒ Press keys 1, 2 and 0 for "Display group number 120" and confirm entry with Q key.

→ Indicated on display:
(1...4 = Display zones)

Basic setting 120 ⇒

1 2 3 4

‒ Increase engine speed to 2200...2800 rpm and check the specifications:


	Display zones
	1	2	3	4
Display group 120
Display	xxx.x°C	xxx s	xx.x ω	xxxx xxxx
Indicated	Exhaust gas temperature	Seconds	Resistance	Diagnosis conditions
Specific.	At least 360 °C	Approx. 151 s	5.9...24.2 ω	1111 x100
		Time between Lambda probe heating switching on and commencement of diagnosis	Resistance of probe heating before catalyst	x = Not relevant
Working range	0.0...999.9 °C	0.0...500 s	0.0...65.0 ω


Relevance of 8 digit number block in display zone 4
1	2	3	4	5	6	7	8	Specifications of diagnosis conditions
1								Probe heating before cat. switched on
	1							Probe bef. cat. vapourisation point exceeded
		1						Lambda probe bef. cat. operationally ready
			1					Probe heating bef. cat. operationally ready
					1			CYCLE Bit = Diagnosis completed
						0		Diagnosis fault free
							0	Fault memory fault free

‒ Press key 3 (V.A.G 1551) or key ↑(V.A.G 1552).

→ Indicated on display:
(1...4 = Display zones)

Basic setting 121 ⇒

1 2 3 4

‒ Increase engine speed to 2200...2800 rpm and check specifications:


	Display zones
	1	2	3	4
Display group 121
Display	xxx.x°C	xxx s	xx.x ω	xxxx xxxx
Indicated	Exhaust gas temperature	Seconds	Resistance	Diagnosis conditions
Specific.	At least 360 °C	Approx. 151 s	5.9...24.2 ω	1111 x100
		Time between Lambda probe heating switching on and commencement of diagnosis	Resistance of probe heating after catalyst	x = Not relevant
Working range	0.0...999.9 °C	0.0...500 s	0.0...65.0 ω


Relevance of 8 digit number block in display zone 4
1	2	3	4	5	6	7	8	Specifications of diagnosis conditions
1								Probe heating after cat. switched on
	1							Probe after cat. vapourisation point exceeded
		1						Lambda probe after cat. operationally ready
			1					Probe heating after cat. operationally ready
					1			CYCLE Bit = Diagnosis completed
						0		Diagnosis fault free
							0	Fault memory fault free

‒ Press C key.

Work step: 19

Diagnosis: Throttle valve control part

Note:

There are no specifications for this diagnosis. The values in the display zones are typical for this diagnosis. If other values are shown it does not indicate a system fault. The diagnosis functions run in the background during the check.

‒ Press keys 1, 4 and 0 for "Display group number 140" and confirm entry with Q key.

→ Indicated on display:
(1...4 = Display zones)

Basic setting 140 ⇒

1 2 3 4

‒ Run engine at idling speed and check specifications:


	Display zones
	1	2	3	4
Display group 140
Display	x.xx ms	xx %	x.x V	xxxx xxxx
Indicated	Engine load	Idling actuator position	Throttle valve potentiometer voltage	Diagnosis conditions
Specification	1.4...2.4 ms	65...85 %	3.0...4.0 V	---

‒ Run engine at idling speed.
‒ Press key 3 (V.A.G 1551) or key ↑(V.A.G 1552).

→ Indicated on display:
(1...4 = Display zones)

Basic setting 141 ⇒

1 2 3 4

‒ Run engine at idling speed.


	Display zones
	1	2	3	4
Display group 141
Display	xx %	xxx %	xxx	xxxx xxxx
Indicated	Throttle valve actuator	Throttle valve actuator	Throttle valve actuator	Diagnosis conditions
Specification	65...85 %	65...85 %	90...170	---
	Actual position of throttle valve actuator	Throttle valve actuator specification	Throttle valve actuator integrator

‒ Press key 3 (V.A.G 1551) or key ↑(V.A.G 1552).

→ Indicated on display:
(1...4 = Display zones)

Basic setting 142 ⇒

1 2 3 4

‒ Run engine at idling speed.


	Display zones
	1	2	3	4
Display group 142
Display	xx %	xxx %	xxx	xxxx xxxx
Indicated	Throttle valve actuator	Throttle valve actuator	Throttle valve actuator	Diagnosis conditions
Specification	65...85 %	80...90 %	20...30 %	---
	Throttle valve actuator emergency running cross section	Throttle valve actuator minimum stop	Throttle valve actuator maximum stop

‒ Press ⇒key.

Work step: 20

‒ Read-out readiness code=> Page 01-32
‒ Press keys 0 and 6 for the "End output" function and confirm input with the Q key.

Power unit
Motronic injection and ignition system from 08.95 / Self diagnosis, V.A.G Inspection Service / Self diagnosis
Generating readiness code

Final control diagnosis > < Reading-out readiness code

Volkswagen Workshop Service and Repair Manuals

Golf Mk3

Power unit Motronic injection and ignition system from 08.95 / Self diagnosis, V.A.G Inspection Service / Self diagnosis Generating readiness code

Power unit Motronic injection and ignition system from 08.95 / Self diagnosis, V.A.G Inspection Service / Self diagnosis Generating readiness code

Power unit
Motronic injection and ignition system from 08.95 / Self diagnosis, V.A.G Inspection Service / Self diagnosis
Generating readiness code

Power unit
Motronic injection and ignition system from 08.95 / Self diagnosis, V.A.G Inspection Service / Self diagnosis
Generating readiness code