Volkswagen Workshop Service and Repair Manuals > Polo Mk3 > Power unit | 1AV fuel injection and ignition system (2-valve) | Self diagnosis, V.A.G Inspection Service | Self diagnosis

Final control diagnosis > < Interrogating and erasing fault memory

1AV fuel injection and ignition system (2-valve)

Self diagnosis

Fault table

Notes:

◆ The fault tables are listed according to the 5 digit fault code on the left.
◆ Explanation of the fault types (e.g. "open circuit/short circuit to earth"):

=> Fault reader operating instructions

◆ If components are indicated as faulty:
First check the wiring and connectors to these components as well as the system earth connections according to current flow diagram. This is particularly relevant if faults are output as "occurring sporadically" (SP).


V.A.G 1551 print-out		Possible causes of fault	Possible effects	Fault remedy
No fault recognized!		If a complaint exists: Fault not recognised during self-diagnosis	---	Continue fault finding according to fault table, in "Engine fault finding" binder.
00282
Throttle valve positioner -V601)
	Short to earth	- Short to earth - V60 defective/sticking in direction closed	- Cold starting problems - Cold idling problems - Hard load changes	- Check V60 , checking throttle valve control part
	Short to positive	- Short to positive - V60 defective/sticking in direction open	- Idling problems
	Open circuit	- Wiring open circuit
	Signal out of tolerance	- Short to earth and/or battery positive

1) The throttle valve positioner (V60) is a component of the throttle valve control part (J338).


V.A.G 1551 print-out		Possible causes of fault	Possible effects	Fault remedy
00516
Idling switch -F601)
	Unplausible signal	- F60 defective	- Idling problems - Driving characteristics faults when driving off	- Carry out basic setting , check throttle valve control part
00518
Throttle valve potentiometer -G692)
	Short to earth	- G69 defective - Wiring has short to earth	- Poor throttle response - Hard load changes	- Carry out basic setting
	Open circuit/Short to positive	- Wiring open circuit in earth cable - Wiring has short to positive - G69 defective	- Increased emission values - No full throttle recognition	- Check G69 , checking throttle valve control part

1) The idling speed switch (F60) is a component of the throttle valve control part (J338).

2) The throttle valve potentiometer (G69) is a component of the throttle valve control part (J338).


V.A.G 1551 print-out		Possible causes of fault	Possible effects	Fault remedy
00519
Intake manifold pipe pressure sender -G71
	Short to positive	- Wiring has short to positive	- Increased emissions values	- Check G71
	Open circuit/short to earth	- Wiring open circuit in earth cable - Wiring has short to earth - G71 defective	- Poor throttle response - Hard load changes
	Implausible signal	- Loose contact - G71 defective


V.A.G 1551 print-out		Possible causes of fault	Possible effects	Fault remedy
00522
Coolant temperature sender -G62
	Short to earth	- Wiring has short to earth - G62 defective	- Poor cold starting - Poor hot starting	- Check G62
	Open circuit/short to positive	- Wiring open circuit or short to positive - G62 defective	- No idling speed adaption - Increased emissions values
00523
Intake air temperature sender -G42
	Short to earth	- Wiring has short to earth - G42 defective	- Poor hot starting - Increased emissions values	- Check G42
	Open circuit/short to positive	- Wiring open circuit or short to positive - G42 defective


V.A.G 1551 print-out		Possible causes of fault	Possible effects	Fault remedy
00524
Knock sensor 1 -G61
	Signal too small	- Wiring open circuit or short to earth - G61 defective	- Ignition timing point has been retarded 15 < ° - Reduced output - High fuel consumption	- Check G61
00525
Lambda probe -G39
	Short to positive	- Wiring has short to positive - G39 defective	- No Lambda control	- Check Lambda probe and Lambda control
	Signal too large	- G39 defective
	Signal too small	- G39 defective - Wiring has short to earth


V.A.G 1551 print-out		Possible causes of fault	Possible effects	Fault remedy
00529
Rpm information missing
	No signal	- Hall sender (G40) in distributor defective - Wiring open circuit - Wiring has short to positive - Wiring has short to earth	- Engine does not start	- Check G40 => Page 28-10
00530
Throttle valve positioner/potentiometer -G881)
	Open circuit/short to positive	- Wiring open circuit or short to positive - G88 defective	- Cold starting problems - Idling speed not within tolerances	- Check G88 , check throttle valve control part
	Short to earth	- Wiring has short to earth - G88 defective	- Cold idling speed problems - Rough idling

1) The throttle valve positioner/potentiometer (G88) is a component of the throttle valve control part (J338).

=> Current flow diagrams, Electrical fault finding and Fitting locations binder


V.A.G 1551 print-out		Possible causes of fault	Possible effects	Fault remedy
00532
Supply voltage
	Signal too large	- Battery voltage above 16.3 V	- No idling speed adaption	- Check alternator
00545
Engine/gearbox electrical connection
	Signal too large	- Fault on automatic gearbox - Wiring to automatic gearbox has short to earth	- Hard gear changes	- Check wiring to automatic gearbox: => Current flow diagrams, Electrical fault finding and Fitting locations binder Interrogate fault memory of automatic gearbox: => Automatic gearbox 001; Self-diagnosis; Interrogate fault memory


V.A.G 1551 print-out		Possible causes of fault	Possible effects	Fault remedy
00609
Ignition output 1
	Short to positive	- Wiring to ignition transformer has short to positive	- Engine does not start	- Check ignition transformer output stage
	Open circuit/short to earth	- Wiring open circuit in earth wire - Wiring has short to earth
00638
Engine/gearbox electrical connection 2
	Short to positive	- Wiring has short to positive	- Hard gear changes	- Check wiring to automatic gearbox: => Current flow diagrams, Electrical fault finding and Fitting locations binder
	Open circuit/short to earth	- Wiring open/short to negative		- Interrogate automatic gearbox fault memory: => Automatic gearbox 001; Self-diagnosis; Interrogate fault memory


V.A.G 1551 print-out		Possible causes of fault	Possible effects	Fault remedy
00653
Gearbox selector lever plausibility
	Implausible signal	- Fault from automatic gearbox - Wiring to selector lever switch defective	- Increased idling speed	- Check wiring to selector lever switch: => Current flow diagrams, Electrical fault finding and Fitting locations binder Interrogate automatic gearbox fault memory: => Automatic gearbox 001; Self-diagnosis; Interrogating fault memory
01087
	Basic setting not carried out	The throttle valve control part learning sequence has not been completed	---	- Carry out basic setting


V.A.G 1551 print-out		Possible causes of fault	Possible effects	Fault remedy
01126
Engine speed signal
	Short to positive	- Wiring open circuit or short to positive	- Rev. counter does not operate	- Check speed signal => Page 01-24 , final control diagnosis
	Short to earth	- Wiring has short to earth
01247
Activated charcoal filter solenoid valve 1 -N80
	Open circuit/short to earth	- Wiring open circuit or short to earth - N80 defective	- Rough idling - Fuel odours	- Check N80 => Page 01-24 , final control diagnosis
	Short to positive	- Wiring has short to positive - N80 defective


V.A.G 1551 print-out		Possible causes of fault	Possible effects	Fault remedy
01249
No.1 cyl. injector -N30
	Short to positive	- N30 defective - Wiring has short to positive	- Increased emissions values - Poor starting problems	- Check N30...N33 => Page 24-73 , checking injectors
	Open circuit/short to earth	- N30 defective - Wiring open circuit in earth wire - Short to earth	- Driving characteristics faults - Poor throttle response - Rough idling
01250
No. 2 cyl. injector -N31
	Short to positive	See fault code 01249, Cyl. 1
	Open circuit/short to earth
Output on V.A.G 1551 printer		Possible causes of fault	Possible effects	Fault remedy
01251
No. 3 cyl. injector -N32
	Short to positive	See fault code 01249, Cyl. 1
	Open circuit/short to earth
01252
No. 4 cyl. injector -N33
	Short to positive	See fault code 01249, Cyl. 1
	Open circuit/short to earth
Output on V.A.G 1551 printer		Possible causes of fault	Possible effects	Fault remedy
01259
Fuel pump relay -J17
	Short to positive	- J17 defective - Wiring has short to positive	- Engine does not start	- Check J17 => Page 01-24 , final control diagnosis
	Open circuit/short to earth	- J17 defective - Wiring open circuit in earth cable - Short to earth
17978
Engine control unit blocked		- Attempted manipulation - Short in communication cable - Incorrect coding - Immobilizer control unit defective/missing	- Engine starts briefly and then stops again	- Adapt engine control unit to electronic immobilizer => Page 24-68 Check electronic immobilizer: => Repair group 96; Servicing electronic immobilizer
Output on V.A.G 1551 printer		Possible causes of fault	Possible effects	Fault remedy
65535
Control unit defective		- Engine control unit internally defective	- Driving characteristics faults - Engine stopped	- Renew J382 if necessary, => Page 24-11 , item 30

Power unit
1AV fuel injection and ignition system (2-valve) / Self diagnosis, V.A.G Inspection Service / Self diagnosis
Fault table

Final control diagnosis > < Interrogating and erasing fault memory

Volkswagen Workshop Service and Repair Manuals

Polo Mk3

Power unit 1AV fuel injection and ignition system (2-valve) / Self diagnosis, V.A.G Inspection Service / Self diagnosis Fault table

Power unit 1AV fuel injection and ignition system (2-valve) / Self diagnosis, V.A.G Inspection Service / Self diagnosis Fault table

Power unit
1AV fuel injection and ignition system (2-valve) / Self diagnosis, V.A.G Inspection Service / Self diagnosis
Fault table

Power unit
1AV fuel injection and ignition system (2-valve) / Self diagnosis, V.A.G Inspection Service / Self diagnosis
Fault table