VAG 1551/1552 scan tool with VAG 1551/3 adapter cable
VAG 1598/18 test box
Multimeter (Fluke 83 or equivalent)
Connector test kit VW 1594
Wiring diagram
Test sequence
Engine running at idle
- Connect VAG 1551/1552 scan tool and select "Engine Electronics" with address word 01 Page 01-7 .
Rapid data transfer HELP
Select function XX
Indicated on display
- Press buttons -0- and -8- to select "Read Measuring Value Block" function 08 and press -Q- button to confirm input.
Read Measuring Value Block HELP
Input display group number XXX
Indicated on display
- Press buttons -0-, -4- and -5- to input display group 045 (cylinders 1-4), or press buttons -0-, -4- and -6- to input display group 046 (cylinders 5 and 6), and press -Q- button to confirm input.
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28-20
Read Measuring Value Block 45
1 2 3 4
Indicated on display (1-4 = display fields)
Note:
The check must be carried out during a test drive as the knock control is only active with an engine load exceeding 3 ms.
- Carry out a test drive and observe the knock control specifications on display (second technician necessary).
Display fields
1
2
3
4
Display group 045: Knock control
Display
xx.xx
xx.xx
xx.xx
xx.xx
Indicated
Ignition angle correction cylinder 1
Ignition angle correction cylinder 2
Ignition angle correction cylinder 3
Ignition angle correction cylinder 4
Working range
0.0 - 15.0
0.0 - 15.0
0.0 - 15.0
0.0 - 15.0
Specification
0.0 - 12.0
0.0 - 12.0
0.0 - 12.0
0.0 - 12.0
If specification is not attained Page 28-21 , evaluating display group 045 and 046
- Read the readiness code Page 01-31 . If DTC memory has been erased, verify repair via appropriate display group Page 01-33 , Readiness code, creating.
- Press button.
- Press buttons -0- and -6- to select "End Output" function 06 and press -Q- button to confirm input.
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28-21
Evaluating display group 045 and 046
Display group: 045
Display field: 1-4
Possible malfunction cause
Malfunction elimination
Display group: 046
Display field: 1-2
All cylinders more than 12
Knock Sensor (KS) faulty
- Continuation Page 28-22
Connector corroded
Knock sensor not correctly torqued
- Loosen knock sensor and torqued to 20 Nm (15 ft lb)
Attached components on engine loose
- Tighten attached components
Poor fuel quality
- Change type of fuel
One cylinder deviates greatly from the others
Connector corroded
- Continued Page 28-22
Engine damage
- Check compression pressure:
Repair Manual, 2.8 Liter VR6 2V Engine Mechanical, Engine Code(s): AAA, Repair Group 13
Attached components on engine loose
- Tighten attached components
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28-22
Continuation
- Separate white 3-pin connector to Knock Sensor (KS) 1 -G61- (arrow).
- Measure resistance between terminals 1 and 2, 1 and 3 and 2 and 3 on KS connector.
Specification: ohms ()
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28-23
- Connect VAG 1598/18 test box to ECM wiring harness (arrow).
- Check wiring between test box and white 3-pin connector for open circuit according to wiring diagram.
Terminal 1 and test box socket 34
Terminal 2 and test box socket 33
Terminal 3 and test box socket 56
Resistance: max. 1.5 ohms ()
Additionally, check wires for short to one another.
Terminal 3 and test box socket 34
Terminal 3 and test box socket 33
Terminal 2 and test box socket 34
Specification: ohms ()
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28-24
If no wiring malfunction is detected:
- Loosen knock sensor and tighten again to 20 Nm (15 ft lb).
If the malfunction is still present (malfunction again in DTC memory):
- Replace Knock Sensor (KS) 1 -G61-.
- Read the readiness code Page 01-31 . If DTC memory has been erased, verify repair via appropriate display group Page 01-33 , Readiness code, creating.
- Separate black 3-pin connector to Knock Sensor (KS) 2 -G66- (arrow).
- Measure resistance between terminals 1 and 2, 1 and 3 and 2 and 3 on KS connector.
Specification: ohms ()
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28-25
- Connect VAG 1598/18 test box to ECM wiring harness (arrow).
- Check wiring between test box and black 3-pin connector for open circuit according to wiring diagram.
Terminal 1 and test box socket 57
Terminal 2 and test box socket 33
Terminal 3 and test box socket 56
Resistance: max. 1.5 ohms ()
- Additionally, check wires for short to one another.
Terminal 3 and test box socket 57
Terminal 3 and test box socket 33
Terminal 2 and test box socket 57
Specification: ohms ()
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28-26
If no wiring malfunction is detected:
- Loosen knock sensor and tighten again to 20 Nm (15 ft lb).
If the malfunction is still present (malfunction again in DTC memory):
- Replace Knock Sensor (KS) 2 -G66-.
- Read the readiness code Page 01-31 . If DTC memory has been erased, verify repair via appropriate display group Page 01-33 , Readiness code, creating.