Page 25 of 59
28-24
Checking wire connections
- Connect VAG1598/31 test box at wiring harness
to Engine Control Module (ECM), do not connect
ECM Page 24
-19
.
- Disconnect connector -1- at Intake Air Temperature (IAT) sensor -G42-
(item no. 2).
- Check following wire connections for open circuit and short circuit to
Ground (GND) and B+: Harness connector
Terminal
VAG1598/31 test box
Socket
1 85
2 108
- Check both wires to each other for short circuit.
- Repair open circuit or short circuit if necessary.
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Page 27 of 59
28-26
Engine speed (RPM) sensor -G28-,
checking
Special tools and equipment
VAG1526A
VAG1594A
VAG1598/31
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Page 31 of 59
28-30
Engine Coolant Temperature (ECT) sensor
-G62-, checking
Special tools and equipment
VAG1526A
VAG1594A
VAG1598/31
VAS5051 with VAG5051/1
- or
VAG1551 with VAG1551/3A
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Page 37 of 59
28-36
Voltage supply for control module,
checking
Special tools and equipment
VAG1526A
VAG1594A
VAG1598/31
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Page 44 of 59
28-40
Knock recognition control stop,
checking
If a DTC is stored regarding "Knock control
regulation limit reached":
- Perform following tests:
Possible cause
Corrective action
DTC for all cylinders
Poor fuel quality
Operating instructions - Change fuel quality
or
Cylinder 1/2 or 3/4
Knock sensor tightened to incorrect torque- Loosen knock sensors and tighten to 20 Nm
Knock sensor faulty- Check knock sensor Page 28
-41
Corrosion at harness connector- Check harness connector
Engine accessories loose- Secure engine accessories
DTC for one Cylinder
Engine damage- Check compression pressure
Engine accessories loose- Secure engine accessories
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Page 45 of 59
28-41
Knock sensors, checking
Special tools and equipment
VAG1526A
VAG1594A
VAG1598/31
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Page 46 of 59
28-42
Component location Overview of component
locations Page 24
-5
Note:
Knock Sensor (KS) 1 -G61- and Knock Sensor
(KS) 2 -G66- themselves cannot be electrically
tested.
Use only gold-plated terminals when servicing
harness connector for knock sensors.
For the knock sensors to function properly, it is
important that tightening torque be exactly 20
Nm.
Check harness connector from knock sensor to
wiring harness for corrosion.
Checking knock sensor wiring
- Disconnect harness connector for Knock Sensor (KS) 1 -G61- (item no.
5) or Knock Sensor (KS) 2 -G66- (item no. 4) in engine compartment.
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Page 49 of 59
28-45
Camshaft Position (CMP) sensor 2 -G40-,
checking
Special tools and equipment
VAG1526A
VAG1527B
VAG1594A
VAG1598/31
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