sensor AUDI A4 1998 B5 / 1.G AEB Engine Technical Data Spark Plug

28-2

Camshaft Position (CMP) sensor -G40-,
checking


Required special tools and test equipment

VAG 1598/22 test box
Multimeter US 1119 (Fluke 83 or equivalent)
VW 1594 connector test kit
Wiring diagrams

Checking

- Disconnect 3-pin connector from Camshaft
Position -G40- sensor.

- Connect multimeter US 1119 (Fluke 83 or equivalent) to measure
voltage across CMP connector terminals 1 (B+) and 3 (Ground), using
adapter cables from VW 1594 connector test kit.
- Switch ignition on.
- Measure voltage between terminals 1 and 3.
Specified value: 4.5 volts minimum
- Switch ignition off.
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28-4
If wiring is OK (and voltage across terminals 1
and 3 is OK):

- Replace Camshaft Position (CMP) sensor.
If wiring is OK (but still no voltage across
terminals 1 and 3 :

- Replace Motronic ECM -J220- Page 01
-57
.

- Carry out adaptation of throttle valve control
module to ECM Page 24
-119
.

- Check readiness code Page 01
-59
. If
Diagnostic Trouble Code (DTC) memory has
been erased, or ECM was disconnected,
generate new readiness code Page 01
-62
.
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28-5

Knock sensor and knock sensor
system, checking


Required special tools and test equipment

VAG 1551/1552 Scan Tool (ST) with adapter
cable VAG 1551/3
VAG 1598/22 test box
Multimeter US 1119 (Fluke 83 or equivalent)
VW 1594 connector test kit
Wiring diagrams

Checking

- Connect VAG 1551/1552 Scan Tool (ST) and
press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (engine running at
idle) 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.
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28-6

Read Measuring Value Block 20 1 2 3 4

Indicated on display (1-4 display groups)
Note:
The test must be carried out during a road test because the knock sensor
system is only active as of a certain engine speed.
WARNING!
A second technician is required to operate the VAG 1551 scan tool
during the road test. - Road test car and compare display with specified values for knock
sensor system in display field 1-4.

Display groups

1 2 3 4
Display group 20: Knock sensor system
Display
xx.x
xx.x
xx.x
xx.x
Indicates Timing correction,
cylinder 1 Timing correction,
cylinder 2 Timing correction
cylinder 3 Timing correction,
cylinder 4
Range
0.0 -15.0
(crankshaft)
0.0 -15.0
(crankshaft)
0.0 -15.0
(crankshaft)
0.0 -15.0
(crankshaft)
Specified value
0.0 -10.0
(crankshaft)
0.0 -10.0
(crankshaft)
0.0 -10.0
(crankshaft)
0.0 -10.0
(crankshaft)
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28-7
If displayed values are OK:

- Check readiness code Page 01
-59
. If
Diagnostic Trouble Code (DTC) memory has
been erased, or ECM was disconnected,
generate new readiness code Page 01
-62
.

-
Press button to advance program
sequence.
- Press buttons -0- and -6- to select "End Output"
function 06, and press -Q- button to confirm
input.
Evaluating display group 20 Display group: 20
Display fields: 1-4
Possible cause

Correcting action

All cylinders retarded more
than 10 (crankshaft)
Knock sensor faulty- Continuation Page 28
-8

Connector corroded
Knock sensor
incorrectly torqued - Loosen knock sensor and re-tighten to 20 Nm (15 ft lb)
Components loose
on engine - Tighten components
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28-8

Continuation

- Disconnect 3-pin connector from Knock Sensor
(KS) 1 -G61-.

If resistance is OK (no continuity): - Connect multimeter US 1119 (Fluke 83 or equivalent) to measure
resistance between connector terminals, using adapter cables from VW
1594 connector test kit.

Connector terminal 1 to terminal 2
Connector terminal 1 to terminal 3
Connector terminal 2 to terminal 3
Specified value:
- Connect VAG 1598/22 test box to Motronic ECM harness connector
Page 01
-56
.

- Check wiring for open circuit between ECM/test box and 3-pin harness
connector, according to wiring diagram.

Connector terminal 1 to ECM/test box socket 68
Connector terminal 2 to ECM/test box socket 67
Connector terminal 3 to ECM/test box socket 2
Specified value: max. 1.5
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28-9

- Check wiring for short circuits between terminals
of 3-pin connector, and between connector and
ECM/test box.


Connector terminal 2 to ECM/test box
socket 68

Connector terminal 3 to ECM/test box
socket 68

Connector terminal 3 to ECM/test box
socket 67

Specified value:
If the wiring is OK:

- Loosen knock sensor and re-tighten to 20 Nm
(15 ft lb).
If the malfunction still exists (stored in DTC
memory):

- Replace Knock Sensor (KS) 1 -G61-.

-
Check readiness code Page 01
-59
. If
Diagnostic Trouble Code (DTC) memory has
been erased, or ECM was disconnected,
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28-10

- Disconnect 3-pin connector from Knock Sensor
(KS) 2 -G66-.

If resistance is OK (no continuity): - Connect multimeter US 1119 (Fluke 83 or equivalent) to measure
resistance between connector terminals, using adapter cables from VW
1594 connector test kit.

Connector terminal 1 to terminal 2
Connector terminal 1 to terminal 3
Connector terminal 2 to terminal 3
Specified value:
- Connect VAG 1598/22 test box to Motronic ECM harness connector
Page 01
-56
.

- Check wiring for open circuit between ECM/test box and 3-pin harness
connector, according to wiring diagram.

Connector terminal 1 to ECM/test box socket 60
Connector terminal 2 to ECM/test box socket 67
Connector terminal 3 to ECM/test box socket 2
Specified value: max. 1.5
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28-11

- Check wiring for short circuits between terminals
of 3-pin connector, and between connector and
ECM/test box.


Connector terminal 2 to ECM/test box
socket 60

Connector terminal 3 to ECM/test box
socket 60

Connector terminal 3 to ECM/test box
socket 67

Specified value:
If the wiring is OK:

- Loosen knock sensor and re-tighten to 20 Nm
(15 ft lb).
If the malfunction still exists (stored in DTC
memory):

- Replace Knock Sensor (KS) 2 -G66-.

-
Check readiness code Page 01
-59
. If
Diagnostic Trouble Code (DTC) memory has
been erased, or ECM was disconnected,
Pa
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