AUDI A4 1998 B5 / 1.G AFC Engine Camshaft Position Sensor Checking Workshop Manual

28-33


Camshaft Position (CMP)
sensor (bank 2), checking
The camshaft position sensor is located on the
left rear of the cylinder head page 28
-1 .

Checking voltage supply

If the specified value is not obtained: - Disconnect camshaft position sensor harness connector.
- Switch Fluke 83 multimeter to 20 volt range and connect between
terminal 1 (B+) and terminal 3 (GND).
- Switch ignition on.
Specified value: min. 9 volts
- Check wiring for continuity or short between camshaft position sensor
and ECM using wiring diagram.
- Connect VAG 1598/19 test box to ECM harness connector page 01
-
255
.
- Check camshaft position sensor Ground (GND) wire for continuity
between connector terminal 3 and engine Ground.

Specified value: 1
Pa
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(CMP
) sensor
(bank 2
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28-34

- Check camshaft position sensor B+ wire for
continuity between connector terminal 1 and test
box socket A2.


Specified value: max. 1
- Check both wires for possible short to each
other.
If the specified values are not obtained:

If there is neither an open nor short circuit: - Check for open or short circuit in wiring between the camshaft position
sensor connector and ECM connector -A- or engine Ground (GND),
eliminate as necessary. Camshaft position sensor
connector terminal number ECM connector A terminal
number or engine ground (GND)
1 (B+) A2
3 (Ground) Engine Ground (GND) - Replace ECM page 01
-265
.
Pa
ge 2 of 5 Camshaft Position
(CMP
) sensor
(bank 2
), checkin
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28-35

Function, checking

Note:
For functional check of camshaft position sensor,
disconnect the 4-pin connector from the ignition
coil power output stage and check DTC memory.

Camshaft position sensor voltage supply OK
page 28
-33


- Push back rubber boot on camshaft position
sensor connector (sensor remains connected).

- Connect VAG 1527B voltage tester between
terminal 1 (B+) and 2 (signal).

- Operate starter for several seconds.

Voltage tester must flash briefly every
second engine rotation
If voltage tester does not flash:

- Switch ignition off and disconnect 3-pin harness
connector from camshaft position sensor.

- Connect VAG 1598/19 test box to ECM harness
connector page 01
-255
.
Pa
ge 3 of 5 Camshaft Position
(CMP
) sensor
(bank 2
), checkin
g
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- Check signal wire for continuity between harness connector terminal 2
and test box socket B2.

Specified value: max. 1
Pa
ge 4 of 5 Camshaft Position
(CMP
) sensor
(bank 2
), checkin
g
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28-36
If the specified value is not obtained:

- Eliminate short or open circuit in wiring between
camshaft position sensor harness connector ...

If wiring is OK:
If the specified value is not obtained:
If the specified value is obtained: ... and ECM harness connector -B-.Camshaft position sensor
connector terminal number ECM connector A terminal
number or engine ground (GND)
2 (signal) 8 - Connect Fluke 83 multimeter between test box socket B2 and vehicle
Ground (GND).
- Switch ignition on.
Specified value: min. 4.0 volts
- Replace ECM page 01
-265
.
- Replace Camshaft Position (CMP) sensor.
Pa
ge 5 of 5 Camshaft Position
(CMP
) sensor
(bank 2
), checkin
g
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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pair&id=AUDI.B5.FU01.28.10