ESP AUDI A6 1997 C5 / 2.G ATQ Engine Ignition System Checking Workshop Manual

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Component location Overview of Component
Locations, page Page 24
-5

Notes:

Ignition coils and power output stage are a
common part.
Primary resistance of ignition coils cannot be
measured.
Secondary resistance must first be measured
with the ignition wires connected to the ignition
coils via the spark plug connectors of the
corresponding cylinder (This measurement will
include measurement of the shielded
resistances of the ignition wires).

- Disconnect 5-pin connector from ignition coils.

Check ignition coils (-N-, -N128- and -N158-)

- Pull the ignition wires from the spark plugs.

- In order to perform a resistance measurement, connect multimeter
between both spark plug connectors of the respective ignition circuit to
be checked.

Specification: each 16 to 27 k
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All models
Range A shows the resistance values for the
temperature range from 0-50 C, and range B
shows the values for the temperature range from
50-100 C.

Read-out examples:
If specified value is not obtained:
If specified value is obtained:
30 C corresponds to a resistance of 1500 to 2000 80 C corresponds to a resistance of 275 to 375
- Replace coolant temperature sensor.
- Connect VAG1598/31 test box at wiring harness to ECM, do not
connect ECM Page 24
-17
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Component location Overview of Component
Locations, page Page 24
-5

Notes:

Camshaft Position (CMP) Sensor -G40- is
located at rear of left cylinder block (bank 2).
Camshaft Position (CMP) Sensor 2 -G163- is
located at front of right cylinder block (bank 1).

Checking activation

- Slide back rubber grommet at connector of the
respective Camshaft Position (CMP) Sensor
(connector remains connected to Camshaft
Position (CMP) Sensor).

Note:
Connector socket numbers are shown on the rear side of the connector. - Connect VAG1527B voltage tester between sockets 2 (CMP sensor
signal) and 1 (B+).
- Operate starter for a few seconds.

LED must blink briefly at every second engine rotation.
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Note:
Voltage testers do not go out completely during
low current pick-up between activations by the
ECM, but rather continue to glow a little and then
get significantly brighter during activation.
If LED does not blink:

Checking voltage supply

- Disconnect connector at respective Camshaft
Position (CMP) sensor.

- Switch ignition on.

- Connect multimeter for voltage measurement as follows:Harness connector
Terminal
Measure to
1 Engine Ground (GND)

Specification: about 5 V
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Checking signal wire

Checking Ground (GND) wire
If all specified values are being reached and the LED does not blink
(measured between terminal 1 and 2 with starter and connector
connected): - Connect multimeter for voltage measurement as follows:Harness connector
Terminal
Measure to
2 Engine Ground (GND)

Specification: approx. battery voltage
- Connect multimeter for voltage measurement as follows:
Harness connector
Terminal
Measure to
3 B+

Specification: approx. battery voltage
- Repair open circuit or short circuit if necessary.
- Replace respective Camshaft Position (CMP) sensor.
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