1998 AUDI A4 ATQ Engine Additional Signals Testing Workshop Manual

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- Check Clutch Pedal Position (CPP) switch in display field 2.
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Display fields

1 2 3 4
Display group 066: Signals to Engine Control Module (ECM)
Display xxx km/h
XXXX xxx km/h XXXX
Indicated ACTUAL speed
Switch positions SPECIFIED speed Switch positions
Functional range
X0XX
X1XX
Specified value
X0XX
(at clutch pedal
not operated)

X1XX
(at clutch pedal
operated)
Notes
Value:
X = no significance
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If indications do not resemble description:

Check switch

- Remove driver-side storage compartment.

Repair Manual, Body
-Interior, Repair Group
68; Instrument Panel; Removing Driver
-Side
Storage Compartment


- Disconnect harness connector at Clutch Pedal
Position (CPP) switch.

Note:
Connector sockets are marked on the back side
of the connector.

- Connect multimeter between terminal 1 and 2
for resistance measurement.


Specification: approx. 0

- Depress clutch pedal.


Specification: (no continuity)
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If specified value is not obtained:

- Check adjustment of switch or

- Replace Clutch Pedal Position (CPP) switch.
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If specified value is obtained:

Checking voltage supply

If LED does not light up:
Electrical Wiring Diagrams, Troubleshooting & Component Locations
binder - Connect VAG1527B voltage tester as follows:Harness connector
Terminal
Measure to
1 Chassis Ground (GND)
- Switch ignition on.

LED must light up.
- Check wire connection from terminal 1 of connector to fuse for open
circuit and short circuit to Ground (GND):
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If LED lights up:

Checking activation

- Connect VAG1598/31 test box at wiring harness
to ECM, do not connect ECM Page 24
-17
.

- Check the following wire connection for open circuit and short circuit to
Ground (GND) and B+: Harness connector
Terminal
VAG1598/31 test box
Socket
2 39
- Repair open circuit or short circuit if necessary.
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Wire for crash signal, checking

The Engine Control Module (ECM) receives the
crash signal ("Crash shut-off was triggered") from
the airbag control module.
When the airbag control module sends the crash
signal to the ECM (during an accident or when
output DTM is being performed for the airbag
system), the ECM switches the Fuel Pump (FP)
off. This means that the engine will stop running
but can be started again afterward (e.g. to
remove vehicle from danger).

- Connect VAG1598/31 test box at wiring harness
to ECM, do not connect ECM Page 24
-17


- Check the following wire connection for open
circuit and short circuit to Ground (GND) and B+:

Test box
VAG1598/31
Socket
Control module for
Airbag -J234-
Terminal
67 Electrical Wiring Diagrams,
Troubleshooting & Component
Locations binder
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- Repair open circuit or short circuit if
necessary.

Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder If no malfunctions are found in wire:

- Check DTC memory of control module for
airbag:

Repair Manual, Body
-On Board Diagnostic
(OBD), Repair Group 01; On Board Diagnostic (OBD) of airbag system BAE (basic trigger unit) with side airbag; DTC memory, checking

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