check AUDI A6 1998 C5 / 2.G AHA Engine On Board Diagnostic Service Manual

01-46

Diagnostic
Trouble Code
(DTC)
Malfunction text
MIL
Corrective action
SAE
VAG



P1564 17972 Idle Speed Contr. Throttle Pos.
Low Voltage During Adaptation
(Supply voltage under 10 V during adaptation of throttle
valve control module to engine control module.) Off
- Check voltage supply to ECM
page 24
-90

P1565 17973 Idle Speed Contr. Throttle Pos.
Lower Impact Not Attained
(Lower specification not attained during adaptation of
throttle valve control module to engine control module,
e.g., accelerator pedal cable incorrectly adjusted,
throttle body dirty, etc.) 2 Dcy
- Clean throttle body
- Check accelerator pedal cable
adjustment Repair Manual,
Fuel Supply System, Repair
Group 20 P1600 18008 Power Supply (B+) Terminal 15
Low Voltage Immed.
- Check voltage supply to Engine
Control Module (ECM) page
24
-90

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01-47

Diagnostic Trouble
Code (DTC)
Malfunction text
MIL
Corrective action
SAE
VAG



P1602 18010 Power Supply (B+) Terminal 30
Low Voltage Off
- Check voltage supply to ECM page 24
-
90

P1606 18014 Rough Road Spec Engine Torque ABS-
ECU
Electrical Malfunction Off
- Check ABS control module signal for
rough road recognition page 24
-174

P1612 18020 Electronic Control Module
Incorrect Coding
(Vehicle with automatic transmission is
coded for manual transmission.) Immed.
- Code ECM page 01
-12
Electronic Control Module
Incorrect Coding
(Vehicle with ASR is not coded for ASR) Off
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01-48

Diagnostic Trouble
Code (DTC)
Malfunction text
MIL
Corrective action
SAE
VAG



P1624 18032 MIL Request Sign. active Immed.
Repair Manual, 5 Spd. Automatic Transmission 01V,
Repair Group 01 - Check DTC memory for Transmission Control Module
(TCM) and correct malfunctions
P1626 18034 CAN-Bus
Missing Message from
Transm. Contr. 2 Dcy
- Check CAN-Bus page 24
-172
P1640 18048 Internal Contr. Module
(EEPROM)
Error 2 Dcy
- Replace ECM page 01
-68
P1681 18089 Contr. Unit Programming
Programming not Finished Immed.
- Replace ECM page 01
-68
P1690 18098 Malfunction Indicator Light
Malfunction Off
- Check wire from ECM to Malfunction Indicator Light
(MIL) page 01
-2
Note for DTC P1624/18032:
If this malfunction is detected by the Transmission Control Module (TCM), the MIL is switched on by the ECM. In this case,
the ECM stores the malfunction "MIL Request Sign. active" (DTC P1624/18032). After repairing the malfunction, erase DTC
memory of the ECM.
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01-49

Erase DTC Memory (scan tool function
05)


Required special tools and test equipment
VAG1551 Scan Tool (ST) with VAG1551/3
adapter cable

Test condition
Malfunction(s) repaired

Note:
If DTC memory has been erased, generate new
readiness code page 01
-73
.

Erasing

- Connect VAG1551/VAG1552 Scan Tool (ST)
and press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (engine running at
idle) page 01
-8 .
Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -2- to select "Check DTC Memory" function 02,
and press -Q- button to confirm input.
-
Press button to advance through program sequence until all stored
malfunctions have been displayed.
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01-50

- Press buttons -0- and -5- to select "Erase DTC
Memory" function 05, and press -Q- button to
confirm input. Rapid data transfer DTC Memory is erased

Indicated on display
-
Press button to advance through program sequence.
Rapid data transfer
HELP
Select function XX

Indicated on display
Safety precautions for road testing vehicle page 24
-9 - Press buttons -0- and -6- to select "End Output" function 06, and press
-Q- button to confirm input.
- Road test.
- Initiate "Automatic Test Sequence" by pressing -0- button twice to
insert address word 00.
- Check readiness code page 01
-70
. If DTC memory has been
erased, or ECM has been disconnected, generate readiness code
page 01
-73
.
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01-51

Output Diagnostic Test Mode (DTM)
(scan tool function 03)


Notes:

The output Diagnostic Test Mode (DTM) can be
activated only with ignition switched on and the
engine not running.
The output DTM is interrupted if the engine is
started, or if a rotary pulse from the ignition
system is recognized.
When operating in the output DTM, the
individual output signals are actuated until the
program sequence is advanced by pressing the
button.

Output signals are checked by listening for the
sound of the component being actuated, or
feeling for mechanical evidence of actuation,
such as clicking, vibration, etc.
Without letting the engine run, briefly switch the
ignition off for approx. 20 seconds before
repeating the output checks.
During the entire output DTM sequence, the
electric fuel pump will run.
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01-53

Test sequence

- Connect VAG1551/VAG1552 scan tool and
insert "Engine Electronics" address word 01
(ignition on) page 01
-8 .
Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -3- to select "Output Diagnostic Test Mode"
function 03.
Rapid data transfer
Q
03 - Output Dia
gnostic Test Mode

Indicated on display
Fuel injectors:
- Press -Q- button to confirm input.
Output Diagnostic Test Mode Cylinder 1 Fuel In
jector-N30

Indicated on display
Note:
The fuel pump relay must be activated, the fuel pump must run, and you
must clearly hear the flow of fuel in the fuel pressure regulator. If the fuel
pump does not run, check fuel pump relay and connections page 24
-
95
.
- Operate throttle valve at throttle body.
As soon as the Closed Throttle Position (CTP) switch opens, cylinder 1
fuel injector must be actuated (click) 5 times.
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01-54
To check remaining fuel injectors:

-
Press button and open the throttle valve
again.
As soon as the Closed Throttle Position (CTP)
switch opens, the applicable fuel injector must
be actuated (click) 5 times.

- Repeat for each fuel injector.
To skip individual tests:

-
Press button to advance through program
sequence. If one or more of the fuel injectors is not
actuated:

- Check fuel injectors page 24
-102
.
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01-55

EVAP canister purge regulator valve -N80-:

-
Press button.Output Diagnostic Test Mode EVAP Canister Pur
ge Re
gulator Valve-N80

Indicated on display
The valve will click until pressing the button to advance the program
sequence.
If the valve is not actuated (does not click):
Secondary Air Injection (AIR) solenoid valve -N112-: - Check EVAP canister purge regulator valve page 24
-116
.
-
Press button.
Output Diagnostic Test Mode Secondar
y Air In
jection Valve-N112

Indicated on display
The valve will click until pressing the button to advance the program
sequence.
If the valve is not actuated (does not click): - Check secondary air injection solenoid valve -N112- Repair Manual,
2.8 Liter V6 5V Engine Mechanical, Repair Group 26.
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01-56

Secondary Air Injection (AIR) pump relay -
J299-:

-
Press button.Output Diagnostic Test Mode Secondary Air Injection Relay-J299

Indicated on display
The relay will be actuated and turn on the secondary AIR pump motor
until pressing the button to advance the program sequence.
If the relay is not actuated (does not click) or the motor does not run:
Intake manifold tuning valve -N156- (change-over valve): - Check secondary air injection pump relay -J299- Repair Manual, 2.8
Liter V6 5V Engine Mechanical, Repair Group 26. -
Press button.
Output Diagnostic Test Mode Intake Manifold Changeover Valve-N156

Indicated on display
The valve will click until pressing the button to advance the program
sequence.
If the valve is not actuated (does not click): - Check intake manifold tuning valve -N156- page 24
-116
.
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