relay AUDI A4 1997 B5 / 1.G AFC Engine On Board Diagnostic Multiport Fuel Injection User Guide

01-145

Output Diagnostic Test Mode (scan tool
function 03)


Test requirements:

Fuses for engine electronics OK
Fuel Pump (FP) Relay OK
Ground connections OK page 01
-5

Triggering sequence:

Fuel Pump (FP) relay -J17-
Idle Air Control (IAC) valve -N71-
Intake manifold change-over valve -N156-
EVAP canister purge regulator valve -N80-
EGR vacuum regulator solenoid valve -N18-
Secondary Air Injection (AIR) solenoid valve -
N112- (only on vehicles with secondary air
system)
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port Fuel In
jection
(MFI
)
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Secondary Air Injection (AIR) pump relay -J299-
(only on vehicles with secondary air system)
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jection
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01-147

Rapid data transfer
Q
03 - Output Diagnostic Test Mode

Indicated on display
- Press -Q- button to confirm input.
Output diagnostic test mode Fuel Pump
(FP) Rela
y -J17

Indicated on display
The fuel pump relay must be triggers and the fuel pump must run; the
flowing noise at the fuel pressure regulator can be clearly heard.
- If fuel pump relay is not triggered, check control page 24
-24
.
-
Press button.
Output diagnostic test mode Idle Air Control
(IAC
) valve -N71

Indicated on display
This valve is triggered (clicks) until moving on to the next output by
pressing the button. - If the valve is not triggered (does not click), check -N71- page 24
-
37
.
-
Press button.
Output diagnostic test mode Intake manifold chan
ge-over valve -N156

Indicated on display
This valve is triggered (clicks) until you move on to the next output by
pressing the button. - If the valve is not triggered (does not click), check intake manifold
change-over valve -N156- page 24
-64
.
-
Press button.
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jection
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)
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01-149

Only on vehicles with secondary air injection
(AIR) system Output diagnostic test mode Secondar
y Air In
jection
(AIR
) solenoid valve -N112

Indicated on display
This valve is triggered (clicks) until you move on to the next output by
pressing the button. - If the valve is not triggered (does not click), check -N112-.
Output diagnostic test mode Secondar
y Air In
jection
(AIR
) pump rela
y -J299

Indicated on display
The secondary air injection pump relay -J299- triggers the secondary air
pump motor and it runs until the output DTM is ended by pushing the
button (maximum 10 sec.). - If secondary air injection pump motor does not run, check engine and -
J299-.
-
Press button.
Rapid data transfer
HELP
Select function XX

Indicated on display
Note:
Before selecting "Output Diagnostic Test Mode" function 03 again, switch
ignition off for approx. 20 sec.
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jection
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)
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01-231
Display group 040 (Heating current of oxygen sensors in front of and behind three way catalytic converter) Display
shows Display specified value
Designation/diagnosis
Basic setting
40
1 2 3 4 At cold start, greater than 3 A after approx. 40 sec: 0.7 -
1.0 A 1 = Heating current, bank 1, heated oxygen
sensor 1
2 = Heating current, bank 2, heated oxygen
sensor 1
At cold start, greater than 3 A after approx. 80 sec: 1.2 -
1.4 A 3 = Heating current, bank 1, heated oxygen
sensor 2
4 = Heating current, bank 2, heated oxygen
sensor 2 Notes:

The current values specified apply only at when battery positive voltage (B+) is 12-14 volts display group 001, display
field 4. The heating of the heated oxygen sensors in front of the three way catalytic converter is switched on with the fuel pump
relay, i.e. immediately at engine start.
The heating of the heated oxygen sensors behind the three way catalytic converter is not switched on immediately at
engine start, but only when the calculated exhaust gas temperature in the three way catalytic converter exceeds 308 C
(586 F) display group 044, display field 2. In order to reach an exhaust gas temperature of 308 C (586 F) in the three
way catalytic converter after a cold start, the car must be driven about 20 sec. with an increased engine speed of 2500
RPM.
Pa
ge 325 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1