AUDI A4 1998 B5 / 1.G AFC Engine Idle Speed Checking Workshop Manual
A4 1998 B5 / 1.G
AUDI
AUDI
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AUDI A4 1998 B5 / 1.G AFC Engine Idle Speed Checking Workshop Manual
Page 3 of 6
24-17
- Check DTC memory page 01
-13
.
No DTCs should be stored. If necessary:
- Repair malfunction.
- Erase DTC memory.
- Stop off engine and restart.
- Test drive and, as a check, check DTC
memory again.
Note:
Erasing DTC memory resets the readiness code
(as well as with address word 01, "Basic Setting"
function 04 and address word 33, mode 4).
- After checking DTC memory, start engine and
let idle.
CAUTION!
Do NOT run tests or record displays while the
radiator coolant fan is running.
-
Using VAG 1551 scan tool, select "Basic
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Page 4 of 6
Setting" function 04, input display group number
003, and advance until the display shows "Basic
Setting 3" page 01
-150
.
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Page 5 of 6
24-18
Basic Settin
g 3
1 2 3 4
Indicated on display
(1 to 4 = Display fields)
Notes:
If the specified value is not obtained:
Continue with test, if the engine coolant temperature exceeds 85 C
(185 F) display group 001, display field 1. In "Basic Setting" function 04 the EVAP canister purge regulator valve
-N80- is closed page 01
-150
.
- Briefly increase engine speed (RPM) and then let idle for another 2
minutes.
- Observe value in display field 1.
Specified value: 650 to 750 RPM
-
Push button.- Press buttons -0- and -6- to select "End Output" function 06.
- Press -Q- button to confirm input.
- Check DTC memory again page 01
-13
.
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Page 6 of 6
24-19
If the idle speed is too high and no DTC is found
stored in DTC memory, perform the following
checks:
- Check Closed Throttle Position (CTP) switch
page 24
-73
.
- Check for large quantity intake air leak Repair
Group 01, "Basic Setting" function 04, display
group 001, 005, 006, or 010.
- Check Idle Air Control (IAC) valve page 24
-
37
.
- Check learning values for idle speed control
Repair Group 01, "Basic Setting" function 04,
display group 004. If idle speed is too low and no DTC is found
stored in DTC memory; perform the following
checks:
- Check Closed Throttle Position (CTP) switch
page 24
-73
.
- Check Idle Air Control (IAC) valve page 24
-
37
.
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