Self-diagnosis
Display group overview for vehicles >02.92
Display group number
Display in display zone
00
2 = CO-Potentiometer
3 = Coolant temperature
5 = Lambda probes signal
At the moment the other display zones are not required by the service department.
01
1 = Engine speed
2 = Engine load signal
3 = Coolant temperature
4 = Injection period
02
1 = Engine speed
2 = Intake air temperature
3 = Not for service department
4 = Injection period
03
1 = Engine speed
2 =Coolant temperature
3 = Not for service department
4 = Injection period
04
1 = Engine speed
2 = Engine load signal
3 = Not for service department
4 = Injection period
05
1 = Engine speed
2 = Throttle valve angle
3 = Not for service department
4 = Injection period
Добавлено
Digifant injection and ignition system
Checking intake manifold pressure sender
Carry out check with fault reader V.A.G 1551 in function 08, "Read measuring value block", with engine idling.
● Fault reader V.A.G 1551 connected and brought into "Read measuring value block" function (display group number 04)
=> Page 01-25, read measuring value block
→ Indicated on display:
(1...4 = Display zones) Read measured value block 2 ⇒
1 2 3 4
Do not continue with check until the coolant temperature is above
85 °C.
‒ Read off figure displayed in display zone.
‒ Vehicles ▸ 02.92 display zone 2
‒ Vehicles 03.92 ▸ display zone 4
Specification: 20...40 % fluctuating
If a constant figure of approx. 90 % is indicated:
‒ Check vacuum pipe to Digifant control unit (J169), if necessary renew control unit.
‒ Press ⇒ key.
‒ Input 06 for "End output" and confirm with Q.
Добавлено
Digifant injection and ignition system
Checking throttle valve potentiometer
Notes:
◆ On vehicles with an automatic gearbox there are two potentiometers in one housing mounted on the throttle valve housing. Two sets of wiring come from the potentiometers.
◆ The wiring with the 4-pin connector leads to the automatic gearbox control unit (G217). Checking the automatic gearbox potentiometer is carried out by interrogating fault memory.
=> Automatic gearbox 098; Repair group 01; Automatic gearbox 098 self-diagnosis, Interrogating and erasing fault memory
◆ The wiring with the three-pin connector (also on vehicles with manual gearbox) leads to the Digifant control unit (J169).
◆ After removing and installing and/or replacing the throttle valve potentiometer initiate basic setting => Page 01-22 and if necessary bring automatic gearbox control unit into basic setting.
=> Automatic gearbox 098; Repair group 01; Automatic gearbox 098 self-diagnosis, initiating basic setting.
The control unit receives the following information via the throttle valve potentiometer:
Throttle valve closed:
◆ Switches off mixture during overrun cut-off,
◆ Idling stabilization,
◆ Ignition timing control at idling (DIS function).
Throttle valve being opened:
◆ Injection rate for acceleration enrichment.
Throttle valve fully open:
◆ Injection rate for full load enrichment.
Check with fault reader V.A.G 1551 in function 08, "Read measuring value block", with the ignition switched on.
● Fault reader V.A.G 1551 connected and brought into function "Read measured value block"
=> Page 01-25, read measured value block
‒ Press keys 0, 0 and 2 for "Display group number 2" and confirm entry with Q key.
→ Indicated on display:
(1...4 = Display zones) Read measured value block 2 ⇒
1 2 3 4
‒ Slowly open throttle valve and watch angle display:
‒ Vehicles ▸ 02.92 display zone 2
‒ Vehicles 03.92 ▸ display zone 3
The figure must rise uniformly over the whole range.
Throttle valve position Idling stop
Vehicles
▸ 02.92 5...30 <°
Vehicles
03.92 ▸ 0 <°
Full throttle stop
min. 100 <°
min. 64 <°
‒ Press ⇒ key.
‒ Input 06 for "End output" and confirm with Q.
If the figure does not increase uniformly:
‒ Carry out electrical check =>Page 01-34.