AD07.13-P-2001-01D | Notes, DFI DTC memory | Engine 604.910 in model 202 as of 1.12.94 up to 31.7.96 Engine 604.912 in model 210 up to 31.5.96 |
Notes on fault memory
Fault memory: Fault readout
Current faults: have a gray grid background
Stored faults: have a light background.
All inputs/outputs are checked for plausibility during operation.
All faults which exist for more than 0.5 s are stored in the fault memory of the DFI control module (N3/8).
The faults remain stored with ignition "OFF" and after disconnecting the vehicle battery.
In the case of major faults which exist for > 1 s, the Electronic Diesel Control malfunction indicator lamp (EDC, A1e34) is illuminated.
Such faults are:
- CKP sensor (IFI/DFI) (L5/6)
- Distributor pump (DFI) (Y23/2)
- Cam ring position sensor (Y23/2l1)
- Distributor shaft position sensor (Y23/2l2)
- Shut-off valve (Y23/2y1)
- Check valve (Y23/2y2)
- Adjusting valve (Y23/2y3)
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- Supply valve (Y23/2y4)
- IFI/DFI accelerator pedal position sensor (R25/2)
- Overvoltage protection relay module (5-pin) (K1), model 202
- Relay module (HFM-SFI, HFM-SFI with air pump, ME-SFI, EDC base function) K40), model 210
- DFI control module (N3/8).
Fault ambient data
The fault ambient data at the time the fault was stored can also be displayed with the HHT. Only the ambient data which existed when the fault occurred for the first time is stored. The ambient data is spread over several display screens (up to 8 display screens), with the last two display screens intended for development only.
Display screens with the result /F explain the fault causes, e.g.
Voltage too high
Voltage too low
Signal too strong
Signal too weak
Value implausible
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Formation of substitute value in the event of signal failure
In the event of an input signal failure the DFI control module (N3/8) forms a substitute value on the basis of other signals in order to retain system operation.
Formation of a substitute value may result in:
- Reduction in engine output/reduction in maximum engine speed
- Deactivation of smooth running control
- Failure of exhaust-gas recirculation
- Failure of cruise control (AT only)
- Failure of intake pressure control