ME-SFI diagnosis fault memory function - GF07.61-P-2004F
ENGINE 104.941 /943 /944 /991 /994as of 1.8.96
ENGINE 104.995 with CODE (494a) USA version with CODE (807) Model year 1997 with CODE (808) Model year 1998 with CODE (498) as of Model year 97 Japanese version
ENGINE 111.921 /942 as of 1.9.98, 111.943, 111.944 as of 1.8.96, 111.946 as of 1.6.98, 111.947 /973, 111.975 as of 1.8.96
ENGINE 111.945 in MODEL 208.335/435 as of 1.6.98, 202.020 /080 as of 1.9.98
ENGINE 111.974 with CODE (494a) USA version with CODE (807) Model year 1997 with CODE (808) Model year 1998
ENGINE 112.910 /911 /912 /913 /914 /916 /917 /920 /921 /922 /923 /940 /941 /942 /943 /944 /946 /947 /949 /953 /954 /955 /970 /972 /973 /975
ENGINE 113.940 /941 /942 /943 /948 /960 /961 /963 /965 /966 /967 /968 /969
ENGINE 119.980 /981 /982 /985
ENGINE 120.982/ 983
ENGINE 137.970
Shown on model 210
The ME-SFI control unit checks its inputs and outputs for plausibility and recognizes possible faults. The identification of faults and their storing is differentiated as follows:
- Faults permanently existing
- Loose contact faults.
The diagnostic trouble code memory is erased when the vehicle battery is disconnected.
Reading out fault memory
The stored faults can only be read out and erased with the HHT or the STAR DIAGNOSIS when ignition is "ON" or when "engine running" at the diagnostic data link connector
In line with legal requirements, faults can also be read at the data link connector conforming to SAE standard, ISO 9141-2, with a generic scan tool.
Engine 120
The ME-SFI control units on the left (N3/11) and right (N3/12) feature a fault memory. All the faults together can be read out only from the right ME-SFI control unit (N3/12).
Fault recognition
- Signals above or below limit value
(open circuit in wiring, short circuit, sensors faulty)
- Frequency and duration of fault
- Illogical combination of signals
- Closed loop (e.g. lambda control) at upper or lower control stop
- Function chains with fault
- Error messages via extremely fast data bus called CAN from control unit AT, ESP or IFRCL (Engine 120: Left ME control unit)
Fault storage
Faults detected for the first time are written to the fault memory first of all as "suspected fault" together with the fault freeze frame data. If the fault is not confirmed in the subsequent driving cycle, it is erased. If the fault is confirmed, it is stored together with its fault freeze frame data.
Faults which no longer occur are erased automatically from the fault memory after max. 40 warming-up phases
Actuation of the CHECK ENGINE malfunction indicator lamp Actuation of the engine diagnosis malfunction indicator lamp with low-emission EURO3/4
The indictor lamp in the instrument cluster comes on if the fault was already stored in the last driving cycle
(
model year 1996: during the last trip
).
The "CHECK ENGINE" MIL
or engine diagnosis at low emission EURO3/4 is quenching, if in the 3 driving cycles no fault is detected (model year 1996: during the last 3 trips).
A warming-up phase is completed:
- coolant temperature at start < 35 °C
- Coolant has heated up to > 70 °C
A driving cycle (driving-cycle) is always based on an individual test and consists of
- engine start
- Individual test performed
- engine turned off.
A trip
(
model year 1996) is completed if
- all tests and function chains of exhaust-relevant faults are performed at least once since engine start
- Time after start > 20 minutes
- Engine temperature greater than -7 °C
- Engine speed > 500 rpm
Since the criterion of trip (model year 1996) has been replaced by the driving cycle (driving-cycle), faults are stored and the CHECK ENGINE indicator lamp (MIL) is actuated more rapidly.
Fault freeze frame data/operating conditions
The following data are stored if a fault is recognized:
- Fault code
- Vehicle speed
- Engine speed
- Coolant temperature
- Intake air temperature
- Intake manifold pressure
- Engine load state
- Ignition angle
- Adaptation value of mixture formation
- Status of lambda control
- Lambda control not enabled
- Lambda control enabled
- Lambda control inhibited (e.g. if fuel shut off)
- Lambda control inhibited (e.g. if fault detected)
- Lambda control without correction of O2 sensor downstream of TWC
- Further environmental conditions (e.g. fuel tank level, time after end of engine start, erase distance since last fault, erase counter readings for faults or fault frequency)
Function chains are test sequences activated by the ME-SFI control unit, e.g. for secondary air injection, exhaust gas recirculation, camshaft timing, purge system and leaktightness of evaporative emission control system.
Consequential faults
If a faulty signal is recognized and the corresponding fault code is stored, all the tests which require this signal as a comparative parameter, are ended. This ensures that no consequential faults are stored.
Emergency running
If a fault is detected, substitute values are formed. The indicator lamp in the instrument cluster only lights up, if the fault was already stored.
Readiness/function code
This code makes it possible to recognize that tests relating to fault recognition are in progress and the system is thus active. The code is set if the following tests are completed (result of test of no significance):
- Catalytic converter efficiency
- Regeneration
- Secondary air injection
- Exhaust gas recirculation
- O2 sensor upstream of TWC, signal
- O2 sensor upstream of TWC, sensor heater.
ME-SFI control unit after-running
After faults are erased, it is then necessary to wait until the processor has completed its after-running after the ignition is switched off. The time is dependent on the coolant temperature: at 80 °C approx. 4 seconds, at 20° C approx. 60 s and at -30° C approx. 150 s.
| Motor electronics control unit, location/task/design/function | GF07.61-P-5000F | ||
| Pressure sensor location/design/task/function | with air injection Engine 104 and 111 Engine 112, 113 Engine 119, 120, 137 Engine 113 with CODE 479 (cylinder shutoff) |
GF07.04-P-5014F | |
| CHECK ENGINE malfunction indicator lamp, location/task/function | GF07.13-P-3144F | ||
| Engine diagnosis malfunction indicator lamp, location/task/function | EURO3/4 (Code 925/926 or standard) | GF54.30-P-4102A | |
| ME-SFI fuel injection and ignition system diagnosis fault memory | List of all P-codes with possible causes of fault and references to remedy, Fault code descriptions with driving instructions |
||
| Engine 104 | AD07.61-P-4000C | ||
| Fault codes from P0000 to P0449 | - | ||
| Engine 104 | AD07.61-P-4000CA | ||
| Fault codes from P0450 to P1747 | - | ||
| Engine 111 | AD07.61-P-4000D | ||
| Fault codes from P0000 to P0699 | - | ||
| Engine 111 | AD07.61-P-4000DA | ||
| Fault codes from P0700 to P1747 | - | ||
| Engine 112 with ME2.0 up to 31.5.00 | AD07.61-P-4000A | ||
| Fault codes from P0000 to P0299 | - | ||
| Engine 112 with ME2.0 up to 31.5.00 | AD07.61-P-4000AA | ||
| Fault codes from P0300 to P0699 | - | ||
| Engine 112 with ME2.0 up to 31.5.00 | AD07.61-P-4000AB | ||
| Fault codes from P0700 to P1747 | - | ||
| Engine 112 with ME2.8 as of 1.6.00 | AD07.61-P-4000AC | ||
| Engine 113 with ME2.0 up to 31.5.00 | AD07.61-P-4000B | ||
| Fault codes from P0000 to P0304 | - | ||
| Engine 113 with ME2.0 up to 31.5.00 | AD07.61-P-4000BA | ||
| Fault codes from P0305 to P0743 | - | ||
| Engine 113 with ME2.0 up to 31.5.00 | AD07.61-P-4000BB | ||
| Fault codes from P0748 to P1747 | - | ||
| Engine 113 with ME2.8 as of 1.6.00 | AD07.61-P-4000BC | ||
| Engine 119 | - | ||
| refer to DMAN Engine, Volume 4 (9.5) | - | ||
| Engine 120 | AD07.61-P-4000F | ||
| Fault codes from P0000 up to P0209 | - | ||
| Engine 120 | AD07.61-P-4000FA | ||
| Fault codes from P0210 up to P0439 | - | ||
| Engine 120 | AD07.61-P-4000FB | ||
| Fault codes from P0440 up to P0799 | - | ||
| Engine 120 | AD07.61-P-4000FC | ||
| Fault codes from P0800 up to P1747 | - | ||
| Engine 137 | AD07.61-P-4000L |