247055 Replacing DME control unit
WM 247055 Replacing DME control unit
Tools
Technical values
Information: Adaptation of the DME (DFI) control unit
Information
If the DME (DFI) control unit is replaced, it must be programmed using the PIWIS Tester II 9818. This adapts the DME (DFI) control unit to the vehicle, country version and equipment. The DME (DFI) control unit is located in the plenum panel close to the right wing.
Before the DME (DFI) control unit is removed and replaced, a read-out of the vehicle data should be obtained (if possible) using the PIWIS Tester II 9818.
The PIWIS Tester II 9818 instructions take precedence and in the event of a discrepancy these are the instructions that must be followed. Deviations may occur with later software versions.
Installation position
Information
When replacing one of the following components ]] DME (DFI) control unit and/or high-pressure pump (also when replacing the engine) [[ from the fuel system, the adaptations in the DME (DFI) control unit must be adapted to the system again.
Rough engine running is possible until the adaptations are completed.
Noticeable decreases in engine performance may also occur.
The following sequence must be followed in the correct order for the adaptation of the fuel high-pressure control system:
1. PIWIS Tester II 9818 must be connected to the vehicle and started.
2. Select vehicle type and DME/DFI control unit.
3. Select the Actual values, input signals menu and press >>.
4. Actual values B_Fuel, T_Temperature
WARNING
Test drive with the Tester connected
- Driver impeded/steers off course during test drive
- Danger to other people on the roads
-> When the Tester is connected and switched on, route the diagnostic cable so that the driver is not impeded.
-> Only get one other person to read off the values on the Tester.
-> Only drive the vehicle to achieve the rpm and speed ranges specified in the document in accordance with road traffic regulations and if the road, weather and traffic conditions are conducive to such driving.
5. Select the required items and press >> :
5.1. Engine temperature
5.2. Fuel high-pressure adaptation range 1
5.3. Fuel high-pressure adaptation range 2
5.4. Fuel high-pressure adaptation range 3
6. Start the vehicle and let the engine warm up. During the test drive, at an engine temperature of at least 55 °C, see Tester value for engine temperature, gradually approach the engine speed range of more than 2000 rpm, then switch from operation under load to overrun and maintain this operating condition for at least 5 sec. >> The leakage adaptation has now been completed. This value cannot be read out under the actual values.
Information
If it is not possible to drive at the specified speeds, the adaptation ranges 1 to 5 can also be achieved by increasing the engine load relative to the specified speed. A defined fuel throughput must be achieved for the adaptation to be completed.
The specified time stipulation of 15 sec. is cumulative, i.e. the time may also be broken down into 5 + 5 + 5 seconds, for example.
7. Fuel high-pressure adaptation range 1 must be reached: gradually approach the speed range of 60 - 85 km/h (40 - 55 mph) and maintain this for at least 15 sec. The Tester indicates when the value changes upwards or downwards by 1.00. >> This completes the adaptation of range 1.
Information
If it is not possible to drive at the specified speeds, the adaptation ranges 1 to 5 can also be achieved by increasing the engine load relative to the specified speed. A defined fuel throughput must be achieved for the adaptation to be completed.
The specified time stipulation of 15 sec. is cumulative, i.e. the time may also be broken down into 5 + 5 + 5 seconds, for example.
8. Fuel high-pressure adaptation range 2 must be completed: gradually approach the speed range of 120 - 140 km/h (75 - 90 mph) and maintain this for at least 15 sec. The Tester indicates when the value changes upwards or downwards by 1.00. >> This completes the adaptation of range 2.
9. Fuel high-pressure adaptation of range 3, 4, 5 These ranges do not need to be achieved for the adaptation drive.
9.1. Range 3 requires constant driving for 15 sec. in the speed range of 210 - 220 km/h (130 - 140 mph). >> Not required for the adaptation drive.
9.2. Range 4 requires multiple full-load acceleration, each time for approx. 10 sec. at an engine speed of more than 4000 rpm. >> Not required for the adaptation drive.
9.3. Range 5 is only for V8 turbo engines. Multiple full-load acceleration, each time for approx. 10 sec. at an engine speed of more than 5000 rpm. >> Not required for the adaptation drive.
10. Once ranges 1 and 2 have been adapted, the values must be between 0.75 and 1.25. If the values are less than 0.75 or greater than 1.25, a fault is entered in the DME (DFI) control unit. If the values are in the stipulated range, another test drive must be performed for a distance of approx. 15 km/10 miles (if feasible >> combination of motorway, cross-country and city driving). It is important that the drive includes different load and rpm ranges.
11. If range 1 and 2 are not within the stipulated range, the fault memory must be read out and the cause of the fault entries corrected.
12. Following the test drive, check the fault memory. If there are faults stored, the cause of the fault entries must be corrected.
Programming DME control unit
Teaching new DME control unit
Information
The PIWIS Tester II 9818 instructions take precedence since the description may be different with later Tester releases.
The procedure described here has been structured in general terms; different text or additions may appear in PIWIS Tester II 9818.
Information
All remote controls (keys) are required for teaching a DME, front-end electronics (front BCM), rear-end electronics (rear BCM), electronic steering lock (ELV) control unit or remote controls (keys).
Remote controls (keys) that are not taught during this teaching procedure will no longer be recognised by the vehicle.
NOTICE
Voltage drop
- Risk of irreparable damage to control unit
- Risk of damage to control unit
- Fault entries in the control unit
- Coding in the control unit is aborted
- Malfunctions in control unit, even during programming
-> Prior to disconnecting the control unit, switch off the ignition and remove the ignition key.
-> Ensure that the power supply is not interrupted during programming.
-> Connect a battery charger with a current rating of at least => Nominal value: 40 A to the vehicle battery.
1. PIWIS Tester II 9818 must be connected to the vehicle before starting the System Tester. Switch on ignition using original remote control.
2. Select the vehicle type.
3. Select DME with the cursor keys and press the >> key.
4. Select Control unit replacement with the cursor keys and press the >> key.
5. Select Read out values (vehicle data) with the cursor keys and press >>.
6. The message Values were read out appears on the Tester screen.
7. Switch off ignition and replace control unit. -> 247019 Removing and installing DME control unit - section on "Removing" 247019 Removing and installing DME control unit
8. After you have installed the new Kessy control unit, select Write values in the Control unit replacement menu to re-load the data that was read out.
9. Switch to the Programming menu.
10. Select Automatic programming and press >>.
Information
The wiper comes on once when DME programming is complete.
- Do not place any objects on the windscreen.
- Do not touch the windscreen during programming.
11. Switch ignition off and on again.
12. Go back to the Start page on the Tester.
13. Select the Online teaching function menu on the Start page.
14. Select Vehicle and press >>. Vehicle data will be read out.
15. The vehicle identification number (VIN) is displayed. Adapt the vehicle identification number if necessary.
16. Enter the repair order number and press >>.
17. Enter the PPN user name and password and press >>.
18. Login is performed.
19. The Tester displays the message Login successful. Press >>.
20. Follow the instructions on the Tester to select the required menu.
21. Once the teaching process is completed successfully, the Tester shows the following status, for example:
2 keys taught
Front BCM: taught
ELV: taught
Rear BCM: taught
DME: taught
Overall vehicle status: taught
22. >>.
23. Press EXIT to exit the Online teaching function and select the vehicle type on the Start page.
24. For the learning and adaptation routine of the throttle valve (electronic accelerator), switch the ignition off and then on again for 60 seconds without starting the engine. Do not actuate the accelerator pedal. Switch ignition off again for at least 10 seconds. Switch on ignition. This completes the adaptation of the throttle valve adjusting unit and the teaching process is complete.
25. Press F7 Read all fault memories and erase if required and delete all faults.
26. Perform DME control unit adaptation during a test drive and read out the fault memories again.