Diagnostic Mode d:2
Diagnosis of odometer frequency sensor and fuel consumption signal requires board computer to be in diagnostic mode 2.
The clock display shows "d : 2".
The function display shows "S-E-".
| The level condition of the odometer frequency sensor is indicated behind the "S", the level condition of the fuel consumption signals is indicated behind the "E". | Fehler! Datei kann nicht geöffnet werden! | ||
|---|---|---|---|
| .P. C6055.tif | 9 | 7,5 | tiff;; |
| Sensor/signal | Operating condition | Display behind the | |
| "S" | "E" | ||
| Odometer | Speed < approx. 9 km/h (6 mph) | - | |
| frequency sensor | |||
| Speed > approx. 13 km/h (8 mph) | ( ) | ||
| Injection signal | Engine speed < approx. 800/min | - | |
| from control unit | |||
| Engine speed > approx. 1200/min | ( ) |
Test Program - Odometer Frequency Sensor and Fuel Consumption Signal
| Fault | Trouble-shooting |
|---|---|
| Display behind the "S" | 1. Voltage supply lacking at odometer frequency sensor P14/Ter. 1. |
| does not change from | 2. Lead interruption from odometer frequency sensor P14/Ter. 3 to ground. |
| "-" to "( )" even at | 3. Lead interruption or short circuit to ground of lead between board computer |
| higher speeds | U2/Ter. 21 and odometer frequency sensor P14/ Ter. 2. |
| 4. Short circuit to ground of lead between odometer frequency sensor P14/Ter. 2 | |
| and an electronic system also receiving this signal, e.g. LCD instrument, electron. | |
| speedometer, Motronic, electron. temperature control, automatic transmission, | |
| electron. cruise control, radios with speed-dependent volume control, electron. | |
| controlled chassis damping | |
| 5. Odometer frequency sensor defective | |
| 6. Wrong program memory installed (see table 7.1) | |
| 7. Board computer defective | |
| Display behind the "E" | 1. Lead interruption between board computer U2/Ter. 24 and control unit |
| does not change from | 2. Lead interruption between board computer U2/Ter. 6 and fuel pump relay |
| "-" to "·" even at | K68/Ter. 87 or 87 |
| higher speeds | 3. Wrong program memory installed |
| 4. Board computer defective | |
| Note: On some injection systems, "( )" is not displayed due to the de-bouncing | |
| provided in the board computer. | |
| In this case, the de-bouncing can be switched off by actuating one of the two | |
| hole contacts. | |
| The display must then continuously alternate between "( )" and "-". |