1 | Fault code | |
2 | Fault storage Activation of malfunction indicator lamp for engine diagnosis (EURO3/4) or CHECK ENGINE (MIL) | after the end of the test period and faults after two successive driving cycles with faults |
3 | Frequency of the test | continuous |
4 | Checked signal or status | Calculated gear ratios outside tolerance |
5 | Fault setting conditions Permissible deviation from respective gear ratio Test duration |
-0.20 to 0.20 1st/2nd gear -0.05 to 0.05 3rd gear -0.03 to 0.03 4th/5th gear -0.20 to 0.20 Reverse gear approx. 2 s |
6 | Test prerequisites | - engine speed greater than 400 rpm - output shaft rotational speed greater than 180 rpm (corresponds to approx. 20 km/h) - no shift operation |
7 | Test sequence | If no shift operation is being performed, the ETC control module detects the engaged gear from the gear ratio. If the gear ratio is outside the tolerance or the gear detection is implausible, the modulating pressure is adjusted to its highest value after approx. 0.5 s. If the gear ratio remains outside the tolerance or the gear detection remains implausible, fault identification takes place after approx. 1 s. |
8 | | The gear ratios are calculated from the following variables: speed signal n2, speed signal n3 and output shaft rotational speed (determined via rear wheel speed). Faults are detected by the ETC control module and sent via the CAN data bus to the ME-SFI control module. The faults are stored and the malfunction indicator lamp is activated by the ME-SFI control module. Also read out ETC diagnostic trouble code memory, fault code 51. |