51 - Transmission Slips or Gear Implausible

P0701

51 Transmission Slips or Gear Implausible

Checks are carried out to ascertain whether a gear is implausible or the transmission slips.

NOTE: The redundancy transistor is switched off. The setpoint values of the current regulator are set to 0 and all change-over valves are switched off. The control module is then in emergency operation. Minimal cycle is additionally activated.

Diagnosis conditions
- Ignition on
- No active gearshift
- No speed n2 fault
- Engine speed n2 > 150 rpm
- No selector lever fault
- No CAN fault
- No PSM fault
- At least one plausible rear wheel speed
- All plausible PSM wheel speeds > 50 rpm
- Difference between right and left wheel speed < 100 rpm (rear and front)
- Output shaft speed > 180 rpm
- Engine speed > 450 rpm

Possible fault cause
- Leak in hydraulic wiring
- Leak in mechanical transmission parts
- Oil filter missing

Affected terminals
- (none)

Diagnosis/troubleshooting

Work Instruction: