Emergency Running (electronic Limp-Home Mode)
The TCM constantly monitors the transmission for faults. In the event of a problem the TCM will adopt the limp-home mode, in which the gear currently held remains engaged, until P is selected. The modulating and shift pressures will increase to maximum and converter lock-up will be inhibited.
Following the selection of "P" , the only ratios available will be 2 (irrespective of forward ratio manual selection) and "R".
With the vehicle at rest, the procedure to manually select is as follows:
- Select "P".
- Switch OFF the ignition.
- Wait 10 seconds.
- Start the engine.
- Select "R" (reverse will be selected).
- Select "D" ( 2 will be selected).
The limp-home mode will be retained until the fault is remedied or the fault code has been erased. Intermittent faults may be cleared by cycling the ignition OFF/ON. In certain cases the component may need to be operated before the fault code is cleared eg. a shift solenoid.