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Home >> Jaguar >> 2002 >> XJR Base >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Servicing >> Descriptions & Operation >> Transmission Control Module (TCM) >> Emergency Running (electronic Limp-Home Mode)
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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:

  1. Select "P".
  2. Switch OFF the ignition.
  3. Wait 10 seconds.
  4. Start the engine.
  5. Select "R" (reverse will be selected).
  6. 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.