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2001 Jaguar XJ8 Failsafe engine mode no ASC

Tiny
MACHRI
  • MEMBER
  • 2001 JAGUAR XJ8
  • V8
  • 2WD
  • AUTOMATIC
  • 80,000 MILES
Car has gone into failsafe mode/gearbox problem and then seemed to repair itself after switching off for some time. Car has been with dealer to repair with new catalyytic converters up stream and downstream lambda sensors fitted at major cost.
The problem has again occurred sporadically several times and after leaving it with dealer they could not find any fault and returned it to me.
Some months later this problem has again reared its head
but this time the problem has not cured itself.
PLEASE HELP!
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Thursday, July 23rd, 2009 AT 4:57 PM

1 Reply

Tiny
DAVE H
  • MECHANIC
  • 13,383 POSTS
FAULT MONITORING/DIAGNOSTICS
The TCM constantly monitors the transmission system for faults. In the event of a fault occurring, the transmission is protected by a limp home mode. This mode allows use of P, R, N, and 4. It also signals the ECM to switch on the CHECK ENG (MIL) lamp. The TCM is able to diagnose faults in components which affect exhaust emissions. Communication with the PDU is through the J1962 connector which allows accurate diagnosis of transmission problems. Additional diagnostic functions facilitate fast repair of faults. All transmission OBDII information is stored for future data analysis in the ECM.
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Sunday, July 26th, 2009 AT 7:36 AM

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