2001 Jaguar XJ8 Failsafe engine mode no ASC

2001 JAGUAR XJ8
80,000 MILES • V8 • 2WD • AUTOMATIC
Avatar
MACHRI
  • MEMBER
  • 1 POST
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!!!
Jul 23, 2009 at 9:57 AM
Avatar
DAVE H
  • ✓Experienced Mechanic
  • 13,384 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.
Jul 26, 2009 at 12:36 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle