XJ6Paul wrote:It's a flamenco 1994 Jaguar XJ12. 105,000 miles. Current owner has had it about 10 years and seems to have driven it and cared for it based on the items he said he's addressed over the years.
VIN ending 700xxx. It does not have the SLS. Only have a couple photos so far, but cosmetically looks promising. I'll get more details and take photos when I see it, but he claims to have put a lot of $$ into it about 4 years ago - new shocks, brakes, some suspension parts, new driver's seat leather, new paint job, and then within the last year, new injectors and oxygen sensors and tires.
Current issues: he says the check engine light comes on and has done so for a while, although it runs and drives fine. He replaced the O2 sensors and made other efforts to fix but each time it came back on. He couldn't tell me a specific code is showing up. This may be pure salesmanship BS, but he claims only the dealership can clear the codes. As I understand it, and as he explained, it's not a true OBD I or II system, right?
Could use a new headliner he says. Transmission light came on temporarily yesterday he said. It had not been driven in 3 weeks at the time. Limp mode did not kick in and shifts were normal per seller.
For what it's worth, I have experience working on a friend's 5.3L XJS (marelli ignition) and did a full tune up - dist cap, rotor, plugs, coils, wires, as well as some brake (front) and suspension work for him, and a few electrical issues. Did the silicone squirt mod to the rotor.
Anyway, I'll go shake it down and see how it looks. Priced at $3,500. Initial thoughts?
A very late car. It does sound good for the money - provided the problems it has are solvable! The V12 is a magnificent machine, no doubt about it.
I would normally wait until someone who has actually owned a V12 answered this since I have no experience of them, but since you are looking at this tomorrow, time is pressing!
Assuming the V12 fault codes are the same as the six cylinder cars, then he is not correct that only a dealer can clear the fault codes - disconnecting the battery for a few minutes will clear any codes. If they then reappear, the fault code has been triggered again.
The fault codes are displayed on the dash - when a fault code is displayed, it is shown in the 'window' where the mileage is normally displayed.
He should be able to tell you what the code is, assuming he knows how to do it. When you see the car you can display the fault code(s) yourself by pressing the Vehicle condition monitor button. This button is on the black dash binnacle round the steering wheel on the right hand side - marked 'VCM
'. It is sited together with an array of small on board computer buttons. Where the mileage is displayed will then show the fault code.
As far as I know, the fault codes are the same on the V12 as they are on the 3.2 and 4 litre
six cylinder cars. (The 3.6 is different). Hopefully a V12 owner will confirm this.
The fault codes for the six cylinder cars are:http://www.jagweb.com/aj6eng/fault_codes.phpJAGUAR 3.2 & 4.0 - LUCAS 15CU SYSTEM.
Code Display Procedure. When a fault has been detected the facia panel will display "Check Engine" warning. The relevant fault code can be identified with the vehicle stationary by using the following procedure:-
1.Switch off engine.
2.Wait 5 seconds.
3.Turn ignition switch to position 2 - do not start engine.
4.Press VCM button
5.Fault code number should be seen on VCM or trip computer display.
Fault codes can only be cleared by use of dealer JDS, PDU or similar (also to display fault codes) or by grounding the lead provided for the purpose from the ECU (see below). If more than one fault has been logged the first one must be rectified or cleared before the next will be displayed for which the above procedure must be repeated. Fault codes and related functions are listed below. 15CU Fault Codes and Functions - 3.2 and 4 litre AJ6 Engine
11.Idle pot. Looks for more than 4 volts on trim pot wire. Defaults to 2.5 volts.
12.Air flow meter. Looks for air flow meter signal less than 0.2 or more than 4.5 volts between 400 and 300 r.p.m.
14.Coolant thermistor. Looks for signal less than 0.1 or more than 4.9 volts fully warm; less than 3.54 volts after cold start; voltage change of more than 0.7 volt when fully warm.
16.Air thermistor. Looks for signal less than 0.1 or more than 4.9 volts.
17.Throttle pot. Looks for signal less than 0.25 volts.
18.Throttle pot/airflow meter signal conflict. Looks for throttle pot signal above 2.25 volts while AF signal indicates light load. Defaults to ignore throttle pot signal above 1.5 volts therefore open loop operation with full load enrichment is disabled.
19.Throttle pot/airflow meter signal conflict. Looks for closed throttle signal while AF signal indicates high load with speed above 1000 r.p.m. Defaults to ignore closed throttle signal therefor idle functions are disabled.
22.Fuel pump drive circuit. Checks for short or open circuit to pump relay.
23.Lambda sensor error - fuelling rich. Feedback signal high despite correcting weak by more than 12.5%.
24.Ignition drive circuit. Checks that ignition drive pulse exceeds 4.5 volts and is below 0.1 volts with no pulse.
26.Lambda sensor error - fuelling weak. Feedback signal low despite correcting rich by more than 12.5%.
29.ECU self test. Program data checksum wrong - corrupted.
33.Injector drive circuit fault. Checks that injector voltage during initial turn on period (1.3 milliseconds) does not exceed 1.2 volts.
34.Injector drive fault or injector dribble. Checks that feedback sensor is not indicating rich fuelling during over-run cut off above 2000 r.p.m.
37.EGR circuit check. Checks voltage across EGR valve for open or short circuit.
39.EGR temp sensor check. Looks for conflict between EGR temperature sensor reading and state (i.e. open/closed) of EGR valve. Disables EGR by default.
44.Oxygen sensor circuit check. Looks for absence of feedback signal. Also if weak fuelling error cannot be corrected by up to 12.5% enrichment, enrichment of 37.5% is applied and fault flagged if no corrective response is detected. Defaults to open loop operation.
46.Idle speed control valve coil 1. Checks that off voltage is less than 0.85 volts and on voltage exceeds 12.25 volts.
47.Idle speed control valve coil 2. Checks that off voltage is less than 0.85 volts and on voltage exceeds 12.25 volts.
48.Idle speed control valve error. Looks for idle speed being too high with valve closed (coolant temp below 35C) or too low with valve open (coolant temp above 75C).
66.Air injection relay drive circuit. Looks at voltage across relay to detect open or short circuit.
68.Road speed sensor. Looks for conflicting speed signal (less than 1.5 m.p.h.) with engine speed above 2800 r.p.m. and AF signal above 3 volts, with transmission not in neutral.
69.Drive/neutral gear selection error. Looks for engine start when D or N not selected, or for engine speed above 3550 r.p.m. and high load signal when D or N are selected.
89.Purge valve circuit. Looks at voltage across purge valve winding to detect open or short circuit.
Because codes 26 and 44 can be activated by running out of fuel they only display once until the next ignition on/off event