Code36 fuel fail bank B
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Don B (09-14-2017)
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Hi jagnut,
Note that the document frenchfairplaydriver posted is the Technical Introduction, not the Workshop Manual.
As far as I know, the full XJ40/XJ81 Workshop Manual is still only available from the Jaguar Daimler Heritage Trust on DVD-ROM, or possibly on eBay in paper form. I haven't found it online as a free pdf download, but you might search to see if a scan has been uploaded by someone.
The engine Service Manual can be downloaded here, although as always it assumes a lot of basic Jaguar engine knowledge:
Jaguar 6.0L V12 Service Manual
Another helpful reference is the Haynes XJ40 Repair Manual, which applies to most of the systems on your car with the exception of the engine and transmission:
Haynes XJ40 Repair Manual
Since XJ81s are less common than XJS V12s, you might search the XJS forum for FF36 and Code 36. For example:
https://www.jaguarforums.com/forum/x...e-light-65172/
Also this:
https://forums.jag-lovers.com/t/v12-...hey-are/134977
Cheers,
Don
Last edited by Don B; 09-14-2017 at 09:58 AM.
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#6
Code 36 on your engine is telling you there is some kind of circuit fault detected by the Fueling ECU in the B-Bank Injector circuits. That can be a cut/chafed/shorted/grounded wire, a fault in an injector itself, or a fault in the Power Resistors to that Bank. Just anything in the actual wiring and components controlling the LH row of injectors. Attached is a manual section for your engine.
Good luck!
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frenchfairplaydriver (09-14-2017)
#7
CODE 36
Hello and thanks for the information and downloads. I found a vacuum leak at the air injection rail.The rubber hoses that connect to each bank. One of the hoses had a split on the underside. Perhaps this is the problem? I have replaced and cleared code.I will report back in a day or so and see if this the culprit.Thanks for the suggestions any help. By the way , which is A-bank and which is B-bank? Thanks
Last edited by jagnut; 09-14-2017 at 03:03 PM.
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Don B (09-14-2017)
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How to test a lambda probe?
A lambda probe (O2 probe) is an automotive sensor, the purpose of which is to measure the level of dioxygen in the exhaust gases.
The lambda sensor is usually placed on the exhaust pipe between the exhaust manifold and the catalytic converter.
The measurement returned by the probe allows the computer to determine the proportion of the air-fuel mixture for which the efficiency of the engine will be optimal, with the aim of reducing pollution as well as consumption.
On recent vehicles (compatible with EURO-3 and E-OBD), in addition to this ("upstream") probe, a second probe is placed downstream of the catalytic converter, making it possible to evaluate the efficiency of this pot in time real.
The probes are subjected to very high temperatures, and sooner or later they break down.
In general, the failure results in the appearance of a warning light on the dashboard. There may be no other symptoms, depending on the vehicle; but on some, an increase in consumption and a decrease in nervousness are felt.
Test a Lambda probe
To test a lambda probe, you must have a multimeter that has the ohmetre function. I advise you a quality multimeter, for example of the brand Fluke. After disconnecting the probe, you will find that it generally has 4 wires. Locate the two wires of the same color, and test the continuity between the two pins corresponding to these wires. You must find a value between 5 and 7 ohms. Outside this range of values, your probe is most likely out of service.
A lambda probe (O2 probe) is an automotive sensor, the purpose of which is to measure the level of dioxygen in the exhaust gases.
The lambda sensor is usually placed on the exhaust pipe between the exhaust manifold and the catalytic converter.
The measurement returned by the probe allows the computer to determine the proportion of the air-fuel mixture for which the efficiency of the engine will be optimal, with the aim of reducing pollution as well as consumption.
On recent vehicles (compatible with EURO-3 and E-OBD), in addition to this ("upstream") probe, a second probe is placed downstream of the catalytic converter, making it possible to evaluate the efficiency of this pot in time real.
The probes are subjected to very high temperatures, and sooner or later they break down.
In general, the failure results in the appearance of a warning light on the dashboard. There may be no other symptoms, depending on the vehicle; but on some, an increase in consumption and a decrease in nervousness are felt.
Test a Lambda probe
To test a lambda probe, you must have a multimeter that has the ohmetre function. I advise you a quality multimeter, for example of the brand Fluke. After disconnecting the probe, you will find that it generally has 4 wires. Locate the two wires of the same color, and test the continuity between the two pins corresponding to these wires. You must find a value between 5 and 7 ohms. Outside this range of values, your probe is most likely out of service.
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frenchfairplaydriver (09-18-2017)
#14
#15
FF36
well that didn't help ...the ff36 is back on....driving me nuts...performance seems normal...I have ohmned injectors ok within specs....I can hear injector click when running all seem the same...looked at each injector connector clean and tight..is there a way to pull injector rails and watch the fuel spray patterns? I know I will have to kill spark. do you think this is worthwhile exercise? Back at it again...feel like I am going in circles thanks for anymore help. The vehicle is a 1994 LWB XJ12 (x81) with Marelli distributor. 6.0l. Thanks
Last edited by jagnut; 10-04-2018 at 11:23 AM. Reason: Information
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jagnut (10-04-2018)
#17
fuel fail 36
Hello again I think I am getting closer to the issue. I checked to see if the O2 sensors heaters are working. When I tested them I could only see 3 volts to either. Is there something I am missing? With ignition on and checking the third wire for battery voltage it only shows 3 volts. Hooking the wires back up and starting the car I pulled the o2 sensor relay on the firewall and the car shut down. Could the relay be bad and only passing 3 volts to the heaters? Any comments greatly appreciated
#18
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Don B (01-05-2019),
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