Jaguar XJ (X350). Manual — part 825

Onboard refuel vapor recovery (ORVR).

The vehicle is fitted with an onboard refuel vapor recovery (ORVR) type fuel tank. During refuelling all

vapor is collected in the evaporative emission canister as well as in normal vehicle operations.

When the evaporative emission canister purge valve is closed, the fuel tank is vented into the

evaporative emission canister through the fuel tank roll-over valve. The evaporative emission

canister absorbs the fuel vapor and prevents the release of hydrocarbons into the atmosphere.

When the vapor evaporative emission canister purge valve is opened, the canister is exposed to the

intake manifold vacuum and the fuel vapor deposits are drawn into the manifold where they mix

with the incoming air/fuel charge.

The evaporative emission fuel vapor management system is controlled by the engine control module

(ECM) according to calibrated data tables.

Diagnosis and testing

Evaporative Emissions - VIN Range:
G00442->G45703

Preliminary Inspection

1 . Visually inspect for obvious signs of mechanical or electrical damage, blown fuses, etc.

2 . If an obvious cause for an observed or reported concern is found, correct the cause (if possible)

before proceeding to the next step.

3 . If the concern is not visually evident, verify the symptom and proceed with diagnosis, using the

Jaguar approved diagnostic system, where available.

4 . Where K-Line or Vacutec equipment is available, it should be used as an aid to diagnosis. The

equipment must be capable of testing to the 0.020 thou standard.

Diagnostic Drive Cycles

Following the setting of a DTC, the appropriate repairs must be carried out, and the normal operation

of the system checked. This will be done by performing a series of drive cycles which will enable the

vehicle to operate the evaporative emissions system as a function check. The following drive cycles

cover the use of the Jaguar approved diagnostic system, a scan tool, and a test with no additional

equipment, where possible.

Flow check monitor drive cycle conditions (non-Federal)

NOTE:

These conditions must be satisfied before the test is commenced.

This drive cycle should be performed following rectification work on the system.

Make sure the fuel tank is between one third and three quarters full. (Adding fuel will increase

vapor generation; the diagnostic will not run if the vapor concentration is too great).

Make sure the ambient air temperature is above -5°C (23°F).

Flow check monitor drive cycle (non-Federal)

Drive the vehicle for a minimum of 15 minutes, avoiding severe or excessive fuel movement.

Avoiding excessive fuel movement, gently bring the vehicle to rest (coast to a stop).

Allow the vehicle to idle for two minutes.

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Full Evaporative system monitor drive cycle conditions

NOTE:

These conditions must be satisfied before the test is commenced.

Make sure the fuel filler cap is correctly fitted.

Clear the DTCs. (Perform a code clear, even if no codes are present. This will reset TIDs).

Make sure the fuel tank is between one third and three quarters full (adding fuel will increase

vapor generation; the diagnostic will not run if the vapor concentration is too great).

Drive the vehicle for a minimum of two minutes, and until fully warm (temperature gauge just

below mid-point).

Make sure that the purge valve is operating, either by touch, sound, or using datalogger (purge

vapor management valve-duty cycle). If the purge is not active, perform the "drive cycle for
green ECM" in this section.

Full Evaporative system monitor drive cycle

Drive the vehicle to a suitable road where the test can be carried out, switch off the ignition.

Leave the ignition switched off for 30 seconds.

Restart the engine, accelerate briskly to 80 kilometers per hour (50 miles per hour), making sure

that the engine speed reaches at least 3500 rpm for a minimum of five seconds.

40 thou test, using the Jaguar approved diagnostic system

Avoiding high engine loads, drive the vehicle steadily between 64 and 97 kilometers per hour (40

and 60 miles per hour). Using the Jaguar approved diagnostic system, monitor the
evaporative valve duty cycle (purge vapor management valve-duty cycle), CCV status
(canister close valve-vapor recovery system), and the FTPS (fuel tank pressure-vapor
recovery system). The Jaguar approved diagnostic system will give an indication when the
test is active. Dependant on the level of vapor concentration, it may take up to 30 minutes
for the test to initialize. (Vapor concentration cannot be measured using the Jaguar approved
diagnostic equipment). When the test has initialized (CCV closed), it will take up to 90
seconds to complete. Avoid excessive fuel movement while the test is active.

20 thou test, using the Jaguar approved diagnostic system

Continue driving the vehicle steadily between 64 and 97 kilometers per hour (40 and 60 miles per

hour) avoiding high engine loads for a further 10 minutes.

Avoiding excessive fuel movement, gently bring the vehicle to rest (coast to a stop).

Allow the vehicle to idle for 2 minutes.

Use the Jaguar approved diagnostic system to monitor the evaporative valve duty cycle (purge

vapor management valve-duty cycle), CCV status (canister close valve-vapor recovery
system), and the FTPS (fuel tank pressure-vapor recovery system). The Jaguar approved
diagnostic system will give an indication when the test is active. When the test has initialized
(CCV closed), it will take up to 90 seconds to complete.

If the 20 thou test has not run, it is likely that the vapor concentration in the purge system is too

great. In this case, carry out the following:

Drive the vehicle steadily for a further 30 minutes, avoiding excessive fuel movement.

Avoiding excessive fuel movement, gently bring the vehicle to rest (coast to a stop).

Allow the vehicle to idle for 2 minutes.

Use the Jaguar approved diagnostic system to monitor the evaporative valve duty cycle (purge

vapor management valve-duty cycle), CCV status (canister close valve-vapor recovery
system), and the FTPS (fuel tank pressure-vapor recovery system). The Jaguar approved
diagnostic system will give an indication when the test is active. When the test has initialized
(CCV closed), it will take up to 90 seconds to complete.

If the 20 thou test fails to run a second time, repeat the entire test.

Check for DTCs. Rectify as indicated.

40 thou test, using scan tool

Avoiding high engine loads, drive the vehicle steadily between 64 and 97 kilometers per hour (40

and 60 miles per hour).

When the test has initialized, using the scan tool, monitor the evaporative valve duty cycle, CCV

status, and the FTPS (the scan tool should give an indication when the test is active).

When the test has initialized (CCV closed), it will take up to 90 seconds to complete.

To make sure that the test has completed, TID 08 in mode 6 must be checked (if the test has not

completed, this TID will display 0. Any other value indicates test completion).

If the test did not complete, repeat the test.

20 thou test, using scan tool

Continue driving the vehicle steadily between 64 and 97 kilometers per hour (40 and 60 miles per

hour) avoiding high engine loads for a further 10 minutes.

Avoiding excessive fuel movement, gently bring the vehicle to rest (coast to a stop).

Allow the vehicle to idle for 2 minutes.

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