Ground JAGUAR X308 1998 2.G Workshop Manual

With EM012 and EM021 disconnected, measure the
resistance between EM012/015 and EM021/003 1
Is the resistance < 0.5 OHM?
Yes GO to A13
No Inspect harness / connecto rs EM012, and EM021 for
corrosion, damaged / pushed back pins. Repair as required
and reconnect plug(s).
GO to A18
A13: HEATED O2 SENSOR SCREEN GROUND CONTINUITY

GO to B7
No Renew O2 sensor, reconnect plug(s).
GO to B8
B7: CHECK FOR O2 SENSOR FAILURE
With the conditions held as in B6, run the engine at 1500
rpm for approximately 2 minutes. 1
Does the displayed voltage drop below 400mV and rise above 500 mV, cycling approximately every 4 seconds?
Yes GO to B9
No Renew O2 sensor, reconnect plug(s).
GO to B8
B8: STOP
Perform appropriate service drive cycle and check for the
presence of DTC. 1
Has the fault code cleared?
Yes STOP
No Contact Jaguar Service
B9: HEATED O2 SENSOR SHORT CIRCUIT TO GROUND

With EM021 disconnected measure the insulation resistance
between sensor pin 001 and sensor body. 1
Repeat for pin 003 and sensor body. 2
Is the resistance > 10 MOHM?
Yes GO to B11
No Renew the O2 sensor and reconnect plug(s).
GO to B10
B10: STOP
Perform appropriate service drive cycle and check for the
presence of DTC. 1
Has the fault code cleared?
Yes STOP
No Contact Jaguar Service
B11: SIGNAL GROUND 1 CONTINUITY

With EM010 and EM014 disconnected, measure the
resistance between EM010/023 and chassis ground EM008L. 1
Is the resistance < 0.5 OHM?
Yes GO to B12
No Inspect connector EM010 for co rrosion, damage, or pushed
back pins.
Inspect earthing stud EM008L for corrosion.
Inspect harness, splice EMS36.
Repair as required an d reconnect plug(s).
GO to B13
B12: SIGNAL GROUND 2 CONTINUITY

With EM010 and EM014 disconnected, measure the
resistance between EM014/004 and chassis ground EM008L. 1
Is the resistance < 0.5 OHM?
Yes GO to B14
No Inspect connector EM014 for co rrosion, damage, or pushed
back pins.
Inspect earthing stud EM008L for corrosion.
Inspect harness, splice EMS36.
Repair as required an d reconnect plug(s).
GO to B13
B13: CHECK FOR HEATED O2 SENSOR CONTINUITY

With EM012 and EM021 disconnected, measure the
resistance between EM012/015 and EM021/003. 1
Is the resistance < 0.5 OHM?
Yes GO to B14
No Inspect harness / connectors EM012 and EM021 for
corrosion, damaged / pushed back pins. Repair as necessary
and reconnect plug(s).
GO to B19
B14: HEATED O2 SENSOR SCREEN GROUND CONTINUITY

With EM012 and EM022 disconnected, measure the
resistance between EM012/017 and EM022/002. 1
Is the resistance < 0.5 OHM?
Yes GO to C8
No Inspect harness / connectors EM012 and EM022 for
corrosion, damaged / pushed back pins. Repair as necessary
and reconnect plug(s).
GO to C10
C8: O2 SENSOR SCREEN GROUND CONTINUITY

With EM012 and EM022 disconnected, measure the
resistance between EM012/022 and EM022/001. 1
Is the resistance < 0.5 OHM?
Yes GO to C9
No Inspect harness / connectors EM012 and EM022 for
corrosion, damaged / pushed back pins.
Inspect harness / splice EM S08 for damage. Repair as
necessary and reconnect plug(s).
GO to C10
C9: O2 SENSOR SHORT CIRCUIT TO GROUND

With EM022 disconnected measure the insulation resistance
between sensor pin 001 and sensor body. 1
Repeat for pin 002 and sensor body. 2
Is the resistance > 10 MOHM?
Yes GO to C11
No Renew the O2 sensor and reconnect all plugs.
GO to C10
C10: STOP
Perform appropriate service drive cycle and check for the
presence of DTC. 1
Has the fault code cleared?
Yes STOP
No Contact Jaguar Service
C11: SIGNAL GROUND 1 CONTINUITY

With EM010 and EM014 disconnected, measure the
resistance between EM010/023 and chassis ground EM008L. 1
Is the resistance < 0.5 OHM?
Yes GO to C12
No Inspect harness / connector EM010 for corrosion, damage, or
pushed back pin.
Inspect ground stud EM008L for damage or corrosion.
Inspect harness / spli ce EMS36 for damage.
Repair as necessary and reconnect plug(s).
GO to C13
C12: SIGNAL GROUND 2 CONTINUITY