1998 JAGUAR X308 Ground

With EM023 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 E9
No Renew the O2 sensor and reconnect plug(s)
GO to E8
E8: 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
E9: 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 E10
No Inspect harness / connector EM010 for corrosion, damage,
or pushed back pin.
Inspect ground stud EM008L for corrosion or damage.
Inspect harness / spli ce EMS36 for damage.
Repair as required an d reconnect plug(s).
GO to E11
E10: 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 E12
No Inspect harness / connector EM014 for corrosion, damage,
or pushed back pin.
Inspect ground stud EM008L for corrosion or damage.
Inspect harness / spli ce EMS36 for damage.
Repair as required an d reconnect plug(s).
GO to E11
E11: 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
E12: CHECK FOR HEATED O2 SENSOR CONTINUITY

With EM012 and EM023 disconnected, measure the
resistance between EM012/014 and EM023/003. 1
Is the resistance < 0.5 OHM?
Yes GO to E13
No Inspect harness / connecto rs EM012, and EM023 for
corrosion, damaged / pushed back pins.
Repair as required an d reconnect plug(s).
GO to E18
E13: HEATED O2 SENSOR SCREEN GROUND CONTINUITY

Yes GO to F7
No Renew O2 sensor. Reconnect plug(s)
GO to F8
F7: CHECK FOR O2 SENSOR FAILURE
With the conditions held as in F6, 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 F9
No Renew O2 sensor. Reconnect plug(s)
GO to F8
F8: 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
F9: HEATED O2 SENSOR SHORT CIRCUIT TO GROUND

With EM023 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 F11
No Renew the O2 sensor and reconnect plug(s).
GO to F10
F10: 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
F11: 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 F12
No Inspect harness / connector EM010 for corrosion, damage,
or pushed back pin.
Inspect earthing stud EM008L for corrosion or damage.
Inspect harness / spli ce EMS36 for damage.
Repair as required an d reconnect plug(s).
GO to F13
F12: 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 F14
No Inspect harness / connector EM014 for corrosion, damage,
or pushed back pin.
Inspect earthing stud EM008L for corrosion or damage.
Inspect harness / spli ce EMS38 for damage.
Repair as required an d reconnect plug(s).
GO to F13
F13: CHECK FOR HEATED O2 SENSOR CONTINUITY