1998 JAGUAR X308 Ground

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 A10
No Inspect connector EM010 for co rrosion, damage, or pushed
back pin.
Inspect ground stud EM008L for corrosion.
Repair as required, harness, splice EMS36, connector or
ground; reconnect plug(s).
GO to A11
A10: 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 A12
No Inspect connector EM014 for co rrosion, damage, or pushed
back pin.
Inspect ground stud EM008L for corrosion or damage.
Inspect harness, splice EMS36, connector or ground. Repair
as required and reconnect plug(s).
Repair as required an d reconnect plug(s).
GO to A11
A11: 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
A12: 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 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