1998 JAGUAR X308 Ground

With EM012 and EM022 disconnected, measure the
resistance between EM012/022 and EM022/001. 1
Is the resistance < 0.5 OHM?
Yes GO to D10
No Inspect harness / connectors EM012 and EM022 for
corrosion, damaged / pushed back pins.
Inspect harness / splice EMS008 for damage.
Repair as required an d reconnect plug(s).
GO to D11
D10: 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 D12
No Renew the O2 sensor and reconnect all plugs.
GO to D11
D11: 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
D12: 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 D13
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 D14
D13: 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 D15
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 D14
D14: 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
D15: CHECK FOR O2 SENSOR 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 D16
No Inspect harness / connectors EM012 and EM022 for
corrosion, damaged / pushed back pins.
Repair as required an d reconnect plug(s).
GO to D21
D16: O2 SENSOR SCREEN GROUND CONTINUITY

Measure the voltage between EM010/023 and EM012/022. 1
Is the voltage 0V?
Yes GO to D19
No Inspect harness / connectors EM010, EM012 and EM022 for
corrosion, damaged / pushed back pins.
Repair as required an d reconnect plug(s).
GO to D21
D19: CHECK HARNESS SHORT TO GROUND

With EM010 and EM012 and EM022 disconnected, measure
the insulation resistance between EM012/017 and ground
EM010/023. 1
Is the resistance > 10 MOHM?
Yes GO to D20
No Inspect harness / connector EM012, EM022 for corrosion,
bent / pushed back pins.
Repair as required an d reconnect plug(s).
GO to D21
D20: CHECK HARNESS SHORT CORE TO CORE

With the conditions held as E4, suddenly accelerate to
approximately 2500 rpm. 1
Has the voltage risen to between 600mV and 1 volt?
Yes GO to E7
No Renew O2 sensor; reconnect plug(s)
GO to E6
E6: 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
E7: HEATED O2 SENSOR SHORT CIRCUIT TO GROUND