1998 JAGUAR X308 sensor

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

Connect the scan tool 1
Have the DTC(s) and freeze frame data been recorded?
Yes GO to E2
E2: CHECK O2 SENSOR HEATER CONTINUITY
Ignition switch to position 0 1
Disconnect EM023
Bracket on top of gearbox or Bulkhead rear of engine
2
Measure the resistance between EM023/001 and
EM023/002. 3
Is the resistance between 4 and 10 OHM?
Yes
GO to E3
No Renew O2 sensor. Reconnect plug(s)
GO to E7
E3: CHECK FOR O2 SENSOR FAILURE

Run the engine for a period to warm the sensor and then
maintain a steady speed of approximately 2500 rpm. 1
With EM023 disconnected, measure the voltage between
EM023/003 and EM023/004. 2
Is the voltage between 600mV and 1.0 Volt?
Yes
GO to E4
No Renew O2 sensor. Reconnect plug(s)
GO to E7
E4: CHECK FOR O2 SENSOR FAILURE

With the conditions held as E3, suddenly decelerate to
idle. 1
Has the voltage dropped to 400mV or less ?
Yes GO to E5
No Renew O2 sensor. Reconnect plug(s)
GO to E7
E5: CHECK FOR O2 SENSOR FAILURE

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

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 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