1998 JAGUAR X308 service

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 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

Pinpoint test E: P0151, P0152, P0155
Measure the insulation resistance between EM012/017 and
EM012/022. 1
Is the resistance > 10 MOHM?
Yes Reconnect all plugs
GO to D21
No Inspect harness / connector EM012, EM015 and EM022 for
corrosion, bent / pushed back pins.
Repair as required an d reconnect plug(s).
GO to D21
D21: END
Perform appropriate service drive cycle and check for the
presence of DTC. 1
Has the fault code cleared?
Yes STOP
No Contact Jaguar Service
PINPOINT TEST E : P0151, P0152, P0155
TEST CONDITIONSDETAILS/RESULTS/ACTIONS
E1: RETRIEVE DTCS
• NOTE: Battery and or ECM disconnection prior to scanning wi ll erase all data, ensure that the correct DTC is present.

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

Pinpoint test F: P0153
With EM010 and EM015 disconnected, measure the
voltage between EM010/023 and EM015/001. 1
Is the voltage B+?
Yes Remove link lead and reconnect all connectors.
GO to E18
No Check integrity of EMS fuse F1 4, EMS control relay (relay
1) is energized and all connections are made.
GO to E18
E18: END
Perform appropriate service drive cycle and check for the
presence of DTC. 1
Has the fault code cleared?
Yes STOP
No Contact Jaguar Service
PINPOINT TEST F : P0153
TEST CONDITIONSDETAILS/RESULTS/ACTIONS
F1: RETRIEVE DTCS
• NOTE: Battery and or ECM disconnection prior to scanning wi ll erase all data, ensure that the correct DTC is present.

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