JAGUAR X308 1998 2.G Workshop Manual

Is the voltage between 600mV and 1.0 Volt?
Yes GO to D4
No Renew O2 sensor; reconnect plug(s).
GO to D7
D4: CHECK FOR O2 SENSOR FAILURE
With the conditions held as D3, suddenly decelerate to idle. 1
Has the voltage dropped to 400mV or less ?
Yes Stop the engine
GO to D5
No Renew O2 sensor. Reconnect plug(s)
GO to D7
D5: CHECK FOR O2 SENSOR FAILURE

With the conditions held as D4, suddenly accelerate to
approximately 2500 rpm. 1
Has the voltage risen to between 600mV and 1 volt?
Yes GO to D6
No Renew O2 sensor. Reconnect plug(s).
GO to D7
D6: CHECK FOR O2 SENSOR FAILURE

With the conditions held as in D5, run the engine at 1500
rpm for approximately 3 minutes. 1
Does the displayed voltage drop below 400mV and rise above 500
mV, cycling approximately every 180 seconds?
Yes GO to D8
No Renew O2 sensor. Reconnect plug(s).
GO to D7
D7: 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
D8: 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 D9
No Inspect harness / connectors EM012 and EM022 for
corrosion, damaged / pushed back pins. Repair as required
and reconnect plug(s).
GO to D11
D9: O2 SENSOR SCREEN GROUND CONTINUITY

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

With EM012 and EM022 disconnected, measure the
resistance between EM012/022 and EM022/001. 1
Is the resistance < 0.5 OHM?
Yes GO to D17
No Inspect harness / connecto rs EM012, and EM022 for
corrosion, damaged / pushed back pins.
Repair as required an d reconnect plug(s).
GO to D21
D17: CHECK FOR SHORT TO B+