sensor JAGUAR X308 1998 2.G Workshop Manual

With the conditions held as G2, suddenly decelerate to idle. 1
Has the voltage dropped to 400mV or less ?
Yes GO to G4
No Renew O2 sensor and reconnect plug(s).
GO to G6
G4: CHECK FOR O2 SENSOR FAILURE

With the conditions held as G3, suddenly accelerate to
approximately 2500 rpm. 1
Has the voltage risen to between 600mV and 1 volt?
Yes GO to G5
No Renew O2 sensor and reconnect plug(s).
GO to G6
G5: CHECK FOR O2 SENSOR FAILURE

With the conditions held as in G4, 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 G7
No Renew O2 sensor and reconnect plug(s).
GO to G6
G6: 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
G7: CHECK FOR O2 SENSOR CONTINUITY

With EM012 and EM024 disconnected, measure the
resistance between EM012/016 and EM024/002. 1
Is the resistance < 0.5 OHM?
Yes GO to G8
No Inspect harness / connecto rs EM012, and EM024 for
corrosion, damaged / pushed back pins.
Repair as required an d reconnect plug(s).
GO to G10
G8: O2 SENSOR SCREEN GROUND CONTINUITY

With EM012 and EM024 disconnected, measure the
resistance between EM012/022 and EM024/001. 1
Is the resistance < 0.5 OHM?
Yes GO to G9
No Inspect harness / connecto rs EM012, and EM024 for
corrosion, damaged / pushed back pins.
Repair as required an d reconnect plug(s).
GO to G10
G9: O2 SENSOR SHORT CIRCUIT TO GROUND

With EM024 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 G11
No Renew the O2 sensor and reconnect all plugs.
GO to G10
G10: 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
G11: 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 G14
No Inspect connector EM014 for co rrosion, 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 G13
G13: 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
G14: CHECK FOR O2 SENSOR CONTINUITY

With EM012 and EM024 disconnected, measure the
resistance between EM012/016 and EM024/002. 1
Is the resistance < 0.5 OHM?
Yes GO to G15
No Inspect harness / connecto rs EM012, and EM024 for
corrosion, damaged / pushed back pins.
Repair as required an d reconnect plug(s).
GO to G20
G15: O2 SENSOR SCREEN GROUND CONTINUITY

Conne
ct the scan tool
1
Have the DTC(s) and fr

eeze
frame data been recorded?
Yes GO to H2
H2: CHECK
FOR LOW EXHAUST TEMPERATURE
Chec

k the engine and exhaust
system for correct operation
and normal running temperature
1
Is th
e engine and exhaust system operating correctly and up to
normal running temperature?
Yes GO to H3
No Rectify leaking exhaust manifold / catalyst, general causes of
an over rich mixture and engine cooling system operation and
test the system for correct operation.
GO to H7
H
3: CHECK FOR O2 SENSOR FAILURE
I

gnition switch to position 0
1
Di

sconnect EM024
Bracket on top o

f gearbox or
Bulkhead rear of engine
2
R
un the engine for a period to
warm the sensor and then
maintain a steady speed of approximately 2500 rpm.
3
W
ith EM024 disconnected, measure the voltage between
EM024/001 and EM024/002.
4
Is
the voltage between 600mV and 1.0 Volt?
Yes GO to H4
No Renew O2 sensor. Reconnect plug(s).
GO to H7
H
4: CHECK FOR O2 SENSOR FAILURE

With
the conditions held as H3, suddenly decelerate to idle.
1
Has the voltage
d
ropped to 400mV or less ?
Yes Stop the engine
GO to H5
No Renew O2 sensor. Reconnect plug(s).
GO to H7
H5
: CHECK FOR O2 SENSOR FAILURE
Wi
th
the conditions held as H4, suddenly accelerate to
approximately 2500 rpm.
1
Has the
voltage risen to between 600mV and 1 volt?
Yes GO to H6
No Renew O2 sensor. Reconnect plug(s).
GO to H7
H6
: CHECK FOR O2 SENSOR FAILURE
W
i
th the conditions held as in H5, run the engine at 1500
rpm for approximately 3 minutes.
1
Does th e displayed voltage drop below 40
0mV and rise above 500
mV, cycling approximately every 180 seconds?
Yes