1998 JAGUAR X308 sensor

With EM012 and EM023 disconnected, measure the
resistance between EM012/014 and EM023/003. 1
Is the resistance < 0.5 OHM?
Yes GO to F14
No Inspect harness / connectors EM012 and EM023 for
corrosion, damaged / pushed back pins.
Repair as required an d reconnect plug(s).
GO to F19
F14: HEATED O2 SENSOR SCREEN GROUND CONTINUITY

With EM010 and EM012 disconnected, measure the
voltage between EM010/023 and EM012/022. 1
Is the voltatage 0 (zero) V?
Yes GO to F17
No Inspect harness / connecto rs EM010, EM012 and EM023
for corrosion, damaged / pushed back pins.
Repair as required an d reconnect plug(s).
GO to F19
F17: CHECK FOR SHORT TO B+ AT O2 SENSOR HEATER

Ignition switch to position 0 1
Remove EMS fuse F14. 2
Disconnect EM010 and EM015. 3
Using a link lead, bridge EM010/016 and EM010/022. 4
Measure the voltage between EM010/023 and
EM015/001. 5
Is the voltage 0 (zero) V?
Yes Replace EMS fuse F14 but retain link lead
GO to F18
No Inspect connectors EM010, EM015, and EM023 for
corrosion, damaged / pushed back pins or repair the
harness; reconnect plug(s).
GO to F19
F18: CHECK B+ AT O2 SENSOR HEATER CIRCUIT

Connect the scan tool 1
Have the DTC(s) and freeze frame data been recorded?
Yes GO to G2
G2: 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
Measure the voltage between EM024/001 and EM024/002. 2
Is the voltage between 600mV and 1.0 Volt?
Yes
GO to G3
No Renew O2 sensor and reconnect plug(s)
GO to G6
G3: CHECK FOR O2 SENSOR FAILURE

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