JAGUAR X308 1998 2.G Workshop Manual

With EM012 and EM021 disconnected, measure the
resistance between EM012/022 and EM021/004 1
Is the resistance < 0.5 OHM?
Yes GO to A14
No Inspect harness / connectors EM012, EM021 and splice
EMS08 for corrosion, damaged / pushed back pins. Repair as
required and reconnect plug(s).
GO to A18
A14: CHECK FOR SHORT TO B+

Ignition switch to position 0 1
Disconnect EM010 and EM012
Inside ECM housing
2
Ignition switch to position II 3
Measure the voltage between EM010/023 and EM012/015 4
Is the voltage 0 (zero) V?
Yes GO to A15
No Inspect harness / connectors EM010, EM012, and EM021 for
corrosion, damaged / pushed back pins. Repair as required
and reconnect plug(s).
GO to A18
A15: CHECK FOR SHORT TO B+
Measure the voltage between EM010/023 and EM012/022 1

Is the voltage 0 (zero) V?
Yes GO to A16
No Inspect harness / connectors EM010, EM012, and EM021 for
corrosion, damaged / pushed back pins. Repair as necessary
and reconnect plug(s).
GO to A18
A16: CHECK FOR SHORT TO B+ AT O2 SENSOR HEATER

Ignition switch to position 0 1
Remove EMS fuse F14 2
Disconnect EM010 and EM015
Inside ECM housing
3
Using a link lead, bridge EM010/016 and EM010/022 4
Ignition switch to position II 5
Measure the voltage between EM010/023 and EM015/002 6
Is the voltage 0 (zero) V?
Yes Replace EMS fuse F14 but retain link lead
GO to A17
No Inspect harness / connectors EM010, EM015, and EM021 for
corrosion, damaged / pushed back pins. Repair as necessary
and reconnect plug(s).
GO to A18
A17: CHECK B+ AT O2 SENSOR HEATER CIRCUIT

Pinpoint test B: P0133
Measure the voltage between EM010/023 and EM015/002 1
Is the voltage B+?
Yes Remove link lead and reconnect all connectors
GO to A18
No Check EMS fuse F14 and that EMS control relay (relay 1) is
energized and with all connections made.
GO to A18
A18: 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 B : P0133
TEST CONDITIONSDETAILS/RESULTS/ACTIONS
B1: RETRIEVE DTCS
• NOTE: Battery and or ECM disconnection prior to scanning wi ll erase all data, ensure that the correct DTC is present.

Connect the scan tool 1
Have the DTC(s) and freeze frame data been recorded?
Yes GO to B2
B2: CHECK FOR LOW EX HAUST TEMPERATURE
Check the engine and exhaust system for normal running
temperature 1
Is the engine and exhaust sy stem up to normal running
temperature?
Yes GO to B3
No Rectify possible leaking exhaust manifold / catalyst, general
causes of an over rich mixture and engine cooling system
operation. Test the system for correct operation.
GO to B8
B3: CHECK FOR O2 SENS OR HEATER CONTINUITY
Ignition switch to position 0 1
Disconnect EM021
Bracket on top of gearbox or Bulkhead rear of engine
2
With EM021 disconnected, measure the resistance between
EM021/001 and EM021/002. 3
Is the resistance between 4 and 10 OHM?
Yes
GO to B4
No Renew O2 sensor, reconnect plug(s).
GO to B8
B4: 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 EM021/003 and EM021/004. 2
Is the voltage between 600mV and 1.0 Volt?
Yes
GO to B5
No Renew O2 sensor, reconnect plug(s).
GO to B8
B5: CHECK FOR O2 SENSOR FAILURE
With the conditions held as B4, suddenly decelerate to idle. 1
Has the voltage dropped to 400mV or less ?
Yes GO to B6
No Renew O2 sensor, reconnect plug(s).
GO to B8
B6: CHECK FOR O2 SENSOR FAILURE
With the conditions held as B5, suddenly accelerate to
approximately 2500 rpm. 1
Has the voltage risen to between 600mV and 1 volt?
Yes

GO to B7
No Renew O2 sensor, reconnect plug(s).
GO to B8
B7: CHECK FOR O2 SENSOR FAILURE
With the conditions held as in B6, 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 B9
No Renew O2 sensor, reconnect plug(s).
GO to B8
B8: 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
B9: HEATED O2 SENSOR SHORT CIRCUIT TO GROUND

With EM021 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 B11
No Renew the O2 sensor and reconnect plug(s).
GO to B10
B10: 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
B11: 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 B12
No Inspect connector EM010 for co rrosion, damage, or pushed
back pins.
Inspect earthing stud EM008L for corrosion.
Inspect harness, splice EMS36.
Repair as required an d reconnect plug(s).
GO to B13
B12: SIGNAL GROUND 2 CONTINUITY