check engine JAGUAR X308 1998 2.G Workshop Manual

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

Connect the scan tool 1
Have the DTC(s) and freeze frame data been recorded?
Yes GO to C2
C2: CHECK FOR O2 SENSOR FAILURE
Ignition switch to position II 1
Disconnect EM022
Bracket on top of gearbox or Bulkhead rear of engine
2
Run the engine for a period to warm the sensor and then
maintain a steady speed of approximately 2500 rpm. 3
Measure the voltage between EM022/001 and EM022/002. 4
Is the voltage between 600mV and 1.0 Volt?
Yes
GO to C3
No Renew O2 sensor and reconnect plug(s).
GO to C6
C3: CHECK FOR O2 SENSOR FAILURE
With the conditions held as C2, suddenly decelerate to idle. 1
Has the voltage dropped to 400mV or less ?
Yes

With the conditions held as in C4, 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 C7
No Renew O2 sensor and reconnect plug(s).
GO to C6
C6: 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
C7: CHECK FOR O2 SENSOR CONTINUITY

Connect the scan tool 1
Have the DTC(s) and freeze frame data been recorded?
Yes GO to D2
D2: CHECK FOR LOW EXHAUST TEMPERATURE
Check the engine and exhaust system for correct operation
and normal running temperature 1
Is the engine and exhaust system operating correctly and up to
normal running temperature?
Yes GO to D3
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 D7
D3: 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 EM022/001 and EM022/002. 2

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 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

Connect the scan tool 1
Have the DTC(s) and freeze frame data been recorded?
Yes GO to E2
E2: CHECK O2 SENSOR HEATER CONTINUITY
Ignition switch to position 0 1
Disconnect EM023
Bracket on top of gearbox or Bulkhead rear of engine
2
Measure the resistance between EM023/001 and
EM023/002. 3
Is the resistance between 4 and 10 OHM?
Yes
GO to E3
No Renew O2 sensor. Reconnect plug(s)
GO to E7
E3: 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
With EM023 disconnected, measure the voltage between
EM023/003 and EM023/004. 2
Is the voltage between 600mV and 1.0 Volt?
Yes
GO to E4
No Renew O2 sensor. Reconnect plug(s)
GO to E7
E4: CHECK FOR O2 SENSOR FAILURE