1998 JAGUAR X308 sensor

Inspection and Verification
Vehicle Harness Check
1.1. Check for open and short circuit in harness conn ector faults between the O2 sensor and ECM.
2. 2. Check for approximately 12V between heater harness.
ItemDescription
1ECM
2Downstream oxygen sensor (A)
3Upstream heated oxygen sensor (A)
4Downstream oxygen sensor (B)
5Upstream heated oxygen sensor (B)
6Engine management fuse box

Heater Resistance Check
1.1. Verify that the resistance between the heater term inals is between 4OHM and 10OHM at -20°C to 100°C.
Performance Check
1.1. Run the engine at 2500 RPM for two minutes, to heat up the O2 sensor.
2. 2. Check the voltage of the sensor output: Alternates between less than 0.4V at feed back engine conditions and in
excess of 0.5V, see graph.

These voltages are for reference only.
3. 3. Check that cycle of the upstream se nsor output is in accordance with the appropriate pinpoint test.
4. 4. Check that cycle of the downstream sensor output is in accordance with the appropriate pinpoint test.

Exhaust System - Exhaust System
Diagnosis and Testing
Symptom Chart
Symptom Chart
Special Tool(s)

Digital multimeter

Generic scantool
SymptomPossible SourcesAction
DTC P0420 Catalyst system efficiency below
threshold (Bank 1)Catalyst failure
Upstream O2 sensor failure
Downstream O2 sensor failure
O2 sensor heater failure
Associated harness / connector failure
*
*
*
*
*See DTC P0137, P0138
and P0140
*
DTC P0430 Catalyst system efficiency below
threshold (Bank 2)Catalyst failure
Upstream O2 sensor failure
Downstream O2 sensor failure
O2 sensor heater failure
Associated harness / connector failure
*
*
*
*
*See DTC P0157, P0158
and P0160
*
DTC P0131 O2 sensor circuit low voltage (Bank 1
sensor 1)O2 sensor failure
Sensor ground fault
Harness failure
Connector pin(s) bent, loose or corroded
*
*
*
*GO to Pinpoint Test A
*
DTC P0132 O2 sensor circuit high voltage (Bank
1 sensor 1)O2 sensor failure to B+
Sensor ground fault
Harness failure
Connector pin(s) bent or tracking
between connections. O2 sensor failure
*
*
*
*
*GO to Pinpoint Test A
*
DTC P0133 O2 sensor circuit slow response
(Bank 1 sensor 1)O2 sensor heater failure / out of spec
Sensor ground fault
Harness failure
Connector pin(s) bent or tracking
between connections. Low exhaust temperature
O2 sensor failure
*
*
*
*
*
*GO to Pinpoint Test B
*
DTC P0135 O2 sensor heater circuit malfunction
(Bank 1 sensor 1)O2 sensor failure
Harness failure
Connector pin(s) bent or tracking
between connections. ECM failure
*
*
*
*GO to Pinpoint Test A
*
DTC P0137 O2 sensor circuit low voltage (Bank 1
sensor 2)O2 sensor failure
Sensor ground fault
Harness failure
Connector pin(s) bent, loose or corroded
*
*
*
*GO to Pinpoint Test C
*
DTC P0138 O2 sensor circuit high voltage (Bank
1 sensor 2)O2 sensor failure to B+
Sensor ground fault
Harness failure
Connector pin(s) bent or tracking
*
*
*
*GO to Pinpoint Test C
*

Pinpoint test A: P0131, P0132, P0135
between connections. ECM failure
*
DTC P0140 O2 sensor circuit no activity detected
(Bank 1 sensor 2)O2 sensor failure / out of spec
Sensor ground fault
Harness failure
Connector pin(s) bent or tracking
between connections. Low exhaust temperature
*
*
*
*
*GO to Pinpoint Test D
*
DTC P0420 Catalyst system efficiency below
threshold (bank 1)Downstream O2 sensor failure
Catalyst failure
Catalyst low temperature caused by
water splash
*
*
*GO to Pinpoint Test C
GO to Pinpoint Test D
*
*
DTC P0151 O2 sensor circuit low voltage (Bank 2
sensor 1)O2 sensor failure
Sensor ground fault
Harness failure
Connector pin(s) bent, loose or corroded
*
*
*
*GO to Pinpoint Test E
*
DTC P0152 O2 sensor circuit high voltage (Bank
2 sensor 1)O2 sensor failure to B+
Sensor ground fault
Harness failure
Connector pin(s) bent or tracking
between connections. O2 sensor failure
*
*
*
*
*GO to Pinpoint Test E
*
DTC P0153 O2 sensor circuit slow response
(Bank 2 sensor 1)O2 sensor heater failure / out of spec
Sensor ground fault
Harness failure
Connector pin(s) bent or tracking
between connections. Low exhaust temperature
O2 sensor failure
*
*
*
*
*
*GO to Pinpoint Test F
*
DTC P0155 O2 sensor heater circuit malfunction
(Bank 2 sensor 1)O2 sensor failure
Harness failure
Connector pin(s) bent or tracking
between connections. ECM failure
*
*
*
*GO to Pinpoint Test E
*
DTC P0157 O2 sensor circuit low voltage (Bank 2
sensor 2)O2 sensor failure
Sensor ground fault
Harness failure
Connector pin(s) bent, loose or corroded
*
*
*
*GO to Pinpoint Test G
*
DTC P0158 O2 sensor circuit high voltage (Bank
2 sensor 2)O2 sensor failure to B+
Sensor ground fault
Harness failure
Connector pin(s) bent or tracking
between connections. ECM failure
*
*
*
*
*GO to Pinpoint Test G
*
DTC P0160 O2 sensor circuit no activity detected
(Bank 2 sensor 2)O2 sensor failure / out of spec
Sensor ground fault
Harness failure
Connector pin(s) bent or tracking
between connections. Low exhaust temperature
*
*
*
*
*GO to Pinpoint Test H
*
DTC P0430 Catalyst system efficiency below
threshold (bank 2)Downstream O2 sensor failure
Catalyst failure
Catalyst low temperature caused by
water splash
*
*
*GO to Pinpoint Test G
GO to Pinpoint Test H
*
*
PINPOINT TEST A : P0131, P0132, P0135
TEST CONDITIONSDETAILS/RESULTS/ACTIONS
A1: 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 A2
A2: CHECK O2 SENSOR 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 A3
No Renew O2 sensor; reconnect plug(s)
GO to A6
A3: 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
Disconnect EM021 2

Bracket on top of gearbox or Bulkhead rear of engine
With EM021 disconnected, measure the voltage between
EM021/003 and EM021/004. 3
Is the voltage between 600mV and 1.0 Volt?
Yes
GO to A4
No Renew O2 sensor; reconnect plug(s)
GO to A6
A4: CHECK FOR O2 SENSOR FAILURE
With the conditions held as A3, suddenly decelerate to idle. 1
Has the voltage dropped to 400mV or less ?
Yes GO to A5
No Renew O2 sensor; reconnect plug(s)
GO to A6
A5: CHECK FOR O2 SENSOR FAILURE
With the conditions held as A4, suddenly accelerate to
approximately 2500 rpm. 1
Has the voltage risen to between 600mV and 1 volt?
Yes GO to A7
No Renew O2 sensor; reconnect plug(s)
GO to A6
A6: 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
A7: HEATED O2 SENSOR SHORT CIRCUIT TO GROUND

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 A9
No Renew the O2 sensor and reconnect plug(s)
GO to A8
A8: 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
A9: 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 A12
No Inspect connector EM014 for co rrosion, damage, or pushed
back pin.
Inspect ground stud EM008L for corrosion or damage.
Inspect harness, splice EMS36, connector or ground. Repair
as required and reconnect plug(s).
Repair as required an d reconnect plug(s).
GO to A11
A11: 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
A12: CHECK FOR HEATED O2 SENSOR CONTINUITY