ECM JAGUAR X308 1998 2.G Workshop Manual

Ignition switch to position 0 1
Disconnect EM010
Inside ECM housing
2
Disconnect EM012
Inside ECM housing
3
Ignition switch to position II 4
Measure the voltage between EM010/023 and EM012/015. 5
Is the voltage 0 (zero) V?
Yes GO to B16
No Inspect harness / connectors EM010, EM012 and EM021 for
corrosion, damaged / pushed back pins. Repair as necessary
and reconnect plug(s).
GO to B19
B16: CHECK FOR SHORT TO B+
Measure the voltage between EM010/023 and EM012/022 1

Pinpoint test C: P0137, P0138
Measure the voltage between EM010/023 and EM015/002. 1
Is the voltage B+?
Yes Remove link lead and reconnect all connectors.
GO to B19
No Check EMS fuse F14 and that EMS control relay (relay 1) is
energized and with all connections made.
GO to B19
B19: 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 C : P0137, P0138
TEST CONDITIONSDETAILS/RESULTS/ACTIONS
C1: RETRIEVE DTCS
• NOTE: Battery and or ECM disconnection prior to scanning wi ll erase all data, ensure that the correct DTC is present.

Ignition switch to position 0 1
Disconnect EM010
Inside ECM housing
2
Disconnect EM012
Inside ECM housing
3
Measure the voltage between EM010/023 and EM012/017. 4
Ignition switch to position II 5
Is the voltage 0 (zero) V?
Yes GO to C15
No Inspect harness / connectors EM010, EM012, and EM022 for
corrosion, damaged / pushed back pins. Repair as required
and reconnect plug(s).
GO to C18
C15: CHECK FOR SHORT TO B+

Pinpoint test D: P0140
Measure the insulation resistance between EM012/017 and
EM012/022. 1
Is the resistance > 10 MOHM?
Yes Reconnect all plugs
GO to C18
No Inspect harness / connector EM012 for corrosion, bent /
pushed back pins. Repair as re quired and reconnect plug(s).
GO to C18
C18: 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 D : P0140
TEST CONDITIONSDETAILS/RESULTS/ACTIONS
D1: RETRIEVE DTCS
• NOTE: Battery and or ECM disconnection prior to scanning wi ll erase all data, ensure that the correct DTC is present.

Ignition switch to position 0 1
Disconnect EM010
Inside ECM housing
2
Disconnect EM012
Inside ECM housing
3
Ignition switch to position II 4
Measure the voltage between EM010/023 and EM012/015. 5
Is the voltage 0V?
Yes GO to D18
No Inspect harness / connectors EM010, EM012 and EM022 for
corrosion, damaged / pushed back pins.
Repair as required an d reconnect plug(s).
GO to D21
D18: CHECK FOR SHORT TO B+

Pinpoint test E: P0151, P0152, P0155
Measure the insulation resistance between EM012/017 and
EM012/022. 1
Is the resistance > 10 MOHM?
Yes Reconnect all plugs
GO to D21
No Inspect harness / connector EM012, EM015 and EM022 for
corrosion, bent / pushed back pins.
Repair as required an d reconnect plug(s).
GO to D21
D21: 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 E : P0151, P0152, P0155
TEST CONDITIONSDETAILS/RESULTS/ACTIONS
E1: RETRIEVE DTCS
• NOTE: Battery and or ECM disconnection prior to scanning wi ll erase all data, ensure that the correct DTC is present.

Pinpoint test F: P0153
With EM010 and EM015 disconnected, measure the
voltage between EM010/023 and EM015/001. 1
Is the voltage B+?
Yes Remove link lead and reconnect all connectors.
GO to E18
No Check integrity of EMS fuse F1 4, EMS control relay (relay
1) is energized and all connections are made.
GO to E18
E18: 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 F : P0153
TEST CONDITIONSDETAILS/RESULTS/ACTIONS
F1: RETRIEVE DTCS
• NOTE: Battery and or ECM disconnection prior to scanning wi ll erase all data, ensure that the correct DTC is present.

Pinpoint test G: P0157, P0158
With EM010 and EM015 disconnected, measure the
voltage between EM010/023 and EM015/002. 1
Is the voltage B+?
Yes Remove link lead and reconnect all connectors.
GO to F19
No Check integrity of EMS fuse F1 4, EMS control relay (relay
1) is energized and all connections made.
GO to F19
F19: 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 G : P0157, P0158
TEST CONDITIONSDETAILS/RESULTS/ACTIONS
G1: RETRIEVE DTCS
• NOTE: Battery and or ECM disconnection prior to scanning wi ll erase all data, ensure that the correct DTC is present.

Pinpoint test H: P0160
Me
asure the insulation resistance between EM012/016 and
EM015/001.
1
I s
the resistance > 10 MOHM?
Yes Reconnect all plugs.
GO to G20
No Inspect harness / EM012, EM 015 and EM024 for corrosion,
bent / pushed back pins . Repair as necessary.
GO to G20
G2 0: END
Perform a
ppropriate service drive cycle and check for the
presence of DTC.
1
Has th
e fault code cleared?
Yes STOP
No Contact Jaguar Service
PI
NPOINT TEST H : P0160
T
E
ST CONDITIONS
D
E
TAILS/RESULTS/ACTIONS
H1
:
RETRIEVE DTCS
•
NOTE
: Battery and or ECM disconnection prior to scanning wi
ll erase all data, ensure that the correct DTC is present.

Fuel System - General Inform
ation - Fuel System
Description an
d Operation

The fuel tank is mounted across the vehicle behind the passenger compartment bulkhead.
Fuel is drawn by the fuel pump from the tank and then supplied to the two fuel rails, via a filter.
Fuel injectors are installed in the fuel ra ils on each side of the intake manifold.
The amount of fuel injected into th e engine is controlled by the ECM.
A cross-over pipe connects the two fuel ra ils together at the front of the manifold.
A test valve in the cross-over pipe allo ws the fuel rail to be pressurized and de-pressurized during the servicing and
troubleshooting procedures.
A pressure regulator on the rear of the right fuel rail controls the pressure in the fuel rails.
A return line directs excess fuel from the pressure regulator back to the fuel tank.
Operation and service procedures
The fuel injector
s, rails, pres
sure regulator and, wher e fitted, supercharger are described in greater detail in Section 303-04
together with servicing procedures.
The fuel tank, pump, fuel level senders and fuel lines are similarly covered in Section 310-01.