Jaguar XJ (X350). Service manual — part 625
•
Fuel pump module failure
P1250
Throttle return spring
failure malfunction
Throttle return spring failure
(throttle body failure)
This DTC can only be
accurately diagnosed using
the Jaguar approved
diagnostic system. If this is
not available, INSTALL a
new throttle body.
Throttle Body - VIN Range:
G00442->G45703
(19.70.04) CLEAR the DTC,
TEST the system for normal
operation.
P1251
Throttle motor relay OFF
failure
•
Throttle motor relay coil
power supply circuit; open
circuit
•
Throttle motor relay failure
•
Throttle motor relay coil to
ECM circuit; open circuit
•
ECM ground circuit fault
(relay coil drive)
For throttle motor relay
tests, <<303-14>>
P1254
Throttle limp-home spring
malfunction
Throttle body
This DTC can only be
accurately diagnosed using
the Jaguar approved
diagnostic system. If this is
not available, INSTALL a
new throttle body.
Throttle Body - VIN Range:
G00442->G45703
(19.70.04) CLEAR the DTC,
TEST the system for normal
operation.
P1313
Right-hand cylinders misfire
rate catalyst damage (this
DTC will flag only when
accompanied by an
individual cylinder misfire
DTC; P0300-P0306)
Refer to P0300 possible sources
Refer to P0300 Actions
P1314
Left-hand cylinders misfire
rate catalyst damage (this
DTC will flag only when
Refer to P0300 possible sources
Refer to P0300 Actions
accompanied by an
individual cylinder misfire
DTC; P0300-P0306)
P1316
Misfire excess emission
(Note: This DTC will flag
only when accompanied by
an individual cylinder
misfire DTC; P0300 to
P0306)
Refer to P0300 possible sources
Refer to P0300 Actions
P1338
Fuel pump drive circuit
low/high voltage
•
Fuel pump module to fuel
pump drive circuit; open
circuit, short circuit, high
resistance
•
Fuel pump module failure
•
Fuel pump failure
For fuel pump module
circuit tests, <<310-01>>
P1631
Throttle motor power relay
coil activation circuit failure
•
Throttle motor relay coil to
ECM circuit; open circuit
•
Throttle motor relay failure
•
Throttle motor relay coil to
ECM drive circuit; open
circuit, short circuit to
ground
For throttle motor relay
tests, <<303-14>>
P1634
Throttle watchdog circuit
malfunction
•
ECM failure
Contact dealer technical
support for advice on
possible ECM failure.
P1656
Throttle position (TP)
sensor amplifier circuit
malfunction
•
ECM failure
Contact dealer technical
support for advice on
possible ECM failure.
P1657
Throttle motor relay coil
drive circuit ON failure
•
Throttle motor relay failure
•
Throttle motor relay coil to
ECM drive circuit; short
circuit to B+ voltage
For throttle motor relay
tests, <<303-14>>
P1658
Throttle motor relay ON
failure
•
Throttle motor relay failure
•
Throttle motor relay coil to
ECM drive circuit; short
circuit to B+ voltage
For throttle motor relay
tests, <<303-14>>
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Pinpoint Tests
PINPOINT TEST G206886p1 : DTC
P0201, P0202, P0203, P0204, P0205, P0206;
FUEL INJECTORS
G206886t1 : CHECK THE INJECTOR COIL RESISTANCE
1. Turn the ignition switch to the OFF position. 2. Disconnect the battery negative terminal. 3.
Disconnect the relevant injector electrical connector (IL03 to IL08). 4. Measure the resistance
between the injector pins.
•
Is the resistance between 12 and 16 ohms?
-> Yes
GO to Pinpoint Test G206886t2.
-> No
INSTALL a new injector.
Fuel Injectors (18.10.02) CLEAR the DTC. TEST the system for normal operation.
G206886t2 : CHECK THE INJECTOR COIL INSULATION
1. Measure the resistance between the injector pin 01 and the injector body. 2. Measure the
resistance between the injector pin 02 and the injector body.
•
Is either resistance less than 10,000 ohms?
-> Yes
INSTALL a new injector.
Fuel Injectors (18.10.02) CLEAR the DTC. TEST the system for normal operation.
-> No
GO to Pinpoint Test G206886t3.
G206886t3 : CHECK THE INJECTOR SUPPLY VOLTAGE
1. Reconnect the battery negative terminal. 2. Turn the ignition switch to the ON position. 3.
Disconnect the relevant injector harness electrical connector (IL03 to IL08). 4. Measure the voltage
between the relevant injector harness electrical connector (IL03 to IL08) pin 02 and GROUND.
•
Is the voltage less than 10 Volts?
-> Yes
REPAIR the circuit between the relevant injector harness electrical connector (IL03 to IL08) pin 02
and battery. This circuit includes the front power distribution box, fuse 13, and the EMS relay. For
additional information, refer to the wiring diagrams. CLEAR the DTC. TEST the system for normal
operation.
-> No
GO to Pinpoint Test G206886t4.
G206886t4 : CHECK THE INJECTOR GROUND CIRCUIT
1. Turn the ignition switch to the OFF position. 2. Disconnect the battery negative terminal. 3.
Disconnect the ECM electrical connector PI01. 4. Measure the resistance between the relevant
injector harness electrical connector (IL03 to IL08) pin 01 and PI01 pins as follows:
•
Injector Cyl 1 pin 01 (BG) and PI01, pin 115 (BG).
•
Injector Cyl 2 pin 01 (BR) and PI01, pin 120 (BR).
•
Injector Cyl 3 pin 01 (BK) and PI01, pin 114 (BK).
•
Injector Cyl 4 pin 01 (BO) and PI01, pin 119 (BO).
•
Injector Cyl 5 pin 01 (BG) and PI01, pin 113 (BG).
•
Injector Cyl 6 pin 01 (U) and PI01, pin 118 (U).
•
Is the resistance greater than 5 ohms?
-> Yes
REPAIR the high resistance circuit. For additional information, refer to the wiring diagrams. CLEAR the
DTC. TEST the system for normal operation.
-> No
GO to Pinpoint Test G206886t5.
G206886t5 : CHECK THE INJECTOR GROUND CIRCUIT FOR SHORT CIRCUIT
TO BATTERY
1. Reconnect the battery negative terminal. 2. Turn the ignition switch to the ON position. 3.
Measure the voltage between the relevant injector harness electrical connector (IL03 to IL08) pin 01
and GROUND.
•
Is the voltage greater than 3 volts?
-> Yes
REPAIR the short circuit. For additional information, refer to the wiring diagrams. CLEAR the DTC.
TEST the system for normal operation.
-> No
GO to Pinpoint Test G206886t6.
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