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Jaguar XJ (X350). 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

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Throttle motor relay coil
power supply circuit; open
circuit

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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

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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

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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>>

www.

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.

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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:

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Injector Cyl 1 pin 01 (BG) and PI01, pin 115 (BG).

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Injector Cyl 2 pin 01 (BR) and PI01, pin 120 (BR).

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Injector Cyl 3 pin 01 (BK) and PI01, pin 114 (BK).

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Injector Cyl 4 pin 01 (BO) and PI01, pin 119 (BO).

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Injector Cyl 5 pin 01 (BG) and PI01, pin 113 (BG).

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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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