Jaguar XJ (X350). Manual — part 639

P0308 Misfire detected, cylinder 8

ECM to ignition coil primary

circuit fault (cylinder misfire
detected DTC also flagged)

Ignition coil failure

Spark plug

failure/fouled/incorrect gap

Fuel injector circuit fault(s)

(injector DTCs also flagged)

Fuel delivery pressure high/low

Fuel injectors restricted/leaking

Fuel injectors continuously

open

Fuel contamination

Worn camshaft/broken valve

springs

For ignition system,

Engine Ignition - VIN

Range: G00442-

>G45703 For injector

circuit tests for vehicles

without supercharger,

GO to Pinpoint Test

G290117p1.

For vehicles with

supercharger, GO to

Pinpoint Test

G290117p3.

Check fuel pressure,

Fuel Tank and Lines -

3.0L/3.5L/4.2L, VIN

Range: G00442-

>G45703 For fuel

injector information,

Fuel Injectors (18.10.02)

For engine information,

Engine

P0460

Fuel level sensor circuit

range/performance

Fuel level sensor to rear

electronic control module
circuit(s); intermittent short
circuit, open circuit, high
resistance

Fuel level sensor failure

Rear electronic control module

fault (incorrect fuel level
data)

For fuel level sensor and

circuit tests,

Fuel Tank and Lines -

3.0L/3.5L/4.2L, VIN

Range: G00442-

>G45703

P1224 Throttle control position error

Throttle motor 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.

P1229

Throttle motor control circuit

malfunction

Throttle motor disconnected

Throttle motor to ECM drive

circuits; short circuit or
open circuit

ECM ground circuit fault(s)

(EM80-04, 05, 54)

Throttle motor failure

Throttle body failure

For throttle motor and

circuit tests, and for ECM

ground tests,

Electronic Engine

Controls - VIN Range:

G00442->G45703 For

throttle body,

Throttle Body - VIN

Range: G00442->G45703

(19.70.04)

P1234

No fuel pump commands

received by ECM

ECM to fuel pump module drive

circuit; open circuit, short
circuit, high resistance

Fuel pump module failure

For fuel pump module

circuit tests,

Fuel Tank and Lines -

3.0L/3.5L/4.2L, VIN

Range: G00442-

>G45703

P1236

Fuel pump not activated when

requested by ECM

ECM to fuel pump module drive

circuit; open circuit, short
circuit, high resistance

Fuel pump module failure

For fuel pump module

circuit tests,

Fuel Tank and Lines -

3.0L/3.5L/4.2L, VIN

Range: G00442-

>G45703

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

For throttle motor relay

tests,

Electronic Engine

Controls - VIN Range:

G00442->G45703

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ECM ground circuit fault (relay

coil drive)

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 (Note:

this DTC will flag only when

accompanied by an individual

cylinder misfire DTC; P0300-

P0308)

Refer to P0300 possible sources

Refer to P0300 Actions.

P1314

Left-hand cylinders misfire

rate catalyst damage (Note:

this DTC will flag only when

accompanied by an individual

cylinder misfire DTC; P0300-

P0308)

Refer to P0300 possible sources

Refer to P0300 Actions.

P1316

Misfire excess emission (Note:

This DTC will flag only when

accompanied by an individual

cylinder misfire DTC; P0300 to

P0308)

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

and pump circuit tests,

Fuel Tank and Lines -

3.0L/3.5L/4.2L, VIN

Range: G00442-

>G45703

P1631

Throttle motor power relay

coil activation circuit failure

Throttle motor relay coil to

ECM circuit; open circuit

For throttle motor relay

tests,

Throttle motor relay failure

Throttle motor relay coil to

ECM drive circuit; open
circuit, short circuit to
ground

Electronic Engine

Controls - VIN Range:

G00442->G45703

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,

Electronic Engine

Controls - VIN Range:

G00442->G45703

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,

Electronic Engine

Controls - VIN Range:

G00442->G45703

Pinpoint Tests

PINPOINT TEST G290117p1 : DTC
P0201, P0202, P0203, P0204, P0205, P0206,
P0207, P0208; FUEL INJECTORS,
VEHICLES WITHOUT
SUPERCHARGER

G290117t1 : CHECK THE INJECTOR COIL RESISTANCE

1. Turn the ignition switch to the OFF position. 2. Disconnect the relevant injector electrical

connector (IS01 to IS04 for right-hand cylinders, IS07 to IS10 for left-hand cylinders). 3. Measure the

resistance between the injector pins.

Is the resistance between 12 and 16 ohms?

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