Jaguar XJ (X350). Manual — part 738
Description and operation
Starting System
The function of the starting system is to crank the engine fast enough to allow the engine to
start. Heavy cables, connectors and switches are used in the system because of the large
currents required.
The starting system consists of a pre-engaged type starter motor, battery, remote control
switch (ignition switch) and relay. When the starter is operated from the ignition switch, the
engagement lever moves the pinion into mesh with the engine ring gear teeth, the electrical
contacts within the solenoid complete the high power circuit and the starter motor operates to
turn the engine.
Vehicles equipped with automatic transmission have a transmission range sensor attached to
the circuit which prevents operation of the starter motor unless NEUTRAL or PARK are
selected.
The sequence of operation is as follows:
Ignition switch in the start position III.
Starter relay activated.
Voltage provided to the starter motor solenoid.
Starter solenoid engages the drive pinion to the flywheel or flexiplate.
Starter solenoid switches the battery current to the starter motor.
System remains engaged until the ignition switch is returned to the run position.
Diagnosis and testing
Starting System
Overview
There are changes to the engine management system (EMS) for 2006 my, the most obvious of which
will be the change to 7-digit diagnostic trouble codes (DTCs) from the familiar 5-digit.
Refer to the DTC index in this section for guidance on how to use these codes with the Jaguar
approved diagnostic system or a scan tool.
For information on the operation of the system,
Starting System
Inspection and verification
1 . Verify the customer concern.
2 . Visually inspect for obvious signs of mechanical or electrical damage.
Mechanical
Electrical
Gear selector lever cable adjustment (vehicles with
automatic transmission)
Starter Motor
Battery
Battery charge and condition
Fuses
Wiring harness(es)
Damaged, loose or corroded
connectors
Ignition switch
Starter relay
Transmission control module
(TCM)
Engine control module (ECM)
3 . If an obvious cause for an observed or reported concern is found, correct the cause (if possible)
before proceeding to the next step.
4 . If the cause is not visually evident use the Jaguar approved diagnostic system or a scan tool to
retrieve the fault codes before proceeding to the DTC index, or the symptom chart if no DTCs are set.
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Symptom chart
Symptom
Possible cause(s)
Action
The engine does
not crank (starter
motor does not
turn)
Gear selector not in P or N
position (vehicles with
automatic transmission)
Battery
Harness/Connectors
Starter motor
Starter relay
Ignition switch
Transmission control module
(TCM)
Engine control module (ECM)
Engine siezed
Make sure the gear selector is in the P or N
position and correctly adjusted.
Selector Lever Cable Adjustment (44.15.07)
Check the battery condition and state of
charge.
Battery Check the starter motor and harness,
GO to Pinpoint Test G557182p1.
Check the starter relay and circuits. GO to
Pinpoint Test G557182p2.
Check that the engine turns.
The engine does
not crank (starter
motor does turn)
Starter motor fitment
Starter motor
Flywheel/Drive plate ring
gear
Check the starter motor fitment (fasteners
tight, starter motor square to engine, etc).
Check the flywheel/drive plate ring gear teeth
for damage, foreign objects, etc.
Engine cranks too
slowly
Battery
Harness/Connectors
Starter motor
Oil grade
Check the battery condition and state of
charge.
Battery Check the starter motor and harness,
GO to Pinpoint Test G557182p3.
Check the oil specification.
Excessive starter
motor noise
Starter motor
Flywheel/Drive plate ring
gear
Starter motor fitment/casing
Check the starter motor fitment (fasteners
tight, motor square to engine, etc). Check the
starter motor casing condition. Check the
flywheel/drive plate ring gear teeth for
damage, foreign objects, etc.
Generic scan tools may not read the codes listed, or may read only 5-digit codes. Match the 5
digits from the scan tool to the first 5 digits of the 7-digit code listed to identify the fault (the last
2 digits give extra information read by the manufacturer-approved diagnostic system).
NOTE:
For a full list of powertrain DTCs,
Electronic Engine Controls - VIN Range: G00442->G45703
Electronic Engine Controls - VIN Range: G45704->G99999
Electronic Engine Controls - VIN Range: G00442->G45703
Electronic Engine Controls - VIN Range: G45704->G99999
Electronic Engine Controls
DTC
Description
Possible causes
Action
P05120C
Starter request circuit -
circuit voltage above
threshold
Starter relay coil to
ECM/ignition switch
circuit: short circuit to
power
Ignition switch failure
For starter request circuit
tests, GO to Pinpoint Test
G557182p2.
P05120E
Starter request circuit -
circuit voltage below
threshold
Starter relay coil to
ECM/ignition switch
circuit: short circuit to
ground
Starter relay coil to
ECM/ignition switch
circuit: high resistance
Ignition switch failure
For starter request circuit
tests, GO to Pinpoint Test
G557182p2.
P06160E Starter relay circuit low
Starter relay drive circuit:
short circuit to ground
Starter relay drive circuit: high
resistance
Starter relay failure
For starter relay and circuit
tests, GO to Pinpoint Test
G557182p2.
P061700 Starter relay circuit high
Starter relay drive circuit:
short circuit to power
Starter relay failure
For starter relay and circuit
tests, GO to Pinpoint Test
G557182p2.
P06170C Starter relay circuit high
Starter relay drive circuit:
short circuit to power
For starter relay and circuit
tests, GO to Pinpoint Test
DTC index
NOTE:
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