Jaguar X-Type Sedan and Estate (Wagon). Service manual — part 478
Published: 11-May-2011
Acceleration Control -
Torque Specifications
Description
Nm
lb-ft
lb-in
Accelerator pedal
9
-
80
Published: 11-May-2011
Acceleration Control - Acceleration Control
Description and Operation
Item
Part Number
Description
1
—
Engine control module (ECM)
2
—
Accelerator pedal (left-hand drive vehicles)
3
—
Throttle body
4
—
Accelerator pedal (right-hand drive vehicles)
Vehicles with 2.0L engine
The acceleration control consists of the pedal and shaft assembly, accelerator cable and accelerator cable bracket.
WARNING: Make sure surrounding components such as wiring, hoses, sound insulation and floor carpeting are not contacting the
sliding inner cable or the accelerator pedal and shaft. Failure to follow these instructions may result in personal injury.
The throttle is controlled by an accelerator cable attached to the accelerator pedal and shaft. The accelerator pedal and shaft should travel
smoothly from the idle to the wide-open throttle positions. Hesitation on return or prevention of return to the idle position must not occur.
Vehicles with 2.5L, 3.0L or diesel engine
The accelerator pedal demand sensor provides an analogue voltage to the ECM which is proportional to the accelerator pedal position. A
throttle position sensor provides a signal to the ECM which monitors throttle plate position.
After receiving these signals and monitoring the wheel speed signal output, coolant temperature, rotary switch status (automatic
transmission) and inertia switch confirmation, the ECM then issues a throttle request signal. A motor within the throttle body rotates the
throttle plate to a position which is relative to the position demanded.
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Published: 11-May-2011
Acceleration Control - Acceleration Control
Diagnosis and Testing
1. Verify the customer concern by operating the system.
1.
2. Visually inspect for obvious signs of mechanical or electrical damage.
2.
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next
step.
3.
4. If the concern is not visually evident, use a fault code reader to retrieve the fault codes before proceeding to the Symptom Chart.
4.
Symptom Chart
Symptom
Possible Sources
Action
DTC P1240, P1241,
P1242
Accelerator pedal power supply
circuit out of range
GO to Pinpoint Test A.
DTC P1122, P1123,
P1215, P1216, P1344
Accelerator pedal demand sensor
output circuit out of range
GO to Pinpoint Test B.
DTC P0121, P0122,
P0123
Throttle position sensor circuit
out of range
GO to Pinpoint Test C.
DTC P1251, P1658,
P1631, P1657
Throttle motor relay failure
GO to Pinpoint Test D.
DTC P1243
Accelerator pedal demand sensor
ground; open circuit
GO to Pinpoint Test E.
DTC P1506, P1507,
P1611, P1633
Engine control module (ECM)
failure
INSTALL a new ECM. For additional information, refer toSection
303-14A
Electronic Engine Controls
Section
303-14B Electronic Engine Controls
.
DTC P1254, P1250
Throttle limp home spring
malfunction.
INSTALL a new throttle motor. For additional information refer toSection
303-14A Electronic Engine Controls
Section
303-14B Electronic Engine
Controls
.
Accelerator Pedal Demand Sensor Electrical Connector (PA1, Harness Side)
Pin Number
Circuit Function
Circuit Color
1
Sensor Ground
Black/Green
2
Sensor Ground
Black/Green
3
Output Signal
Red
4
Sensor Power Supply (5 volts)
Orange/Yellow
5
Sensor Power Supply (5 volts)
Yellow
6
Output Signal
Yellow
Engine Control Module (ECM) Electrical Connector (EN16, Harness Side)
1
2
3
1
2
3
4
1
2
Pin Number
Circuit Function
Circuit Color
12
Output (5 volts)
Orange/Yellow
13
Output (5 volts)
Yellow
19
Ground
Black/Green
20
Ground
Black/Green
52
Throttle Relay Ground
Green/Red
75
Input
Purple
76
Input
Yellow
80
Throttle motor
Green
102
Input
Red
103
Input
Yellow
106
Throttle motor
Red
134
Power Supply (12 volts)
Red/White
Throttle Position Sensor Electrical Connector (EN13, Harness Side)
Pin Number
Circuit Function
Circuit Color
1
Sensor Ground
Black/Green
2
Output Signal
Yellow
3
Output Signal
Purple
4
Sensor Power Supply (5 volts)
Orange/Yellow
Throttle Motor Electrical Connector (EN10, Harness Side)
Pin Number
Circuit Function
Circuit Color
80
Throttle motor
Green
106
Throttle motor
Red
PINPOINT TEST A : DTC P1240, P1241, P1242
TEST
CONDITIONS
DETAILS/RESULTS/ACTIONS
A1: CHECK THE POWER SUPPLY TO THE ACCELERATOR PEDAL DEMAND SENSOR
TURN the ignition switch to the RUN position.
Measure the voltage between electrical connector PA1-5 and ground.
Measure the voltage between electrical connector PA1-4 and ground.
Is the voltage less than 4.5 volts?
Yes
GO to A2
. .
No
DIAGNOSE the electronic engine control system. For additional information, refer toSection
303-14A Electronic Engine
Controls
Section
303-14B Electronic Engine Controls
.
A2: CHECK CONTINUITY OF THE ACCELERATOR PEDAL DEMAND SENSOR POWER SUPPLY CIRCUIT
Turn the ignition switch to the OFF position.
Disconnect the ECM electrical connector EN16 and the accelerator pedal electrical connector PA1.
Measure the resistance between EN16-13 and PA1-5.
Measure the resistance between EN16-12 and PA1-4.
Is the resistance less than 5 ohms?
Yes
GO to A3
. .
No
REPAIR the power supply circuit from the ECM to the accelerator pedal. CLEAR the DTC. TEST the system for normal
operation.
A3: CHECK THE ACCELERATOR PEDAL DEMAND SENSOR POWER SUPPLY FOR A SHORT CIRCUIT TO GROUND
Measure the resistance between PA1-5 and ground.
Measure the resistance between PA1-4 and ground.
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