Jaguar X-Type Sedan and Estate (Wagon). Service manual — part 479
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2
3
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3
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1
Is the resistance greater than 10,000 ohms?
Yes
DIAGNOSE the electronic engine control system. For additional information, refer toSection
303-14A Electronic Engine
Controls
Section
303-14B Electronic Engine Controls
.
No
REPAIR the power supply circuit from the ECM to the accelerator pedal. CLEAR the DTC. TEST the system for normal
operation.
PINPOINT TEST B : DTC P1122, P1123, P1215, P1216, P1344
TEST
CONDITIONS
DETAILS/RESULTS/ACTIONS
B1: CHECK THE ACCELERATOR PEDAL DEMAND SENSOR OUTPUT
Turn the ignition switch to the RUN position.
Measure the voltage between electrical connector PA1-6 and ground with the accelerator pedal released and with the
accelerator pedal at full throttle.
Measure the voltage between electrical connector PA1-3 and ground with the accelerator pedal released and with the
accelerator pedal at full throttle.
Does the voltage vary between 0.3 volts and 5 volts?
Yes
GO to B4
. .
No
GO to B2
. .
B2: CARRY OUT AN ACCELERATOR PEDAL POSITION SENSOR COMPONENT CHECK
Remove the accelerator pedal. For additional information, refer to
Pedal
.
Measure the resistance between pin 1 and pin 6 of the accelerator pedal.
Measure the resistance between pin 2 and pin 3 of the accelerator pedal.
Is the resistance between pin 1 and pin 6 between 546 and 1134 ohms, and between pin 2 and pin 3 between 975 and
2025 ohms?
Yes
GO to B3
. .
No
INSTALL a new accelerator pedal. For additional information, refer to
Pedal
. CLEAR the DTC. TEST the system for
normal operation.
B3: CHECK THE ACCELERATOR PEDAL DEMAND SENSOR CIRCUIT FOR A SHORT TO GROUND
Disconnect the ECM electrical connector EN16.
Measure the resistance between electrical connector PA1-6 and ground.
Measure the resistance between electrical connector PA1-3 and ground.
Is the resistance greater than 10,000 ohms?
Yes
GO to B4
. .
No
REPAIR the accelerator pedal demand sensor circuit from the ECM to the accelerator pedal. CLEAR the DTC. TEST the
system for normal operation.
B4: CHECK THE ACCELERATOR PEDAL DEMAND SENSOR CIRCUIT FOR OPEN CIRCUIT
Disconnect the ECM electrical connector EN16 and the accelerator pedal electrical connector PA1.
Measure the resistance between EN16-103 and PA1-6.
Measure the resistance between EN16-102 and PA1-3.
Is the resistance less than 5 ohms?
Yes
DIAGNOSE the electronic engine control system. For additional information, refer toSection
303-14A Electronic Engine
Controls
Section
303-14B Electronic Engine Controls
.
No
REPAIR the accelerator pedal demand sensor circuit from the ECM to the accelerator pedal. CLEAR the DTC. TEST the
system for normal operation.
PINPOINT TEST C : DTC P0121, P0122, P0123
TEST
CONDITIONS
DETAILS/RESULTS/ACTIONS
C1: CHECK THE POWER SUPPLY TO THE THROTTLE POSITION SENSOR
Turn the ignition switch the to the RUN position.
Measure the voltage between the throttle position sensor electrical connector EN13-4 and ground.
Is the voltage less than 4.5 volts?
Yes
GO to C2
. .
No
GO to C4
. .
C2: CHECK THE THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT
Turn the ignition switch to the OFF position.
Disconnect the ECM electrical connector EN16 and the throttle position sensor electrical connector EN13.
Measure the resistance between EN16-12 and EN13-4.
Is the resistance less than 5 ohms?
Yes
GO to C3
. .
No
REPAIR the throttle position sensor power supply circuit from the ECM to the throttle position sensor. CLEAR the
DTC. TEST the system for normal operation.
C3: CHECK THE THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT FOR A SHORT TO GROUND
Measure the resistance between EN13-4 and ground.
Is the resistance greater than 10,000 ohms?
Yes
DIAGNOSE the electronic engine control system. For additional information, refer toSection
303-14A Electronic Engine
Controls
Section
303-14B Electronic Engine Controls
.
No
REPAIR the throttle position sensor power supply circuit from the ECM to the throttle position sensor. CLEAR the
DTC. TEST the system for normal operation.
C4: CHECK THE THROTTLE POSITION SENSOR GROUND CIRCUIT
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3
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3
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2
Turn the ignition switch to the OFF position.
Disconnect the throttle position sensor electrical connector EN13.
Measure the resistance between EN13-1 and ground.
Is the resistance less than 5 ohms?
Yes
GO to C6
. .
No
GO to C5
. .
C5: CHECK THE THROTTLE POSITION SENSOR GROUND WIRE FOR OPEN CIRCUIT
Disconnect the ECM electrical connector EN16 and the throttle position sensor electrical connector EN13.
Measure the resistance between EN16-13 and EN13-1.
Is the resistance less than 5 ohms?
Yes
GO to C6
. .
No
REPAIR the throttle position sensor ground circuit from the ECM to the throttle position sensor. CLEAR the DTC. TEST
the system for normal operation.
C6: CHECK THE THROTTLE POSITION SENSOR
Measure the resistance between EN13-2 and EN13-4.
Measure the resistance between EN13-3 and EN13-4.
Are the resistor values the same?
Yes
GO to C7
. .
No
INSTALL a new throttle position sensor. For additional information refer toSection
303-14A Electronic Engine
Controls
Section
303-14B Electronic Engine Controls
.
C7: CHECK CONTINUITY OF THE THROTTLE POSITION SENSOR OUTPUT CIRCUIT
Measure the resistance between EN16-75 and EN13-3.
Measure the resistance between EN16-76 and EN13-2.
Is the resistance less than 5 ohms?
Yes
GO to C8
. .
No
REPAIR the circuit from the ECM to the throttle position sensor. CLEAR the DTC. TEST the system for normal
operation.
C8: CHECK THE THROTTLE POSITION SENSOR OUTPUT CIRCUIT FOR A SHORT TO GROUND
Measure the resistance between EN13-3 and ground.
Measure the resistance between EN13-2 and ground.
Is the resistance greater than 10,000 ohms?
Yes
DIAGNOSE the electronic engine control system. For additional information, refer toSection
303-14A Electronic Engine
Controls
Section
303-14B Electronic Engine Controls
.
No
REPAIR the circuit from the ECM to the throttle position sensor. CLEAR the DTC. TEST the system for normal
operation.
PINPOINT TEST D : DTC P1251, P1658, P1631, P1657
TEST
CONDITIONS
DETAILS/RESULTS/ACTIONS
D1: CHECK THE THROTTLE MOTOR RELAY
Turn the ignition switch to the RUN position.
Does the throttle relay make an audible click?
Yes
GO to D2
. .
No
GO to D8
. .
D2: CHECK THE ECM POWER SUPPLY FROM THE THROTTLE MOTOR RELAY
Measure the voltage between the throttle motor relay connector JB34-138 and ground.
Is the voltage greater than 10 volts?
Yes
GO to D3
. .
No
GO to D4
. .
D3: CHECK CONTINUITY OF THE ECM POWER SUPPLY WIRE FROM THE THROTTLE MOTOR RELAY
Turn the ignition switch to the OFF position.
Disconnect the ECM electrical connector EN16 and remove the throttle motor relay.
Measure the resistance between the throttle motor relay electrical connector JB34-138 and the ECM electrical
connector EN16-134.
Is the resistance less than 5 ohms?
Yes
DIAGNOSE the electronic engine control system. For additional information, refer toSection
303-14A Electronic Engine
Controls
Section
303-14B Electronic Engine Controls
.
No
REPAIR the ECM power supply wire from the throttle motor relay. CLEAR the DTC. TEST the system for normal
operation.
D4: CHECK FUSE 33 IN THE ENGINE COMPARTMENT FUSE BOX.
Check the fuse.
Is the fuse OK?
Yes
GO to D5
. .
No
GO to D6
. .
D5: CHECK THE THROTTLE MOTOR RELAY POWER SUPPLY CIRCUIT
Remove the throttle motor relay.
Measure the voltage between the throttle motor relay connector JB34-139 and ground.
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1
1
2
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2
1
1
2
1
2
1
2
3
Is the voltage less than 10 volts?
Yes
REPAIR the throttle motor relay power supply circuit. CLEAR the DTC. TEST the system for normal operation.
No
INSTALL a new throttle motor relay. CLEAR the DTC. TEST the system for normal operation.
D6: CHECK FUSE 33 FOR A SHORT TO GROUND
Measure the resistance between fuse 33 and ground.
Is the resistance greater than 10,000 ohms?
Yes
INSTALL a new fuse. CLEAR the DTC. TEST the system for normal operation.
No
REPAIR short to ground between engine compartment fuse box and the throttle motor relay. INSTALL a new fuse.
CLEAR the DTC. TEST the system for normal operation.
D7: CHECK FUSE 36 IN THE ENGINE COMPARTMENT FUSE BOX
Check the fuse.
Is the fuse OK?
Yes
GO to D7
. .
No
GO to D10
. .
D8: CHECK THE POWER SUPPLY CIRCUIT TO THE THROTTLE MOTOR RELAY COIL
Turn the ignition switch to the RUN position.
Measure the voltage between the throttle motor relay connector JB34-137 and ground.
Is the voltage greater than 10 volts?
Yes
GO to D11
. .
No
GO to D9
. .
D9: CHECK CONTINUITY OF THE POWER SUPPLY CIRCUIT TO THE THROTTLE MOTOR RELAY COIL
Disconnect the ECM electrical connector EN16 and remove the throttle motor relay.
Measure the resistance between the throttle motor relay electrical connector JB34-137 and the ECM electrical
connector EN16-52.
Is the resistance less than 5 ohms?
Yes
GO to D11
. .
No
REPAIR the throttle motor relay coil power supply circuit from the engine compartment fuse box. CLEAR the DTC.
TEST the system for normal operation.
D10: CHECK FUSE 36 OF THE PASSENGER COMPARTMENT FUSE BOX FOR A SHORT TO GROUND
Measure the resistance between fuse 36 of the passenger compartment fuse box and ground.
Is the resistance less than 10,000 ohms?
Yes
REPAIR short to ground between the engine compartment fuse box and the throttle motor relay coil. CLEAR the DTC.
TEST the system for normal operation.
No
INSTALL a new fuse. CLEAR the DTC. TEST the system for normal operation.
D11: CHECK CONTINUITY OF THE THROTTLE MOTOR RELAY COIL
Remove the throttle motor relay (if not already removed).
Measure the resistance between terminal 1 and terminal 2 of the throttle motor relay.
Is the resistance between 70 and 90 ohms?
Yes
GO to D12
. .
No
INSTALL a new throttle motor relay. CLEAR the DTC. TEST the system for normal operation.
D12: CHECK CONTINUITY OF THE THROTTLE MOTOR RELAY GROUND CIRCUIT
Disconnect the ECM electrical connector EN16.
Measure the resistance between the throttle motor relay electrical connector JB34-135 and the ECM electrical
connector EN16-52.
Is the resistance less than 5 ohms?
Yes
DIAGNOSE the electronic engine control system. For additional information, refer toSection
303-14A Electronic Engine
Controls
Section
303-14B Electronic Engine Controls
.
No
REPAIR the throttle motor relay ground circuit from the ECM to the engine compartment fuse box. CLEAR the DTC.
TEST the system for normal operation.
PINPOINT TEST E : DTC P1254, P1250
TEST
CONDITIONS
DETAILS/RESULTS/ACTIONS
E1: CHECK THE ACCELERATOR PEDAL DEMAND SENSOR GROUND CIRCUIT
Disconnect the ECM electrical connector EN16 and the accelerator pedal electrical connector PA1.
Measure the resistance between EN16-19 and PA1-1.
Measure the resistance between EN16-20 and PA1-2.
Is the resistance less than 5 ohms?
Yes
DIAGNOSE the electronic engine control system. For additional information, refer toSection
303-14A Electronic Engine
Controls
Section
303-14B Electronic Engine Controls
.
No
REPAIR the accelerator pedal demand sensor ground circuit from the accelerator pedal to the ECM. CLEAR the DTC.
TEST the system for normal operation.
Published: 11-May-2011
Acceleration Control - Accelerator Cable Adjustment2.0L NA V6 - AJV6
General Procedures
1. Remove the primary cable retaining clip.
2. NOTE: Make sure the accelerator cable is seated fully in the retaining
bracket.
Fully depress the accelerator pedal and hold down.
3. NOTE: Make sure the throttle actuator is in the fully open position.
Install the retaining clip.
4. Release the accelerator pedal.
5. Fully depress the accelerator pedal and hold down.
6. If the accelerator actuator is not in the fully open position, repeat the
above procedure.
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