Jaguar XJ (X350). Manual — part 917

G258127t113 : CHECK THE FUEL RAIL PRESSURE (FRP) SENSOR SUPPLY
VOLTAGE CIRCUIT FOR SHORT TO HIGH VOLTAGE

1. Turn the ignition switch to the ON position. 2. Measure the voltage between PI28, pin 02 (OY) and

GROUND.

Is the voltage greater than 6 volts?

-> Yes

REPAIR the short circuit to high voltage. For additional information, refer to the wiring diagrams.

CLEAR the DTC. TEST the system for normal operation.

-> No

GO to Pinpoint Test G258127t114.

G258127t114 : CHECK THE FUEL RAIL PRESSURE (FRP) SENSOR SUPPLY
VOLTAGE CIRCUIT FOR SHORT TO GROUND

1. Turn the ignition switch to the OFF position. 2. Measure the resistance between PI28, pin 02 (OY)

and GROUND.

Is the resistance less than 10,000 ohms?

-> Yes

REPAIR the short circuit to GROUND. For additional information, refer to the wiring diagrams. CLEAR

the DTC. TEST the system for normal operation.

-> No

Check for DTCs relating to individual sensors, and/or sensor GROUND. Carry out pinpoint tests for

sensors indicated.

PINPOINT TEST G258127p26 : DTC
P1243; SENSOR GROUND CIRCUITS
OPEN CIRCUIT

G258127t115 : CHECK THE SENSOR GROUND AT THE THROTTLE POSITION
(TP) SENSORS

1. Disconnect the throttle sensor electrical connector, PI26. 2. Measure the resistance between PI26,

pin 01 (BG) and GROUND.

Is the resistance greater than 5 ohms?

-> Yes

GO to Pinpoint Test G258127t116.

-> No

GO to Pinpoint Test G258127t117.

G258127t116 : CHECK THE THROTTLE POSITION (TP) SENSOR GROUND
CIRCUIT FOR HIGH RESISTANCE

1. Disconnect the ECM electrical connector, PI01. 2. Measure the resistance between PI26, pin 01

(BG) and PI01, pin 19 (BG).

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 G258127t117.

G258127t117 : CHECK THE SENSOR GROUND AT THE ACCELERATOR PEDAL
POSITION (APP) SENSOR

1. Disconnect the APP sensor electrical connector, CR14. 2. Reconnect the ECM electrical connector,

PI01. 3. Measure the resistance between CR14, pin 06 (BG) and GROUND.

Is the resistance greater than 5 ohms?

-> Yes

GO to Pinpoint Test G258127t118.

-> No

GO to Pinpoint Test G258127t119.

G258127t118 : CHECK THE ACCELERATOR PEDAL POSITION (APP) SENSOR
GROUND CIRCUIT FOR HIGH RESISTANCE

1. Disconnect the ECM electrical connector, PI01. 2. Measure the resistance between CR14, pin 06

(BG) and PI01, pin 19 (BG).

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.

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-> No

GO to Pinpoint Test G258127t119.

G258127t119 : CHECK THE SENSOR GROUND AT THE FUEL TANK PRESSURE
(FTP) SENSOR

1. Disconnect the FTP sensor electrical connector, FP01. 2. Reconnect the ECM electrical connector,

PI01. 3. Measure the resistance between FP01, pin 01 (BG) and GROUND.

Is the resistance greater than 5 ohms?

-> Yes

GO to Pinpoint Test G258127t120.

-> No

GO to Pinpoint Test G258127t121.

G258127t120 : CHECK THE FUEL TANK PRESSURE (FTP) SENSOR GROUND
CIRCUIT FOR HIGH RESISTANCE

1. Disconnect the ECM electrical connector, PI01. 2. Measure the resistance between FP01, pin 01

(BG) and PI01, pin 19 (BG).

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 G258127t121.

G258127t121 : CHECK THE SENSOR GROUND AT THE ENGINE COOLANT
TEMPERATURE (ECT) SENSOR

1. Reconnect the ECM electrical connector, PI01. 2. Disconnect the ECT sensor electrical connector,

PI25. 3. Measure the resistance between PI25, pin 01 (BG) and GROUND.

Is the resistance greater than 5 ohms?

-> Yes

GO to Pinpoint Test G258127t122.

-> No

GO to Pinpoint Test G258127t123.

G258127t122 : CHECK THE ENGINE COOLANT TEMPERATURE (ECT) SENSOR
GROUND CIRCUIT FOR HIGH RESISTANCE

1. Disconnect the ECM electrical connector, PI01. 2. Measure the resistance between PI25, pin 01

(BG) and PI01, pin 19 (BG).

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 G258127t123.

G258127t123 : CHECK THE SENSOR GROUND AT THE MANIFOLD ABSOLUTE
PRESSURE (MAP) SENSOR

1. Disconnect the MAP sensor electrical connector, PI29. 2. Reconnect the ECM electrical connector,

PI01. 3. Measure the resistance between PI29, pin 04 (BG) and GROUND.

Is the resistance greater than 5 ohms?

-> Yes

GO to Pinpoint Test G258127t124.

-> No

GO to Pinpoint Test G258127t125.

G258127t124 : CHECK THE MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR
GROUND CIRCUIT FOR HIGH RESISTANCE

1. Disconnect the ECM electrical connector, PI01. 2. Measure the resistance between PI29, pin 04

(BG) and PI01, pin 19 (BG).

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

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