Jaguar XJ (X350). Manual — part 914

G258127t79 : CHECK THE BATTERY POWER SUPPLY TO THE ECM

1. Disconnect the ECM electrical connector, PI01. 2. Measure the voltage between PI01, pin 22 (NR)

and GROUND.

Is the voltage greater than 10 volts?

-> Yes

Recheck the DTCs.

-> No

REPAIR the battery power supply circuit. This circuit includes fuse 17 of the front power distribution

box, and the high power protection module. For additional information, refer to the wiring diagrams.

CLEAR the DTC. TEST the system for normal operation.

PINPOINT TEST G258127p21 : DTC
P1104; MASS AIR FLOW (MAF) SENSOR
GROUND MALFUNCTION

G258127t80 : CHECK THE MAF SENSOR GROUND

1. Disconnect the MAF sensor electrical connector, PI14. 2. Turn the ignition switch to the ON

position. 3. Measure the resistance between PI14, pin 02 (BK) and GROUND.

Is the resistance greater than 5 ohms?

-> Yes

GO to Pinpoint Test G258127t81.

-> No

INSTALL a new MAF sensor.

CLEAR the DTC. TEST the system for normal operation.

G258127t81 : CHECK THE MAF SENSOR GROUND CIRCUIT FOR HIGH
RESISTANCE

1. Disconnect the battery negative terminal. 2. Disconnect the ECM electrical connector, PI01. 3.

Measure the resistance between PI14, pin 02 (BK) and PI01, pins 45 and 46 (BK).

Is either 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 G258127t82.

G258127t82 : CHECK THE MAF SENSOR GROUND CIRCUIT FOR SHORT TO
HIGH VOLTAGE

1. Reconnect the battery negative terminal. 2. Turn the ignition switch to the ON position. 3.

Measure the voltage between PI14, pin 02 (BK) and GROUND.

Is the voltage greater than 3 volts?

-> Yes

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

TEST the system for normal operation.

-> No

Contact dealer technical support for advice on possible ECM failure.

PINPOINT TEST G258127p22 : DTC
P1122, P1123*; ACCELERATOR PEDAL
POSITION (APP) SENSOR SENSING
CIRCUIT 1 HIGH/LOW VOLTAGE

G258127t83 : CHECK THE APP SENSOR SENSING CIRCUIT 1 FOR HIGH
RESISTANCE

1. Disconnect the battery negative terminal. 2. Disconnect the ECM electrical connector, PI01. 3.

Disconnect the APP sensor electrical connector, CR14. 4. Measure the resistance between CR14, pin

01 (Y) and PI01, pin 103 (Y).

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 G258127t84.

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G258127t84 : CHECK THE APP SENSOR SENSING CIRCUIT FOR SHORT TO
HIGH VOLTAGE

1. Reconnect the battery negative terminal. 2. Turn the ignition switch to the ON position. 3.

Measure the voltage between CR14, pin 01 (Y) and GROUND.

Is the voltage greater than 3 volts?

-> Yes

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

TEST the system for normal operation.

-> No

GO to Pinpoint Test G258127t85.

G258127t85 : CHECK THE APP SENSOR SENSING CIRCUIT FOR SHORT TO
GROUND

1. Turn the ignition switch to the OFF position. 2. Measure the resistance between CR14, pin 01 (Y)

and GROUND.

Is the resistance less than 10,000 ohms?

-> Yes

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

TEST the system for normal operation.

-> No

GO to Pinpoint Test G258127t86.

G258127t86 : CHECK THE APP SENSOR SUPPLY VOLTAGE AT THE SENSOR

1. Reconnect the ECM electrical connector, PI01. 2. Turn the ignition switch to the ON position. 3.

Measure the voltage between CR14, pin 02 (OY) and GROUND.

Is the voltage less than 4 volts?

-> Yes

GO to Pinpoint Test G258127t87.

-> No

INSTALL a new APP sensor.

Accelerator Pedal (19.20.01) CLEAR the DTC. TEST the system for normal operation.

G258127t87 : CHECK THE APP SENSOR SUPPLY VOLTAGE CIRCUIT FOR
HIGH RESISTANCE

1. Turn the ignition switch to the OFF position. 2. Disconnect the ECM electrical connector, PI01. 3.

Measure the resistance between PI01, pin 12 (OY) and CR14, pin 02 (OY).

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

Check the ECM power supplies (recheck DTCs. P1104 may be flagged).

PINPOINT TEST G258127p23 : DTC
P1215, P1216*; ACCELERATOR PEDAL
POSITION (APP) SENSOR SENSING
CIRCUIT 2 HIGH/LOW VOLTAGE

G258127t88 : CHECK THE APP SENSOR SENSING CIRCUIT FOR HIGH
RESISTANCE

1. Disconnect the battery negative terminal. 2. Disconnect the ECM electrical connector, PI01. 3.

Disconnect the APP sensor electrical connector, CR14. 4. Measure the resistance between CR14, pin

04 (R) and PI01, pin 102 (R).

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 G258127t89.

G258127t89 : CHECK THE APP SENSOR SENSING CIRCUIT FOR SHORT TO
HIGH VOLTAGE

1. Reconnect the battery negative terminal. 2. Turn the ignition switch to the ON position. 3.

Measure the voltage between CR14, pin 04 (R) and GROUND.

Is the voltage greater than 3 volts?

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