Jaguar XJ (X350). Manual — part 909

Is the voltage greater than 3 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 G258127t26.

G258127t26 : CHECK H02S HEATER CONTROL CIRCUIT FROM ECM FOR
SHORT TO GROUND

1. Turn the ignition switch to the OFF position. 2. Measure the resistance between PI10, pin 02 (RU)

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

INSTALL a new H02S.

CLEAR the DTC. TEST the system for normal operation. If the DTC is repeated, contact dealer

technical support for advice on possible ECM failure.

PINPOINT TEST G258127p8 : DTC
P0137, P0138, P0140; RIGHT-HAND
CATALYST MONITOR SENSOR
SENSING CIRCUIT LOW/HIGH
VOLTAGE, NO ACTIVITY

G258127t27 : CHECK THE CATALYST MONITOR SENSOR SENSING CIRCUIT
FOR HIGH RESISTANCE

1. Disconnect the battery negative terminal. 2. Disconnect the H02S electrical connector, PI11. 3.

Disconnect the ECM electrical connector, PI01. 4. Measure the resistance between PI11, pin 04 (N)

and PI01, pin 128 (N).

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 G258127t28.

G258127t28 : CHECK THE CATALYST MONITOR 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 PI11, pin 04 (N) and GROUND.

Is the voltage greater than 5 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 G258127t29.

G258127t29 : CHECK THE CATALYST MONITOR SENSOR SENSING CIRCUIT
FOR SHORT TO GROUND

1. Turn the ignition switch to the OFF position. 2. Measure the resistance between PI11, pin 04 (N)

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

GO to Pinpoint Test G258127t30.

G258127t30 : CHECK THE CATALYST MONITOR SENSOR GROUND CIRCUIT
FOR HIGH RESISTANCE

1. Measure the resistance between PI11, pin 03 (B) and PI01, pin 130 (BW).

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

INSTALL a new catalyst monitor sensor.

CLEAR the DTC. TEST the system for normal operation.

PINPOINT TEST G258127p9 : DTC
P0037, P0038; RIGHT-HAND CATALYST
MONITOR SENSOR HEATER CONTROL
CIRCUIT LOW/HIGH RESISTANCE

G258127t31 : CHECK THE POWER SUPPLY TO THE CATALYST MONITOR
HEATER

1. Disconnect the catalyst monitor sensor electrical connector, PI11. 2. Turn the ignition switch to the

ON position. 3. Make sure the O2S heater relay is engaged. 4. Measure the voltage between PI11, pin

01 (WG) and GROUND.

Is the voltage greater than 10 volts?

-> Yes

GO to Pinpoint Test G258127t32.

-> No

REPAIR the power supply circuit to the catalyst monitor sensor heater. This circuit includes the heater

relay, fuse 34 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.

G258127t32 : CHECK THE CATALYST MONITOR HEATER CONTROL CIRCUIT
FOR HIGH RESISTANCE

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

Measure the resistance between PI11, pin 02 (UY) and PI01, pin 92 (UY).

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

INSTALL a new catalyst monitor sensor.

CLEAR the DTC. TEST the system for normal operation. If the DTC is repeated, contact dealer

technical support for advice on possible ECM failure.

PINPOINT TEST G258127p10 : DTC
P0151, P0152, P0153; LEFT-HAND H02S
SENSING CIRCUIT LOW/HIGH
CURRENT, SLOW RESPONSE, ECM
CONTROL MALFUNCTION

G258127t33 : CHECK THE H02S VARIABLE CIRCUIT FOR HIGH RESISTANCE

1. Disconnect the battery negative terminal. 2. Disconnect the H02S electrical connector, PI12. 3.

Disconnect the ECM electrical connector, PI01. 4. Measure the resistance between PI12, pin 03 (G)

and PI01, pin 107 (G).

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 G258127t34.

G258127t34 : CHECK THE H02S VARIABLE 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 PI12, pin 03 (G) and GROUND.

Is the voltage greater than 3 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 G258127t35.

G258127t35 : CHECK THE H02S VARIABLE CIRCUIT FOR SHORT TO GROUND

1. Turn the ignition switch to the OFF position. 2. Measure the resistance between PI12, pin 03 (G)

and GROUND.

Is the resistance less than 10,000 ohms?

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