Jaguar XJ (X350). Manual — part 941

-> 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.

Catalyst Monitor Sensor (18.30.66) CLEAR the DTC. TEST the system for normal operation.

PINPOINT TEST G531332p9 : RIGHT-
HAND CATALYST MONITOR SENSOR
HEATER CONTROL CIRCUIT
LOW/HIGH RESISTANCE

G531332t31 : CHECK THE POWER SUPPLY TO THE CATALYST MONITOR
HEATER

1. Key off. 2. Disconnect the catalyst monitor sensor electrical connector, PI11. 3. Key on, engine off.

4. Make sure the O2S heater relay is engaged. 5. Measure the voltage between:

Catalyst monitor sensor connector PI11, harness side

Battery

Pin 02

Negative terminal

Is the voltage greater than 10 volts?

-> Yes

GO to Pinpoint Test G531332t32.

-> No

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

relay and fuse 33 of the front power distribution box. For additional information, refer to the wiring

diagrams. CLEAR the DTC. TEST the system for normal operation.

G531332t32 : CHECK THE CATALYST MONITOR HEATER CONTROL CIRCUIT
FOR HIGH RESISTANCE

1. Key off. 2. Disconnect the ECM electrical connector, PI300. 3. Measure the resistance between:

Catalyst monitor sensor connector PI11, harness side ECM connector PI300, harness side

Pin 02

Pin 88

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.

Catalyst Monitor Sensor (18.30.66) CLEAR the DTC. TEST the system for normal operation. If the DTC

is repeated, refer to the warranty policy and procedures manual if an ECM is suspect.

PINPOINT TEST G531332p10 : LEFT-
HAND H02S SENSING CIRCUIT
LOW/HIGH CURRENT, SLOW
RESPONSE, ECM CONTROL
MALFUNCTION

G531332t33 : CHECK THE H02S VARIABLE CIRCUIT FOR HIGH RESISTANCE

1. Key off. 2. Disconnect the H02S electrical connector, PI12. 3. Disconnect the ECM electrical

connector, PI300. 4. Measure the resistance between:

HO2S connector PI12, harness side ECM connector PI300, harness side

Pin 04

Pin 26

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 G531332t34.

www.

G531332t34 : CHECK THE H02S VARIABLE CIRCUIT FOR SHORT CIRCUIT TO
POWER

1. Key on, engine off. 2. Measure the voltage between:

HO2S connector PI12, harness side

Battery

Pin 04

Negative terminal

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 G531332t35.

G531332t35 : CHECK THE H02S VARIABLE CIRCUIT FOR SHORT CIRCUIT TO
GROUND

1. Key off. 2. Measure the resistance between:

HO2S connector PI12, harness side

Battery

Pin 04

Negative terminal

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 G531332t36.

G531332t36 : CHECK THE H02S CONSTANT CIRCUIT FOR HIGH RESISTANCE

1. Measure the resistance between:

HO2S connector PI12, harness side ECM connector PI300, harness side

Pin 03

Pin 27

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 G531332t37.

G531332t37 : CHECK THE H02S CONSTANT CIRCUIT FOR SHORT CIRCUIT
TO POWER

1. Measure the voltage between:

HO2S connector PI12, harness side

Battery

Pin 03

Negative terminal

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 G531332t38.

G531332t38 : CHECK THE H02S CONSTANT CIRCUIT FOR SHORT CIRCUIT
TO GROUND

1. Measure the resistance between:

HO2S connector PI12, harness side

Battery

Pin 03

Negative terminal

Is the resistance less than 10,000 ohms?

www.