Jaguar XJ (X350). Service manual — part 940

Pin 03

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

INSTALL a new H02S.

Heated Oxygen Sensor (HO2S) 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 G531332p7 : RIGHT-
HAND H02S HEATER CONTROL
CIRCUIT HIGH/LOW CURRENT

G531332t23 : CHECK H02S HEATER POWER SUPPLY CIRCUIT

1. Key off. 2. Disconnect the H02S electrical connector, PI10. 3. Key on, engine off. 4. Make sure the

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

HO2S connector PI10, harness side

Battery

Pin 01

Negative terminal

Is the voltage greater than 10 volts?

-> Yes

GO to Pinpoint Test G531332t24.

-> No

REPAIR the power supply circuit to the H02S heater. This circuit includes the HO2S 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.

G531332t24 : CHECK H02S HEATER CONTROL CIRCUIT FROM ECM FOR
HIGH RESISTANCE

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

HO2S connector PI10, harness side ECM connector PI300, harness side

Pin 02

Pin 76

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 G531332t25.

G531332t25 : CHECK H02S HEATER CONTROL CIRCUIT FROM ECM FOR
SHORT CIRCUIT TO POWER

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

HO2S connector PI10, harness side

Battery

Pin 02

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 G531332t26.

G531332t26 : CHECK H02S HEATER CONTROL CIRCUIT FROM ECM FOR
SHORT CIRCUIT TO GROUND

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

HO2S connector PI10, harness side

Battery

Pin 02

Negative terminal

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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

INSTALL a new H02S.

Heated Oxygen Sensor (HO2S) 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 G531332p8 : RIGHT-
HAND CATALYST MONITOR SENSOR
SENSING CIRCUIT LOW/HIGH
VOLTAGE, NO ACTIVITY

G531332t27 : CHECK THE CATALYST MONITOR SENSOR SENSING CIRCUIT
FOR HIGH RESISTANCE

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

ECM electrical connector, PI300. 4. Measure the resistance between:

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

Pin 04

Pin 40

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 G531332t28.

G531332t28 : CHECK THE CATALYST MONITOR SENSOR SENSING CIRCUIT
FOR SHORT CIRCUIT TO POWER

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

Catalyst monitor sensor connector PI11, 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 G531332t29.

G531332t29 : CHECK THE CATALYST MONITOR SENSOR SENSING CIRCUIT
FOR SHORT CIRCUIT TO GROUND

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

Catalyst monitor sensor connector PI11, 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 G531332t30.

G531332t30 : CHECK THE CATALYST MONITOR SENSOR GROUND CIRCUIT
FOR HIGH RESISTANCE

1. Measure the resistance between:

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

Pin 03

Pin 22

Is the resistance greater than 5 ohms?

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