Jaguar XJ (X350). Manual — part 861

G531330t4 : CHECK THE MAF SENSOR SUPPLY CIRCUIT VOLTAGE

1. Disconnect the MAF sensor electrical connector, PI14. 2. Key on, engine off. 3. Measure the

voltage between:

MAF sensor connector PI14, harness side

Battery

Pin 01

Negative terminal

Is the voltage greater than 10 volts?

-> Yes

GO to Pinpoint Test G531330t3.

-> No

REPAIR the circuit between the MAF sensor electrical connector and the battery. This circuit includes

the EMS control relay and fuse 14 of the front power distribution box. For additional information,

refer to the wiring diagrams. CLEAR the DTC and test the system for normal operation.

G531330t3 : CHECK THE MAF SENSOR SENSING CIRCUIT FOR SHORT
CIRCUIT TO GROUND

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

MAF sensor connector PI14, harness side

Battery

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 and

test the system for normal operation.

-> No

GO to Pinpoint Test G531330t2.

G531330t2 : CHECK THE MAF SENSOR SENSING CIRCUIT FOR SHORT
CIRCUIT TO POWER

1. Measure the resistance between:

MAF sensor connector PI14, harness side

Battery

Pin 03

Positive 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 and

test the system for normal operation.

-> No

GO to Pinpoint Test G531330t82.

G531330t82 : CHECK THE MAF SENSOR GROUND CIRCUIT FOR SHORT
CIRCUIT TO POWER

1. Measure the resistance between:

MAF sensor connector PI14, harness side

Battery

Pin 02

Positive 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 and

test the system for normal operation.

-> No

GO to Pinpoint Test G531330t1.

G531330t1 : CHECK THE MAF SENSOR SENSING CIRCUIT FOR HIGH
RESISTANCE

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

MAF sensor connector PI14, harness side ECM connector PI300, harness side

Pin 03

Pin 70

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Is the resistance greater than 5 ohms?

-> Yes

REPAIR the high resistance circuit. For additional information, refer to the wiring diagrams. CLEAR the

DTC and test the system for normal operation.

-> No

GO to Pinpoint Test G531330t81.

G531330t81 : CHECK THE MAF SENSOR GROUND CIRCUIT FOR HIGH
RESISTANCE

1. Measure the resistance between:

MAF sensor connector PI14, harness side ECM connector PI300, harness side

Pin 02

Pin 18

Is the resistance greater than 5 ohms?

-> Yes

REPAIR the high resistance circuit. For additional information, refer to the wiring diagrams. CLEAR the

DTC and test the system for normal operation.

-> No

INSTALL a new MAF sensor.

Mass Air Flow (MAF) Sensor (18.30.15) CLEAR the DTC and test the system for normal operation.

PINPOINT TEST G531330p2 : INTAKE
AIR TEMPERATURE (IAT) SENSOR
CIRCUIT

G531330t7 : CHECK THE IAT SENSOR SENSING CIRCUIT FOR SHORT CIRCUIT
TO GROUND

1. Disconnect the MAF sensor electrical connector, PI14. 2. Measure the resistance between:

MAF sensor connector PI14, 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 and

test the system for normal operation.

-> No

GO to Pinpoint Test G531330t6.

G531330t6 : CHECK THE IAT SENSOR SENSING CIRCUIT FOR SHORT CIRCUIT
TO POWER

1. Measure the resistance between:

MAF sensor connector PI14, harness side

Battery

Pin 04

Positive 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 and

test the system for normal operation.

-> No

GO to Pinpoint Test G531330t5.

G531330t5 : CHECK THE IAT SENSOR SENSING CIRCUIT FOR HIGH
RESISTANCE

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

MAF sensor connector PI14, harness side ECM connector PI300, harness side

Pin 04

Pin 66

Is the resistance greater than 5 ohms?

-> Yes

REPAIR the high resistance circuit. For additional information, refer to the wiring diagrams. CLEAR the

DTC and test the system for normal operation.

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