Jaguar XJ (X350). Manual — part 1007

-> Yes

GO to Pinpoint Test G549822t142.

-> No

INSTALL a new left hand bank MAF sensor.

Mass Air Flow (MAF) Sensor (18.30.15)

G549822t142 : CHECK THE SUPPLY TO THE MAF SENSOR

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

EC68, harness side

Battery

Pin 04

Negative terminal

Is the voltage between 9 - 15 volts?

-> Yes

GO to Pinpoint Test G549822t143.

-> No

REPAIR the ECM to left hand bank MAF sensor supply circuit as necessary. For additional information,

refer to the wiring diagrams. Clear any DTCs, test the system for normal operation.

G549822t143 : CHECK THE MAF SENSOR CIRCUIT(S) FOR SHORT CIRCUIT
TO GROUND

1. Key off. 2. Disconnect the ECM connector, EC66. 3. Key on, engine off. 4. Measure the resistance

between:

EC68, harness side

Battery

Pin 03

Negative terminal

Pin 01

Negative terminal

Are the resistances greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G549822t144.

-> No

REPAIR the short circuit. For additional information, refer to the wiring diagrams. Clear any DTCs, test

the system for normal operation.

G549822t144 : CHECK THE MAF SENSOR CIRCUIT(S) FOR SHORT CIRCUIT
TO POWER

1. Measure the resistance between:

EC68, harness side

Battery

Pin 03

Positive terminal

Pin 01

Positive terminal

Are the resistances greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G549822t145.

-> No

REPAIR the short circuit. For additional information, refer to the wiring diagrams. Clear any DTCs, test

the system for normal operation.

G549822t145 : CHECK THE MAF SIGNAL AND RETURN CIRCUITS FOR SHORT
CIRCUIT TO EACH OTHER

1. Measure the resistance between:

EC68, harness side EC68, harness side

Pin 01

Pin 03

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G549822t146.

-> No

REPAIR the short circuit. For additional information, refer to the wiring diagrams. Clear any DTCs, test

the system for normal operation.

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G549822t146 : CHECK THE MAF SENSOR CIRCUIT(S) FOR HIGH RESISTANCE

1. Key off. 2. Disconnect the ECM connector, EC66. 3. Measure the resistance between:

EC68, harness side EC66, harness side

Pin 03

Pin L4

Pin 01

Pin G4

Are the resistances less than 10 ohms?

-> Yes

An intermittent fault may be present in the wiring harness. Visually check for chaffed wires or other

physical damage to the harness. If no fault is found in the circuit, suspect the following

component(s): - MAF connector - MAF sensor - ECM connector - ECM

-> No

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

DTCs, test the system for normal operation.

PINPOINT TEST G549822p12 :
MANIFOLD ABSOLUTE PRESSURE
(MAP) SENSOR

G549822t244 : CHECK THE MAP SENSOR CONNECTOR FOR PHYSICAL
DAMAGE OR CORROSION

1.

Circuit

Pin

Manifold absolute pressure sensor - signal

02

Manifold absolute pressure sensor - power 01

Manifold absolute pressure sensor - return 03

2.

Circuit

Pin

Manifold absolute pressure sensor - signal

C1

Manifold absolute pressure sensor - power D1

Manifold absolute pressure sensor - return E2

3. Inspect the sensor for damage, correct fitment, connection, etc.

Is the sensor correctly installed and in good condition?

-> Yes

GO to Pinpoint Test G549822t243.

-> No

CHECK and rectify as necessary.

Manifold Absolute Pressure (MAP) Sensor (18.30.86)

G549822t243 : CHECK THE MAP PID VALUE

1. Key on, engine running. 2. Access the OBDII-Intake manifold absolute pressure PID using the Jaguar

approved diagnostic system or a scan tool. 3. Slowly increase the engine speed to 1,500 rpm while

monitoring the MAP reading.

Did the pressure increase smoothly as the engine speed was increased?

-> Yes

An intermittent fault may be present in the wiring harness. Visually check for chaffed wires or other

physical damage to the harness.

-> No

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