Jaguar XJ (X350). Manual — part 1008

GO to Pinpoint Test G549822t147.

G549822t147 : CHECK THE MAP SENSOR RETURN CIRCUIT FOR HIGH
RESISTANCE

1. Key off. 2. Disconnect the MAP sensor connector, C31. 3. Measure the resistance between:

C31, harness side

Battery

Pin 03

Negative terminal

Is the resistance less than 10 ohms?

-> Yes

GO to Pinpoint Test G549822t148.

-> No

GO to Pinpoint Test G549822t159.

G549822t148 : CHECK THE SUPPLY TO THE MAP SENSOR

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

C31, harness side

Battery

Pin 01

Negative terminal

Is the voltage between 4.8 - 5.2 volts?

-> Yes

GO to Pinpoint Test G549822t149.

-> No

GO to Pinpoint Test G549822t156.

G549822t149 : CHECK THE MAP SIGNAL CIRCUIT FOR SHORT CIRCUIT TO
GROUND

1. Measure the resistance between:

C31, harness side

Battery

Pin 02

Negative terminal

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G549822t150.

-> No

GO to Pinpoint Test G549822t153.

G549822t150 : CHECK THE MAP SIGNAL CIRCUIT FOR SHORT CIRCUIT TO
POWER

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

C31, harness side

Battery

Pin 02

Positive terminal

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G549822t151.

-> No

GO to Pinpoint Test G549822t154.

G549822t151 : CHECK THE MAP SIGNAL CIRCUIT FOR SHORT CIRCUIT TO
RETURN AND SUPPLY CIRCUITS

1. Measure the resistance between:

C31, harness side C31, harness side

Pin 02

Pin 01

Pin 02

Pin 03

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Are the resistances greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G549822t152.

-> No

GO to Pinpoint Test G549822t155.

G549822t152 : CHECK THE MAP SIGNAL CIRCUIT FOR HIGH RESISTANCE

1. Key off. 2. Disconnect the ECM connector, C101. 3. Measure the resistance between:

C31, harness side C101, harness side

Pin 02

Pin C1

Is the resistance 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): - MAP connector - MAP 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.

G549822t153 : CHECK WHETHER THE SHORT CIRCUIT TO GROUND IS IN
THE HARNESS OR THE MODULE

1. Key off. 2. Disconnect the ECM connector, C101. 3. Key on, engine off. 4. Measure the resistance

between:

C31, harness side

Battery

Pin 02

Negative terminal

Is the resistance greater than 100 Kohms?

-> Yes

Suspect: - ECM

-> No

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

the system for normal operation.

G549822t154 : CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE
HARNESS OR THE MODULE

1. Key off. 2. Disconnect the ECM connector, C101. 3. Key on, engine off. 4. Measure the resistance

between:

C31, harness side

Battery

Pin 02

Positive terminal

Is the resistance greater than 100 Kohms?

-> Yes

Suspect: - ECM

-> No

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

the system for normal operation.

G549822t155 : CHECK WHETHER THE SHORT CIRCUIT IS IN THE HARNESS
OR THE MODULE

1. Key off. 2. Disconnect the ECM connector, C101. 3. Measure the resistance between:

C31, harness side C31, harness side

Pin 02

Pin 01

Pin 02

Pin 03

Are the resistances greater than 100 Kohms?

-> Yes

Suspect: - ECM

-> 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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