Jaguar XJ (X350). Service manual — part 1020

-> No

INSTALL a new brake pedal switch. Clear any DTCs, test the system for normal operation.

G549822t245 : CHECK THE OPERATION OF THE BRAKE PEDAL SWITCH
WITH THE BRAKE PEDAL DEPRESSED

1. Make sure the brake pedal is depressed. 2. Measure the resistance between:

CR78, component side CR78, component side

Pin 01

Pin 02

Is the resistance less than 10 ohms?

-> Yes

GO to Pinpoint Test G549822t246.

-> No

INSTALL a new brake pedal switch. CLEAR the DTC, test the system for normal operation.

G549822t246 : CHECK FOR POWER TO THE BRAKE PEDAL SWITCH

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

CR78, harness side

Battery

Pin 01

Negative terminal

Is the voltage greater than 10 volts?

-> Yes

GO to Pinpoint Test G549822t247.

-> No

REPAIR the power supply circuit as necessary. For additional information, refer to the wiring

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

G549822t247 : CHECK THE BRAKE SWITCH SIGNAL CIRCUIT FOR SHORT
CIRCUIT TO GROUND

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

CR78, harness side

Battery

Pin 02

Negative terminal

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G549822t248.

-> No

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

the system for normal operation.

G549822t248 : CHECK THE BRAKE SWITCH SIGNAL CIRCUIT FOR SHORT
CIRCUIT TO POWER

1. Measure the resistance between:

CR78, harness side

Battery

Pin 02

Positive terminal

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G549822t249.

-> No

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

the system for normal operation.

G549822t249 : CHECK THE BRAKE SWITCH SIGNAL CIRCUIT FOR HIGH
RESISTANCE

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

CR78, harness side EC66, harness side

Pin 02

Pin G2

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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): - Brake pedal switch connector - Brake pedal switch - 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 G549822p19 : AIR
CONDITIONING (A/C) PRESSURE
SENSOR

G549822t253 : CHECK THE A/C PRESSURE SENSOR RETURN CIRCUIT FOR
HIGH RESISTANCE

1. Air conditioning (A/C) pressure sensor connector, EC101

Circuit

Pin

Air conditioning pressure sensor - return 01

Air conditioning pressure sensor - signal

02

Air conditioning pressure sensor - power 03

2. Engine control module (ECM) connector, EC66

Circuit

Pin

Air conditioning pressure sensor - return B3

Air conditioning pressure sensor - signal

F2

Air conditioning pressure sensor - power D3

3. Key off. 4. Disconnect the A/C pressure sensor connector, EC101. 5. Key on, engine off. 6. Measure

the resistance between:

EC101, harness side

Battery

Pin 01

Negative terminal

Is the resistance less than 10 ohms?

-> Yes

GO to Pinpoint Test G549822t256.

-> No

GO to Pinpoint Test G549822t254.

G549822t254 : CHECK THE A/C PRESSURE SENSOR RETURN CIRCUIT FOR
SHORT CIRCUIT TO POWER

1. Measure the resistance between:

EC101, harness side

Battery

Pin 01

Positive terminal

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G549822t255.

-> No

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

the system for normal operation.

G549822t255 : CHECK THE A/C PRESSURE SENSOR TO ECM RETURN
CIRCUIT FOR HIGH RESISTANCE

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

EC101, harness side EC66, harness side

Pin 01

Pin B3

Is the resistance less than 10 ohms?

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