Jaguar XJ (X350). Manual — part 955

PRESSURE/TEMPERATURE (MAPT)
SENSOR PRESSURE SENSING CIRCUIT

G531332t101 : CHECK THE POWER SUPPLY TO THE MAPT SENSOR

1. Key off. 2. Disconnect the MAPT connector, PI310. 3. Key on, engine off. 4. Measure the voltage

between:

MAPT sensor connnector PI310, harness side

Battery

Pin 02

Negative terminal

Is the voltage greater than 4 volts?

-> Yes

GO to Pinpoint Test G531332t102.

-> No

CHECK the circuit between the MAPT sensor, pin 02 and the ECM. Refer to the warranty policy and

procedures manual if an ECM is suspect.

G531332t102 : CHECK THE GROUND TO THE MAPT SENSOR

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

MAPT sensor connnector PI310, harness side

Battery

Pin 04

Negative terminal

Is the resistance greater than 5 ohms?

-> Yes

REPAIR the high resistance circuit. This circuit includes splice PIS49 and the ECM. For additional

information, refer to the wiring diagrams. CLEAR the DTC. TEST the system for normal operation.

Refer to the warranty policy and procedures manual if an ECM is suspect.

-> No

GO to Pinpoint Test G531332t100.

G531332t100 : CHECK THE MAPT PRESSURE SENSING CIRCUIT FOR SHORT
CIRCUIT TO GROUND

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

MAPT sensor connnector PI310, harness side

Battery

Pin 01

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 G531332t103.

G531332t103 : CHECK THE MAPT PRESSURE SENSING CIRCUIT FOR SHORT
CIRCUIT TO POWER

1. Measure the resistance between:

MAPT sensor connnector PI310, harness side

Battery

Pin 01

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.

TEST the system for normal operation.

-> No

GO to Pinpoint Test G531332t104.

G531332t104 : CHECK THE MAPT PRESSURE SENSING CIRCUIT FOR HIGH
RESISTANCE

1. Measure the resistance between:

MAPT sensor connnector PI310, harness side ECM connector PI300, harness side

www.

Pin 01

Pin 69

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. Refer to the warranty policy and procedures manual if an

ECM is suspect.

-> No

INSTALL a new MAPT sensor. CLEAR the DTC. TEST the system for normal operation.

PINPOINT TEST G531332p42 : BRAKE
SWITCH

G531332t105 : CHECK THE OPERATION OF THE BRAKE SWITCH (PEDAL
RELEASED)

1. Key off. 2. Disconnect the brake switch electrical connector, CR78. 3. Make sure the brake pedal is

not pressed. 4. Measure the resistance between:

Brake switch connector CR78, component side Brake switch connector CR78, component side

Pin 01

Pin 02

Is the resistance greater than 10 ohms?

-> Yes

GO to Pinpoint Test G531332t106.

-> No

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

G531332t106 : CHECK THE OPERATION OF THE BRAKE SWITCH (PEDAL
PRESSED)

1. Press the brake pedal. 2. Measure the resistance between:

Brake switch connector CR78, component side Brake switch connector CR78, component side

Pin 01

Pin 02

Is the resistance greater than 10 ohms?

-> Yes

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

-> No

GO to Pinpoint Test G531332t107.

G531332t107 : CHECK THE POWER SUPPLY TO THE BRAKE PEDAL SWITCH

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

Brake switch connector CR78, harness side

Battery

Pin 01

Negative terminal

Is the voltage less than 10 volts?

-> Yes

REPAIR the circuit between the brake switch and battery. This circuit includes fuse 44 of the primary

junction box. For additional information, refer to the wiring diagrams. CLEAR the DTC, test the

system for normal operation.

-> No

GO to Pinpoint Test G531332t108.

G531332t108 : CHECK THE BRAKE SWITCH SIGNAL CIRCUIT FOR SHORT
CIRCUIT TO GROUND

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

Brake switch connector CR78, harness side

Battery

Pin 02

Negative terminal

Is the resistance less than 10,000 ohms?

www.