Jaguar XJ (X350). Manual — part 740

GO to Pinpoint Test G557182t8.

G557182t8 : CHECK THE STARTER RELAY OUTPUT VOLTAGE AT THE FUSE
BOX

1. Key off. 2. Disconnect the front power distribution box connector, EC04. 3. Key on, engine

cranking. 4. Measure the voltage between:

EC04, component side

Battery

Pin 03

Negative terminal

Is the voltage less than 10 volts?

-> Yes

GO to Pinpoint Test G557182t6.

-> No

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

diagrams. Test the system for normal operation.

G557182t6 : CHECK THE IGNITION SWITCHED SUPPLY TO THE STARTER
RELAY

1. Key off. 2. Disconnect the front power distribution box connector, EC41. 3. Key on, engine

cranking. 4. Measure the voltage between:

EC41, harness side

Battery

Pin 01

Negative terminal

Is the voltage greater than 10 volts?

-> Yes

GO to Pinpoint Test G557182t9.

-> No

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

diagrams. Test the system for normal operation.

G557182t9 : CHECK THE STARTER RELAY COIL RESISTANCE

1. .

Coil temperature (degrees C) Coil temperature (degrees F) Coil resistance (ohms)

23

73

70 to 86

85

185

84 to 100

2. Key off. 3. Disconnect the front power distribution box connector, EC28. 4. Measure the resistance

between:

EC41, harness side EC28, harness side

Pin 01

Pin 08

Is the reading as expected for the current engine temperature? (Refer to the table)

-> Yes

GO to Pinpoint Test G557182t5.

-> No

INSTALL a new front power distribution box (the relay cannot be changed separately). Test the

system for normal operation.

G557182t5 : CHECK THE CRANK REQUEST SIGNAL TO THE ECM

1. Disconnect the engine control module connector:

Vehicle

Connector

3.0L/3.5L/4.2L VIN Range: G00442->G45703 PI1

3.0L/3.5L/4.2L VIN Range: G45704->G99999 EC300

2.7L Diesel

EC66

2. Key on, engine cranking. 3. Measure the voltage between:

ECM Connector Pin, harness side

Battery

www.

PI1

06

Negative terminal

EC300

17

EC66

F3

Is the voltage greater than 10 volts?

-> Yes

GO to Pinpoint Test G557182t7.

-> No

REPAIR the crank request circuit as necessary. For additional information, refer to the wiring

diagrams. Test the system for normal operation.

G557182t7 : CHECK THE STARTER RELAY CONTROL CIRCUIT FOR HIGH
RESISTANCE

1. Measure the resistance between:

ECM Connector Pin, harness side EC28, harness side

PI1

41

Pin 08

EC300

51

EC66

B1

Is the resistance less than 10 ohms?

-> Yes

CHECK for DTCs indicating a possible ECM or TCM fault. If no DTCs are set, 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): - Front power

distribution box connector. - Front power distribution box (starter relay). - ECM connector. - ECM.

-> No

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

system for normal operation.

PINPOINT TEST G557182p3 : THE
ENGINE CRANKS TOO SLOWLY

G557182t11 : CHECK THE VOLT DROP IN THE STARTER POSITIVE CIRCUIT

1. Connect a voltmeter between:

Starter motor

Battery

Permanent supply terminal Positive terminal

2. Key on, engine cranking.

Is the voltage greater than 0.5 volts?

-> Yes

CLEAN and tighten all battery cable connections. Test the system for normal operation. Check the

resistance of the battery cable, replace as necessary.

-> No

GO to Pinpoint Test G557182t12.

G557182t12 : CHECK THE VOLT DROP IN THE STARTER NEGATIVE CIRCUIT

1. Connect a voltmeter between:

Starter motor

Battery

Outer casing

Negative terminal

2. Key on, engine cranking.

Is the voltage greater than 0.5 volts?

-> Yes

CLEAN and tighten all battery cable connections, starter motor mounting and body to engine ground

strap. Test the system for normal operation. Check the resistance of the ground cables, replace as

necessary.

-> No

INSTALL a new starter motor.

Starter Motor - 4.2L NA V8 - AJV8/4.2L SC V8 - AJV8/3.0L NA V6 - AJ27/3.5L NA V8 - AJV8 (86.60.01)

Starter Motor - 2.7L V6 - TdV6 (86.60.01) Test the system for normal operation.

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