Module Communications Network Land Rover Range Rover Sport L320

SPECIFICATIONS

TORQUE SPECIFICATIONS

PRINCIPLES OF OPERATION

For a detailed description of the Communications Network, refer to the relevant Description and Operation.

INSPECTION AND VERIFICATION

Note. Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.

1. Verify the customer concern.
2. Visually inspect for obvious signs of damage and system integrity. VISUAL INSPECTION Electrical Fuses (refer to electrical guide) Wiring harness Correct engagement of electrical connectors Loose or corroded connections Routing of fibre optic harnesses Correct engagement of optical connectors Correct placement of optical connectors (ring order) Correct assembly of optical connectors (backout, etc.) Damage to fibre (chafing, abrasion, kinking, cuts, etc.)
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. If the cause is not visually evident, check for Diagnostic Trouble Codes (DTCs) and refer to the DTC Index.

SYMPTOM CHART

CONTROL MODULE CONNECTIONS TO THE CAN HARNESS

Control modules are connected to the CAN harness either in a 'loop' or 'spur' configuration. In the 'loop' type configuration the CAN harness loops into the module (via two connector pins) and then loops out of the module (via another two connector pins). In the 'spur' type configuration, a harness spur is spliced into the main 'backbone' of the CAN harness and the module is connected to the harness spur via two connector pins.

CAN HARNESS ARCHITECTURE

For a detailed description of the CAN Networks and architecture, refer to the relevant Description and Operation Workshop Information.

CAN NETWORK INTEGRITY TESTS

If a control module is suspected of non-communication, the Network Integrity test application available on the manufacturer approved diagnostic system can be used to confirm if communication is possible between the control modules on the vehicle and the manufacturer approved diagnostic system (via the J1962 diagnostic connector). The results from the test can be used to determine if either a single module or multiple modules are failing to communicate.

CAN TERMINATING MODULES

If the Network Integrity test indicates that one or more module on one of the CAN networks (HS or MS) are failing to communicate, there are several checks that can be made. The first step is to identify if both of the CAN terminating modules on each individual CAN Bus are communicating. If both CAN terminating modules for each individual CAN Bus are communicating (identified via the Network Integrity test), then it can be confirmed that the main 'backbone' of the CAN harness is complete. The main 'backbone' of the CAN harness consists of all the modules connected to the CAN harness via a 'loop' configuration and also includes the two terminating modules.

Communication with both CAN terminating modules via the Network Integrity test confirms the physical integrity of the main 'backbone' of the CAN harness (and the harness spur to the J1962 diagnostic connector). This means that there is no requirement to check the resistance of the CAN Network. This is because the standard check for 60 ohms across the CAN High and CAN Low lines will not provide any additional information regarding the physical condition of the CAN harness, beyond what has already been determined from the Network Integrity test.

NON-COMMUNICATION OF A TERMINATING MODULE

If a Network Integrity test reveals a terminating module is failing to communicate it can indicate a break in the main 'backbone' of the CAN harness. The first checks should always be to confirm the power and ground supplies to the non-communicating module are correct. Providing these are correct, the resistance between the CAN High and CAN Low lines at the J1962 connector can be checked to determine the integrity of the main 'backbone' of the CAN harness. After disconnecting the battery a reading of 120 ohms would indicate an open circuit in the main 'backbone' of the CAN harness. Alternatively, a reading of 60 ohms would indicate that there is no open circuit fault with the main 'backbone' of the CAN harness.

It is worth noting that even if one of the terminating modules is disconnected from the CAN harness, communications between the modules still connected may still be possible. Therefore communication between the manufacturer approved diagnostic system and the connected modules may also be possible.

LOCATING CAN HARNESS OPEN CIRCUITS

In the case where multiple modules, including a terminating module, are failing to communicate, having first confirmed the power and ground supplies are correct, the approximate location of the open circuit can be identified from analysis of the Network Integrity test results and reference to the relevant CAN network circuit diagrams. For example, if an open circuit existed in a certain position on the CAN harness, any module positioned on the Network between the J1962 connector and the open circuit should return a response during the Network Integrity test. No responses would be returned from any modules past the open circuit fault in the Network.

CAN HARNESS 'SPUR' TYPE CONFIGURATION CIRCUITS

If, after the initial checks (Network Integrity test using the manufacturer approved diagnostic system, and power and ground supplies to the module have been checked and confirmed as correct), a module that is connected to the CAN harness via a 'spur' type configuration is suspected of not communicating, then the physical integrity of the CAN harness 'spur' can be checked.

This is most easily undertaken by individually checking the continuity of the CAN High and CAN Low lines between the non-communicating module connector (with the module disconnected) and the J1962 diagnostic connector.

'LOST COMMUNICATIONS' DTCS

As well as the methods described so far in this document, which can be used to determine the location of an open circuit in the CAN harness, 'Lost Communications' DTCs can also be used for this purpose. Lost communication DTCs mean that a module is not receiving CAN information from another module.

For example, if a global DTC read were to be carried out, only DTCs stored in the modules that the manufacturer approved diagnostic system could communicate with would be displayed. If there was an open circuit fault in a certain position on the CAN harness, the modules that could display DTCs would all be prior to the open circuit on the Network, and these modules should display 'Lost Communications' DTCs with all the modules located on the Network past the open circuit fault.

'BUS OFF' DTCS

The references to bus and its condition refer to the network concerned and the modules on that network.

If a module logs a 'Bus Off' DTC, it means that the module has detected CAN transmission errors and has disabled it's own CAN transmissions and disconnected itself from the network in an attempt to allow the rest of the network to function. At this point the 'Bus Off' DTC is set. A common cause of 'Bus Off' DTCs can be a short circuit in the CAN network.

Scheme 1

Note. Items 1, 2 and 8 will always be present. The remaining items are optional and/or market specific.

OVERVIEW

The basic guidelines are covered in the description and operation information, such as not attempting to repair fibre optic cables, but additional precautions include

1. Do not touch the exposed ends of the optical fibres (grease from skin can contaminate the fibre)
2. Whenever the fibre optic cable is disconnected, cover the connectors to prevent dust contamination
3. Do not expose the fibre optic cable to heat
4. Do not bend the fibre optic cable through less than a 25 mm (one inch) radius
5. Do not use laser pens to test the fibre optic cable's ability to pass light

MOST DIAGNOSTIC TOOLS

There are two dedicated tools for testing the MOST system

Scheme 2

MOST tester. The MOST tester is connected to the MOST network in place of a control module. It will confirm receipt of any existing MOST signal and transmit it to the next control module on the network. Perform the following tests to validate the operation of the MOST tester. GO to PINPOINT TEST A .

Scheme 3

MOST prism: The MOST prism is connected in the same way as the MOST tester but will simply reflect any existing signal onward to the next control module. Using the MOST prism before or after a long run of harness may cause a ring break as a good signal may be too weak after travelling the extended distance. Also, the MOST prism will pass light in either direction so will not detect reversed MOST terminals elsewhere in the network. For these reasons, the MOST tester is the preferred tool and should be used unless limited access does not permit it

MOST RING BREAK INDICATION

A ring break in the MOST network is indicated by a loss of functionality and the touch screen will default to the logo screen. Possible causes of ring breaks are listed in the symptom chart.

PINPOINT TEST A: MOST TESTER TESTS

PINPOINT TEST B: MOST NETWORK INITIAL TESTS

PINPOINT TEST C: MOST NETWORK DOWNSTREAM TESTS

PINPOINT TEST D: MOST NETWORK UPSTREAM TESTS

PINPOINT TEST E: CONTROL MODULE TESTS

PINPOINT TEST F: MOST NETWORK FINAL UPSTREAM TESTS

PINPOINT TEST G: BLANK SCREEN TESTS

PINPOINT TEST H: AUDIO HEAD UNIT TESTS

DTC INDEX

For a list of Diagnostic Trouble Codes (DTCs) that could be logged on this vehicle, please refer to DIAGNOSTIC TROUBLE CODE (DTC) INDEX - DTC: CENTRAL JUNCTION BOX (CJB) .

REMOVAL

Note. Some variation in the illustrations may occur, but the essential information is always correct.

Note. Removal steps in this procedure may contain installation details.

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1. Refer to «BATTERY»(/land-rover/range-rover-sport/l320-2009-2013/remont/charging-system/#battery-mounting-and-cables) .
2. Refer to «AIR CLEANER LH»(/land-rover/range-rover-sport/l320-2009-2013/remont/mechanical/#intake-air-distribution-and-filtering-v8-50l-petrol) .
3. Refer to «AIR CLEANER RH»(/land-rover/range-rover-sport/l320-2009-2013/remont/mechanical/#intake-air-distribution-and-filtering-v8-50l-petrol) .
4. Remove the front LH road wheel and tire.
5. TORQUE: 10 Nm
6. TORQUE: 12 Nm
7. TORQUE: 10 Nm
8. TORQUE: 10 Nm
9. TORQUE: 10 Nm
10. TORQUE: 10 Nm
11. TORQUE: 10 Nm
12. Refer to «Brake Booster»(/land-rover/range-rover-sport/l320-2009-2013/remont/brakes-control-systems/#power-brake-actuation) .
13. TORQUE: 10 Nm
14. TORQUE: 10 Nm
15. Refer to «Instrument Panel»(/land-rover/range-rover-sport/l320-2009-2013/remont/gauges-instrument-panels/#instrument-panel-and-console) .
16. TORQUE: 10 Nm
17. TORQUE: 10 Nm

INSTALLATION

1. To install, reverse the removal procedure.

Note. The BJB is an integral component of the engine compartment wiring harness and cannot be removed separately.

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1. Disconnect the battery ground cable. Refer to «SPECIFICATIONS»(/land-rover/range-rover-sport/l320-2009-2013/remont/charging-system/#battery-charging-system-general-information) .
2. Make the SRS system safe. Refer to «STANDARD WORKSHOP PRACTICES»(/land-rover/range-rover-sport/l320-2009-2013/remont/oem-general-information/#general-information-1-of-2) .
3. Remove the engine cover. Refer to «ENGINE COVER - 2.7L DIESEL»(/land-rover/range-rover-sport/l320-2009-2013/remont/exteriorinterior-trim/#interior-trim-and-ornamentation) .
4. Remove the radiator grille. Refer to «RADIATOR GRILLE»(/land-rover/range-rover-sport/l320-2009-2013/remont/exteriorinterior-trim/#exterior-trim-and-ornamentation) .
5. Remove the air cleaner assembly.
6. Remove the four-wheel drive control module.
7. Remove the battery tray. Refer to «BATTERY TRAY»(/land-rover/range-rover-sport/l320-2009-2013/remont/charging-system/#battery-mounting-and-cables) .
8. Remove the auxiliary battery tray. Refer to «AUXILIARY BATTERY TRAY»(/land-rover/range-rover-sport/l320-2009-2013/remont/charging-system/#battery-mounting-and-cables) .
9. Remove the ECM cover. Disconnect 2 electrical connectors for access. Disconnect the 2 ECM electrical connectors. Remove the 4 Torx screws.
10. Remove the ECM. Remove the ECM top cover.
11. Remove the BJB cover. Release the clip.
12. Disconnect the battery positive cable from the BJB. Remove the nut.
13. Remove both cowl side trim panels. Refer to «COWL SIDE TRIM PANEL»(/land-rover/range-rover-sport/l320-2009-2013/remont/exteriorinterior-trim/#interior-trim-and-ornamentation) .
14. Remove the CJB. See «CENTRAL JUNCTION BOX (CJB)»(/land-rover/range-rover-sport/l320-2009-2013/remont/communication-devices/#module-communications-network) .
15. Release the CJB bracket. Release the 3 upper wiring harness clips. Remove the 2 bolts.
16. Remove the CJB bracket. Disconnect the 2 electrical connectors. Release the 3 lower wiring harness clips. Remove the 2 nuts.
17. Release the 2 ground cables from the lower A-pillar. Remove the nut.
18. Disconnect the heater motor electrical connector.
19. Release the BJB from the bracket. Remove the bolt.
20. Remove the battery ground cable. Remove the nut. Release the additional ground cable.
21. Release the BJB wiring harness from the bulkhead. Disconnect the 6 electrical connectors. Release the grommet.
22. Raise and support the vehicle.
23. Remove both front fender splash shields. Refer to «FENDER SPLASH SHIELD»(/land-rover/range-rover-sport/l320-2009-2013/remont/exterior-body-panels/#front-end-body-panels) .
24. Remove both headlamps. Refer to «HEADLAMP ASSEMBLY»(/land-rover/range-rover-sport/l320-2009-2013/remont/exterior-lights/#exterior-lighting) .
25. Passenger side: Disconnect the engine wiring harness electrical connector.
26. Passenger side: Disconnect the transfer case electrical connector.
27. LH side: Release the wiring harness from the fuel fired heater. Disconnect the 3 electrical connectors. Release the 3 clips.
28. LH side: Disconnect the washer jet hose.
29. LH side: Disconnect the adaptive front lighting module electrical connector.
30. LH side: Disconnect the 3 body panel electrical connectors.
31. LH side: Release the 3 body panel ground cables. Remove the nut.
32. LH side: Release the 2 air suspension pipes from the wiring harness. Release the 7 clips.
33. LH side: Disconnect the ABS electrical connector.
34. LH side: Release 3 engine compartment ground cables. Remove the 3 nuts. Release the 2 clips.
35. LH side: Release the washer reservoir wiring harness. Disconnect the 3 electrical connectors. Disconnect the 2 washer jet hoses.
36. LH side: Disconnect the coolant expansion tank level switch electrical connector.
37. LH side: Disconnect the brake pad wear sensor electrical connector.
38. LH side: Release the wiring harness. Release the grommet. Release the 4 clips.
39. Remove the windshield wiper motor. Refer to «WINDSHIELD WIPER MOTOR»(/land-rover/range-rover-sport/l320-2009-2013/remont/wiperwasher-systems/#wipers-and-washers) .
40. Remove the hood pad. Remove the 11 clips.
41. Release the hood wiring harness. Disconnect the 2 washer jet hoses. Disconnect the 2 electrical connectors. Release the 10 clips. Remove the wiring harness cover. Release the grommet.
42. Disconnect the A/C pressure transducer electrical connector.
43. Disconnect the battery to engine compartment wiring harness electrical connector.
44. Release the wiring harness from the plenum. Remove the 3 nuts. Release the clip.
45. Disconnect the brake fluid reservoir electrical connector.
46. Disconnect the ABS module electrical connector.
47. Remove the air suspension control module. Refer to «AIR SUSPENSION CONTROL MODULE»(/land-rover/range-rover-sport/l320-2009-2013/remont/electronic-suspension/#vehicle-dynamic-suspension) .
48. Driver side: Disconnect 2 electrical connectors from the lower A-pillar.
49. Driver side: Release the wiring harness from the bulkhead. Release the grommet.
50. RH side: Disconnect the 3 body panel electrical connectors.
51. RH side: Release the 3 body panel ground cables. Remove the nut.
52. RH side: Disconnect the ABS electrical connector.
53. RH side front: Release the air suspension pipe from the wiring harness clip.
54. RH side: Release 2 engine compartment ground cables. Remove the 2 nuts.
55. Disconnect the ambient air temperature sensor electrical connector.
56. Disconnect both front impact severity sensor electrical connectors. Release the 3 clips.
57. RH side: Release the wiring harness. Release the 9 clips.
58. Disconnect the hood switch electrical connector.
59. Disconnect both horn electrical connectors.
60. If installed, disconnect the speed control module electrical connector.
61. If installed, disconnect the pollution sensor electrical connector. Release the clip. Release the grommet.
62. Release the hood release cable. Release from the 3 clips.
63. Disconnect the front bumper wiring harness electrical connector.
64. With assistance, remove the BJB and wiring harness.

1. With assistance, install the BJB and wiring harness.
2. Connect the front bumper wiring harness electrical connector.
3. Attach the hood release cable. Secure with the clips.
4. If installed, connect the pollution sensor electrical connector. Install the grommet. Secure the clip.
5. If installed, connect the speed control module electrical connector.
6. Connect the horn electrical connectors.
7. Connect the hood switch electrical connector.
8. RH side: Secure the wiring harness. Secure the clips.
9. Connect both front impact electrical connectors. Secure the clips.
10. RH side: Attach the air suspension pipe.
11. Connect the ambient air temperature sensor electrical connector.
12. RH side: Attach the engine compartment ground cables. Tighten the nuts to 25 Nm (18 lb.ft).
13. RH side: Connect the ABS electrical connector.
14. RH side: Attach the body panel ground cables. Tighten the nut to 25 Nm (18 lb.ft).
15. RH side: Connect the body panel electrical connectors.
16. Driver side: Attach the wiring harness to the bulkhead. Install the grommet.
17. Driver side: Connect the lower A-pillar electrical connectors.
18. Install the air suspension control module. Refer to «AIR SUSPENSION CONTROL MODULE»(/land-rover/range-rover-sport/l320-2009-2013/remont/electronic-suspension/#vehicle-dynamic-suspension) .
19. Connect the ABS module electrical connector.
20. Connect the brake fluid reservoir electrical connector.
21. Attach the wiring harness to the plenum. Secure the clips. Tighten the nuts to 4 Nm (3 lb.ft).
22. Connect the battery to engine compartment wiring harness electrical connector.
23. Connect the A/C pressure transducer electrical connector.
24. Attach the hood wiring harness. Install the grommet. Install the cover. Secure with the clips. Connect the electrical connectors. Connect the washer jet hoses.
25. Install the hood pad. Install the clips.
26. Install the windshield wiper motor. Refer to «WINDSHIELD WIPER MOTOR»(/land-rover/range-rover-sport/l320-2009-2013/remont/wiperwasher-systems/#wipers-and-washers) .
27. LH side: Attach the wiring harness. Install the grommet. Secure the clips.
28. LH side: Connect the brake pad wear sensor electrical connector.
29. LH side: Connect the coolant expansion tank level switch electrical connector.
30. LH side: Attach the washer reservoir wiring harness. Connect the washer jet hoses. Connect the electrical connectors.
31. LH side: Attach the engine compartment ground cables. Secure the clips. Tighten the nuts to 25 Nm (18 lb.ft).
32. LH side: Connect the ABS electrical connector.
33. LH side: Attach the air suspension pipes. Secure the clips.
34. LH side: Attach the body panel ground cables. Tighten the nut to 25 Nm (18 lb.ft).
35. LH side: Connect the body panel electrical connectors.
36. LH side: Connect the adaptive front lighting module electrical connector.
37. LH side: Connect the washer jet hose.
38. LH side: Attach the wiring harness to the fuel fired heater. Connect the electrical connectors. Secure with the clips.
39. Passenger side: Connect the transfer case electrical connector.
40. Passenger side: Connect the engine wiring harness electrical connector.
41. Install the headlamps. Refer to «HEADLAMP ASSEMBLY»(/land-rover/range-rover-sport/l320-2009-2013/remont/exterior-lights/#exterior-lighting) .
42. Install the fender splash shields. Refer to «FENDER SPLASH SHIELD»(/land-rover/range-rover-sport/l320-2009-2013/remont/exterior-body-panels/#front-end-body-panels) .
43. Attach the BJB wiring harness to the bulkhead. Connect the electrical connectors. Install the grommet.
44. Install the battery ground cable. Attach the additional ground cable. Tighten the nut to 25 Nm (18 lb.ft).
45. Secure the BJB to the bracket. Tighten the bolt to 6 Nm (4 lb.ft).
46. Connect the heater motor electrical connector.
47. Connect the ground cables to the lower A-pillar. Tighten the nut to 10 Nm (7 lb.ft).
48. Install the CJB bracket. Tighten the nuts to 10 Nm (7 lb.ft). Secure the clips. Connect the electrical connectors. Tighten the bolts to 25 Nm (18 lb.ft).
49. Install the CJB. See «CENTRAL JUNCTION BOX (CJB)»(/land-rover/range-rover-sport/l320-2009-2013/remont/communication-devices/#module-communications-network) .
50. Connect the battery positive cable to the BJB. Tighten the nut to 25 Nm (18 lb.ft).
51. Install the BJB cover. Secure the clip.
52. Install the ECM. Install the ECM top cover.
53. Install the ECM cover. Tighten the Torx screws. Connect the electrical connectors.
54. Install the auxiliary battery tray. Refer to «AUXILIARY BATTERY TRAY»(/land-rover/range-rover-sport/l320-2009-2013/remont/charging-system/#battery-mounting-and-cables) .
55. Install the battery tray. Refer to «BATTERY TRAY»(/land-rover/range-rover-sport/l320-2009-2013/remont/charging-system/#battery-mounting-and-cables) .
56. Install the four-wheel drive control module.
57. Install the air cleaner assembly.
58. Install the radiator grille. Refer to «RADIATOR GRILLE»(/land-rover/range-rover-sport/l320-2009-2013/remont/exteriorinterior-trim/#exterior-trim-and-ornamentation) .
59. Install the engine cover. Refer to «ENGINE COVER - 2.7L DIESEL»(/land-rover/range-rover-sport/l320-2009-2013/remont/exteriorinterior-trim/#interior-trim-and-ornamentation) .
60. Connect the battery ground cable. Refer to «SPECIFICATIONS»(/land-rover/range-rover-sport/l320-2009-2013/remont/charging-system/#battery-charging-system-general-information) .

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1. If the central junction box (CJB) is to be replaced, connect T4 to the vehicle.
2. Remove the glove compartment. Refer to «GLOVE COMPARTMENT»(/land-rover/range-rover-sport/l320-2009-2013/remont/gauges-instrument-panels/#instrument-panel-and-console) .
3. Remove the passenger side closing trim panel. Release the clip. Remove the 2 screws. Disconnect the electrical connector.
4. Remove the CJB. Remove the 2 nuts. Disconnect the 6 electrical connectors.

1. Install the CJB. Connect the electrical connectors. Tighten the nuts to 10 Nm (7 lb.ft).
2. Install the closing trim panel. Connect the electrical connector. Secure the clip.
3. Install the glove compartment. Refer to «GLOVE COMPARTMENT»(/land-rover/range-rover-sport/l320-2009-2013/remont/gauges-instrument-panels/#instrument-panel-and-console) .
4. Initiate a new CJB using T4.

See also:
• DIAGNOSTIC TROUBLE CODE (DTC) INDEX - DTC: CENTRAL JUNCTION BOX (CJB)
• BATTERY
• AIR CLEANER LH
• Brake Booster
• Instrument Panel
• SPECIFICATIONS
• ENGINE COVER - 2.7L DIESEL
• RADIATOR GRILLE
• FENDER SPLASH SHIELD
• HEADLAMP ASSEMBLY
• WINDSHIELD WIPER MOTOR
• AIR SUSPENSION CONTROL MODULE
• PINPOINT TEST B
• PINPOINT TEST G
• PINPOINT TEST A
• PINPOINT TEST C
• PINPOINT TEST D
• PINPOINT TEST H
• PINPOINT TEST F
• PINPOINT TEST E
• CENTRAL JUNCTION BOX (CJB)