Geely Emgrand X7. Manual part — 652

2. Install standby power supply.

3. Install auxiliary instrument panel

ashtray panel.

4. Connect the battery negative

cable.

NL11-0118b

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11.16 Data communication system

11.16.1 Specifications

11.16.1.1 Fastener specifications

Torque Range

Fastener Name

Model

Metric (N·m)

English system

(lb-ft)

Fixing Bolts of ECM

M6×16

8-10

6-8

Fixing Bolts of ABS

M8×20

15-21

11.1-15.5

ACU Braket Retaining nuts

M6×20

8-10

6-8

BCM Bracket Retaining nuts

M6×16

8

6

Instrument Assembly

Self-Tapping Screws

ST4 . 8×16

4-6

3-4.4

Fixing bolt of air-conditioning

head unit assembly

M6×12 6-7 4.4-5.2

Fixing nut of air-conditioning

head unit assembly

M6 6-7 4.4-5.2

IMMO support fixing bolt

M6×16

7-9

5.2-6.7

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11.16.2 Description and operation

11.16.2.1 System work principle (without CAN)

Overview

This vehicle uses three types of data communication:

– K-LINE

– LIN

LIN Bus Description

–

LIN is a new type of low-cost serial communication system used for automotive distributed
electronic control system, mainly applied for the serial communication of intelligence sensors
and actuators.

–

LIN bus features:

Contrastive rhetoric and discourse is base on the UART data format

Single wire transmission: 0-12 V

Communication speed: 19.2 kbps

K Bus Description

–

K bus is for the diagnostic communication between the vehicle-mounted ECM and the
external test equipment. Transfer rate is 10.47 kbps. Voltage is switched between 0 V and 12
V: 12 V, logic "1"; 0 V, logic "0".

Datalink connector description

Datalink connector (DLC) is the result of consultation and regulations between the international
automotive manufacturers. The connector must be used when using a fault diagnosis tester to
communicate with the vehicle and make a program for all vehicle communication systems.

The connector must meet the following conditions:

–

It can connect the 16-pin connector of all fault diagnosis testers.

–

Always use No.16-pin to provide power of battery for the fault diagnosis tester.

–

Always use No.4-pin to provide earthing point for the fault diagnosis tester.

–

The rest pins are designed for vehicle serial data communications. The modules controlled by
a microprocessor of the vehicle communicate with each other and between the fault diagnosis
testers by the serial data circuit.

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11.16.2.2 System work principle (with CAN)

Overview

This vehicle uses three types of data communication:

– CAN

– K-LINE

– LIN

CAN Bus Description

–

CAN is the acronym for Controller Area Network, standing for Controller Area Network bus,
meaning that the control devices are connected to each other to exchange data. CAN bus
communication medium is a twisted-pair, in which the communication speed of high-speed
CAN bus is 500 kbps. Twisted-pair terminals are two 120 Ω resistors, one end is in the
engine control module (ECM), the other side is in the body control module (BCM).
High-speed CAN bus is a differential bus. High-speed CAN bus serial data bus (H) and
high-speed CAN bus serial data bus (L) are driven from a stationary or idle-level to the
opposite limit. About 2.5 V idle levels is considered to be recessive transmission of data and
interpreted as logic 1. When the circuit is driven to the limit, high- speed CAN bus serial data
bus (H) would increase by 1V and the high-speed CAN bus serial data bus (L) will reduce by
1 V. Limiting voltage difference 2 V is considered to be dominant transmission of data and is
interpreted as logic 0 (as shown by the following diagram).

1

0

3.5v

2.5v

1.5v

FE11-1504b

–

If the communication signal is lost, the program will target the control module settings losing
communication fault diagnosis codes. The fault diagnosis codes can be read by a fault
diagnosis tester.

Notes:

Serial data loosing the fault diagnosis codes does not mean that the module which sets the fault
diagnosis codes is out of order.

–

The advantages of CAN bus:

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