ESP RENAULT SCENIC 2006 J84 / 2.G Electrical Equipment - Multiplexing Workshop Manual

MULTIPLEXING
Fault finding - Introduction
88B
88B-3
COMPUTERS
–Valid: green outline, green lettering.
–Undetected: red outline, red lettering.
–Undiagnosable: black outline, black lettering.
–Unknown: red outline, red lettering + exclamation mark.
PISTON RINGS
–Valid: green dash.
–Faulty: red dash.
–Undiagnosed: black dash.
INTERPRETING TEST RESULT CHARTS
On the Problems tab, the computers are organised into the following groups:
–Undetected if the computer failed to respond to the tool's identification request.
–Within the undetected category, the computers are subdivided into Stores multiplex network
configuration and Does not store multiplex network configuration".
–Unknown if the computer is detected but cannot be identified from its response.
On the Information tab, the computers are organised and listed as follows:
–Undiagnosable if the computer cannot be diagnosed with the tool and therefore was not queried.
–Valid if the computer responded correctly to the tool's query.
Clicking on the continue icon in the lower right-hand corner displays a new screen with the following tab:
On the Results tab, the computers are organised into the following groups:
–Faulty if the computer is known and has a non-zero number of faults.
–OK if the computer was detected, recognised and has no faults.
–Unknown if the computer was detected but could not be identified from its response.
–Undetected if the computer can be diagnosed but failed to respond.
FUNCTION TESTING
The vehicle function tests screen resembles the multiplex network test screen in showing a diagram of the network
architecture if this is known and displayed.
The Function tab, displays the various computers involved in the functions whether distributed or not distributed
over the different computers.
The Info tab displays the other possible functions found on the vehicle concerned.
Selecting a function from the list greys out the computers on the diagram that are not involved in that function.
The Diagnostics button runs diagnostics on the function selected from the list.

MULTIPLEXING
Fault finding - Configuration
88B
88B-5
MULTIPLEX NETWORK GENERIC ARCHITECTURE
Number of multiplex network segments between computers:
* A vehicle can have either LPG or automatic transmission, but never both.
** The vehicle either has just ABS or ABS + ESP (electronic stability program). 120 Injection
118 ABS **
1094 ABS+ESP **
1337 Switching Protection Unit
119 Automatic transmission *
997 LPG / GNV *
1088 Steering lock
1232 Electric power-assisted steering
247 Instrument panel
645 UCH 419 Air conditioning
1125 Control and Communications Unit
469 Driving School Unit
756 Airbag
1217 Automatic parking brake
989 Discharge bulbs
1222 Parking assistance

MULTIPLEXING
Diagnostics - Dealing with faults
88B
88B-10
MULTIPLEX NETWORK OUT OF ORDER
Help finding network short circuits
NOTESGet a copy of the multiplex network wiring diagram for the vehicle and the diagnostic
socket diagram.
In the event of a short-circuit to + battery, leave the battery connected.
The test procedure involves disconnecting the various network components in sequence to pinpoint the faulty
one.
Check the condition of the connectors.
Check the condition of the multiplex network wires (CAN H - CAN L).
Repair the damaged components.
Systematically repeat the multiplex network test after each operation to see if the fault has been resolved. If
the fault is still shown as present, continue disconnecting the connectors and computers one by one.
Input Output
Connector Can H Can L Connector Can H Can L
Protection and Switching Unit Siemens PEH blue 10 8 PEH blue 11/12 7/9
K4J injection S 3000 C 2AN A black A4 A3
K4M - F4R injection S 3000 C 2AN A black A4 A3 2AN B brown K4 K3
K9K injection LVCR 2AN A black A4 A3
F9Q injection EDC 16 C Black A4 A3
Automatic transmission DP0 Black 38 39
ABS - ESP Black 35 14
ABS Black 26 15
Electric power-assisted steering TRW Black 7 5 Black 6
4
Airbag Black 11 10
Climate control Black 7 1
Steering lock Black 3 6
UCH PE 2 black 6 16 10/8 20/18
Instrument panelGrey
30 29 Red 2 3
Driving school unitBlack
A3 B3
Central communications unit Green 6 7 Grey 3 4
Automatic parking brake Grey A3 A2
R 2 Grey 2 3
R 369White
12 13
OBD (On Board Diagnostic)Black
614
If the fault is not visible, contact your Techline.
AFTER REPAIRCarry out a new multiplex network test with the diagnostic tool.
Clear the stored faults on all the computers connected to the network.
Deal with any other possible faults.

MULTIPLEXING
Fault finding - Fault finding chart
88B
88B-12
CHART 2Topology diagram not displayed during multiplex network test
NOTES
The topology cannot be displayed under the following conditions:
–The two computers storing the multiplex network configuration failed to respond.
–The multiplex network is out of order; therefore communication is impossible.
–On the Multiplex network tab on the configuration screen, a wrong Network version number has been
entered into one of the two computers that store the network configuration.
–No Network version has been entered into the two computers that store the configuration.

MULTIPLEXING
Diagnostics - Repair assistance
88B
88B-14
Diagnostics - Repair assistance
CHANGES IN SCENIC II DIAGNOSTICS
●Assistance with computer or faulty segment detection:
If the multiplex network is completely frozen, this command can isolate multiplex network segments and thereby
rule out those that respond properly to the tool. This makes it easier to pinpoint the origin of the failure.
The algorithm for help with locating faults is intended for dealing with electrical faults present solely in CAN; it is
therefore essential that connectors and computers not attached to the bus are not taken into consideration.
●A test for multiplex network faults by using physical measurements:
When a multiplex network segment has a short circuit, the computers can no longer communicate with each other
nor with the diagnostic tool. At this point, the network test is out of order.
The CLIP tool can identify several types of faults by taking electrical measurements on the CAN H and CAN L
multiplex network. It can detect a CAN L / CAN H short circuit, a CAN L / + 12 V short circuit, a CAN H / + 12 V short
circuit, and a CAN H / earth short circuit.
Then, by disconnecting the connectors and computers in the order described under the "Help with detecting
segments - computers" heading, the actual or possible segment causing the multiplex network fault can be
identified.
●Disconnecting connectors and computers:
⇒ Help with locating network faults screen
In keeping with the diagnostic tool algorithm and based on the results obtained as it unfolds, the order for
disconnecting connectors and computers recommended by the diagnostic tool will probably be as follows:
Injection, ABS, Protection and Switching Unit, automatic transmission, LPG, steering lock, electric power-
assisted steering, instrument panel, UCH, heating and ventilation system, Control and Communications
Unit, R369 Union, Driving School Unit, airbag, R2 Union, automatic parking brake.
NOTE:
The tool sometimes requests that computers not present in the vehicle concerned be disconnected; in this case,
make sure that the computer in question is not installed, and confirm as though the component concerned had been
disconnected and reconnected and continue the test.
Network physical measurements screen
With the second screen, the operator can check the status of the multiplex network after each disconnection /
reconnection procedure involving the selected connector or computer. This enables the operator to check the status
of the multiplex network after disconnecting each component.