Toyota FJ Cruiser (GSJ 10, 15 series). Instruction - part 342
MULTIPLEX COMMUNICATION – MULTIPLEX COMMUNICATION SYSTEM
MP–9
MP
DIAGNOSIS SYSTEM
1.
DESCRIPTION
(a) The main body ECU controls the functions of the
multiplex communication system on the vehicle.
Data of the multiplex communication system and
the Diagnostic Trouble Codes (DTC) can be read
through the Data Link Connector 3 (DLC3) of the
vehicle.
2.
CHECK DLC3
(a) The ECU uses ISO 15765-4 for communication.
The terminal arrangement of the DLC3 complies
with ISO 15031-3 and matches the ISO 15765-4
format.
CAUTION:
*: Before measuring the resistance, leave the
vehicle as is for at least 1 minute and do not
operate the ignition switch, any other switches
or the doors.
If the result is not as specified, the DLC3 may have
a malfunction. Repair or replace the harness and
connector.
(b) Intelligent tester
HINT:
Connect the cable of the intelligent tester to the
CAN VIM, connect the CAN VIM to the DLC3, turn
the ignition switch ON and attempt to use the tester.
If the display indicates that a communication error
has occurred, there is a problem either with the
vehicle or with the tester.
• If communication is normal when the tester is
connected to another vehicle, inspect the DLC3
of the original vehicle.
CG SG
BAT
SIL
CANH
CANL
H100769E16
Symbols (Terminal No.)
Terminal Description
Condition
Specified Condition
SIL (7) - SG (5)
Bus "+" line
During transmission
Pulse generation
CG (4) - Body ground
Chassis ground
Always
Below 1
Ω
SG (5) - Body ground
Signal ground
Always
Below 1
Ω
BAT (16) - Body ground
Battery positive
Always
11 to 14 V
CANH (6) - CANL (14)
HIGH-level CAN bus line
Ignition switch OFF*
54 to 69
Ω
CANH (6) - CG (4)
HIGH-level CAN bus line
Ignition switch OFF*
200
Ω or more
CANL (14) - CG (4)
LOW-level CAN bus line
Ignition switch OFF*
200
Ω or more
CANH (6) - BAT (16)
HIGH-level CAN bus line
Ignition switch OFF*
6 k
Ω or more
CANL (14) - BAT (16)
LOW-level CAN bus line
Ignition switch OFF*
6 k
Ω or more
Intelligent Tester
DLC3
CAN VIM
H102157E03