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
MP–10
MULTIPLEX COMMUNICATION – MULTIPLEX COMMUNICATION SYSTEM
MP
•
If communication is still not possible when the
tester is connected to another vehicle, the
problem may be in the tester itself. Consult the
Service Department listed in the tester's
instruction manual.
3.
INSPECT BATTERY VOLTAGE
Standard voltage:
11 to 14 V
If the voltage is below 11 V, recharge or replace the
battery before proceeding.
DTC CHECK / CLEAR
1.
CHECK DTC
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch ON.
(c) Enter the following menus: DIAGNOSIS/OBD/
MOBD/BODY/DTC INFO.
(d) Check the DTCs on the tester screen.
HINT:
Refer to the intelligent tester operator's manual for
further details.
2.
CLEAR DTC
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch ON.
(c) Erase the DTCs by following the prompts on the
tester screen.
(d) Enter the following menus: DIAGNOSIS/OBD/
MOBD/BODY/DTC INFO.
HINT:
Refer to the intelligent tester operator's manual for
further details.
Intelligent Tester
DLC3
CAN VIM
H102157E03
MULTIPLEX COMMUNICATION – MULTIPLEX COMMUNICATION SYSTEM
MP–11
MP
DIAGNOSTIC TROUBLE CODE CHART
HINT:
If a malfunction code is displayed during the DTC check,
check the circuit corresponding to the code in the table below.
Proceed to the page given for the circuit.
MULTIPLEX COMMUNICATION SYSTEM
DTC No.
Detection Item
Trouble area
See page
B1214
Short to B+ in Door System
Communication Bus Malfunction
1. Back door ECU
2. Main Body ECU
3. Wire Harness
B1215
Short to GND in Door System
Communication Bus Malfunction
1. Back door ECU
2. Main Body ECU
3. Wire Harness
B1287
Back Door ECU Communication
Stop
1. Back door ECU
2. Wire Harness
MP–12
MULTIPLEX COMMUNICATION – MULTIPLEX COMMUNICATION SYSTEM
MP
DESCRIPTION
When a +B short circuit or body ground short circuit is detected on the communication bus (BEAN), BEAN
is disabled and a DTC is output.
WIRING DIAGRAM
INSPECTION PROCEDURE
(a) Disconnect the back door ECU connector and check for
DTCs B1214 and B1215.
DTC
B1214
Short to B+ in Door System Communication
Bus Malfunction
DTC
B1215
Short to GND in Door System Communication
Bus Malfunction
DTC No.
DTC Detection Condition
Trouble Area
B1214
Communication circuit and +B battery system short
•
Back door ECU
•
Main body ECU
•
Wire harness
B1215
Door system communication circuit and body ground
short
•
Back door ECU
•
Main body ECU
•
Wire harness
1
CHECK DIAGNOSTIC TROUBLE CODE (BACK DOOR ECU)
Main Body ECU
Back Door ECU
MPX2
MPX2
B137556E01
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