Lexus RX300 (MCU15). Manual — part 372
DI–718
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
LEXUS RX300 (RM785E)
DTC
B1261 / 61
Engine & ECT ECU communication
stop
CIRCUIT DESCRIPTION
This DTC is output when communication stops between engine & ECT ECU and Body ECU.
DTC No.
DTC Detecting Condition
Trouble Area
B1261/61
No communication from engine & ECT ECU more than 10
S Engine & ECT ECU
B1261/61
No communication from engine & ECT ECU more than 10
seconds.
Engine & ECT ECU
S Wireharness
WIRING DIAGRAM
See page DI–688
INSPECTION PROCEDURE
1
Check engine & ECT ECU.
CHECK:
Check that the engine starts normally.
HINT:
With this inspection, engine & ECT ECU CPU can be diagnosed if it works normally or not.
NG
Replace the engine & ECT ECU.
OK
DI2BB–07
I07400
Body ECU
B5
MPX1
Engine & ECT ECU
E8
MPX2
MPX2
E8
MPX1
Passenger
Door ECU
Engine & ECT ECU
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
DI–719
LEXUS RX300 (RM785E)
2
Check wireharness
PREPARATION:
Disconnect connector ”B5” of body ECU, ”E8” of engine & ECT
ECU and passenger door ECU.
CHECK:
(a)
Check continuity between terminals MPX1 of body No.1
ECU and MPX2 of engine & ECT ECU.
(b)
Check continuity between terminals MPX2 of engine &
ECT ECU and MPX1 of passenger door ECU.
OK:
There is a continuity in wireharness of both (a) and (b), or either
(a) or (b).
HINT:
If there is OPEN in wireharness of either (a) or (b), please repair
it.
NG
Repair or replace wireharness.
OK
Replace the engine & ECT ECU.
DI–720
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
LEXUS RX300 (RM785E)
DTC
B1269 / 69
Theft deterrent ECU communication
stop
CIRCUIT DESCRIPTION
This DTC is output when communication stops between theft deterrent ECU and body ECU.
DTC No.
DTC Detecting Condition
Trouble Area
B1269/69
No communication from theft deterrent ECU more than 10
S Theft deterrent ECU
B1269/69
No communication from theft deterrent ECU more than 10
seconds.
Theft deterrent ECU
S Wireharness
WIRING DIAGRAM
See page DI–693.
INSPECTION PROCEDURE
1
Check theft deterrent ECU.
CHECK:
Check that the operation of the theft deterrent function is normal.
HINT:
With this inspection, the theft deterrent ECU CPU can be diagnosed if it works normally or not.
NG
Replace the theft deterrent ECU.
OK
DI63C–03
I19227
Theft Deterrent ECU
MPX2
MPX1
MPX1
MPX–
Theft Deterrent ECU
Driver Door ECU
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
DI–721
LEXUS RX300 (RM785E)
2
Check wireharness
PREPARATION:
Disconnect connector of driver door ECU, ”C11” of A/C and
combination meter integrated ECU and ”T5” of theft deterrent
ECU.
CHECK:
(a)
Check continuity between terminals MPX1 of driver door
ECU and MPX2 of theft deterrent ECU.
(b)
Check continuity between terminals MPX1 of theft deter-
rent ECU and MPX– of A/C and combination meter inte-
grated ECU.
OK:
There is a continuity in wireharness of both (a) and (b), or either
(a) or (b).
HINT:
If there is OPEN in wireharness of either (a) or (b), please repair
it.
NG
Repair or replace wireharness.
OK
Replace the theft deterrent ECU.
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