Lexus RX300 (MCU15). Service manual — part 226
DI–136
–
DIAGNOSTICS
ENGINE
LEXUS RX300 (RM785E)
NG
2
Check for open in harness and connector between engine ECU and starter relay
(See page IN–32).
NG
Repair or replace harness or connector.
OK
Check and replace engine ECU
(See page IN–32).
A14524
Check Engine
Warning Light
Engine ECU
Instrument Panel J/B
W
Battery
E9
6
IG1
C12
C10
HEATER
Y–G
1
F11
8
J/B No. 3
Ignition Switch
19
2
13
B–Y
7
1
1
ALT
AM1
R–W
4
FL Block
3A
3E
1A
6
5
AM1
W–L
IE2
Y–G
W
1C
1C
1K
R–W
I15
–
DIAGNOSTICS
ENGINE
DI–137
LEXUS RX300 (RM785E)
Check Engine Warning Light Circuit Malfunction
CIRCUIT DESCRIPTION
If the engine ECU detects trouble, the check engine warning lights up. At this time, the engine ECU records
a DTC in memory.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Troubleshoot in accordance with the chart below for each trouble symptom.
Check engine does not light up
Start inspection from step 1 in case of using hand–held tester and
start from step 2 in case of not using hand–held tester
Check engine remains on
After inspection of step 3, start inspection from step 4 in case of
using hand–held tester and start from step 5 in case of not using
hand–held tester
DI6QO–07
DI–138
–
DIAGNOSTICS
ENGINE
LEXUS RX300 (RM785E)
1
Check operation of check engine warning light.
PREPARATION:
(a)
Connect the hand–held tester to the DLC3.
(b)
Turn the ignition switch ON and push the hand–held tester main switch ON.
(c)
Switch the hand–held tester from the normal mode to the check mode.
CHECK:
Check if the check engine warning light blinks.
OK:
The check engine warning light blinks.
OK
Check and replace engine ECU (See page
IN–32).
NG
2
Check check engine warning light.
See combination meter troubleshooting (See page BE–2).
NG
Repair or replace bulb or combination meter as-
sembly.
OK
3
Check that engine ECU connectors are securely connected to engine ECU.
NO
Connect connector to engine ECU.
YES
Check for open circuit in harness and connector between combination meter and engine ECU
(See page IN–32).
–
DIAGNOSTICS
ENGINE
DI–139
LEXUS RX300 (RM785E)
4
Check operation of check engine warning light (See step 1).
OK
Check and replace engine ECU (See page
IN–32).
NG
5
Is DTC output?
Check DTC on page DI–3.
YES
Repair circuit indicated by output code.
NO
6
Check HEATER fuse.
OK
Check for short in all harness and components
connected to HEATER fuse.
NG
Check for short circuit in harness and connector between DLC3 and engine ECU (See page
IN–32).
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