Lexus SC300 / Lexus SC400. Manual — part 847
DIAGNOSTIC CODE CHART
HINT: Parameters listed in the chart may not be exactly same as your reading due to type of the instruments
or other factors.
*4: See page
TR–14
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ENGINE TROUBLESHOOTING
Diagnostic Code Chart
If a malfunction code is displayed during the diagnostic code check in test mode, check the circuit for that code
listed in the table below (Proceed to the page given for that circuit).
Tro ble Area
”CHECK” Engine
Warning Light *
Memory*
See Page
Trouble Area
Normal
Mode
Test
Mode
–––––––––––––
–––
–––
–––––
–––––
•
Open or short in engine speed sensor, No. 1, No. 2
cam position sensor circuit.
•
Engine speed sensor
•
No. 1, No. 2 cam position sensor
•
Starter
•
ECU
ON
N.A.
•
Open or short in engine speed sensor circuit.
•
O en or short in engine s eed sensor circuit.
•
Engine speed sensor
ON
N.A.
Engine s eed sensor
•
ECU
ON
N.A.
•
Open or short in engine speed sensor circuit.
g
•
Mechanical system malfunction (skipping teeth of
ti i
timing
•
belt belt stretched)
N.A.
ON
•
belt, belt stretched)
•
Engine speed sensor
•
Engine s eed sensor
•
ECU
•
Mechanical system malfunction (skipping teeth of
•
Mechanical system malfunction (ski
ing teeth of
•
timing belt, belt stretched)
ON
N A
•
timing belt, belt stretched)
•
No. 1, No. 2 cam position sensor
ON
N.A.
No. 1, No. 2 cam osition sensor
•
ECU
•
Open or short in IGF1 circuit from igniter No.
1–ECU.
•
Igniter No. 1
•
ECU
ON
N.A.
•
Open or short in IGF2 circuit from igniter No.
2–ECU.
•
Igniter No. 2
•
ECU
ON
N.A.
•
ECU
ON
N.A.
X
•
Open or short in heater circuit of main oxygen sen-
sor.
•
Main oxygen sensor heater
ON
N.A.
•
Main oxygen sensor heater
•
ECU
•
Main oxygen sensor circuit
•
Main oxygen sensor
ON
ON
•
Main oxygen sensor
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ENGINE TROUBLESHOOTING
Diagnostic Code Chart
TR–15
DIAGNOSTIC CODE CHART (Cont’d)
TR–16
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ENGINE TROUBLESHOOTING
Diagnostic Code Chart
”CHECK” Engine
Tro ble Area
CHECK Engine
Warning Light *
Memory*
See Page
Trouble Area
Normal
Mode
Test
Mode
Memory*
See Page
•
Open or short in water temp. sensor circuit.
•
Water temp. sensor
•
ECU
ON
ON
•
Open or short in intake air temp sensor circuit
OFF
•
Open or short in intake air temp. sensor circuit.
•
Intake air temp sensor
OFF
ON
•
Intake air temp. sensor
ECU
ON*3
ON
•
ECU
ON*3
•
Open or short in main oxygen sensor circuit.
•
O en or short in main oxygen sensor circuit.
•
Main oxygen sensor
Main oxygen sensor
•
Ignition system
g
y
•
Water temp. sensor
•
Open or short in injector circuit.
•
O en or short in injector circuit.
•
Fuel line pressure (injector blockage)
•
Fuel line ressure (injector blockage)
•
Air flow meter (air intake)
ON
ON
Air flow meter (air intake)
•
Engine ground bolt loose
g
g
•
Foreign object caught in valve
•
Fuel line pressure (injector leak, blockage)
•
Fuel line ressure (injector leak, blockage)
•
Mechanical system malfunction
Mechanical system malfunction
•
(skipping teeth of timing belt)
(
g
g
)
•
Ignition system
•
Open or short in heater circuit of sub–oxygen sen-
sor.
•
Sub–oxygen sensor heater
ON
N.A.
•
Sub–oxygen sensor heater.
•
ECU
•
Open or short in sub–oxygen sensor circuit.
•
O en or short in sub oxygen sensor circuit.
•
Sub–oxygen sensor
ON
ON
Sub oxygen sensor
•
ECU
•
Same as (1) of Code No. 21
ON
N.A.
•
Same as (2) of Code No. 21
ON
ON
•
Same as (1) of Code No. 27
ON
N.A.
•
Same as (2) of Code No. 27
ON
ON
*1, 2, 3: See page
.
–
ENGINE TROUBLESHOOTING
Diagnostic Code Chart
TR–17
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