Lexus SC300 / Lexus SC400. Manual — part 657
DIAGNOSTIC CODE CHART (Cont’d)
TR–16
–
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
DIAGNOSTIC CODE CHART (Cont’d)
TR–18
–
ENGINE TROUBLESHOOTING
Diagnostic Code Chart
Trouble Area
”CHECK”
Engine Warning
Light *
Memory*
See Page
Trouble Area
Normal
Mode
Test
Mode
Memory
See Page
•
Open or short in air flow meter circuit.
•
Air flow meter
•
ECU
ON
N.A.
•
ECU
ON
ON
•
Open or short in throttle position sensor circuit.
•
Throttle position sensor
ON
ON
Throttle osition sensor
•
ECU
•
No. 1 speed sensor
•
Combination meter
•
Open or short in No. 1 speed sensor circuit.
•
ECU
ON
ON
•
Open or short in starter signal circuit.
•
Open or short in ignition switch or main relay circuit.
•
ECU
N.A.
OFF
X
•
Open or short in sub–throttle position sensor circuit.
•
Sub–throttle position sensor
OFF
ON
Sub throttle osition sensor
•
ECU
•
Open or short in No. 1 knock sensor circuit.
•
O en or short in No. 1 knock sensor circuit.
•
No. 1 knock sensor (looseness)
ON
N.A.
No. 1 knock sensor (looseness)
•
ECU
•
ECU
ON
N.A.
X
•
Open or short in No. 2 knock sensor circuit.
•
O en or short in No. 2 knock sensor circuit.
•
No. 2 knock sensor (looseness)
ON
N.A.
No. 2 knock sensor (looseness)
•
ECU
–
ENGINE TROUBLESHOOTING
Diagnostic Code Chart
TR–19
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